diff --git a/build/files.js b/build/files.js
index 96d5210947..49f50ad12e 100644
--- a/build/files.js
+++ b/build/files.js
@@ -220,6 +220,25 @@ function CorkedRequest(state) {
           /const \{ once \} = require\('internal\/util'\);/
       ,  'function once(callback) { let called = false; return function(...args) { if (called) return; called = true; callback(...args); }; }'
   ]
+  , nextTickUsage = [
+          /process\.nextTick\((.+?)\)/g
+      ,   'nextTick($1)'
+  ]
+  , nextTickDeclaration = function(prefix = './') { return [
+          /^('use strict';)$/m
+      ,   `$1\n\nvar nextTick = require('${prefix}next-tick');\n`
+  ]}
+  , isStdStreamCheck = [
+          /dest !== process\.(stdout|stderr)/g
+      ,   `!isStdStream(dest, '$1')`
+  ]
+  , isStdStreamDeclaration = [
+          /$/
+      ,   `
+function isStdStream(stream, type) {
+  return typeof process === 'undefined' ? false : stream === process[type];
+}`
+  ]
 
 module.exports['_stream_duplex.js'] = [
     requireReplacement
@@ -230,6 +249,8 @@ module.exports['_stream_duplex.js'] = [
   , objectKeysReplacement
   , objectKeysDefine
   , errorsOneLevel
+  , nextTickDeclaration('./internal/streams/')
+  , nextTickUsage
 ]
 
 module.exports['_stream_passthrough.js'] = [
@@ -266,7 +287,11 @@ module.exports['_stream_readable.js'] = [
   , noAsyncIterators1
   , noAsyncIterators2
   , noAsyncIteratorsFrom1
-  , noAsyncIteratorsFrom2
+  , noAsyncIteratorsFrom2,
+  , nextTickDeclaration('./internal/streams/')
+  , nextTickUsage
+  , isStdStreamCheck
+  , isStdStreamDeclaration
 ]
 
 module.exports['_stream_transform.js'] = [
@@ -305,6 +330,8 @@ module.exports['_stream_writable.js'] = [
   , useCorkedRequest
   , addConstructors
   , errorsOneLevel
+  , nextTickDeclaration('./internal/streams/')
+  , nextTickUsage
 ]
 
 module.exports['internal/streams/buffer_list.js'] = [
@@ -315,13 +342,15 @@ module.exports['internal/streams/buffer_list.js'] = [
     [
       /const \{ inspect \} = require\('util'\);/,
       `
-const { inspect } = require('util')
+const inspect = require('./inspect')
 const custom = inspect && inspect.custom || 'inspect'
       `
     ]
 ]
 module.exports['internal/streams/destroy.js'] = [
-    errorsTwoLevel
+      errorsTwoLevel,
+    , nextTickDeclaration()
+    , nextTickUsage
 ]
 
 module.exports['internal/streams/state.js'] = [
@@ -343,6 +372,8 @@ module.exports['internal/streams/async_iterator.js'] = [
       /  return\(\)/,
       '[Symbol.asyncIterator]() { return this },\n  return\(\)'
     ]
+  , nextTickDeclaration()
+  , nextTickUsage
 ]
 
 module.exports['internal/streams/end-of-stream.js'] = [
diff --git a/lib/_stream_duplex.js b/lib/_stream_duplex.js
index 6752519225..88b80d299c 100644
--- a/lib/_stream_duplex.js
+++ b/lib/_stream_duplex.js
@@ -23,8 +23,11 @@
 // prototypally inherits from Readable, and then parasitically from
 // Writable.
 'use strict';
+
+var nextTick = require('./internal/streams/next-tick');
 /*<replacement>*/
 
+
 var objectKeys = Object.keys || function (obj) {
   var keys = [];
 
@@ -105,7 +108,7 @@ function onend() {
   if (this._writableState.ended) return; // no more data can be written.
   // But allow more writes to happen in this tick.
 
-  process.nextTick(onEndNT, this);
+  nextTick(onEndNT, this);
 }
 
 function onEndNT(self) {
diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index 192d451488..88f241c740 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -20,6 +20,8 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 'use strict';
 
+var nextTick = require('./internal/streams/next-tick');
+
 module.exports = Readable;
 /*<replacement>*/
 
@@ -526,7 +528,7 @@ function emitReadable(stream) {
   if (!state.emittedReadable) {
     debug('emitReadable', state.flowing);
     state.emittedReadable = true;
-    process.nextTick(emitReadable_, stream);
+    nextTick(emitReadable_, stream);
   }
 }
 
@@ -558,7 +560,7 @@ function emitReadable_(stream) {
 function maybeReadMore(stream, state) {
   if (!state.readingMore) {
     state.readingMore = true;
-    process.nextTick(maybeReadMore_, stream, state);
+    nextTick(maybeReadMore_, stream, state);
   }
 }
 
@@ -625,9 +627,9 @@ Readable.prototype.pipe = function (dest, pipeOpts) {
 
   state.pipesCount += 1;
   debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
+  var doEnd = (!pipeOpts || pipeOpts.end !== false) && !isStdStream(dest, 'stdout') && !isStdStream(dest, 'stderr');
   var endFn = doEnd ? onend : unpipe;
-  if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);
+  if (state.endEmitted) nextTick(endFn);else src.once('end', endFn);
   dest.on('unpipe', onunpipe);
 
   function onunpipe(readable, unpipeInfo) {
@@ -821,7 +823,7 @@ Readable.prototype.on = function (ev, fn) {
       if (state.length) {
         emitReadable(this);
       } else if (!state.reading) {
-        process.nextTick(nReadingNextTick, this);
+        nextTick(nReadingNextTick, this);
       }
     }
   }
@@ -841,7 +843,7 @@ Readable.prototype.removeListener = function (ev, fn) {
     // support once('readable', fn) cycles. This means that calling
     // resume within the same tick will have no
     // effect.
-    process.nextTick(updateReadableListening, this);
+    nextTick(updateReadableListening, this);
   }
 
   return res;
@@ -857,7 +859,7 @@ Readable.prototype.removeAllListeners = function (ev) {
     // support once('readable', fn) cycles. This means that calling
     // resume within the same tick will have no
     // effect.
-    process.nextTick(updateReadableListening, this);
+    nextTick(updateReadableListening, this);
   }
 
   return res;
@@ -902,7 +904,7 @@ Readable.prototype.resume = function () {
 function resume(stream, state) {
   if (!state.resumeScheduled) {
     state.resumeScheduled = true;
-    process.nextTick(resume_, stream, state);
+    nextTick(resume_, stream, state);
   }
 }
 
@@ -1081,7 +1083,7 @@ function endReadable(stream) {
 
   if (!state.endEmitted) {
     state.ended = true;
-    process.nextTick(endReadableNT, state, stream);
+    nextTick(endReadableNT, state, stream);
   }
 }
 
@@ -1121,4 +1123,8 @@ function indexOf(xs, x) {
   }
 
   return -1;
+}
+
+function isStdStream(stream, type) {
+  return typeof process === 'undefined' ? false : stream === process[type];
 }
\ No newline at end of file
diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index a2634d7c24..ad592e2b04 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -23,6 +23,8 @@
 // the drain event emission and buffering.
 'use strict';
 
+var nextTick = require('./internal/streams/next-tick');
+
 module.exports = Writable;
 /* <replacement> */
 
@@ -261,7 +263,7 @@ function writeAfterEnd(stream, cb) {
   var er = new ERR_STREAM_WRITE_AFTER_END(); // TODO: defer error events consistently everywhere, not just the cb
 
   errorOrDestroy(stream, er);
-  process.nextTick(cb, er);
+  nextTick(cb, er);
 } // Checks that a user-supplied chunk is valid, especially for the particular
 // mode the stream is in. Currently this means that `null` is never accepted
 // and undefined/non-string values are only allowed in object mode.
@@ -278,7 +280,7 @@ function validChunk(stream, state, chunk, cb) {
 
   if (er) {
     errorOrDestroy(stream, er);
-    process.nextTick(cb, er);
+    nextTick(cb, er);
     return false;
   }
 
@@ -416,10 +418,10 @@ function onwriteError(stream, state, sync, er, cb) {
   if (sync) {
     // defer the callback if we are being called synchronously
     // to avoid piling up things on the stack
-    process.nextTick(cb, er); // this can emit finish, and it will always happen
+    nextTick(cb, er); // this can emit finish, and it will always happen
     // after error
 
-    process.nextTick(finishMaybe, stream, state);
+    nextTick(finishMaybe, stream, state);
     stream._writableState.errorEmitted = true;
     errorOrDestroy(stream, er);
   } else {
@@ -456,7 +458,7 @@ function onwrite(stream, er) {
     }
 
     if (sync) {
-      process.nextTick(afterWrite, stream, state, finished, cb);
+      nextTick(afterWrite, stream, state, finished, cb);
     } else {
       afterWrite(stream, state, finished, cb);
     }
@@ -605,7 +607,7 @@ function prefinish(stream, state) {
     if (typeof stream._final === 'function' && !state.destroyed) {
       state.pendingcb++;
       state.finalCalled = true;
-      process.nextTick(callFinal, stream, state);
+      nextTick(callFinal, stream, state);
     } else {
       state.prefinished = true;
       stream.emit('prefinish');
@@ -643,7 +645,7 @@ function endWritable(stream, state, cb) {
   finishMaybe(stream, state);
 
   if (cb) {
-    if (state.finished) process.nextTick(cb);else stream.once('finish', cb);
+    if (state.finished) nextTick(cb);else stream.once('finish', cb);
   }
 
   state.ended = true;
diff --git a/lib/internal/streams/async_iterator.js b/lib/internal/streams/async_iterator.js
index 9fb615a2f3..b0fb597d5e 100644
--- a/lib/internal/streams/async_iterator.js
+++ b/lib/internal/streams/async_iterator.js
@@ -4,6 +4,8 @@ var _Object$setPrototypeO;
 
