Skip to content

CRA_BABEL_PRESET_FILE to handle optional dependencies. #2775

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

CRA_BABEL_PRESET_FILE to handle optional dependencies. #2775

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
244 changes: 126 additions & 118 deletions packages/babel-preset-react-app/index.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,131 +8,139 @@
*/
'use strict';

const plugins = [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// The following two plugins use Object.assign directly, instead of Babel's
// extends helper. Note that this assumes `Object.assign` is available.
// { ...todo, completed: true }
[
require.resolve('babel-plugin-transform-object-rest-spread'),
{
useBuiltIns: true,
},
],
// Transforms JSX
[
require.resolve('babel-plugin-transform-react-jsx'),
{
useBuiltIns: true,
},
],
// Polyfills the runtime needed for async/await and generators
[
require.resolve('babel-plugin-transform-runtime'),
{
helpers: false,
polyfill: false,
regenerator: true,
},
],
];
const path = require('path');

// This is similar to how `env` works in Babel:
// https://babeljs.io/docs/usage/babelrc/#env-option
// We are not using `env` because it’s ignored in versions > [email protected]:
// https://github.com/babel/babel/issues/4539
// https://github.com/facebookincubator/create-react-app/issues/720
// It’s also nice that we can enforce `NODE_ENV` being specified.
var env = process.env.BABEL_ENV || process.env.NODE_ENV;
if (env !== 'development' && env !== 'test' && env !== 'production') {
throw new Error(
'Using `babel-preset-react-app` requires that you specify `NODE_ENV` or ' +
'`BABEL_ENV` environment variables. Valid values are "development", ' +
'"test", and "production". Instead, received: ' +
JSON.stringify(env) +
'.'
);
}
if (process.env.CRA_BABEL_PRESET_FILE) {
let presetFile = path.resolve(process.cwd(),
process.env.CRA_BABEL_PRESET_FILE);
module.exports = require(presetFile);
} else {
const plugins = [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// The following two plugins use Object.assign directly, instead of Babel's
// extends helper. Note that this assumes `Object.assign` is available.
// { ...todo, completed: true }
[
require.resolve('babel-plugin-transform-object-rest-spread'),
{
useBuiltIns: true,
},
],
// Transforms JSX
[
require.resolve('babel-plugin-transform-react-jsx'),
{
useBuiltIns: true,
},
],
// Polyfills the runtime needed for async/await and generators
[
require.resolve('babel-plugin-transform-runtime'),
{
helpers: false,
polyfill: false,
regenerator: true,
},
],
];

if (env === 'development' || env === 'test') {
// The following two plugins are currently necessary to make React warnings
// include more valuable information. They are included here because they are
// currently not enabled in babel-preset-react. See the below threads for more info:
// https://github.com/babel/babel/issues/4702
// https://github.com/babel/babel/pull/3540#issuecomment-228673661
// https://github.com/facebookincubator/create-react-app/issues/989
plugins.push.apply(plugins, [
// Adds component stack to warning messages
require.resolve('babel-plugin-transform-react-jsx-source'),
// Adds __self attribute to JSX which React will use for some warnings
require.resolve('babel-plugin-transform-react-jsx-self'),
]);
}
// This is similar to how `env` works in Babel:
// https://babeljs.io/docs/usage/babelrc/#env-option
// We are not using `env` because it’s ignored in versions > [email protected]:
// https://github.com/babel/babel/issues/4539
// https://github.com/facebookincubator/create-react-app/issues/720
// It’s also nice that we can enforce `NODE_ENV` being specified.
var env = process.env.BABEL_ENV || process.env.NODE_ENV;
if (env !== 'development' && env !== 'test' && env !== 'production') {
throw new Error(
'Using `babel-preset-react-app` requires that you specify `NODE_ENV` or ' +
'`BABEL_ENV` environment variables. Valid values are "development", ' +
'"test", and "production". Instead, received: ' +
JSON.stringify(env) +
'.'
);
}

if (env === 'test') {
module.exports = {
presets: [
// ES features necessary for user's Node version
[
require('babel-preset-env').default,
{
targets: {
node: 'current',
if (env === 'development' || env === 'test') {
// The following two plugins are currently necessary to make React warnings
// include more valuable information. They are included here because they are
// currently not enabled in babel-preset-react. See the below threads for more info:
// https://github.com/babel/babel/issues/4702
// https://github.com/babel/babel/pull/3540#issuecomment-228673661
// https://github.com/facebookincubator/create-react-app/issues/989
plugins.push.apply(plugins, [
// Adds component stack to warning messages
require.resolve('babel-plugin-transform-react-jsx-source'),
// Adds __self attribute to JSX which React will use for some warnings
require.resolve('babel-plugin-transform-react-jsx-self'),
]);
}

