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node_modules/@react-native/babel-preset/src/configs/main.js

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+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @noflow
+ */
+
+'use strict';
+
+const passthroughSyntaxPlugins = require('../passthrough-syntax-plugins');
+const lazyImports = require('./lazy-imports');
+
+const EXCLUDED_FIRST_PARTY_PATHS = [
+  /[/\\]node_modules[/\\]/,
+  /[/\\]packages[/\\]react-native[/\\]/,
+  /[/\\]packages[/\\]virtualized-lists[/\\]/,
+  /[/\\]private[/\\]react-native-fantom[/\\]/,
+];
+
+// customTransformOptions may be strings from URL params, or booleans passed
+// programatically. For strings, handle them as Metro does when parsing URLs.
+const TRUE_VALS = new Set([true, 'true', '1']);
+
+function isTypeScriptSource(fileName) {
+  return !!fileName && fileName.endsWith('.ts');
+}
+
+function isTSXSource(fileName) {
+  return !!fileName && fileName.endsWith('.tsx');
+}
+
+function isFirstParty(fileName) {
+  return (
+    !!fileName &&
+    !EXCLUDED_FIRST_PARTY_PATHS.some(regex => regex.test(fileName))
+  );
+}
+
+// use `this.foo = bar` instead of `this.defineProperty('foo', ...)`
+const loose = true;
+
+const getPreset = (src, options) => {
+  const transformProfile =
+    (options && options.unstable_transformProfile) || 'default';
+  const isHermesStable = transformProfile === 'hermes-stable';
+  const isHermesCanary = transformProfile === 'hermes-canary';
+  const isHermes = isHermesStable || isHermesCanary;
+
+  // We enable regenerator for !isHermes. Additionally, in dev mode we also
+  // enable regenerator for the time being because Static Hermes doesn't yet
+  // support debugging native generators. However, some apps have native
+  // generators in release mode because it has already yielded perf wins. The
+  // next release of Static Hermes will close this gap, so this won't be
+  // permanent.
+  const enableRegenerator = !isHermes || options.dev;
+
+  const isNull = src == null;
+  const hasClass = isNull || src.indexOf('class') !== -1;
+  const preserveClasses = TRUE_VALS.has(
+    options?.customTransformOptions?.unstable_preserveClasses,
+  );
+
+  const extraPlugins = [];
+  const firstPartyPlugins = [];
+
+  if (!options.useTransformReactJSXExperimental) {
+    extraPlugins.push([
+      require('@babel/plugin-transform-react-jsx'),
+      {runtime: 'automatic'},
+    ]);
+  }
+
+  if (
+    !options.disableStaticViewConfigsCodegen &&
+    (src === null || /\bcodegenNativeComponent</.test(src))
+  ) {
+    extraPlugins.push([require('@react-native/babel-plugin-codegen')]);
+  }
+
+  if (!options || !options.disableImportExportTransform) {
+    extraPlugins.push(
+      [require('@babel/plugin-proposal-export-default-from')],
+      [
+        require('@babel/plugin-transform-modules-commonjs'),
+        {
+          strict: false,
+          strictMode: false, // prevent "use strict" injections
+          lazy:
+            options && options.lazyImportExportTransform != null
+              ? options.lazyImportExportTransform
+              : importSpecifier => lazyImports.has(importSpecifier),
+          allowTopLevelThis: true, // dont rewrite global `this` -> `undefined`
+        },
+      ],
+    );
+  }
+
+  if (hasClass && !preserveClasses) {
+    extraPlugins.push([require('@babel/plugin-transform-classes')]);
+  }
+
+  if (!isHermes && (isNull || src.includes('=>'))) {
+    extraPlugins.push([require('@babel/plugin-transform-arrow-functions')]);
+  }
+
+  if (!isHermes) {
+    extraPlugins.push([require('@babel/plugin-transform-computed-properties')]);
+    extraPlugins.push([require('@babel/plugin-transform-parameters')]);
+    extraPlugins.push([
+      require('@babel/plugin-transform-shorthand-properties'),
+    ]);
+    extraPlugins.push([
+      require('@babel/plugin-transform-optional-catch-binding'),
+    ]);
+    extraPlugins.push([require('@babel/plugin-transform-function-name')]);
+    extraPlugins.push([require('@babel/plugin-transform-literals')]);
+    extraPlugins.push([require('@babel/plugin-transform-numeric-separator')]);
+    extraPlugins.push([require('@babel/plugin-transform-sticky-regex')]);
+  } else {
+    extraPlugins.push([
+      require('@babel/plugin-transform-named-capturing-groups-regex'),
+    ]);
+    // Needed for regenerator
+    if (isHermes && enableRegenerator) {
+      extraPlugins.push([
+        require('@babel/plugin-transform-optional-catch-binding'),
+      ]);
+    }
+  }
+  extraPlugins.push([
+    require('@babel/plugin-transform-destructuring'),
+    {useBuiltIns: true},
+  ]);
+  if (!isHermes && (isNull || hasClass || src.indexOf('...') !== -1)) {
+    extraPlugins.push(
+      [require('@babel/plugin-transform-spread')],
+      [
+        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},