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
+var nextTick = require('./next-tick');
+
 var finished = require('./end-of-stream');
 
 var kLastResolve = Symbol('lastResolve');
@@ -41,7 +43,7 @@ function readAndResolve(iter) {
 function onReadable(iter) {
   // we wait for the next tick, because it might
   // emit an error with process.nextTick
-  process.nextTick(readAndResolve, iter);
+  nextTick(readAndResolve, iter);
 }
 
 function wrapForNext(lastPromise, iter) {
@@ -84,7 +86,7 @@ var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPro
       // we cannot guarantee that there is no error lingering around
       // waiting to be emitted.
       return new Promise(function (resolve, reject) {
-        process.nextTick(function () {
+        nextTick(function () {
           if (_this[kError]) {
             reject(_this[kError]);
           } else {
diff --git a/lib/internal/streams/buffer_list.js b/lib/internal/streams/buffer_list.js
index cdea425f19..3411f22833 100644
--- a/lib/internal/streams/buffer_list.js
+++ b/lib/internal/streams/buffer_list.js
@@ -15,8 +15,7 @@ function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _d
 var _require = require('buffer'),
     Buffer = _require.Buffer;
 
-var _require2 = require('util'),
-    inspect = _require2.inspect;
+var inspect = require('./inspect');
 
 var custom = inspect && inspect.custom || 'inspect';
 
@@ -24,9 +23,7 @@ function copyBuffer(src, target, offset) {
   Buffer.prototype.copy.call(src, target, offset);
 }
 
-module.exports =
-/*#__PURE__*/
-function () {
+module.exports = /*#__PURE__*/function () {
   function BufferList() {
     _classCallCheck(this, BufferList);
 
@@ -197,7 +194,7 @@ function () {
   }, {
     key: custom,
     value: function value(_, options) {
-      return inspect(this, _objectSpread({}, options, {
+      return inspect(this, _objectSpread(_objectSpread({}, options), {}, {
         // Only inspect one level.
         depth: 0,
         // It should not recurse.
diff --git a/lib/internal/streams/destroy.js b/lib/internal/streams/destroy.js
index 3268a16f3b..d91d1f0d51 100644
--- a/lib/internal/streams/destroy.js
+++ b/lib/internal/streams/destroy.js
@@ -1,4 +1,7 @@
-'use strict'; // undocumented cb() API, needed for core, not for public API
+'use strict';
+
+var nextTick = require('./next-tick'); // undocumented cb() API, needed for core, not for public API
+
 
 function destroy(err, cb) {
   var _this = this;
@@ -11,10 +14,10 @@ function destroy(err, cb) {
       cb(err);
     } else if (err) {
       if (!this._writableState) {
-        process.nextTick(emitErrorNT, this, err);
+        nextTick(emitErrorNT, this, err);
       } else if (!this._writableState.errorEmitted) {
         this._writableState.errorEmitted = true;
-        process.nextTick(emitErrorNT, this, err);
+        nextTick(emitErrorNT, this, err);
       }
     }
 
@@ -35,18 +38,18 @@ function destroy(err, cb) {
   this._destroy(err || null, function (err) {
     if (!cb && err) {
       if (!_this._writableState) {
-        process.nextTick(emitErrorAndCloseNT, _this, err);
+        nextTick(emitErrorAndCloseNT, _this, err);
       } else if (!_this._writableState.errorEmitted) {
         _this._writableState.errorEmitted = true;
-        process.nextTick(emitErrorAndCloseNT, _this, err);
+        nextTick(emitErrorAndCloseNT, _this, err);
       } else {
-        process.nextTick(emitCloseNT, _this);
+        nextTick(emitCloseNT, _this);
       }
     } else if (cb) {
-      process.nextTick(emitCloseNT, _this);
+      nextTick(emitCloseNT, _this);
       cb(err);
     } else {
-      process.nextTick(emitCloseNT, _this);
+      nextTick(emitCloseNT, _this);
     }
   });
 
diff --git a/lib/internal/streams/from.js b/lib/internal/streams/from.js
index 6c41284416..1eb8066c5d 100644
--- a/lib/internal/streams/from.js
+++ b/lib/internal/streams/from.js
@@ -40,13 +40,13 @@ function from(Readable, iterable, opts) {
   function _next2() {
     _next2 = _asyncToGenerator(function* () {
       try {
-        var _ref = yield iterator.next(),
-            value = _ref.value,
-            done = _ref.done;
+        var _yield$iterator$next = yield iterator.next(),
+            value = _yield$iterator$next.value,
+            done = _yield$iterator$next.done;
 
         if (done) {
           readable.push(null);
-        } else if (readable.push((yield value))) {
+        } else if (readable.push(yield value)) {
           next();
         } else {
           reading = false;
diff --git a/lib/internal/streams/inspect-browser.js b/lib/internal/streams/inspect-browser.js
new file mode 100644
index 0000000000..4e49691352
--- /dev/null
+++ b/lib/internal/streams/inspect-browser.js
@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('browser-util-inspect')
\ No newline at end of file
diff --git a/lib/internal/streams/inspect.js b/lib/internal/streams/inspect.js
new file mode 100644
index 0000000000..2c8916f2a9
--- /dev/null
+++ b/lib/internal/streams/inspect.js
@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('util').inspect
\ No newline at end of file
diff --git a/lib/internal/streams/next-tick-browser.js b/lib/internal/streams/next-tick-browser.js
new file mode 100644
index 0000000000..a4dd5cd5ff
--- /dev/null
+++ b/lib/internal/streams/next-tick-browser.js
@@ -0,0 +1,23 @@
+'use strict';
+
+module.exports = function nextTick2 (cb) {
+    var args = arguments.length > 1 ? Array.prototype.slice.call(arguments, 1) : null;
+    var handle = function () {
+        cb.apply(null, args);
+    };
+
+    // Base on https://github.com/feross/queue-microtask/blob/master/index.js by feross
+    if(typeof queueMicrotask === 'function') {
+        queueMicrotask(handle);
+        return;
+    }
+    if (global.Promise === undefined) {
+        Promise.resolve()
+            .then(handle)
+            .catch(function (err) {
+                setTimeout(function () { throw err }, 0);
+            });
+        return;
+    }
+    setTimeout(handle, 0);
+};
diff --git a/lib/internal/streams/next-tick.js b/lib/internal/streams/next-tick.js
new file mode 100644
index 0000000000..3f3fa1c938
--- /dev/null
+++ b/lib/internal/streams/next-tick.js
@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = process.nextTick
\ No newline at end of file
diff --git a/package.json b/package.json
index 48fa4741e3..8f3887e2ce 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,9 @@
     "node": ">= 6"
   },
   "dependencies": {
+    "browser-util-inspect": "^0.2.0",
+    "buffer": "^5.6.0",
+    "events": "^3.1.0",
     "inherits": "^2.0.3",
     "string_decoder": "^1.1.1",
     "util-deprecate": "^1.0.1"
@@ -59,7 +62,9 @@
     "./errors": "./errors-browser.js",
     "./readable.js": "./readable-browser.js",
     "./lib/internal/streams/from.js": "./lib/internal/streams/from-browser.js",
-    "./lib/internal/streams/stream.js": "./lib/internal/streams/stream-browser.js"
+    "./lib/internal/streams/stream.js": "./lib/internal/streams/stream-browser.js",
+    "./lib/internal/streams/next-tick.js": "./lib/internal/streams/next-tick-browser.js",
+    "./lib/internal/streams/inspect.js": "./lib/internal/streams/inspect-browser.js"
   },
   "nyc": {
     "include": [
diff --git a/test/browser/test-stream-push-strings.js b/test/browser/test-stream-push-strings.js
index 1de240efd8..d42aa9c0f1 100644
--- a/test/browser/test-stream-push-strings.js
+++ b/test/browser/test-stream-push-strings.js
@@ -1,6 +1,6 @@
 'use strict';
 var common = require('../common');
-
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var Readable = require('../../').Readable;
 var inherits = require('inherits');
 
@@ -24,7 +24,7 @@ module.exports = function (t) {
         case 2:
           return this.push('second to last chunk');
         case 3:
-          return process.nextTick(function() {
+          return nextTick(function() {
             this.push('first chunk');
           }.bind(this));
         default:
diff --git a/test/browser/test-stream2-base64-single-char-read-end.js b/test/browser/test-stream2-base64-single-char-read-end.js
index 86b66f81d5..3fd5f11ff6 100644
--- a/test/browser/test-stream2-base64-single-char-read-end.js
+++ b/test/browser/test-stream2-base64-single-char-read-end.js
@@ -1,5 +1,6 @@
 'use strict';
 var common = require('../common');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var R = require('../../lib/_stream_readable');
 var W = require('../../lib/_stream_writable');
 module.exports = function (t) {
@@ -14,7 +15,7 @@ module.exports = function (t) {
   src._read = function(n) {
     if(!hasRead) {
       hasRead = true;
-      process.nextTick(function() {
+      nextTick(function() {
         src.push(Buffer.from('1'));
         src.push(null);
       });
diff --git a/test/browser/test-stream2-objects.js b/test/browser/test-stream2-objects.js
index 26a038b599..95fe295113 100644
--- a/test/browser/test-stream2-objects.js
+++ b/test/browser/test-stream2-objects.js
@@ -1,5 +1,6 @@
 'use strict';
 var common = require('../common');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var Readable = require('../../lib/_stream_readable');
 var Writable = require('../../lib/_stream_writable');
 
@@ -94,7 +95,7 @@ module.exports = function (t) {
     var list = [{ one: '1'}, { two: '2' }];
     r._read = function(n) {
       var item = list.shift();
-      process.nextTick(function() {
+      nextTick(function() {
         r.push(item || null);
       });
     };
@@ -256,7 +257,7 @@ module.exports = function (t) {
 
     w._write = function(chunk, encoding, cb) {
       list.push(chunk);
-      process.nextTick(cb);
+      nextTick(cb);
     };
 
     w.on('finish', function() {
@@ -282,7 +283,7 @@ module.exports = function (t) {
     w._write = function(chunk, encoding, cb) {
       t.equal(chunk, 'foo');
 
