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2026-03-10 16:18:05 +00:00
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const client_module_proxy_plugin_1 = require("./client-module-proxy-plugin");
const common_1 = require("./common");
const environment_restricted_imports_1 = require("./environment-restricted-imports");
const expo_inline_manifest_plugin_1 = require("./expo-inline-manifest-plugin");
const expo_router_plugin_1 = require("./expo-router-plugin");
const import_meta_transform_plugin_1 = require("./import-meta-transform-plugin");
const inline_env_vars_1 = require("./inline-env-vars");
const lazyImports_1 = require("./lazyImports");
const restricted_react_api_plugin_1 = require("./restricted-react-api-plugin");
const server_actions_plugin_1 = require("./server-actions-plugin");
const server_data_loaders_plugin_1 = require("./server-data-loaders-plugin");
const use_dom_directive_plugin_1 = require("./use-dom-directive-plugin");
const widgets_plugin_1 = require("./widgets-plugin");
function getOptions(options, platform) {
const tag = platform === 'web' ? 'web' : 'native';
return {
...options,
...options[tag],
};
}
function babelPresetExpo(api, options = {}) {
const bundler = api.caller(common_1.getBundler);
const isWebpack = bundler === 'webpack';
let platform = api.caller((caller) => caller?.platform);
const engine = api.caller((caller) => caller?.engine) ?? 'default';
const isDev = api.caller(common_1.getIsDev);
const isNodeModule = api.caller(common_1.getIsNodeModule);
const isServer = api.caller(common_1.getIsServer);
const isReactServer = api.caller(common_1.getIsReactServer);
const isFastRefreshEnabled = api.caller(common_1.getIsFastRefreshEnabled);
const isReactCompilerEnabled = api.caller(common_1.getReactCompiler);
const metroSourceType = api.caller(common_1.getMetroSourceType);
const baseUrl = api.caller(common_1.getBaseUrl);
const supportsStaticESM = api.caller((caller) => caller?.supportsStaticESM);
const isServerEnv = isServer || isReactServer;
// Unlike `isDev`, this will be `true` when the bundler is explicitly set to `production`,
// i.e. `false` when testing, development, or used with a bundler that doesn't specify the correct inputs.
const isProduction = api.caller(common_1.getIsProd);
const inlineEnvironmentVariables = api.caller(common_1.getInlineEnvVarsEnabled);
// If the `platform` prop is not defined then this must be a custom config that isn't
// defining a platform in the babel-loader. Currently this may happen with Next.js + Expo web.
if (!platform && isWebpack) {
platform = 'web';
}
// Use the simpler babel preset for web and server environments (both web and native SSR).
const isModernEngine = platform === 'web' || isServerEnv;
const platformOptions = getOptions(options, platform);
// If the input is a script, we're unable to add any dependencies. Since the @babel/runtime transformer
// adds extra dependencies (requires/imports) we need to disable it
if (metroSourceType === 'script') {
platformOptions.enableBabelRuntime = false;
}
if (platformOptions.useTransformReactJSXExperimental != null) {
throw new Error(`babel-preset-expo: The option 'useTransformReactJSXExperimental' has been removed in favor of { jsxRuntime: 'classic' }.`);
}
if (platformOptions.disableImportExportTransform == null) {
if (platform === 'web') {
// Only disable import/export transform when Webpack is used because
// Metro does not support tree-shaking.
platformOptions.disableImportExportTransform = supportsStaticESM ?? isWebpack;
}
else {
platformOptions.disableImportExportTransform = supportsStaticESM ?? false;
}
}
if (platformOptions.unstable_transformProfile == null) {
platformOptions.unstable_transformProfile = engine === 'hermes' ? 'hermes-stable' : 'default';
}
// Note that if `options.lazyImports` is not set (i.e., `null` or `undefined`),
// `@react-native/babel-preset` will handle it.
const lazyImportsOption = platformOptions?.lazyImports;
const extraPlugins = [];
// Add compiler as soon as possible to prevent other plugins from modifying the code.
if (isReactCompilerEnabled &&
// Don't run compiler on node modules, it can only safely be run on the user's code.
!isNodeModule &&
// Only run for client code. It's unclear if compiler has any benefits for React Server Components.
