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node_modules/metro-babel-transformer/package.json

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+{
+  "name": "metro-babel-transformer",
+  "version": "0.59.0",
+  "description": "Base Babel transformer for Metro",
+  "main": "src/index.js",
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:facebook/metro.git"
+  },
+  "scripts": {
+    "prepare-release": "test -d build && rm -rf src.real && mv src src.real && mv build src",
+    "cleanup-release": "test ! -e build && mv src build && mv src.real src"
+  },
+  "keywords": [
+    "transformer",
+    "metro"
+  ],
+  "license": "MIT",
+  "dependencies": {
+    "@babel/core": "^7.0.0",
+    "metro-source-map": "0.59.0"
+  }
+}

node_modules/metro-babel-transformer/src/index.js

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ *
+ * @format
+ */
+"use strict";
+
+const _require = require("@babel/core"),
+  parseSync = _require.parseSync,
+  transformFromAstSync = _require.transformFromAstSync;
+
+const _require2 = require("metro-source-map"),
+  generateFunctionMap = _require2.generateFunctionMap;
+
+function transform(_ref) {
+  let filename = _ref.filename,
+    options = _ref.options,
+    plugins = _ref.plugins,
+    src = _ref.src;
+  const OLD_BABEL_ENV = process.env.BABEL_ENV;
+  process.env.BABEL_ENV = options.dev
+    ? "development"
+    : process.env.BABEL_ENV || "production";
+
+  try {
+    const babelConfig = {
+      caller: {
+        name: "metro",
+        platform: options.platform
+      },
+      ast: true,
+      babelrc: options.enableBabelRCLookup,
+      code: false,
+      highlightCode: true,
+      filename,
+      plugins,
+      sourceType: "module"
+    };
+    const sourceAst = parseSync(src, babelConfig);
+
+    const _transformFromAstSync = transformFromAstSync(
+        sourceAst,
+        src,
+        babelConfig
+      ),
+      ast = _transformFromAstSync.ast;
+
+    const functionMap = generateFunctionMap(sourceAst, {
+      filename
+    });
+    return {
+      ast,
+      functionMap
+    };
+  } finally {
+    if (OLD_BABEL_ENV) {
+      process.env.BABEL_ENV = OLD_BABEL_ENV;
+    }
+  }
+}
+
+module.exports = {
+  transform
+};

node_modules/metro-babel-transformer/src/index.js.flow

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+const {parseSync, transformFromAstSync} = require('@babel/core');
+const {generateFunctionMap} = require('metro-source-map');
+
+import type {Ast, Plugins} from '@babel/core';
+import type {FBSourceFunctionMap} from 'metro-source-map';
+
+export type CustomTransformOptions = {
+  [string]: mixed,
+  __proto__: null,
+  ...
+};
+
+type BabelTransformerOptions = $ReadOnly<{
+  customTransformOptions?: CustomTransformOptions,
+  dev: boolean,
+  disableFlowStripTypesTransform?: boolean,
+  enableBabelRCLookup?: boolean,
+  enableBabelRuntime: boolean,
+  extendsBabelConfigPath?: string,
+  experimentalImportSupport?: boolean,
+  hot: boolean,
+  inlineRequires: boolean,
+  nonInlinedRequires?: $ReadOnlyArray<string>,
+  minify: boolean,
+  unstable_disableES6Transforms?: boolean,
+  platform: ?string,
+  projectRoot: string,
+  publicPath: string,
+  unstable_transformProfile?: 'default' | 'hermes-stable' | 'hermes-canary',
+  ...
+}>;
+
+export type BabelTransformerArgs = $ReadOnly<{|
+  filename: string,
+  options: BabelTransformerOptions,
+  plugins?: Plugins,
+  src: string,
+|}>;
+
+export type BabelTransformer = {|
+  transform: BabelTransformerArgs => {
+    ast: Ast,
+    functionMap: ?FBSourceFunctionMap,
+    ...
+  },
+  getCacheKey?: () => string,
+|};
+
+function transform({filename, options, plugins, src}: BabelTransformerArgs) {
+  const OLD_BABEL_ENV = process.env.BABEL_ENV;
+  process.env.BABEL_ENV = options.dev
+    ? 'development'
+    : process.env.BABEL_ENV || 'production';
+
+  try {
+    const babelConfig = {
+      caller: {name: 'metro', platform: options.platform},
+      ast: true,
+      babelrc: options.enableBabelRCLookup,
+      code: false,
+      highlightCode: true,
+      filename,
+      plugins,
+      sourceType: 'module',
+    };
+    const sourceAst = parseSync(src, babelConfig);
+    const {ast} = transformFromAstSync(sourceAst, src, babelConfig);
+    const functionMap = generateFunctionMap(sourceAst, {filename});
+
+    return {ast, functionMap};
+  } finally {
+    if (OLD_BABEL_ENV) {
+      process.env.BABEL_ENV = OLD_BABEL_ENV;
+    }
+  }
+}
+
+module.exports = ({
+  transform,
+}: BabelTransformer);