-      process.nextTick(function() {
+      nextTick(function() {
         called = true;
         cb();
       });
diff --git a/test/browser/test-stream2-push.js b/test/browser/test-stream2-push.js
index 7ca5f39ef3..e1e879ec78 100644
--- a/test/browser/test-stream2-push.js
+++ b/test/browser/test-stream2-push.js
@@ -1,5 +1,6 @@
 'use strict';
 var common = require('../common');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var stream = require('../../');
 var Readable = stream.Readable;
 var Writable = stream.Writable;
@@ -49,7 +50,7 @@ module.exports = function (t) {
     function readStop() {
       //console.error('readStop');
       reading = false;
-      process.nextTick(function() {
+      nextTick(function() {
         var r = stream.read();
         if (r !== null)
           writer.write(r);
@@ -73,7 +74,7 @@ module.exports = function (t) {
     writer._write = function(chunk, encoding, cb) {
       //console.error('WRITE %s', chunk);
       written.push(chunk);
-      process.nextTick(cb);
+      nextTick(cb);
     };
 
     writer.on('finish', finish);
diff --git a/test/browser/test-stream2-readable-empty-buffer-no-eof.js b/test/browser/test-stream2-readable-empty-buffer-no-eof.js
index fd86d67bc5..881352309e 100644
--- a/test/browser/test-stream2-readable-empty-buffer-no-eof.js
+++ b/test/browser/test-stream2-readable-empty-buffer-no-eof.js
@@ -1,6 +1,6 @@
 'use strict';
 var common = require('../common');
-
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var Readable = require('../../').Readable;
 
 module.exports = function (t) {
@@ -32,7 +32,7 @@ module.exports = function (t) {
           return r.push(Buffer.alloc(0)); // Not-EOF!
         case 3:
           setTimeout(r.read.bind(r, 0), 50);
-          return process.nextTick(function() {
+          return nextTick(function() {
             return r.push(Buffer.alloc(0));
           });
         case 4:
diff --git a/test/browser/test-stream2-readable-legacy-drain.js b/test/browser/test-stream2-readable-legacy-drain.js
index 30fd350f97..c87cc14f83 100644
--- a/test/browser/test-stream2-readable-legacy-drain.js
+++ b/test/browser/test-stream2-readable-legacy-drain.js
@@ -1,6 +1,6 @@
 'use strict';
 var common = require('../common');
-
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var Stream = require('../../');
 var Readable = require('../../').Readable;
 module.exports = function (t) {
@@ -23,7 +23,7 @@ module.exports = function (t) {
     w.write = function(c) {
       writes += c.length;
       buffered += c.length;
-      process.nextTick(drain);
+      nextTick(drain);
       return false;
     };
 
diff --git a/test/browser/test-stream2-transform.js b/test/browser/test-stream2-transform.js
index 338fcdc5c0..fc0ccf98d1 100644
--- a/test/browser/test-stream2-transform.js
+++ b/test/browser/test-stream2-transform.js
@@ -1,5 +1,6 @@
 'use strict';
 var common = require('../common');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var PassThrough = require('../../lib/_stream_passthrough');
 var Transform = require('../../lib/_stream_transform');
 
@@ -248,7 +249,7 @@ module.exports = function (t) {
     };
 
     pt.once('readable', function() {
-      process.nextTick(function() {
+      nextTick(function() {
         pt.write(Buffer.from('d'));
         pt.write(Buffer.from('ef'), function() {
           pt.end();
@@ -417,7 +418,7 @@ module.exports = function (t) {
     // read one more time to get the 'end' event
     jp.read();
 
-    process.nextTick(function() {
+    nextTick(function() {
       t.ok(ended);
       t.end();
     });
@@ -459,7 +460,7 @@ module.exports = function (t) {
     // read one more time to get the 'end' event
     js.read();
 
-    process.nextTick(function() {
+    nextTick(function() {
       t.ok(ended);
       t.end();
     });
diff --git a/test/browser/test-stream2-unpipe-drain.js b/test/browser/test-stream2-unpipe-drain.js
index d3ebbe86c0..b7bd4a58cd 100644
--- a/test/browser/test-stream2-unpipe-drain.js
+++ b/test/browser/test-stream2-unpipe-drain.js
@@ -1,7 +1,7 @@
 'use strict';
 var common = require('../common');
 var stream = require('../../');
-
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var crypto = require('crypto');
 
 var inherits = require('inherits');
@@ -42,12 +42,12 @@ module.exports = function (t) {
     src1.pipe(dest);
 
     src1.once('readable', function() {
-      process.nextTick(function() {
+      nextTick(function() {
 
         src2.pipe(dest);
 
         src2.once('readable', function() {
-          process.nextTick(function() {
+          nextTick(function() {
 
             src1.unpipe(dest);
           });
diff --git a/test/browser/test-stream2-writable.js b/test/browser/test-stream2-writable.js
index ca08fdb1b9..bbfa1d6518 100644
--- a/test/browser/test-stream2-writable.js
+++ b/test/browser/test-stream2-writable.js
@@ -1,5 +1,6 @@
 'use strict';
 var common = require('../common');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var W = require('../../lib/_stream_writable');
 var D = require('../../lib/_stream_duplex');
 
@@ -196,7 +197,7 @@ module.exports = function (t) {
     });
 
     tw.on('finish', function() {
-      process.nextTick(function() {
+      nextTick(function() {
         t.same(tw.buffer, chunks, 'got chunks in the right order');
         t.same(callbacks._called, chunks, 'called all callbacks');
         t.end();
@@ -296,7 +297,7 @@ module.exports = function (t) {
     });
     w.end('this is the end');
     w.end('and so is this');
-    process.nextTick(function() {
+    nextTick(function() {
       t.ok(gotError);
       t.end();
     });
@@ -358,7 +359,7 @@ module.exports = function (t) {
   test('finish is emitted if last chunk is empty', function(t) {
     var w = new W();
     w._write = function(chunk, e, cb) {
-      process.nextTick(cb);
+      nextTick(cb);
     };
     w.on('finish', function() {
       t.end();
diff --git a/test/browser/test-stream3-pause-then-read.js b/test/browser/test-stream3-pause-then-read.js
index 9684ea7774..1fdcc5dfb4 100644
--- a/test/browser/test-stream3-pause-then-read.js
+++ b/test/browser/test-stream3-pause-then-read.js
@@ -2,6 +2,7 @@
 var common = require('../common');
 
 var stream = require('../../');
+var nextTick = require('../../lib/internal/streams/next-tick') 
 var Readable = stream.Readable;
 var Writable = stream.Writable;
 
@@ -18,7 +19,7 @@ module.exports = function (t){
       if (!(chunks % 2))
         setImmediate(push);
       else if (!(chunks % 3))
-        process.nextTick(push);
+        nextTick(push);
       else
         push();
     };
diff --git a/test/common/countdown.js b/test/common/countdown.js
index 39193672b5..44f6bd7cd8 100644
--- a/test/common/countdown.js
+++ b/test/common/countdown.js
@@ -42,9 +42,7 @@ var kCallback = Symbol('callback');
 
 var common = require('./');
 
-var Countdown =
-/*#__PURE__*/
-function () {
+var Countdown = /*#__PURE__*/function () {
   function Countdown(limit, cb) {
     _classCallCheck(this, Countdown);
 
diff --git a/test/common/dns.js b/test/common/dns.js
index f63b686fd2..fb24f70f2f 100644
--- a/test/common/dns.js
+++ b/test/common/dns.js
@@ -1,10 +1,16 @@
 "use strict";
 
-function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e2) { throw _e2; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e3) { didErr = true; err = _e3; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
 
-function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); }
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
 
-function _iterableToArrayLimit(arr, i) { if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === "[object Arguments]")) { return; } var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
 
 function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
 
@@ -216,12 +222,12 @@ function writeIPv6(ip) {
   var parts = ip.replace(/^:|:$/g, '').split(':');
   var buf = Buffer.alloc(16);
   var offset = 0;
-  var _iteratorNormalCompletion = true;
-  var _didIteratorError = false;
-  var _iteratorError = undefined;
+
+  var _iterator = _createForOfIteratorHelper(parts),
+      _step;
 
   try {
-    for (var _iterator = parts[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+    for (_iterator.s(); !(_step = _iterator.n()).done;) {
       var part = _step.value;
 
       if (part === '') {
@@ -232,18 +238,9 @@ function writeIPv6(ip) {
       }
     }
   } catch (err) {
-    _didIteratorError = true;
-    _iteratorError = err;
+    _iterator.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion && _iterator.return != null) {
-        _iterator.return();
-      }
-    } finally {
-      if (_didIteratorError) {
-        throw _iteratorError;
-      }
-    }
+    _iterator.f();
   }
 
   return buf;
@@ -260,38 +257,28 @@ function writeDNSPacket(parsed) {
   var buffers = [];
   var kStandardResponseFlags = 0x8180;
   buffers.push(new Uint16Array([parsed.id, parsed.flags === undefined ? kStandardResponseFlags : parsed.flags, parsed.questions && parsed.questions.length, parsed.answers && parsed.answers.length, parsed.authorityAnswers && parsed.authorityAnswers.length, parsed.additionalRecords && parsed.additionalRecords.length]));
-  var _iteratorNormalCompletion2 = true;
-  var _didIteratorError2 = false;
-  var _iteratorError2 = undefined;
+
+  var _iterator2 = _createForOfIteratorHelper(parsed.questions),
+      _step2;
 
   try {
-    for (var _iterator2 = parsed.questions[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+    for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
       var q = _step2.value;
       assert(types[q.type]);
       buffers.push(writeDomainName(q.domain));
       buffers.push(new Uint16Array([types[q.type], q.cls === undefined ? classes.IN : q.cls]));
     }
   } catch (err) {
-    _didIteratorError2 = true;
-    _iteratorError2 = err;
+    _iterator2.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
-        _iterator2.return();
-      }
-    } finally {
-      if (_didIteratorError2) {
-        throw _iteratorError2;
-      }
-    }
+    _iterator2.f();
   }
 
-  var _iteratorNormalCompletion3 = true;
-  var _didIteratorError3 = false;
-  var _iteratorError3 = undefined;
+  var _iterator3 = _createForOfIteratorHelper([].concat(parsed.answers, parsed.authorityAnswers, parsed.additionalRecords)),
+      _step3;
 
   try {
-    for (var _iterator3 = [].concat(parsed.answers, parsed.authorityAnswers, parsed.additionalRecords)[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
+    for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
       var rr = _step3.value;
       if (!rr) continue;
       assert(types[rr.type]);
@@ -320,29 +307,20 @@ function writeDNSPacket(parsed) {
           }); // Total length of all strings + 1 byte each for their lengths.
 