// NOTE: We might want to allow running it to prevent hydration errors.
!isServerEnv &&
// Give users the ability to opt-out of the feature, per-platform.
platformOptions['react-compiler'] !== false) {
const reactCompilerOptions = platformOptions['react-compiler'];
const reactCompilerOptOutDirectives = new Set([
// We need to opt-out for our widgets, since they're stringified functions that output Swift UI JSX
'widget',
// We need to manually include the default opt-out directives, since they get overridden
// See:
// - https://github.com/facebook/react/blob/e0cc720/compiler/packages/babel-plugin-react-compiler/src/Entrypoint/Program.ts#L48C1-L48C77
// - https://github.com/facebook/react/blob/e0cc720/compiler/packages/babel-plugin-react-compiler/src/Entrypoint/Program.ts#L69-L86
'use no memo',
'use no forget',
// Add the user's override but preserve defaults above to avoid the pitfall of them being removed
...(reactCompilerOptions?.customOptOutDirectives ?? []),
]);
extraPlugins.push([
require('babel-plugin-react-compiler'),
{
target: '19',
environment: {
enableResetCacheOnSourceFileChanges: !isProduction,
...(platformOptions['react-compiler']?.environment ?? {}),
},
panicThreshold: isDev ? undefined : 'NONE',
...reactCompilerOptions,
// See: https://github.com/facebook/react/blob/074d96b/compiler/packages/babel-plugin-react-compiler/src/Entrypoint/Options.ts#L160-L163
customOptOutDirectives: [...reactCompilerOptOutDirectives],
},
]);
}
if (engine !== 'hermes') {
// `@react-native/babel-preset` configures this plugin with `{ loose: true }`, which breaks all
// getters and setters in spread objects. We need to add this plugin ourself without that option.
// @see https://github.com/expo/expo/pull/11960#issuecomment-887796455
extraPlugins.push([
require('@babel/plugin-transform-object-rest-spread'),
// Assume no dependence on getters or evaluation order. See https://github.com/babel/babel/pull/11520
{ loose: true, useBuiltIns: true },
]);
}
else if (!isModernEngine) {
// This is added back on hermes to ensure the react-jsx-dev plugin (`@babel/preset-react`) works as expected when
// JSX is used in a function body. This is technically not required in production, but we
// should retain the same behavior since it's hard to debug the differences.
extraPlugins.push(require('@babel/plugin-transform-parameters'),
// Add support for class static blocks.
[require('@babel/plugin-transform-class-static-block'), { loose: true }]);
}
const inlines = {
'process.env.EXPO_OS': platform,
// 'typeof document': isServerEnv ? 'undefined' : 'object',
'process.env.EXPO_SERVER': !!isServerEnv,
};
// `typeof window` is left in place for native + client environments.
// NOTE(@kitten): We're temporarily disabling this default optimization for Web targets due to Web Workers
// We're currently not passing metadata to indicate we're transforming for a Web Worker to disable this automatically
const minifyTypeofWindow = platformOptions.minifyTypeofWindow ?? isServerEnv;
if (minifyTypeofWindow !== false) {
// This nets out slightly faster in development when considering the cost of bundling server dependencies.
inlines['typeof window'] = isServerEnv ? 'undefined' : 'object';
}
if (isProduction) {
inlines['process.env.NODE_ENV'] = 'production';
inlines['__DEV__'] = false;
inlines['Platform.OS'] = platform;
}
if (process.env.NODE_ENV !== 'test') {
inlines['process.env.EXPO_BASE_URL'] = baseUrl;
}
extraPlugins.push([require('./define-plugin'), inlines]);
if (isProduction) {
// Metro applies a version of this plugin too but it does it after the Platform modules have been transformed to CJS, this breaks the transform.
// Here, we'll apply it before the commonjs transform, in production only, to ensure `Platform.OS` is replaced with a string literal.
extraPlugins.push([
require('./minify-platform-select-plugin'),
{
platform,
},
]);
}
if (platformOptions.useTransformReactJSXExperimental != null) {
throw new Error(`babel-preset-expo: The option 'useTransformReactJSXExperimental' has been removed in favor of { jsxRuntime: 'classic' }.`);
}
// Only apply in non-server, for metro-only, in production environments, when the user hasn't disabled the feature.