+      ],
+    );
+  }
+  if (isNull || src.indexOf('async') !== -1) {
+    extraPlugins.push([
+      require('@babel/plugin-transform-async-generator-functions'),
+    ]);
+    extraPlugins.push([require('@babel/plugin-transform-async-to-generator')]);
+  }
+  if (
+    isNull ||
+    src.indexOf('React.createClass') !== -1 ||
+    src.indexOf('createReactClass') !== -1
+  ) {
+    extraPlugins.push([require('@babel/plugin-transform-react-display-name')]);
+  }
+  // This is also needed for regenerator
+  if (enableRegenerator && (isNull || src.indexOf('?.') !== -1)) {
+    extraPlugins.push([
+      require('@babel/plugin-transform-optional-chaining'),
+      {loose: true},
+    ]);
+  }
+  // This is also needed for regenerator
+  if (enableRegenerator && (isNull || src.indexOf('??') !== -1)) {
+    extraPlugins.push([
+      require('@babel/plugin-transform-nullish-coalescing-operator'),
+      {loose: true},
+    ]);
+  }
+  if (
+    !isHermes &&
+    (isNull ||
+      src.indexOf('??=') !== -1 ||
+      src.indexOf('||=') !== -1 ||
+      src.indexOf('&&=') !== -1)
+  ) {
+    extraPlugins.push([
+      require('@babel/plugin-transform-logical-assignment-operators'),
+      {loose: true},
+    ]);
+  }
+
+  if (options && options.dev && !options.disableDeepImportWarnings) {
+    firstPartyPlugins.push([require('../plugin-warn-on-deep-imports.js')]);
+  }
+
+  if (options && options.dev && !options.useTransformReactJSXExperimental) {
+    extraPlugins.push([require('@babel/plugin-transform-react-jsx-source')]);
+    extraPlugins.push([require('@babel/plugin-transform-react-jsx-self')]);
+  }
+
+  if (isHermes && enableRegenerator) {
+    const hasForOf =
+      isNull || (src.indexOf('for') !== -1 && src.indexOf('of') !== -1);
+    if (hasForOf) {
+      // Needed for regenerator
+      extraPlugins.push([
+        require('@babel/plugin-transform-for-of'),
+        {loose: true},
+      ]);
+    }
+  }
+
+  if (!options || options.enableBabelRuntime !== false) {
+    // Allows configuring a specific runtime version to optimize output
+    const isVersion = typeof options?.enableBabelRuntime === 'string';
+
+    extraPlugins.push([
+      require('@babel/plugin-transform-runtime'),
+      {
+        helpers: true,
+        regenerator: enableRegenerator,
+        ...(isVersion && {version: options.enableBabelRuntime}),
+      },
+    ]);
+  } else if (isHermes && enableRegenerator) {
+    extraPlugins.push([require('@babel/plugin-transform-regenerator')]);
+  }
+
+  return {
+    comments: false,
+    compact: options.compact !== false,
+    overrides: [
+      // the flow strip types plugin must go BEFORE class properties!
+      // there'll be a test case that fails if you don't.
+      {
+        plugins: [require('@babel/plugin-transform-flow-strip-types')],
+      },
+      {
+        plugins: [
+          [
+            require('babel-plugin-syntax-hermes-parser'),
+            {
+              parseLangTypes: 'flow',
+              reactRuntimeTarget: '19',
+              ...options.hermesParserOptions,
+            },
+          ],
+          [require('babel-plugin-transform-flow-enums')],
+          [require('@babel/plugin-transform-block-scoping')],
+          ...(preserveClasses
+            ? []
+            : [[require('@babel/plugin-transform-class-properties'), {loose}]]),
+          [require('@babel/plugin-transform-private-methods'), {loose}],
+          [
+            require('@babel/plugin-transform-private-property-in-object'),
+            {loose},
+          ],
+          [require('@babel/plugin-syntax-dynamic-import')],
+          [require('@babel/plugin-syntax-export-default-from')],
+          ...passthroughSyntaxPlugins,
+          [require('@babel/plugin-transform-unicode-regex')],
+        ],
+      },
+      {
+        test: isTypeScriptSource,
+        plugins: [
+          [
+            require('@babel/plugin-transform-typescript'),
+            {
+              isTSX: false,
+              allowNamespaces: true,
+            },
+          ],
+        ],
+      },
+      {
+        test: isTSXSource,
+        plugins: [
+          [
+            require('@babel/plugin-transform-typescript'),
+            {
+              isTSX: true,
+              allowNamespaces: true,
+            },
+          ],
+        ],
+      },
+      {
+        test: isFirstParty,
+        plugins: firstPartyPlugins,
+      },
+      {
+        plugins: extraPlugins,
+      },
+    ],
+  };
+};
+
+module.exports = options => {
+  if (options.withDevTools == null) {
+    const env = process.env.BABEL_ENV || process.env.NODE_ENV;
+    if (!env || env === 'development') {
+      return getPreset(null, {...options, dev: true});
+    }
+  }
+  return getPreset(null, options);
+};
+
+module.exports.getPreset = getPreset;