           rdLengthBuf[0] = rr.entries.length + total;
-          var _iteratorNormalCompletion4 = true;
-          var _didIteratorError4 = false;
-          var _iteratorError4 = undefined;
+
+          var _iterator4 = _createForOfIteratorHelper(rr.entries),
+              _step4;
 
           try {
-            for (var _iterator4 = rr.entries[Symbol.iterator](), _step4; !(_iteratorNormalCompletion4 = (_step4 = _iterator4.next()).done); _iteratorNormalCompletion4 = true) {
+            for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
               var txt = _step4.value;
               buffers.push(new Uint8Array([Buffer.byteLength(txt)]));
               buffers.push(Buffer.from(txt));
             }
           } catch (err) {
-            _didIteratorError4 = true;
-            _iteratorError4 = err;
+            _iterator4.e(err);
           } finally {
-            try {
-              if (!_iteratorNormalCompletion4 && _iterator4.return != null) {
-                _iterator4.return();
-              }
-            } finally {
-              if (_didIteratorError4) {
-                throw _iteratorError4;
-              }
-            }
+            _iterator4.f();
           }
 
           break;
@@ -377,18 +355,9 @@ function writeDNSPacket(parsed) {
       }
     }
   } catch (err) {
-    _didIteratorError3 = true;
-    _iteratorError3 = err;
+    _iterator3.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion3 && _iterator3.return != null) {
-        _iterator3.return();
-      }
-    } finally {
-      if (_didIteratorError3) {
-        throw _iteratorError3;
-      }
-    }
+    _iterator3.f();
   }
 
   return Buffer.concat(buffers.map(function (typedArray) {
diff --git a/test/common/duplexpair.js b/test/common/duplexpair.js
index d4277740aa..143bf1455b 100644
--- a/test/common/duplexpair.js
+++ b/test/common/duplexpair.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 /*<replacement>*/
 require('@babel/polyfill');
@@ -53,17 +57,17 @@ var assert = require('assert');
 var kCallback = Symbol('Callback');
 var kOtherSide = Symbol('Other');
 
-var DuplexSocket =
-/*#__PURE__*/
-function (_Duplex) {
+var DuplexSocket = /*#__PURE__*/function (_Duplex) {
   _inherits(DuplexSocket, _Duplex);
 
+  var _super = _createSuper(DuplexSocket);
+
   function DuplexSocket() {
     var _this;
 
     _classCallCheck(this, DuplexSocket);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(DuplexSocket).call(this));
+    _this = _super.call(this);
     _this[kCallback] = null;
     _this[kOtherSide] = null;
     return _this;
diff --git a/test/common/fixtures.js b/test/common/fixtures.js
index 1ddc225e71..5eeae733bb 100644
--- a/test/common/fixtures.js
+++ b/test/common/fixtures.js
@@ -1,12 +1,16 @@
 "use strict";
 
-function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
 
-function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance"); }
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
 
-function _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter); }
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
 
-function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); }
+
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
 
 /*<replacement>*/
 require('@babel/polyfill');
diff --git a/test/common/heap.js b/test/common/heap.js
index 0675fdf453..493f18ad21 100644
--- a/test/common/heap.js
+++ b/test/common/heap.js
@@ -1,5 +1,11 @@
 "use strict";
 
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
 function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
@@ -85,9 +91,7 @@ function isEdge(edge, _ref) {
   return true;
 }
 
-var State =
-/*#__PURE__*/
-function () {
+var State = /*#__PURE__*/function () {
   function State() {
     _classCallCheck(this, State);
 
@@ -113,18 +117,16 @@ function () {
         assert.strictEqual(rootNodes.length, expected.length, "Expect to find ".concat(expected.length, " '").concat(rootName, "', ") + "found ".concat(rootNodes.length));
       }
 
-      var _iteratorNormalCompletion = true;
-      var _didIteratorError = false;
-      var _iteratorError = undefined;
+      var _iterator = _createForOfIteratorHelper(expected),
+          _step;
 
       try {
-        for (var _iterator = expected[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+        for (_iterator.s(); !(_step = _iterator.n()).done;) {
           var expectation = _step.value;
 
           if (expectation.children) {
-            var _iteratorNormalCompletion2 = true;
-            var _didIteratorError2 = false;
-            var _iteratorError2 = undefined;
+            var _iterator2 = _createForOfIteratorHelper(expectation.children),
+                _step2;
 
             try {
               var _loop = function _loop() {
@@ -143,38 +145,20 @@ function () {
                 }
               };
 
-              for (var _iterator2 = expectation.children[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+              for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
                 _loop();
               }
             } catch (err) {
-              _didIteratorError2 = true;
-              _iteratorError2 = err;
+              _iterator2.e(err);
             } finally {
-              try {
-                if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
-                  _iterator2.return();
-                }
-              } finally {
-                if (_didIteratorError2) {
-                  throw _iteratorError2;
-                }
-              }
+              _iterator2.f();
             }
           }
         }
       } catch (err) {
-        _didIteratorError = true;
-        _iteratorError = err;
+        _iterator.e(err);
       } finally {
-        try {
-          if (!_iteratorNormalCompletion && _iterator.return != null) {
-            _iterator.return();
-          }
-        } finally {
-          if (_didIteratorError) {
-            throw _iteratorError;
-          }
-        }
+        _iterator.f();
       }
     } // Validate our internal embedded graph representation
 
@@ -195,18 +179,16 @@ function () {
         assert.strictEqual(rootNodes.length, expected.length, "Expect to find ".concat(expected.length, " '").concat(rootName, "', ") + "found ".concat(rootNodes.length));
       }
 
-      var _iteratorNormalCompletion3 = true;
-      var _didIteratorError3 = false;
-      var _iteratorError3 = undefined;
+      var _iterator3 = _createForOfIteratorHelper(expected),
+          _step3;
 
       try {
-        for (var _iterator3 = expected[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
+        for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
           var expectation = _step3.value;
 
           if (expectation.children) {
-            var _iteratorNormalCompletion4 = true;
-            var _didIteratorError4 = false;
-            var _iteratorError4 = undefined;
+            var _iterator4 = _createForOfIteratorHelper(expectation.children),
+                _step4;
 
             try {
               var _loop2 = function _loop2() {
@@ -226,38 +208,20 @@ function () {
                 }
               };
 
-              for (var _iterator4 = expectation.children[Symbol.iterator](), _step4; !(_iteratorNormalCompletion4 = (_step4 = _iterator4.next()).done); _iteratorNormalCompletion4 = true) {
+              for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
                 _loop2();
               }
             } catch (err) {
-              _didIteratorError4 = true;
-              _iteratorError4 = err;
+              _iterator4.e(err);
             } finally {
-              try {
-                if (!_iteratorNormalCompletion4 && _iterator4.return != null) {
-                  _iterator4.return();
-                }
-              } finally {
-                if (_didIteratorError4) {
-                  throw _iteratorError4;
-                }
-              }
+              _iterator4.f();
             }
           }
         }
       } catch (err) {
-        _didIteratorError3 = true;
-        _iteratorError3 = err;
+        _iterator3.e(err);
       } finally {
-        try {
-          if (!_iteratorNormalCompletion3 && _iterator3.return != null) {
-            _iterator3.return();
-          }
-        } finally {
-          if (_didIteratorError3) {
-            throw _iteratorError3;
-          }
-        }
+        _iterator3.f();
       }
     }
   }, {
diff --git a/test/common/http2.js b/test/common/http2.js
index 73ea152027..943969c3fe 100644
--- a/test/common/http2.js
+++ b/test/common/http2.js
@@ -1,14 +1,18 @@
 "use strict";
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
@@ -89,9 +93,7 @@ function write8(array, pos, val) {
   array[pos] = val;
 }
 
-var Frame =
-/*#__PURE__*/
-function () {
+var Frame = /*#__PURE__*/function () {
   function Frame(length, type, flags, id) {
     _classCallCheck(this, Frame);
 
@@ -112,11 +114,11 @@ function () {
   return Frame;
 }();
 
-var SettingsFrame =
-/*#__PURE__*/
-function (_Frame) {
+var SettingsFrame = /*#__PURE__*/function (_Frame) {
   _inherits(SettingsFrame, _Frame);
 
+  var _super = _createSuper(SettingsFrame);
+
   function SettingsFrame() {
     var ack = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
 
@@ -124,17 +126,17 @@ function (_Frame) {
 
     var flags = 0;
     if (ack) flags |= FLAG_ACK;
-    return _possibleConstructorReturn(this, _getPrototypeOf(SettingsFrame).call(this, 0, 4, flags, 0));
+    return _super.call(this, 0, 4, flags, 0);
   }
 
   return SettingsFrame;
 }(Frame);
 
-var DataFrame =
-/*#__PURE__*/
-function (_Frame2) {
+var DataFrame = /*#__PURE__*/function (_Frame2) {
   _inherits(DataFrame, _Frame2);
 
+  var _super2 = _createSuper(DataFrame);
+
   function DataFrame(id, payload) {
     var _this;
 
@@ -155,7 +157,7 @@ function (_Frame2) {
       flags |= FLAG_PADDED;
     }
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(DataFrame).call(this, len, 0, flags, id));
+    _this = _super2.call(this, len, 0, flags, id);
     buffers.unshift(_this[kFrameData]);
     _this[kFrameData] = Buffer.concat(buffers);
     return _this;
@@ -164,11 +166,11 @@ function (_Frame2) {
   return DataFrame;
 }(Frame);
 
-var HeadersFrame =
-/*#__PURE__*/
-function (_Frame3) {
+var HeadersFrame = /*#__PURE__*/function (_Frame3) {
   _inherits(HeadersFrame, _Frame3);
 
+  var _super3 = _createSuper(HeadersFrame);
+
   function HeadersFrame(id, payload) {
     var _this2;
 
@@ -189,7 +191,7 @@ function (_Frame3) {
       flags |= FLAG_PADDED;
     }
 
-    _this2 = _possibleConstructorReturn(this, _getPrototypeOf(HeadersFrame).call(this, len, 1, flags, id));
+    _this2 = _super3.call(this, len, 1, flags, id);
     buffers.unshift(_this2[kFrameData]);
     _this2[kFrameData] = Buffer.concat(buffers);
     return _this2;
@@ -198,11 +200,11 @@ function (_Frame3) {
   return HeadersFrame;
 }(Frame);
 
-var PingFrame =
-/*#__PURE__*/
-function (_Frame4) {
+var PingFrame = /*#__PURE__*/function (_Frame4) {
   _inherits(PingFrame, _Frame4);
 
+  var _super4 = _createSuper(PingFrame);
+
   function PingFrame() {
     var _this3;
 