// Webpack uses DefinePlugin for environment variables.
// Development uses an uncached serializer.
// Servers read from the environment.
// Users who disable the feature may be using a different babel plugin.
if (inlineEnvironmentVariables) {
extraPlugins.push(inline_env_vars_1.expoInlineEnvVars);
}
if (platform === 'web') {
extraPlugins.push(require('babel-plugin-react-native-web'));
}
// Webpack uses the DefinePlugin to provide the manifest to `expo-constants`.
if (bundler !== 'webpack') {
extraPlugins.push(expo_inline_manifest_plugin_1.expoInlineManifestPlugin);
}
if ((0, common_1.hasModule)('expo-router')) {
extraPlugins.push(expo_router_plugin_1.expoRouterBabelPlugin);
// Process `loader()` functions for client, loader and server bundles (excluding RSC)
// - Client bundles: Remove loader exports, they run on server only
// - Server bundles: Keep loader exports (needed for SSG)
// - Loader-only bundles: Keep only loader exports, remove everything else
if (!isReactServer) {
extraPlugins.push(server_data_loaders_plugin_1.serverDataLoadersPlugin);
}
}
extraPlugins.push(client_module_proxy_plugin_1.reactClientReferencesPlugin);
// Ensure these only run when the user opts-in to bundling for a react server to prevent unexpected behavior for
// users who are bundling using the client-only system.
if (isReactServer) {
extraPlugins.push(server_actions_plugin_1.reactServerActionsPlugin);
extraPlugins.push(restricted_react_api_plugin_1.environmentRestrictedReactAPIsPlugin);
}
else {
// DOM components must run after "use client" and only in client environments.
extraPlugins.push(use_dom_directive_plugin_1.expoUseDomDirectivePlugin);
}
// This plugin is fine to run whenever as the server-only imports were introduced as part of RSC and shouldn't be used in any client code.
extraPlugins.push(environment_restricted_imports_1.environmentRestrictedImportsPlugin);
// Transform widget component JSX expressions to capture widget components for native-side evaluation.
// This enables the native side to re-evaluate widget components with updated props without re-sending the entire layout.
if ((0, common_1.hasModule)('expo-widgets')) {
extraPlugins.push(widgets_plugin_1.widgetsPlugin);
}
if (platformOptions.enableReactFastRefresh ||
(isFastRefreshEnabled && platformOptions.enableReactFastRefresh !== false)) {
extraPlugins.push([
require('react-refresh/babel'),
{
// We perform the env check to enable `isFastRefreshEnabled`, unless the plugin is force-enabled
skipEnvCheck: platformOptions.enableReactFastRefresh !== true,
},
]);
}
if (platformOptions.disableImportExportTransform) {
extraPlugins.push([require('./detect-dynamic-exports').detectDynamicExports]);
}
const polyfillImportMeta = platformOptions.unstable_transformImportMeta ?? isServerEnv;
extraPlugins.push((0, import_meta_transform_plugin_1.expoImportMetaTransformPluginFactory)(polyfillImportMeta === true));
return {
presets: [
(() => {
const presetOpts = {
// Defaults to undefined, set to `true` to disable `@babel/plugin-transform-flow-strip-types`
disableFlowStripTypesTransform: platformOptions.disableFlowStripTypesTransform,
// Defaults to Babel caller's `babelRuntimeVersion` or the version of `@babel/runtime` for this package's peer
// Set to `false` to disable `@babel/plugin-transform-runtime`
enableBabelRuntime: platformOptions.enableBabelRuntime == null ||
platformOptions.enableBabelRuntime === true
? (0, common_1.getBabelRuntimeVersion)()
: platformOptions.enableBabelRuntime,
// This reduces the amount of transforms required, as Hermes supports many modern language features.
unstable_transformProfile: platformOptions.unstable_transformProfile,
// Set true to disable `@babel/plugin-transform-react-jsx` and
// the deprecated packages `@babel/plugin-transform-react-jsx-self`, and `@babel/plugin-transform-react-jsx-source`.
