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Support async/await #327

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merged 2 commits into from
Aug 2, 2016
Merged

Support async/await #327

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9a4f1d0
Make Babel config more verbose and simpler
gaearon Aug 2, 2016
02c3ed1
Support async/await
gaearon Aug 2, 2016
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18 changes: 9 additions & 9 deletions config/babel.dev.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,19 +11,19 @@ module.exports = {
babelrc: false,
cacheDirectory: true,
presets: [
'babel-preset-es2015',
'babel-preset-es2016',
'babel-preset-react'
].map(require.resolve),
require.resolve('babel-preset-es2015'),
require.resolve('babel-preset-es2016'),
require.resolve('babel-preset-react')
],
plugins: [
'babel-plugin-syntax-trailing-function-commas',
'babel-plugin-transform-class-properties',
'babel-plugin-transform-object-rest-spread'
].map(require.resolve).concat([
require.resolve('babel-plugin-syntax-trailing-function-commas'),
require.resolve('babel-plugin-transform-async-to-generator'),
require.resolve('babel-plugin-transform-class-properties'),
require.resolve('babel-plugin-transform-object-rest-spread'),
[require.resolve('babel-plugin-transform-runtime'), {
helpers: false,
polyfill: false,
regenerator: true
}]
])
]
};
20 changes: 10 additions & 10 deletions config/babel.prod.js
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Expand Up @@ -10,20 +10,20 @@
module.exports = {
babelrc: false,
presets: [
'babel-preset-es2015',
'babel-preset-es2016',
'babel-preset-react'
].map(require.resolve),
require.resolve('babel-preset-es2015'),
require.resolve('babel-preset-es2016'),
require.resolve('babel-preset-react')
],
plugins: [
'babel-plugin-syntax-trailing-function-commas',
'babel-plugin-transform-class-properties',
'babel-plugin-transform-object-rest-spread',
'babel-plugin-transform-react-constant-elements',
].map(require.resolve).concat([
require.resolve('babel-plugin-syntax-trailing-function-commas'),
require.resolve('babel-plugin-transform-async-to-generator'),
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Out of curiosity, is there a reason we use transform-async-to-generator to first transform async functions to generators and then regenerator to transform them to ES5? (Regenerator can also transform async functions directly, in which case the async-to-generator won't be needed.)

I've tested the Regenerator-only solution with following config:

    require.resolve('babel-plugin-syntax-async-functions'),
    [require.resolve('babel-plugin-transform-regenerator'), {
      asyncGenerators: false,
      generators: true,
      async: true
    }],

and it compiled to more or less the same code except it uses only the regenerator runtime and not the _asyncToGenerator helper from Babel. I don't know, if there are some minor differences in the runtime behaviour of these alternatives.

If you want to switch, I can send a pull request with this config I have.

P.S. It's very cool to have async/await supported by create-react-app! This was the reason I had to eject my config and I've been planning to make a PR to add them, but you beat me to it 😎

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Yeah, PR would be welcome. I had no idea what’s the right way to integrate this. 😄

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-runtime'), {
helpers: false,
polyfill: false,
regenerator: true
}]
])
]
};
1 change: 1 addition & 0 deletions package.json
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Expand Up @@ -34,6 +34,7 @@
"babel-jest": "14.1.0",
"babel-loader": "6.2.4",
"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",
Expand Down