@@ -211,7 +213,7 @@ function (_Frame4) {
     _classCallCheck(this, PingFrame);
 
     var buffers = [Buffer.alloc(8)];
-    _this3 = _possibleConstructorReturn(this, _getPrototypeOf(PingFrame).call(this, 8, 6, ack ? 1 : 0, 0));
+    _this3 = _super4.call(this, 8, 6, ack ? 1 : 0, 0);
     buffers.unshift(_this3[kFrameData]);
     _this3[kFrameData] = Buffer.concat(buffers);
     return _this3;
@@ -220,18 +222,18 @@ function (_Frame4) {
   return PingFrame;
 }(Frame);
 
-var AltSvcFrame =
-/*#__PURE__*/
-function (_Frame5) {
+var AltSvcFrame = /*#__PURE__*/function (_Frame5) {
   _inherits(AltSvcFrame, _Frame5);
 
+  var _super5 = _createSuper(AltSvcFrame);
+
   function AltSvcFrame(size) {
     var _this4;
 
     _classCallCheck(this, AltSvcFrame);
 
     var buffers = [Buffer.alloc(size)];
-    _this4 = _possibleConstructorReturn(this, _getPrototypeOf(AltSvcFrame).call(this, size, 10, 0, 0));
+    _this4 = _super5.call(this, size, 10, 0, 0);
     buffers.unshift(_this4[kFrameData]);
     _this4[kFrameData] = Buffer.concat(buffers);
     return _this4;
diff --git a/test/common/index.js b/test/common/index.js
index 8c7f9d030a..da4e4ae4ae 100644
--- a/test/common/index.js
+++ b/test/common/index.js
@@ -4,13 +4,19 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
-function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
 
-function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance"); }
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
 
-function _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter); }
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); }
 
-function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e2) { throw _e2; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e3) { didErr = true; err = _e3; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
 
 /*<replacement>*/
 require('@babel/polyfill');
@@ -129,12 +135,12 @@ if (false && isMainThread && module.parent && require('cluster').isMaster) {
     var args = process.execArgv.map(function (arg) {
       return arg.replace(/_/g, '-');
     });
-    var _iteratorNormalCompletion = true;
-    var _didIteratorError = false;
-    var _iteratorError = undefined;
+
+    var _iterator = _createForOfIteratorHelper(flags),
+        _step;
 
     try {
-      for (var _iterator = flags[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+      for (_iterator.s(); !(_step = _iterator.n()).done;) {
         var flag = _step.value;
 
         if (!args.includes(flag) && // If the binary was built without-ssl then the crypto flags are
@@ -146,18 +152,9 @@ if (false && isMainThread && module.parent && require('cluster').isMaster) {
         }
       }
     } catch (err) {
-      _didIteratorError = true;
-      _iteratorError = err;
+      _iterator.e(err);
     } finally {
-      try {
-        if (!_iteratorNormalCompletion && _iterator.return != null) {
-          _iterator.return();
-        }
-      } finally {
-        if (_didIteratorError) {
-          throw _iteratorError;
-        }
-      }
+      _iterator.f();
     }
   }
 }
@@ -610,28 +607,18 @@ function expectWarning(nameOrMap, expected, code) {
 var Comparison = function Comparison(obj, keys) {
   _classCallCheck(this, Comparison);
 
-  var _iteratorNormalCompletion2 = true;
-  var _didIteratorError2 = false;
-  var _iteratorError2 = undefined;
+  var _iterator2 = _createForOfIteratorHelper(keys),
+      _step2;
 
   try {
-    for (var _iterator2 = keys[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+    for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
       var key = _step2.value;
       if (key in obj) this[key] = obj[key];
     }
   } catch (err) {
-    _didIteratorError2 = true;
-    _iteratorError2 = err;
+    _iterator2.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
-        _iterator2.return();
-      }
-    } finally {
-      if (_didIteratorError2) {
-        throw _iteratorError2;
-      }
-    }
+    _iterator2.f();
   }
 }; // Useful for testing expected internal/error objects
 
@@ -681,12 +668,12 @@ function expectsError(fn, settings, exact) {
 
 
     var keys = objectKeys(settings);
-    var _iteratorNormalCompletion3 = true;
-    var _didIteratorError3 = false;
-    var _iteratorError3 = undefined;
+
+    var _iterator3 = _createForOfIteratorHelper(keys),
+        _step3;
 
     try {
-      for (var _iterator3 = keys[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
+      for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
         var key = _step3.value;
 
         if (!require('deep-strict-equal')(error[key], innerSettings[key])) {
@@ -695,34 +682,27 @@ function expectsError(fn, settings, exact) {
           var b = new Comparison(innerSettings, keys);
           var tmpLimit = Error.stackTraceLimit;
           Error.stackTraceLimit = 0;
-          var err = new assert.AssertionError({
+
+          var _err = new assert.AssertionError({
             actual: a,
             expected: b,
             operator: 'strictEqual',
             stackStartFn: assert.throws
           });
+
           Error.stackTraceLimit = tmpLimit;
           throw new assert.AssertionError({
             actual: error,
             expected: settings,
             operator: 'common.expectsError',
-            message: err.message
+            message: _err.message
           });
         }
       }
     } catch (err) {
-      _didIteratorError3 = true;
-      _iteratorError3 = err;
+      _iterator3.e(err);
     } finally {
-      try {
-        if (!_iteratorNormalCompletion3 && _iterator3.return != null) {
-          _iterator3.return();
-        }
-      } finally {
-        if (_didIteratorError3) {
-          throw _iteratorError3;
-        }
-      }
+      _iterator3.f();
     }
 
     return true;
diff --git a/test/common/inspector-helper.js b/test/common/inspector-helper.js
index f90d43220b..40e0f69cc9 100644
--- a/test/common/inspector-helper.js
+++ b/test/common/inspector-helper.js
@@ -1,14 +1,18 @@
 "use strict";
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
 
@@ -20,6 +24,12 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
 /*<replacement>*/
 require('@babel/polyfill');
 
@@ -100,28 +110,19 @@ function makeBufferingDataCallback(dataCallback) {
     var str = newData.toString('utf8');
     var lines = str.replace(/\r/g, '').split('\n');
     if (str.endsWith('\n')) buffer = Buffer.alloc(0);else buffer = Buffer.from(lines.pop(), 'utf8');
-    var _iteratorNormalCompletion = true;
-    var _didIteratorError = false;
-    var _iteratorError = undefined;
+
+    var _iterator = _createForOfIteratorHelper(lines),
+        _step;
 
     try {
-      for (var _iterator = lines[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+      for (_iterator.s(); !(_step = _iterator.n()).done;) {
         var line = _step.value;
         dataCallback(line);
       }
     } catch (err) {
-      _didIteratorError = true;
-      _iteratorError = err;
+      _iterator.e(err);
     } finally {
-      try {
-        if (!_iteratorNormalCompletion && _iterator.return != null) {
-          _iterator.return();
-        }
-      } finally {
-        if (_didIteratorError) {
-          throw _iteratorError;
-        }
-      }
+      _iterator.f();
     }
   };
 }
@@ -216,9 +217,7 @@ function formatWSFrame(message) {
   return Buffer.concat([wsHeaderBuf.slice(0, maskOffset + 4), messageBuf]);
 }
 
-var InspectorSession =
-/*#__PURE__*/
-function () {
+var InspectorSession = /*#__PURE__*/function () {
   function InspectorSession(socket, instance) {
     var _this = this;
 
@@ -420,28 +419,19 @@ function () {
 
         if (params.type === type) {
           var _i2 = 0;
-          var _iteratorNormalCompletion2 = true;
-          var _didIteratorError2 = false;
-          var _iteratorError2 = undefined;
+
+          var _iterator2 = _createForOfIteratorHelper(params.args),
+              _step2;
 
           try {
-            for (var _iterator2 = params.args[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+            for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
               var value = _step2.value;
               if (value.value !== values[_i2++]) return false;
             }
           } catch (err) {
-            _didIteratorError2 = true;
-            _iteratorError2 = err;
+            _iterator2.e(err);
           } finally {
-            try {
-              if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
-                _iterator2.return();
-              }
-            } finally {
-              if (_didIteratorError2) {
-                throw _iteratorError2;
-              }
-            }
+            _iterator2.f();
           }
 
           return _i2 === values.length;
@@ -503,11 +493,11 @@ function () {
   return InspectorSession;
 }();
 
-var NodeInstance =
-/*#__PURE__*/
-function (_EventEmitter) {
+var NodeInstance = /*#__PURE__*/function (_EventEmitter) {
   _inherits(NodeInstance, _EventEmitter);
 
+  var _super = _createSuper(NodeInstance);
+
   function NodeInstance() {
     var _this7;
 
@@ -517,7 +507,7 @@ function (_EventEmitter) {
 
     _classCallCheck(this, NodeInstance);
 
-    _this7 = _possibleConstructorReturn(this, _getPrototypeOf(NodeInstance).call(this));
+    _this7 = _super.call(this);
     _this7._scriptPath = scriptFile;
     _this7._script = scriptFile ? null : scriptContents;
     _this7._portCallback = null;
diff --git a/test/common/internet.js b/test/common/internet.js
index e34dabbe21..325f539d59 100644
--- a/test/common/internet.js
+++ b/test/common/internet.js
@@ -1,5 +1,11 @@
 "use strict";
 
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
 /*<replacement>*/
 require('@babel/polyfill');
 
@@ -68,12 +74,12 @@ var addresses = {
   // An accessible IPv4 DNS server
   DNS6_SERVER: '2001:4860:4860::8888'
 };
-var _iteratorNormalCompletion = true;
-var _didIteratorError = false;
-var _iteratorError = undefined;
+
+var _iterator = _createForOfIteratorHelper(objectKeys(addresses)),
+    _step;
 
 try {
-  for (var _iterator = objectKeys(addresses)[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+  for (_iterator.s(); !(_step = _iterator.n()).done;) {
     var key = _step.value;
     var envName = "NODE_TEST_".concat(key);
 
@@ -82,18 +88,9 @@ try {
     }
   }
 } catch (err) {
-  _didIteratorError = true;
-  _iteratorError = err;
+  _iterator.e(err);
 } finally {
-  try {
-    if (!_iteratorNormalCompletion && _iterator.return != null) {
-      _iterator.return();
-    }
-  } finally {
-    if (_didIteratorError) {
-      throw _iteratorError;
-    }
-  }
+  _iterator.f();
 }
 
 module.exports = {
diff --git a/test/common/tls.js b/test/common/tls.js
index 98b00d0e09..47261b0e15 100644
--- a/test/common/tls.js
+++ b/test/common/tls.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 /*<replacement>*/
 require('@babel/polyfill');
@@ -51,17 +55,17 @@ var net = require('net');
 
 exports.ccs = Buffer.from('140303000101', 'hex');
 