//
// Otherwise, you'll sometime get errors like the following (starting in Expo SDK 43, React Native 64, React 17):
//
// TransformError App.js: /path/to/App.js: Duplicate __self prop found. You are most likely using the deprecated transform-react-jsx-self Babel plugin.
// Both __source and __self are automatically set when using the automatic jsxRuntime. Remove transform-react-jsx-source and transform-react-jsx-self from your Babel config.
useTransformReactJSXExperimental: true,
// This will never be used regardless because `useTransformReactJSXExperimental` is set to `true`.
// https://github.com/facebook/react-native/blob/a4a8695cec640e5cf12be36a0c871115fbce9c87/packages/react-native-babel-preset/src/configs/main.js#L151
withDevTools: false,
disableImportExportTransform: platformOptions.disableImportExportTransform,
disableDeepImportWarnings: platformOptions.disableDeepImportWarnings,
lazyImportExportTransform: lazyImportsOption === true
? (importModuleSpecifier) => {
// Do not lazy-initialize packages that are local imports (similar to `lazy: true`
// behavior) or are in the blacklist.
return !(importModuleSpecifier.includes('./') || lazyImports_1.lazyImports.has(importModuleSpecifier));
}
: // Pass the option directly to `@react-native/babel-preset`, which in turn
// passes it to `babel-plugin-transform-modules-commonjs`
lazyImportsOption,
dev: isDev,
};
if (isModernEngine) {
return [require('./web-preset'), presetOpts];
}
// We use `require` here instead of directly using the package name because we want to
// specifically use the `@react-native/babel-preset` installed by this package (ex:
// `babel-preset-expo/node_modules/`). This way the preset will not change unintentionally.
// Reference: https://github.com/expo/expo/pull/4685#discussion_r307143920
const { getPreset } = require('@react-native/babel-preset');
// We need to customize the `@react-native/babel-preset` to ensure that the `@babel/plugin-transform-export-namespace-from`
// plugin is run after the TypeScript plugins. This is normally handled by the combination of standard `@babel/preset-env` and `@babel/preset-typescript` but React Native
// doesn't do that and we can't rely on Hermes spec compliance enough to use standard presets.
const babelPresetReactNativeEnv = getPreset(null, presetOpts);
// Add the `@babel/plugin-transform-export-namespace-from` plugin to the preset but ensure it runs after
// the TypeScript plugins to ensure namespace type exports (TypeScript 5.0+) `export type * as Types from './module';`
// are stripped before the transform. Otherwise the transform will extraneously include the types as syntax.
babelPresetReactNativeEnv.overrides.push({
plugins: [require('./babel-plugin-transform-export-namespace-from')],
});
return babelPresetReactNativeEnv;
})(),
// React support with similar options to Metro.
// We override this logic outside of the metro preset so we can add support for
// React 17 automatic JSX transformations.
// The only known issue is the plugin `@babel/plugin-transform-react-display-name` will be run twice,
// once in the Metro plugin, and another time here.
[
require('@babel/preset-react'),
{
development: isDev,
// Defaults to `automatic`, pass in `classic` to disable auto JSX transformations.
runtime: platformOptions?.jsxRuntime || 'automatic',
...(platformOptions &&
platformOptions.jsxRuntime !== 'classic' && {
importSource: (platformOptions && platformOptions.jsxImportSource) || 'react',
}),
// NOTE: Unexposed props:
// pragma?: string;
// pragmaFrag?: string;
// pure?: string;
// throwIfNamespace?: boolean;
// useBuiltIns?: boolean;
// useSpread?: boolean;
},
],
],
plugins: [
...extraPlugins,
// TODO: Remove
platformOptions.decorators !== false && [
require('@babel/plugin-proposal-decorators'),
platformOptions.decorators ?? { legacy: true },
],
// Automatically add `react-native-reanimated/plugin` when the package is installed.
// TODO: Move to be a customTransformOption.
(0, common_1.hasModule)('react-native-worklets') &&
platformOptions.worklets !== false &&
platformOptions.reanimated !== false
? [require('react-native-worklets/plugin')]
: (0, common_1.hasModule)('react-native-reanimated') &&
platformOptions.reanimated !== false && [require('react-native-reanimated/plugin')],
].filter(Boolean),
};
}
exports.default = babelPresetExpo;
module.exports = babelPresetExpo;