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Babel 7 #16297
Merged
Babel 7 #16297
Conversation
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React: size: -0.4%, gzip: -0.2% ReactDOM: size: -0.7%, gzip: -0.7% Details of bundled changes.Comparing: d77c623...348fae3 react
react-dom
react-art
react-native-renderer
react-test-renderer
eslint-plugin-react-hooks
react-events
react-reconciler
create-subscription
Generated by |
…ere being imported
package.json
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| "babel-plugin-check-es2015-constants": "^6.5.0", | ||
| "babel-plugin-external-helpers": "^6.22.0", | ||
| "babel-plugin-syntax-dynamic-import": "^6.18.0", | ||
| "babel-jest": "^24.8.0", |
SimenB
Aug 7, 2019
Contributor
you can remove babel-jest entirely, it's not used
you can remove babel-jest entirely, it's not used
lunaruan
Aug 9, 2019
Author
Contributor
Will do. Thanks!
Will do. Thanks!
babel.config.js
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| 'use strict'; | ||
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| module.exports = { | ||
| presets: ['@babel/preset-react', '@babel/preset-flow'], |
acdlite
Aug 7, 2019
•
Member
Can we remove these presets and use the plugins directly? That way unexpected stuff can't sneak in.
Can we remove these presets and use the plugins directly? That way unexpected stuff can't sneak in.
| describe('ReactFreshBabelPlugin', () => { | ||
| beforeEach(() => { |
acdlite
Aug 7, 2019
•
Member
The reason Fresh throws an error if you're not in development environment is because the production build of React does not support hot reloading. React uses a process.env.NODE_ENV check (that's what __DEV__ compiles to), not BABEL_ENV. Technically, BABEL_ENV and NODE_ENV could be different, even though they're usually the same.
We should use __DEV__/NODE_ENV since that's what determines the version of React DOM.
if (__DEV__) {
// The tests
} else {
it('throw error if environment is not development', ...);
}
The reason Fresh throws an error if you're not in development environment is because the production build of React does not support hot reloading. React uses a process.env.NODE_ENV check (that's what __DEV__ compiles to), not BABEL_ENV. Technically, BABEL_ENV and NODE_ENV could be different, even though they're usually the same.
We should use __DEV__/NODE_ENV since that's what determines the version of React DOM.
if (__DEV__) {
// The tests
} else {
it('throw error if environment is not development', ...);
}
babel.config.js
Outdated
| plugins: [ | ||
| '@babel/plugin-syntax-jsx', | ||
| '@babel/plugin-transform-react-jsx', | ||
| '@babel/plugin-transform-react-display-name', |
acdlite
Aug 8, 2019
Member
Let's remove this one. Don't need it.
Let's remove this one. Don't need it.
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Ping me before you merge so we can make sure the commit gets attributed properly |
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Nice work @lunaruan ! |
| // fail due to obsolete snapshots | ||
| process.env.NODE_ENV === 'development' | ||
| ? '<rootDir>/packages/react-refresh/src/__tests__/ReactFreshBabelPluginProd-test.js' | ||
| : '<rootDir>/packages/react-refresh/src/__tests__/ReactFreshBabelPlugin-test.js', |
gaearon
Aug 9, 2019
Member
This is kinda hacky. Can we figure out another way without making exceptions at this level?
This is kinda hacky. Can we figure out another way without making exceptions at this level?
| @@ -134,12 +134,26 @@ const bundles = [ | |||
| entry: 'react-dom/server.browser', | |||
| global: 'ReactDOMServer', | |||
| externals: ['react'], | |||
| babel: opts => | |||
| Object.assign({}, opts, { | |||
| // Include JSX | |||
gaearon
Aug 9, 2019
•
Member
The comment doesn't match the intention.
The comment doesn't match the intention.
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I would merge this first #15037 |
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For #12548
Upgraded from Babel 6 to Babel 7.
The only significant change seems to be the way
@babel/plugin-transform-classeshandles classes differently frombabel-plugin-transform-es2015-classes. In regular mode, the former injects a_createClassfunction that increases the bundle size, and in the latter it removes the safeguard checks. However, this is okay because we don't all classes in new features, and we want to deprecate class usage in the future in the react repo.Differences between classes in Babel 6 (left) and Babel 7 (right)
Example diffs (6 on the left and 7 on the right):
ReactDOM-prod.js (facebook-www)
ReactDOM-dev.js (facebook-www)
react-dom.development.js (UMD)
react-dom.production.js (UMD)
react-dom.development.js (CommonJS)
react-dom.production.js (CommonJS)
react-dom-server.node.production.min.js (CommonJS)
react-dom-server.browser.production.min.js (UMD)