-var TestTLSSocket =
-/*#__PURE__*/
-function (_net$Socket) {
+var TestTLSSocket = /*#__PURE__*/function (_net$Socket) {
   _inherits(TestTLSSocket, _net$Socket);
 
+  var _super = _createSuper(TestTLSSocket);
+
   function TestTLSSocket(server_cert) {
     var _this;
 
     _classCallCheck(this, TestTLSSocket);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestTLSSocket).call(this));
+    _this = _super.call(this);
     _this.server_cert = server_cert;
     _this.version = Buffer.from('0303', 'hex');
     _this.handshake_list = []; // AES128-GCM-SHA256
diff --git a/test/ours/lolex-fake-timers.js b/test/ours/lolex-fake-timers.js
index 59af1328ea..21ee3e7bee 100644
--- a/test/ours/lolex-fake-timers.js
+++ b/test/ours/lolex-fake-timers.js
@@ -3,6 +3,7 @@ var tap = require('tap');
 var util = require('util');
 var assert = require('assert');
 var lolex = require('lolex');
+var clock = lolex.install({toFake: [ 'setImmediate', 'nextTick' ]});
 var stream = require('../../');
 var Transform = stream.Transform;
 
@@ -12,7 +13,6 @@ function MyTransform() {
 
 util.inherits(MyTransform, Transform);
 
-var clock = lolex.install({toFake: [ 'setImmediate', 'nextTick' ]});
 var stream2DataCalled = false;
 
 var stream = new MyTransform();
diff --git a/test/parallel/test-stream-big-packet.js b/test/parallel/test-stream-big-packet.js
index 063dee3e1e..73188557eb 100644
--- a/test/parallel/test-stream-big-packet.js
+++ b/test/parallel/test-stream-big-packet.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -50,15 +54,15 @@ var stream = require('../../');
 
 var passed = false;
 
-var TestStream =
-/*#__PURE__*/
-function (_stream$Transform) {
+var TestStream = /*#__PURE__*/function (_stream$Transform) {
   _inherits(TestStream, _stream$Transform);
 
+  var _super = _createSuper(TestStream);
+
   function TestStream() {
     _classCallCheck(this, TestStream);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(TestStream).apply(this, arguments));
+    return _super.apply(this, arguments);
   }
 
   _createClass(TestStream, [{
diff --git a/test/parallel/test-stream-events-prepend.js b/test/parallel/test-stream-events-prepend.js
index adfe99df5c..fd6dfb2594 100644
--- a/test/parallel/test-stream-events-prepend.js
+++ b/test/parallel/test-stream-events-prepend.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 /*<replacement>*/
 var bufferShim = require('safe-buffer').Buffer;
@@ -25,17 +29,17 @@ var common = require('../common');
 
 var stream = require('../../');
 
-var Writable =
-/*#__PURE__*/
-function (_stream$Writable) {
+var Writable = /*#__PURE__*/function (_stream$Writable) {
   _inherits(Writable, _stream$Writable);
 
+  var _super = _createSuper(Writable);
+
   function Writable() {
     var _this;
 
     _classCallCheck(this, Writable);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(Writable).call(this));
+    _this = _super.call(this);
     _this.prependListener = undefined;
     return _this;
   }
@@ -50,15 +54,15 @@ function (_stream$Writable) {
   return Writable;
 }(stream.Writable);
 
-var Readable =
-/*#__PURE__*/
-function (_stream$Readable) {
+var Readable = /*#__PURE__*/function (_stream$Readable) {
   _inherits(Readable, _stream$Readable);
 
+  var _super2 = _createSuper(Readable);
+
   function Readable() {
     _classCallCheck(this, Readable);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(Readable).apply(this, arguments));
+    return _super2.apply(this, arguments);
   }
 
   _createClass(Readable, [{
diff --git a/test/parallel/test-stream-pipe-after-end.js b/test/parallel/test-stream-pipe-after-end.js
index 5e39fce11d..f44ef0951f 100644
--- a/test/parallel/test-stream-pipe-after-end.js
+++ b/test/parallel/test-stream-pipe-after-end.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -50,17 +54,17 @@ var Readable = require('../../lib/_stream_readable');
 
 var Writable = require('../../lib/_stream_writable');
 
-var TestReadable =
-/*#__PURE__*/
-function (_Readable) {
+var TestReadable = /*#__PURE__*/function (_Readable) {
   _inherits(TestReadable, _Readable);
 
+  var _super = _createSuper(TestReadable);
+
   function TestReadable(opt) {
     var _this;
 
     _classCallCheck(this, TestReadable);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestReadable).call(this, opt));
+    _this = _super.call(this, opt);
     _this._ended = false;
     return _this;
   }
@@ -77,17 +81,17 @@ function (_Readable) {
   return TestReadable;
 }(Readable);
 
-var TestWritable =
-/*#__PURE__*/
-function (_Writable) {
+var TestWritable = /*#__PURE__*/function (_Writable) {
   _inherits(TestWritable, _Writable);
 
+  var _super2 = _createSuper(TestWritable);
+
   function TestWritable(opt) {
     var _this2;
 
     _classCallCheck(this, TestWritable);
 
-    _this2 = _possibleConstructorReturn(this, _getPrototypeOf(TestWritable).call(this, opt));
+    _this2 = _super2.call(this, opt);
     _this2._written = [];
     return _this2;
   }
diff --git a/test/parallel/test-stream-pipe-await-drain-manual-resume.js b/test/parallel/test-stream-pipe-await-drain-manual-resume.js
index aacd62cdf7..5ace908fc1 100644
--- a/test/parallel/test-stream-pipe-await-drain-manual-resume.js
+++ b/test/parallel/test-stream-pipe-await-drain-manual-resume.js
@@ -1,5 +1,11 @@
 "use strict";
 
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
 /*<replacement>*/
 var bufferShim = require('safe-buffer').Buffer;
 /*</replacement>*/
@@ -46,28 +52,19 @@ readable.once('pause', common.mustCall(function () {
     // should be flushed.
 
     isCurrentlyBufferingWrites = false;
-    var _iteratorNormalCompletion = true;
-    var _didIteratorError = false;
-    var _iteratorError = undefined;
+
+    var _iterator = _createForOfIteratorHelper(queue),
+        _step;
 
     try {
-      for (var _iterator = queue[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+      for (_iterator.s(); !(_step = _iterator.n()).done;) {
         var queued = _step.value;
         queued.cb();
       }
     } catch (err) {
-      _didIteratorError = true;
-      _iteratorError = err;
+      _iterator.e(err);
     } finally {
-      try {
-        if (!_iteratorNormalCompletion && _iterator.return != null) {
-          _iterator.return();
-        }
-      } finally {
-        if (_didIteratorError) {
-          throw _iteratorError;
-        }
-      }
+      _iterator.f();
     }
   }));
 }));
diff --git a/test/parallel/test-stream-pipe-multiple-pipes.js b/test/parallel/test-stream-pipe-multiple-pipes.js
index 011923a043..1bee44d574 100644
--- a/test/parallel/test-stream-pipe-multiple-pipes.js
+++ b/test/parallel/test-stream-pipe-multiple-pipes.js
@@ -1,5 +1,11 @@
 "use strict";
 
+function _createForOfIteratorHelper(o) { if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (o = _unsupportedIterableToArray(o))) { var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var it, normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
 /*<replacement>*/
 var bufferShim = require('safe-buffer').Buffer;
 /*</replacement>*/
@@ -38,30 +44,20 @@ readable.push(input); // The pipe() calls will postpone emission of the 'resume'
 // so no data will be available to the writable streams until then.
 
 process.nextTick(common.mustCall(function () {
-  var _iteratorNormalCompletion = true;
-  var _didIteratorError = false;
-  var _iteratorError = undefined;
+  var _iterator = _createForOfIteratorHelper(writables),
+      _step;
 
   try {
-    for (var _iterator = writables[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+    for (_iterator.s(); !(_step = _iterator.n()).done;) {
       var target = _step.value;
       assert.deepStrictEqual(target.output, [input]);
       target.on('unpipe', common.mustCall());
       readable.unpipe(target);
     }
   } catch (err) {
-    _didIteratorError = true;
-    _iteratorError = err;
+    _iterator.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion && _iterator.return != null) {
-        _iterator.return();
-      }
-    } finally {
-      if (_didIteratorError) {
-        throw _iteratorError;
-      }
-    }
+    _iterator.f();
   }
 
   readable.push('something else'); // This does not get through.
@@ -70,28 +66,18 @@ process.nextTick(common.mustCall(function () {
   readable.resume(); // Make sure the 'end' event gets emitted.
 }));
 readable.on('end', common.mustCall(function () {
-  var _iteratorNormalCompletion2 = true;
-  var _didIteratorError2 = false;
-  var _iteratorError2 = undefined;
+  var _iterator2 = _createForOfIteratorHelper(writables),
+      _step2;
 
   try {
-    for (var _iterator2 = writables[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+    for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
       var target = _step2.value;
       assert.deepStrictEqual(target.output, [input]);
     }
   } catch (err) {
-    _didIteratorError2 = true;
-    _iteratorError2 = err;
+    _iterator2.e(err);
   } finally {
-    try {
-      if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
-        _iterator2.return();
-      }
-    } finally {
-      if (_didIteratorError2) {
-        throw _iteratorError2;
-      }
-    }
+    _iterator2.f();
   }
 }));
 ;
diff --git a/test/parallel/test-stream-push-strings.js b/test/parallel/test-stream-push-strings.js
index f2555d6241..c56c1ae817 100644
--- a/test/parallel/test-stream-push-strings.js
+++ b/test/parallel/test-stream-push-strings.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -48,17 +52,17 @@ var assert = require('assert/');
 
 var Readable = require('../../').Readable;
 
-var MyStream =
-/*#__PURE__*/
-function (_Readable) {
+var MyStream = /*#__PURE__*/function (_Readable) {
   _inherits(MyStream, _Readable);
 
+  var _super = _createSuper(MyStream);
+
   function MyStream(options) {
     var _this;
 
