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babel.config.js
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babel.config.js
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require('dotenv').config();
const defaultPresets = ['@babel/preset-react', '@babel/preset-env', '@babel/preset-flow', '@babel/preset-typescript'];
const defaultPlugins = [
// Adding the commonjs: true option to react-native-web plugin can cause styling conflicts
['react-native-web'],
'@babel/transform-runtime',
'@babel/plugin-proposal-class-properties',
// We use `transform-class-properties` for transforming ReactNative libraries and do not use it for our own
// source code transformation as we do not use class property assignment.
'transform-class-properties',
// Keep it last
'react-native-reanimated/plugin',
];
const webpack = {
presets: defaultPresets,
plugins: defaultPlugins,
};
const metro = {
presets: [require('@react-native/babel-preset')],
plugins: [
// This is needed due to a react-native bug: https://github.com/facebook/react-native/issues/29084#issuecomment-1030732709
// It is included in metro-react-native-babel-preset but needs to be before plugin-proposal-class-properties or FlatList will break
'@babel/plugin-transform-flow-strip-types',
['@babel/plugin-proposal-class-properties', {loose: true}],
['@babel/plugin-proposal-private-methods', {loose: true}],
['@babel/plugin-proposal-private-property-in-object', {loose: true}],
// The reanimated babel plugin needs to be last, as stated here: https://docs.swmansion.com/react-native-reanimated/docs/fundamentals/installation
'react-native-reanimated/plugin',
// Import alias for native devices
[
'module-resolver',
{
extensions: [
'.native.js',
'.native.jsx',
'.native.ts',
'.native.tsx',
'.js',
'.jsx',
'.ts',
'.tsx',
'.ios.js',
'.ios.jsx',
'.ios.ts',
'.ios.tsx',
'.android.js',
'.android.jsx',
'.android.ts',
'.android.tx',
],
alias: {
'@assets': './assets',
'@components': './src/components',
'@hooks': './src/hooks',
'@libs': './src/libs',
'@navigation': './src/libs/Navigation',
'@pages': './src/pages',
'@styles': './src/styles',
// This path is provide alias for files like `ONYXKEYS` and `CONST`.
'@src': './src',
'@userActions': './src/libs/actions',
},
},
],
],
env: {
production: {
plugins: [['transform-remove-console', {exclude: ['error', 'warn']}]],
},
},
};
/*
* We use Flipper, <React.Profiler> and react-native-performance to capture/monitor stats
* By default <React.Profiler> is disabled in production as it adds small overhead
* When CAPTURE_METRICS is set we're explicitly saying that we want to capture metrics
* To enable the <Profiler> for release builds we add these aliases */
if (process.env.CAPTURE_METRICS === 'true') {
const path = require('path');
const profilingRenderer = path.resolve(__dirname, './node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-profiling');
metro.plugins.push([
'module-resolver',
{
root: ['./'],
alias: {
'ReactNativeRenderer-prod': profilingRenderer,
'scheduler/tracing': 'scheduler/tracing-profiling',
},
},
'extra-alias',
]);
}
module.exports = (api) => {
console.debug('babel.config.js');
console.debug(' - api.version:', api.version);
console.debug(' - api.env:', api.env());
console.debug(' - process.env.NODE_ENV:', process.env.NODE_ENV);
console.debug(' - process.env.BABEL_ENV:', process.env.BABEL_ENV);
// For `react-native` (iOS/Android) caller will be "metro"
// For `webpack` (Web) caller will be "@babel-loader"
// For jest, it will be babel-jest
// For `storybook` there won't be any config at all so we must give default argument of an empty object
const runningIn = api.caller((args = {}) => args.name);
console.debug(' - running in: ', runningIn);
return ['metro', 'babel-jest'].includes(runningIn) ? metro : webpack;
};