if (env === 'test') {
module.exports = {
presets: [
// ES features necessary for user's Node version
[
require('babel-preset-env').default,
{
targets: {
node: 'current',
},
},
},
],
// JSX, Flow
require.resolve('babel-preset-react'),
],
// JSX, Flow
require.resolve('babel-preset-react'),
],
plugins: plugins.concat([
// Compiles import() to a deferred require()
require.resolve('babel-plugin-dynamic-import-node'),
]),
};
} else {
module.exports = {
presets: [
// Latest stable ECMAScript features
[
require.resolve('babel-preset-env'),
{
targets: {
// React parses on ie 9, so we should too
ie: 9,
// We currently minify with uglify
// Remove after https://github.com/mishoo/UglifyJS2/issues/448
uglify: true,
plugins: plugins.concat([
// Compiles import() to a deferred require()
require.resolve('babel-plugin-dynamic-import-node'),
]),
};
} else {
module.exports = {
presets: [
// Latest stable ECMAScript features
[
require.resolve('babel-preset-env'),
{
targets: {
// React parses on ie 9, so we should too
ie: 9,
// We currently minify with uglify
// Remove after https://github.com/mishoo/UglifyJS2/issues/448
uglify: true,
},
// Disable polyfill transforms
useBuiltIns: false,
// Do not transform modules to CJS
modules: false,
},
// Disable polyfill transforms
useBuiltIns: false,
// Do not transform modules to CJS
modules: false,
},
],
// JSX, Flow
require.resolve('babel-preset-react'),
],
// JSX, Flow
require.resolve('babel-preset-react'),
],
plugins: plugins.concat([
// function* () { yield 42; yield 43; }
[
require.resolve('babel-plugin-transform-regenerator'),
{
// Async functions are converted to generators by babel-preset-env
async: false,
},
],
// Adds syntax support for import()
require.resolve('babel-plugin-syntax-dynamic-import'),
]),
};
plugins: plugins.concat([
// function* () { yield 42; yield 43; }
[
require.resolve('babel-plugin-transform-regenerator'),
{
// Async functions are converted to generators by babel-preset-env
async: false,
},
],
// Adds syntax support for import()
require.resolve('babel-plugin-syntax-dynamic-import'),
]),
};

if (env === 'production') {
// Optimization: hoist JSX that never changes out of render()
// Disabled because of issues: https://github.com/facebookincubator/create-react-app/issues/553
// TODO: Enable again when these issues are resolved.
// plugins.push.apply(plugins, [
// require.resolve('babel-plugin-transform-react-constant-elements')
// ]);
if (env === 'production') {
// Optimization: hoist JSX that never changes out of render()
// Disabled because of issues: https://github.com/facebookincubator/create-react-app/issues/553
// TODO: Enable again when these issues are resolved.
// plugins.push.apply(plugins, [
// require.resolve('babel-plugin-transform-react-constant-elements')
// ]);
}
}
}
3 changes: 2 additions & 1 deletion packages/react-scripts/template/README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1750,7 +1750,7 @@ If you’re using [Apache HTTP Server](https://httpd.apache.org/), you need to c
RewriteRule ^ index.html [QSA,L]
```

It will get copied to the `build` folder when you run `npm run build`.
It will get copied to the `build` folder when you run `npm run build`.

If you’re using [Apache Tomcat](http://tomcat.apache.org/), you need to follow [this Stack Overflow answer](https://stackoverflow.com/a/41249464/4878474).

Expand Down Expand Up @@ -2043,6 +2043,7 @@ HTTPS | :white_check_mark: | :x: | When set to `true`, Create React App will run
PUBLIC_URL | :x: | :white_check_mark: | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included). This may be particularly useful when using a CDN to host your application.
CI | :large_orange_diamond: | :white_check_mark: | When set to `true`, Create React App treats warnings as failures in the build. It also makes the test runner non-watching. Most CIs set this flag by default.
REACT_EDITOR | :white_check_mark: | :x: | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebookincubator/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](https://en.wikipedia.org/wiki/PATH_(variable)) environment variable points to your editor’s bin folder.
CRA_BABEL_PRESET_FILE | :white_check_mark: | :x: | If you need to modify the babel preset file without ejecting you can set this to a project relative file path e.g. `CRA_BABEL_PRESET_FILE=.babel-preset-react-app.js`. Doing so is needed for optional dependencies like Typescript or relay (see [facebookincubator/create-react-app#2775](https://github.com/facebookincubator/create-react-app/pull/2775)).

## Troubleshooting

Expand Down