     _classCallCheck(this, MyStream);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(MyStream).call(this, options));
+    _this = _super.call(this, options);
     _this._chunks = 3;
     return _this;
   }
diff --git a/test/parallel/test-stream-readable-async-iterators.js b/test/parallel/test-stream-readable-async-iterators.js
index d97cb866bc..2d6b526402 100644
--- a/test/parallel/test-stream-readable-async-iterators.js
+++ b/test/parallel/test-stream-readable-async-iterators.js
@@ -207,7 +207,7 @@ function _tests() {
 
       var iterator = _readable4[Symbol.asyncIterator]();
 
-      var err = new Error('kaboom');
+      var _err = new Error('kaboom');
 
       _readable4.destroy(new Error('kaboom'));
 
@@ -223,7 +223,7 @@ function _tests() {
 
           assert.strictEqual(e.message, e2.message);
         });
-      }(iterator.next.bind(iterator), err);
+      }(iterator.next.bind(iterator), _err);
     }
     {
       console.log('read object mode');
@@ -280,7 +280,7 @@ function _tests() {
         }
       });
 
-      var _err;
+      var _err2;
 
       try {
         // eslint-disable-next-line no-unused-vars
@@ -308,10 +308,10 @@ function _tests() {
           }
         }
       } catch (e) {
-        _err = e;
+        _err2 = e;
       }
 
-      assert.strictEqual(_err.message, 'kaboom from read');
+      assert.strictEqual(_err2.message, 'kaboom from read');
     }
     {
       console.log('destroy async');
@@ -332,7 +332,7 @@ function _tests() {
       });
 
       var _received = 0;
-      var _err2 = null;
+      var _err3 = null;
 
       try {
         // eslint-disable-next-line no-unused-vars
@@ -361,10 +361,10 @@ function _tests() {
           }
         }
       } catch (e) {
-        _err2 = e;
+        _err3 = e;
       }
 
-      assert.strictEqual(_err2.message, 'kaboom');
+      assert.strictEqual(_err3.message, 'kaboom');
       assert.strictEqual(_received, 1);
     }
     {
@@ -377,7 +377,7 @@ function _tests() {
         }
       });
 
-      var _err3 = null;
+      var _err4 = null;
 
       try {
         var _iteratorNormalCompletion5 = true;
@@ -406,10 +406,10 @@ function _tests() {
           }
         }
       } catch (e) {
-        _err3 = e;
+        _err4 = e;
       }
 
-      assert.strictEqual(_err3.message, 'kaboom');
+      assert.strictEqual(_err4.message, 'kaboom');
       assert.strictEqual(_readable8.destroyed, true);
     }
     {
@@ -424,7 +424,7 @@ function _tests() {
       });
 
       var _received2 = 0;
-      var _err4 = null;
+      var _err5 = null;
 
       try {
         var _iteratorNormalCompletion6 = true;
@@ -453,10 +453,10 @@ function _tests() {
           }
         }
       } catch (e) {
-        _err4 = e;
+        _err5 = e;
       }
 
-      assert.strictEqual(_err4.message, 'kaboom');
+      assert.strictEqual(_err5.message, 'kaboom');
       assert.strictEqual(_received2, 1);
     }
     {
@@ -575,8 +575,8 @@ function _tests() {
 
       _readable12.destroy();
 
-      var _ref = yield _readable12[Symbol.asyncIterator]().next(),
-          done = _ref.done;
+      var _yield$_readable12$Sy = yield _readable12[Symbol.asyncIterator]().next(),
+          done = _yield$_readable12$Sy.done;
 
       assert.strictEqual(done, true);
     }
@@ -590,18 +590,18 @@ function _tests() {
 
       var passthrough = new PassThrough();
 
-      var _err5 = new Error('kaboom');
+      var _err6 = new Error('kaboom');
 
       pipeline(_readable13, passthrough, common.mustCall(function (e) {
-        assert.strictEqual(e, _err5);
+        assert.strictEqual(e, _err6);
       }));
 
-      _readable13.destroy(_err5);
+      _readable13.destroy(_err6);
 
       try {
         yield _readable13[Symbol.asyncIterator]().next();
       } catch (e) {
-        assert.strictEqual(e, _err5);
+        assert.strictEqual(e, _err6);
       }
     }
     {
@@ -718,11 +718,11 @@ function _tests() {
 
       _r2.push(null);
 
-      assert.deepStrictEqual((yield c), {
+      assert.deepStrictEqual(yield c, {
         done: true,
         value: undefined
       });
-      assert.deepStrictEqual((yield _d), {
+      assert.deepStrictEqual(yield _d, {
         done: true,
         value: undefined
       });
@@ -743,11 +743,11 @@ function _tests() {
 
       _r3.destroy();
 
-      assert.deepStrictEqual((yield _c), {
+      assert.deepStrictEqual(yield _c, {
         done: true,
         value: undefined
       });
-      assert.deepStrictEqual((yield _d2), {
+      assert.deepStrictEqual(yield _d2, {
         done: true,
         value: undefined
       });
@@ -766,9 +766,9 @@ function _tests() {
 
       var _d3 = _b3.next();
 
-      var _err6 = new Error('kaboom');
+      var _err7 = new Error('kaboom');
 
-      _r4.destroy(_err6);
+      _r4.destroy(_err7);
 
       yield Promise.all([_asyncToGenerator(function* () {
         var e;
@@ -779,7 +779,7 @@ function _tests() {
           e = _e;
         }
 
-        assert.strictEqual(e, _err6);
+        assert.strictEqual(e, _err7);
       })(), _asyncToGenerator(function* () {
         var e;
 
@@ -789,7 +789,7 @@ function _tests() {
           e = _e;
         }
 
-        assert.strictEqual(e, _err6);
+        assert.strictEqual(e, _err7);
       })()]);
     }
   });
diff --git a/test/parallel/test-stream-uint8array.js b/test/parallel/test-stream-uint8array.js
index b5b767270c..86b509ff55 100644
--- a/test/parallel/test-stream-uint8array.js
+++ b/test/parallel/test-stream-uint8array.js
@@ -1,12 +1,16 @@
 "use strict";
 
-function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
 
-function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance"); }
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
 
-function _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter); }
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
 
-function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); }
+
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
 
 /*<replacement>*/
 var bufferShim = require('safe-buffer').Buffer;
diff --git a/test/parallel/test-stream-unpipe-event.js b/test/parallel/test-stream-unpipe-event.js
index 797e03182d..65e0693d9c 100644
--- a/test/parallel/test-stream-unpipe-event.js
+++ b/test/parallel/test-stream-unpipe-event.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 if (process.version.indexOf('v0.8') === 0) {
   process.exit(0);
@@ -34,15 +38,15 @@ var _require = require('../../'),
     Writable = _require.Writable,
     Readable = _require.Readable;
 
-var NullWriteable =
-/*#__PURE__*/
-function (_Writable) {
+var NullWriteable = /*#__PURE__*/function (_Writable) {
   _inherits(NullWriteable, _Writable);
 
+  var _super = _createSuper(NullWriteable);
+
   function NullWriteable() {
     _classCallCheck(this, NullWriteable);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(NullWriteable).apply(this, arguments));
+    return _super.apply(this, arguments);
   }
 
   _createClass(NullWriteable, [{
@@ -55,15 +59,15 @@ function (_Writable) {
   return NullWriteable;
 }(Writable);
 
-var QuickEndReadable =
-/*#__PURE__*/
-function (_Readable) {
+var QuickEndReadable = /*#__PURE__*/function (_Readable) {
   _inherits(QuickEndReadable, _Readable);
 
+  var _super2 = _createSuper(QuickEndReadable);
+
   function QuickEndReadable() {
     _classCallCheck(this, QuickEndReadable);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(QuickEndReadable).apply(this, arguments));
+    return _super2.apply(this, arguments);
   }
 
   _createClass(QuickEndReadable, [{
@@ -76,15 +80,15 @@ function (_Readable) {
   return QuickEndReadable;
 }(Readable);
 
-var NeverEndReadable =
-/*#__PURE__*/
-function (_Readable2) {
+var NeverEndReadable = /*#__PURE__*/function (_Readable2) {
   _inherits(NeverEndReadable, _Readable2);
 
+  var _super3 = _createSuper(NeverEndReadable);
+
   function NeverEndReadable() {
     _classCallCheck(this, NeverEndReadable);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(NeverEndReadable).apply(this, arguments));
+    return _super3.apply(this, arguments);
   }
 
   _createClass(NeverEndReadable, [{
diff --git a/test/parallel/test-stream-writable-change-default-encoding.js b/test/parallel/test-stream-writable-change-default-encoding.js
index 441dc637e5..b57d9e2085 100644
--- a/test/parallel/test-stream-writable-change-default-encoding.js
+++ b/test/parallel/test-stream-writable-change-default-encoding.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -48,17 +52,17 @@ var assert = require('assert/');
 
 var stream = require('../../');
 
-var MyWritable =
-/*#__PURE__*/
-function (_stream$Writable) {
+var MyWritable = /*#__PURE__*/function (_stream$Writable) {
   _inherits(MyWritable, _stream$Writable);
 
+  var _super = _createSuper(MyWritable);
+
   function MyWritable(fn, options) {
     var _this;
 
     _classCallCheck(this, MyWritable);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(MyWritable).call(this, options));
+    _this = _super.call(this, options);
     _this.fn = fn;
     return _this;
   }
diff --git a/test/parallel/test-stream-writable-decoded-encoding.js b/test/parallel/test-stream-writable-decoded-encoding.js
index 1bf9ed6ea3..2b9189eebc 100644
--- a/test/parallel/test-stream-writable-decoded-encoding.js
+++ b/test/parallel/test-stream-writable-decoded-encoding.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -48,17 +52,17 @@ var assert = require('assert/');
 
 var stream = require('../../');
 
-var MyWritable =
-/*#__PURE__*/
-function (_stream$Writable) {
+var MyWritable = /*#__PURE__*/function (_stream$Writable) {
   _inherits(MyWritable, _stream$Writable);
 
+  var _super = _createSuper(MyWritable);
+
   function MyWritable(fn, options) {
     var _this;
 
