MissingObserver polyfill for jest environment

Referenced from noVNC (@novnc/nvnc/core/util/events.js).

Workaround for the `jest` testing only - the MutationObserver
is available in browsers.

Use of `browser` for jest configuration option did not help here.

package.json

@@ -72,6 +72,7 @@
     "lerna-semantic-release": "^9.1.0",
     "lint-staged": "^7.0.4",
     "lodash": "^4.17.0",
+    "mutation-observer": "^1.0.3",
     "node-sass": "^4.8.3",
     "prettier": "^1.11.1",
     "prettier-eslint": "^8.8.1",

test.env.js

@@ -2,4 +2,10 @@ import 'raf/polyfill';
 import { configure } from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 
+const MutationObserverPolyfill = require('mutation-observer');
+
+// referenced from '@novnc/nvnc/core/util/events.js'
+// The MutationObserver is available in supported browsers, this is workaround for "jest"
+global.MutationObserver = global.MutationObserver || MutationObserverPolyfill;
+
 configure({ adapter: new Adapter() });

yarn.lock

@@ -2351,8 +2351,8 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
 
 c3@^0.4.11, c3@~0.4.11:
-  version "0.4.22"
-  resolved "https://registry.yarnpkg.com/c3/-/c3-0.4.22.tgz#88b895f06fb6b44314e94b2d7331c3dc98b64d2d"
+  version "0.4.18"
+  resolved "https://registry.npmjs.org/c3/-/c3-0.4.18.tgz#6f1c4409635263b8a3de607edbab4bdc678c62cb"
   dependencies:
     d3 "~3.5.0"
 
@@ -6952,16 +6952,16 @@ js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
-js-yaml@^3.4.3, js-yaml@^3.6.1, js-yaml@^3.7.0, js-yaml@^3.9.0, js-yaml@^3.9.1:
+js-yaml@^3.4.3, js-yaml@^3.7.0, js-yaml@^3.9.0, js-yaml@^3.9.1:
   version "3.11.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
+  resolved "https://registry.npmjs.org/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
-js-yaml@~3.7.0:
+js-yaml@^3.6.1, js-yaml@~3.7.0:
   version "3.7.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.7.0.tgz#5c967ddd837a9bfdca5f2de84253abe8a1c03b80"
+  resolved "https://registry.npmjs.org/js-yaml/-/js-yaml-3.7.0.tgz#5c967ddd837a9bfdca5f2de84253abe8a1c03b80"
   dependencies:
     argparse "^1.0.7"
     esprima "^2.6.0"
@@ -8103,7 +8103,15 @@ moment-timezone@^0.4.0, moment-timezone@^0.4.1:
   dependencies:
     moment ">= 2.6.0"
 
-"moment@>= 2.6.0", moment@^2.10, moment@^2.19.1, moment@^2.21.0, moment@^2.6.0:
+"moment@>= 2.6.0", moment@^2.10, moment@^2.21.0:
+  version "2.22.0"
+  resolved "https://registry.npmjs.org/moment/-/moment-2.22.0.tgz#7921ade01017dd45186e7fee5f424f0b8663a730"
+
+moment@^2.19.1:
+  version "2.20.1"
+  resolved "https://registry.npmjs.org/moment/-/moment-2.20.1.tgz#d6eb1a46cbcc14a2b2f9434112c1ff8907f313fd"
+
+moment@^2.6.0:
   version "2.22.1"
   resolved "https://registry.yarnpkg.com/moment/-/moment-2.22.1.tgz#529a2e9bf973f259c9643d237fda84de3a26e8ad"
 
@@ -8126,6 +8134,10 @@ [email protected]:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
 
+mutation-observer@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/mutation-observer/-/mutation-observer-1.0.3.tgz#42e9222b101bca82e5ba9d5a7acf4a14c0f263d0"
+
 [email protected]:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.6.tgz#48962b19e169fd1dfc240b3f1e7317627bbc47db"
@@ -10095,16 +10107,16 @@ read-pkg@^3.0.0:
     normalize-package-data "^2.3.2"
     path-type "^3.0.0"
 
-"readable-stream@1 || 2", readable-stream@^2.0.0, "readable-stream@^2.0.0 || ^1.1.13", readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.3:
-  version "2.3.6"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
+"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.3:
+  version "2.3.5"
+  resolved "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.5.tgz#b4f85003a938cbb6ecbce2a124fb1012bd1a838d"
   dependencies:
     core-util-is "~1.0.0"
     inherits "~2.0.3"
     isarray "~1.0.0"
     process-nextick-args "~2.0.0"
     safe-buffer "~5.1.1"
-    string_decoder "~1.1.1"
+    string_decoder "~1.0.3"
     util-deprecate "~1.0.1"
 
 [email protected]:
@@ -10116,6 +10128,18 @@ [email protected]:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
+"readable-stream@^2.0.0 || ^1.1.13":
+  version "2.3.6"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.3"
+    isarray "~1.0.0"
+    process-nextick-args "~2.0.0"
+    safe-buffer "~5.1.1"
+    string_decoder "~1.1.1"
+    util-deprecate "~1.0.1"
+
 readable-stream@~2.0.5:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.0.6.tgz#8f90341e68a53ccc928788dacfcd11b36eb9b78e"
@@ -11415,7 +11439,13 @@ string_decoder@^1.0.0, string_decoder@~1.1.1:
 
 string_decoder@~0.10.x:
   version "0.10.31"
-  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-0.10.31.tgz#62e203bc41766c6c28c9fc84301dab1c5310fa94"
+  resolved "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz#62e203bc41766c6c28c9fc84301dab1c5310fa94"
+
+string_decoder@~1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.0.3.tgz#0fc67d7c141825de94282dd536bec6b9bce860ab"
+  dependencies:
+    safe-buffer "~5.1.0"
 
 stringify-entities@^1.0.1:
   version "1.3.2"