Create Fable transformer for React Native

Fixes fable-compiler#804.

src/typescript/fable-utils/client-sync.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+const net = require('net');
+const childProcess = require('child_process');
+
+if (require.main === module) {
+  const [, , port, msg] = process.argv;
+
+  let buff = '';
+
+  const c = new net.Socket();
+  c.connect({ port }, () => c.write(msg));
+
+  c.on('data', x => (buff += x));
+  // eslint-disable-next-line no-console
+  c.on('close', () => console.log(buff));
+}
+
+module.exports = args => {
+  const resp = childProcess.spawnSync('node', [
+    `${__dirname}/client.js`,
+    args.port,
+    JSON.stringify(args)
+  ]);
+
+  resp.stderr = resp.stderr.toString();
+  resp.stdout = resp.stdout.toString();
+
+  if (resp.status !== 0) throw new Error(resp.stderr);
+
+  return resp;
+};

src/typescript/fable-utils/client.js

@@ -2,42 +2,9 @@ var net = require('net');
 
 var HOST = '127.0.0.1';
 
-function getRandomInt(min, max) {
-  min = Math.ceil(min);
-  max = Math.floor(max);
-  return Math.floor(Math.random() * (max - min)) + min;
-}
-
-// From http://stackoverflow.com/a/29872303
-var isPortFree = function(port) {
-  return new Promise(function (resolve) {
-    var server = net.createServer(function(socket) {
-      socket.write('Echo server\r\n');
-      socket.pipe(socket);
-    });
-
-    server.listen(port, HOST);
-    server.on('error', function (e) {
-      resolve(false);
-    });
-
-    server.on('listening', function (e) {
-      server.close();
-      resolve(true);
-    });
-  })
-};
-
-exports.getFreePort = function(port) {
-  var port = port || getRandomInt(1000, 10000);
-  return isPortFree(port).then(res =>
-    res ? port : getFreePort()
-  );
-}
-
 exports.send = function(port, msg) {
   return new Promise((resolve, reject) => {
-    var buffer = "";
+    var buffer = '';
     var client = new net.Socket(), resolved = false;
 
     client.connect(port, HOST, function() {
@@ -62,4 +29,4 @@ exports.send = function(port, msg) {
       }
     });
   });
-}
+};

src/typescript/react-native-fable-transformer/.eslintrc

@@ -0,0 +1,43 @@
+{
+  "plugins": [
+    "prettier"
+  ],
+  "rules": {
+    "no-var": 2,
+    "linebreak-style": [
+      2,
+      "unix"
+    ],
+    "no-console": "off",
+    "curly": [
+      2,
+      "multi",
+      "consistent"
+    ],
+    "prefer-const": [
+      "error",
+      {
+        "destructuring": "all",
+        "ignoreReadBeforeAssign": false
+      }
+    ],
+    "prettier/prettier": [
+      "error",
+      {
+        "singleQuote": true
+      }
+    ]
+  },
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  },
+  "extends": [
+    "eslint:recommended",
+    "prettier"
+  ]
+}

src/typescript/react-native-fable-transformer/index.js

@@ -0,0 +1,33 @@
+// react-native start --transformer ./smTransform.js
+
+const transformer = require('react-native/packager/transformer');
+const client = require('fable-utils/client-sync');
+const babelPlugins = require('fable-utils/babel-plugins');
+const babel = require('babel-core');
+
+const isFableFile = /\.(?:fs|fsx|fsproj)$/;
+const fableCoreVersion = null;
+const DEFAULT_PORT = process.env.FABLE_SERVER_PORT != null
+  ? parseInt(process.env.FABLE_SERVER_PORT, 10)
+  : 61225;
+
+const customPlugins = [
+  babelPlugins.getRemoveUnneededNulls(),
+  babelPlugins.getTransformMacroExpressions(babel.template)
+];
+
+module.exports = (src, filename, options) => {
+  options = options || {};
+  if (isFableFile.test(filename)) {
+    if (babelOpts.sourceMaps) {
+      fsCode = src;
+      babelOpts.sourceMaps = true;
+      babelOpts.sourceFileName = relative(
+        process.cwd(),
+        fileName.replace(/\\/g, '/')
+      );
+    }
+
+    return babel.transformFromAst(data, fsCode, babelOpts).code;
+  } else {return transformer.transform(src, filename, options);}
+};

src/typescript/react-native-fable-transformer/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "react-native-fable-transformer",
+  "version": "1.0.3",
+  "description": "React Native transformer for Fable",
+  "main": "index.js",
+  "scripts": {
+    "eslint": "eslint ./"
+  },
+  "repository": "https://github.com/fable-compiler/Fable/tree/master/src/typescript/react-native-fable-transformer",
+  "publishConfig": {
+    "registry": " https://registry.npmjs.org"
+  },
+  "keywords": [
+    "react native",
+    "native",
+    "F#",
+    "transformer"
+  ],
+  "author": "Joe Grund",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/fable-compiler/Fable/issues"
+  },
+  "homepage": "https://github.com/fable-compiler/Fable/tree/master/src/typescript/react-native-fable-transformer#readme",
+  "devDependencies": {
+    "eslint": "3.19.0",
+    "eslint-config-prettier": "1.7.0",
+    "eslint-plugin-prettier": "2.0.1",
+    "prettier": "1.3.1"
+  },
+  "peerDependencies": {
+    "babel-core": "^6.24.1",
+    "fable-core": "^1.0.0-narumi-906"
+  },
+  "dependencies": {
+    "fable-utils": "^1.0.0"
+  }
+}