     _classCallCheck(this, MyWritable);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(MyWritable).call(this, options));
+    _this = _super.call(this, options);
     _this.fn = fn;
     return _this;
   }
diff --git a/test/parallel/test-stream-writable-null.js b/test/parallel/test-stream-writable-null.js
index a6e8794a33..2ce9768b4b 100644
--- a/test/parallel/test-stream-writable-null.js
+++ b/test/parallel/test-stream-writable-null.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 /*<replacement>*/
 var bufferShim = require('safe-buffer').Buffer;
@@ -27,15 +31,15 @@ var assert = require('assert/');
 
 var stream = require('../../');
 
-var MyWritable =
-/*#__PURE__*/
-function (_stream$Writable) {
+var MyWritable = /*#__PURE__*/function (_stream$Writable) {
   _inherits(MyWritable, _stream$Writable);
 
+  var _super = _createSuper(MyWritable);
+
   function MyWritable() {
     _classCallCheck(this, MyWritable);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(MyWritable).apply(this, arguments));
+    return _super.apply(this, arguments);
   }
 
   _createClass(MyWritable, [{
diff --git a/test/parallel/test-stream2-basic.js b/test/parallel/test-stream2-basic.js
index 7a16dc3fbf..de87a4e9a9 100644
--- a/test/parallel/test-stream2-basic.js
+++ b/test/parallel/test-stream2-basic.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -50,17 +54,17 @@ var assert = require('assert/');
 
 var EE = require('events').EventEmitter;
 
-var TestReader =
-/*#__PURE__*/
-function (_R) {
+var TestReader = /*#__PURE__*/function (_R) {
   _inherits(TestReader, _R);
 
+  var _super = _createSuper(TestReader);
+
   function TestReader(n) {
     var _this;
 
     _classCallCheck(this, TestReader);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestReader).call(this));
+    _this = _super.call(this);
     _this._buffer = bufferShim.alloc(n || 100, 'x');
     _this._pos = 0;
     _this._bufs = 10;
@@ -106,17 +110,17 @@ function (_R) {
   return TestReader;
 }(R);
 
-var TestWriter =
-/*#__PURE__*/
-function (_EE) {
+var TestWriter = /*#__PURE__*/function (_EE) {
   _inherits(TestWriter, _EE);
 
+  var _super2 = _createSuper(TestWriter);
+
   function TestWriter() {
     var _this3;
 
     _classCallCheck(this, TestWriter);
 
-    _this3 = _possibleConstructorReturn(this, _getPrototypeOf(TestWriter).call(this));
+    _this3 = _super2.call(this);
     _this3.received = [];
     _this3.flush = false;
     return _this3;
diff --git a/test/parallel/test-stream2-compatibility.js b/test/parallel/test-stream2-compatibility.js
index 04ab8eeced..d24100ff18 100644
--- a/test/parallel/test-stream2-compatibility.js
+++ b/test/parallel/test-stream2-compatibility.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -52,17 +56,17 @@ var assert = require('assert/');
 
 var ondataCalled = 0;
 
-var TestReader =
-/*#__PURE__*/
-function (_R) {
+var TestReader = /*#__PURE__*/function (_R) {
   _inherits(TestReader, _R);
 
+  var _super = _createSuper(TestReader);
+
   function TestReader() {
     var _this;
 
     _classCallCheck(this, TestReader);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestReader).call(this));
+    _this = _super.call(this);
     _this._buffer = bufferShim.alloc(100, 'x');
 
     _this.on('data', function () {
@@ -92,17 +96,17 @@ setImmediate(function () {
   reader.push(null);
 });
 
-var TestWriter =
-/*#__PURE__*/
-function (_W) {
+var TestWriter = /*#__PURE__*/function (_W) {
   _inherits(TestWriter, _W);
 
+  var _super2 = _createSuper(TestWriter);
+
   function TestWriter() {
     var _this2;
 
     _classCallCheck(this, TestWriter);
 
-    _this2 = _possibleConstructorReturn(this, _getPrototypeOf(TestWriter).call(this));
+    _this2 = _super2.call(this);
 
     _this2.write('foo');
 
diff --git a/test/parallel/test-stream2-pipe-error-once-listener.js b/test/parallel/test-stream2-pipe-error-once-listener.js
index ad613095d1..7891ae6f4c 100644
--- a/test/parallel/test-stream2-pipe-error-once-listener.js
+++ b/test/parallel/test-stream2-pipe-error-once-listener.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -46,15 +50,15 @@ require('../common');
 
 var stream = require('../../');
 
-var Read =
-/*#__PURE__*/
-function (_stream$Readable) {
+var Read = /*#__PURE__*/function (_stream$Readable) {
   _inherits(Read, _stream$Readable);
 
+  var _super = _createSuper(Read);
+
   function Read() {
     _classCallCheck(this, Read);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(Read).apply(this, arguments));
+    return _super.apply(this, arguments);
   }
 
   _createClass(Read, [{
@@ -68,15 +72,15 @@ function (_stream$Readable) {
   return Read;
 }(stream.Readable);
 
-var Write =
-/*#__PURE__*/
-function (_stream$Writable) {
+var Write = /*#__PURE__*/function (_stream$Writable) {
   _inherits(Write, _stream$Writable);
 
+  var _super2 = _createSuper(Write);
+
   function Write() {
     _classCallCheck(this, Write);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(Write).apply(this, arguments));
+    return _super2.apply(this, arguments);
   }
 
   _createClass(Write, [{
diff --git a/test/parallel/test-stream2-set-encoding.js b/test/parallel/test-stream2-set-encoding.js
index d1c7c8f693..465f98602e 100644
--- a/test/parallel/test-stream2-set-encoding.js
+++ b/test/parallel/test-stream2-set-encoding.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -48,17 +52,17 @@ var assert = require('assert/');
 
 var R = require('../../lib/_stream_readable');
 
-var TestReader =
-/*#__PURE__*/
-function (_R) {
+var TestReader = /*#__PURE__*/function (_R) {
   _inherits(TestReader, _R);
 
+  var _super = _createSuper(TestReader);
+
   function TestReader(n, opts) {
     var _this;
 
     _classCallCheck(this, TestReader);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestReader).call(this, opts));
+    _this = _super.call(this, opts);
     _this.pos = 0;
     _this.len = n || 100;
     return _this;
diff --git a/test/parallel/test-stream2-unpipe-drain.js b/test/parallel/test-stream2-unpipe-drain.js
index a2e8166cf6..45814ea76d 100644
--- a/test/parallel/test-stream2-unpipe-drain.js
+++ b/test/parallel/test-stream2-unpipe-drain.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 (function () {
   // Copyright Joyent, Inc. and other Node contributors.
@@ -49,15 +53,15 @@ function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || func
 
   var stream = require('../../');
 
-  var TestWriter =
-  /*#__PURE__*/
-  function (_stream$Writable) {
+  var TestWriter = /*#__PURE__*/function (_stream$Writable) {
     _inherits(TestWriter, _stream$Writable);
 
+    var _super = _createSuper(TestWriter);
+
     function TestWriter() {
       _classCallCheck(this, TestWriter);
 
-      return _possibleConstructorReturn(this, _getPrototypeOf(TestWriter).apply(this, arguments));
+      return _super.apply(this, arguments);
     }
 
     _createClass(TestWriter, [{
@@ -72,17 +76,17 @@ function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || func
 
   var dest = new TestWriter();
 
-  var TestReader =
-  /*#__PURE__*/
-  function (_stream$Readable) {
+  var TestReader = /*#__PURE__*/function (_stream$Readable) {
     _inherits(TestReader, _stream$Readable);
 
+    var _super2 = _createSuper(TestReader);
+
     function TestReader() {
       var _this;
 
       _classCallCheck(this, TestReader);
 
-      _this = _possibleConstructorReturn(this, _getPrototypeOf(TestReader).call(this));
+      _this = _super2.call(this);
       _this.reads = 0;
       return _this;
     }
diff --git a/test/parallel/test-stream2-unpipe-leak.js b/test/parallel/test-stream2-unpipe-leak.js
index 93e26015d9..e0d40ff58f 100644
--- a/test/parallel/test-stream2-unpipe-leak.js
+++ b/test/parallel/test-stream2-unpipe-leak.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -50,15 +54,15 @@ var stream = require('../../');
 
 var chunk = bufferShim.from('hallo');
 
-var TestWriter =
-/*#__PURE__*/
-function (_stream$Writable) {
+var TestWriter = /*#__PURE__*/function (_stream$Writable) {
   _inherits(TestWriter, _stream$Writable);
 
+  var _super = _createSuper(TestWriter);
+
   function TestWriter() {
     _classCallCheck(this, TestWriter);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(TestWriter).apply(this, arguments));
+    return _super.apply(this, arguments);
   }
 
   _createClass(TestWriter, [{
@@ -74,17 +78,17 @@ function (_stream$Writable) {
 var dest = new TestWriter(); // Set this high so that we'd trigger a nextTick warning
 // and/or RangeError if we do maybeReadMore wrong.
 
-var TestReader =
-/*#__PURE__*/
-function (_stream$Readable) {
+var TestReader = /*#__PURE__*/function (_stream$Readable) {
   _inherits(TestReader, _stream$Readable);
 
+  var _super2 = _createSuper(TestReader);
+
   function TestReader() {
     _classCallCheck(this, TestReader);
 
-    return _possibleConstructorReturn(this, _getPrototypeOf(TestReader).call(this, {
+    return _super2.call(this, {
       highWaterMark: 0x10000
-    }));
+    });
   }
 
   _createClass(TestReader, [{
diff --git a/test/parallel/test-stream2-writable.js b/test/parallel/test-stream2-writable.js
index 4d38254e8d..0e70441dd2 100644
--- a/test/parallel/test-stream2-writable.js
+++ b/test/parallel/test-stream2-writable.js
@@ -6,15 +6,19 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
 function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
 
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
 
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
-
-function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
 
 // Copyright Joyent, Inc. and other Node contributors.
 //
@@ -50,17 +54,17 @@ var D = require('../../lib/_stream_duplex');
 
 var assert = require('assert/');
 
-var TestWriter =
-/*#__PURE__*/
-function (_W) {
+var TestWriter = /*#__PURE__*/function (_W) {
   _inherits(TestWriter, _W);
 
+  var _super = _createSuper(TestWriter);
+
   function TestWriter(opts) {
     var _this;
 
     _classCallCheck(this, TestWriter);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(TestWriter).call(this, opts));
+    _this = _super.call(this, opts);
     _this.buffer = [];
     _this.written = 0;
     return _this;