Transform async functions with regenerator (facebook#332)

* Transform async functions with regenerator Remove `transform-async-to-generator`, which to my understanding is meant to be used in environments that support generators natively. Because we're compiling generators to ES5 anyway, we can simply use `regenerator` to transform async functions too, which results in slightly simpler output and only uses the regenerator runtime instead regenerator runtime + _asyncToGenerator Babel helper. * Add babel-plugin-transform-regenerator * Use dependencies with an exact version

Author: fson

config/babel.dev.js

@@ -17,9 +17,10 @@ module.exports = {
  ],
  plugins: [
  require.resolve('babel-plugin-syntax-trailing-function-commas'),
- require.resolve('babel-plugin-transform-async-to-generator'),
+ require.resolve('babel-plugin-syntax-async-functions'),
  require.resolve('babel-plugin-transform-class-properties'),
  require.resolve('babel-plugin-transform-object-rest-spread'),
+ require.resolve('babel-plugin-transform-regenerator'),
  [require.resolve('babel-plugin-transform-runtime'), {
  helpers: false,
  polyfill: false,

config/babel.prod.js

@@ -16,10 +16,11 @@ module.exports = {
  ],
  plugins: [
  require.resolve('babel-plugin-syntax-trailing-function-commas'),
- require.resolve('babel-plugin-transform-async-to-generator'),
+ require.resolve('babel-plugin-syntax-async-functions'),
  require.resolve('babel-plugin-transform-class-properties'),
  require.resolve('babel-plugin-transform-object-rest-spread'),
  require.resolve('babel-plugin-transform-react-constant-elements'),
+ require.resolve('babel-plugin-transform-regenerator'),
  [require.resolve('babel-plugin-transform-runtime'), {
  helpers: false,
  polyfill: false,

package.json

@@ -33,11 +33,12 @@
  "babel-eslint": "6.1.2",
  "babel-jest": "14.1.0",
  "babel-loader": "6.2.4",
+ "babel-plugin-syntax-async-functions": "6.8.0",
  "babel-plugin-syntax-trailing-function-commas": "6.8.0",
- "babel-plugin-transform-async-to-generator": "6.8.0",
  "babel-plugin-transform-class-properties": "6.11.5",
  "babel-plugin-transform-object-rest-spread": "6.8.0",
  "babel-plugin-transform-react-constant-elements": "6.9.1",
+ "babel-plugin-transform-regenerator": "6.11.4",
  "babel-plugin-transform-runtime": "6.12.0",
  "babel-preset-es2015": "6.9.0",
  "babel-preset-es2016": "6.11.3",