128 lines
4.5 KiB
JavaScript
128 lines
4.5 KiB
JavaScript
const lazyImportsBlacklist = require('./lazy-imports-blacklist');
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module.exports = function(api, options = {}) {
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const { web = {}, native = {} } = options;
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const bundler = api.caller(getBundler);
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const isWebpack = bundler === 'webpack';
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let platform = api.caller(getPlatform);
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// If the `platform` prop is not defined then this must be a custom config that isn't
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// defining a platform in the babel-loader. Currently this may happen with Next.js + Expo web.
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if (!platform && isWebpack) {
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platform = 'web';
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}
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const platformOptions =
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platform === 'web'
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? { disableImportExportTransform: true, ...web }
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: { disableImportExportTransform: false, ...native };
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// Note that if `options.lazyImports` is not set (i.e., `null` or `undefined`),
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// `metro-react-native-babel-preset` will handle it.
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const lazyImportsOption = options && options.lazyImports;
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return {
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presets: [
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[
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// We use `require` here instead of directly using the package name because we want to
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// specifically use the `metro-react-native-babel-preset` installed by this package (ex:
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// `babel-preset-expo/node_modules/`). This way the preset will not change unintentionally.
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// Reference: https://github.com/expo/expo/pull/4685#discussion_r307143920
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require('metro-react-native-babel-preset'),
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{
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// Defaults to undefined, set to something truthy to disable `@babel/plugin-transform-react-jsx-self` and `@babel/plugin-transform-react-jsx-source`.
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withDevTools: platformOptions.withDevTools,
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// Defaults to undefined, set to `true` to disable `@babel/plugin-transform-flow-strip-types`
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disableFlowStripTypesTransform: platformOptions.disableFlowStripTypesTransform,
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// Defaults to undefined, set to `false` to disable `@babel/plugin-transform-runtime`
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enableBabelRuntime: platformOptions.enableBabelRuntime,
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// Defaults to `'default'`, can also use `'hermes-canary'`
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unstable_transformProfile: platformOptions.unstable_transformProfile,
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// Set true to disable `@babel/plugin-transform-react-jsx`
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useTransformReactJsxExperimental: platformOptions.useTransformReactJsxExperimental,
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disableImportExportTransform: platformOptions.disableImportExportTransform,
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lazyImportExportTransform:
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lazyImportsOption === true
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? importModuleSpecifier => {
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// Do not lazy-initialize packages that are local imports (similar to `lazy: true`
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// behavior) or are in the blacklist.
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return !(
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importModuleSpecifier.includes('./') ||
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lazyImportsBlacklist.has(importModuleSpecifier)
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);
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}
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: // Pass the option directly to `metro-react-native-babel-preset`, which in turn
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// passes it to `babel-plugin-transform-modules-commonjs`
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lazyImportsOption,
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},
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],
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],
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plugins: [
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getAliasPlugin(),
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[require.resolve('@babel/plugin-proposal-decorators'), { legacy: true }],
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platform === 'web' && [require.resolve('babel-plugin-react-native-web')],
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isWebpack && platform !== 'web' && [require.resolve('./plugins/disable-ambiguous-requires')],
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].filter(Boolean),
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};
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};
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function getAliasPlugin() {
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const aliases = {};
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if (hasModule('@expo/vector-icons')) {
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aliases['react-native-vector-icons'] = '@expo/vector-icons';
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}
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if (Object.keys(aliases).length) {
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return [
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require.resolve('babel-plugin-module-resolver'),
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{
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alias: aliases,
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},
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];
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}
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return null;
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}
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function hasModule(name) {
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try {
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return !!require.resolve(name);
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} catch (error) {
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if (error.code === 'MODULE_NOT_FOUND' && error.message.includes(name)) {
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return false;
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}
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throw error;
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}
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}
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function getPlatform(caller) {
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return caller && caller.platform;
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}
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/**
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* Get the name of the `bundler`.
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*
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* @param {*} caller
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*/
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function getBundler(caller) {
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if (!caller) return null;
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const { bundler, name } = caller;
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if (!bundler) {
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if (name === 'metro') {
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// This is a hack to determine if metro is being used.
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return 'metro';
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} else if (name === 'next-babel-turbo-loader') {
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// NextJS 11
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return 'webpack';
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} else if (name === 'babel-loader') {
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// expo/webpack-config, gatsby, storybook, and next.js <10
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return 'webpack';
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}
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}
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// Perhaps we should add a check to log once when an unexpected bundler is being used.
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return bundler || null;
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}
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