Patches metro's worker.js for :advanced compilation to work with React Native

patch-metro-worker.cljs

;USAGE
;1. get https://github.com/planck-repl/planck
;2. run it from the project folder like this:
;plk patch-metro-worker.cljs
(require '[planck.core :refer [spit slurp]])

;Works with ReactNative 0.62

(def my-production-index-js-file-name "index.prod.js")

(def file-original
  "/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n *\n * @format\n */\n\"use strict\";\n\nfunction _objectWithoutProperties(source, excluded) {\n  if (source == null) return {};\n  var target = _objectWithoutPropertiesLoose(source, excluded);\n  var key, i;\n  if (Object.getOwnPropertySymbols) {\n    var sourceSymbolKeys = Object.getOwnPropertySymbols(source);\n    for (i = 0; i < sourceSymbolKeys.length; i++) {\n      key = sourceSymbolKeys[i];\n      if (excluded.indexOf(key) >= 0) continue;\n      if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;\n      target[key] = source[key];\n    }\n  }\n  return target;\n}\n\nfunction _objectWithoutPropertiesLoose(source, excluded) {\n  if (source == null) return {};\n  var target = {};\n  var sourceKeys = Object.keys(source);\n  var key, i;\n  for (i = 0; i < sourceKeys.length; i++) {\n    key = sourceKeys[i];\n    if (excluded.indexOf(key) >= 0) continue;\n    target[key] = source[key];\n  }\n  return target;\n}\n\nfunction _objectSpread(target) {\n  for (var i = 1; i < arguments.length; i++) {\n    var source = arguments[i] != null ? arguments[i] : {};\n    var ownKeys = Object.keys(source);\n    if (typeof Object.getOwnPropertySymbols === \"function\") {\n      ownKeys = ownKeys.concat(\n        Object.getOwnPropertySymbols(source).filter(function(sym) {\n          return Object.getOwnPropertyDescriptor(source, sym).enumerable;\n        })\n      );\n    }\n    ownKeys.forEach(function(key) {\n      _defineProperty(target, key, source[key]);\n    });\n  }\n  return target;\n}\n\nfunction _defineProperty(obj, key, value) {\n  if (key in obj) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n  } else {\n    obj[key] = value;\n  }\n  return obj;\n}\n\nfunction asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {\n  try {\n    var info = gen[key](arg);\n    var value = info.value;\n  } catch (error) {\n    reject(error);\n    return;\n  }\n  if (info.done) {\n    resolve(value);\n  } else {\n    Promise.resolve(value).then(_next, _throw);\n  }\n}\n\nfunction _asyncToGenerator(fn) {\n  return function() {\n    var self = this,\n      args = arguments;\n    return new Promise(function(resolve, reject) {\n      var gen = fn.apply(self, args);\n      function _next(value) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"next\", value);\n      }\n      function _throw(err) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"throw\", err);\n      }\n      _next(undefined);\n    });\n  };\n}\n\nconst JsFileWrapping = require(\"../ModuleGraph/worker/JsFileWrapping\");\n\nconst assetTransformer = require(\"../assetTransformer\");\n\nconst babylon = require(\"@babel/parser\");\n\nconst collectDependencies = require(\"../ModuleGraph/worker/collectDependencies\");\n\nconst constantFoldingPlugin = require(\"./worker/constant-folding-plugin\");\n\nconst generateImportNames = require(\"../ModuleGraph/worker/generateImportNames\");\n\nconst generate = require(\"@babel/generator\").default;\n\nconst getKeyFromFiles = require(\"../lib/getKeyFromFiles\");\n\nconst getMinifier = require(\"../lib/getMinifier\");\n\nconst importExportPlugin = require(\"./worker/import-export-plugin\");\n\nconst inlinePlugin = require(\"./worker/inline-plugin\");\n\nconst inlineRequiresPlugin = require(\"babel-preset-fbjs/plugins/inline-requires\");\n\nconst normalizePseudoglobals = require(\"./worker/normalizePseudoglobals\");\n\nconst _require = require(\"@babel/core\"),\n  transformFromAstSync = _require.transformFromAstSync;\n\nconst _require2 = require(\"metro-cache\"),\n  stableHash = _require2.stableHash;\n\nconst types = require(\"@babel/types\");\n\nconst countLines = require(\"../lib/countLines\");\n\nconst _require3 = require(\"metro-source-map\"),\n  fromRawMappings = _require3.fromRawMappings,\n  toBabelSegments = _require3.toBabelSegments,\n  toSegmentTuple = _require3.toSegmentTuple;\n\nfunction getDynamicDepsBehavior(inPackages, filename) {\n  switch (inPackages) {\n    case \"reject\":\n      return \"reject\";\n\n    case \"throwAtRuntime\":\n      const isPackage = /(?:^|[/\\\\])node_modules[/\\\\]/.test(filename);\n      return isPackage ? inPackages : \"reject\";\n\n    default:\n      inPackages;\n      throw new Error(\n        `invalid value for dynamic deps behavior: \\`${inPackages}\\``\n      );\n  }\n}\n\nclass JsTransformer {\n  constructor(projectRoot, config) {\n    this._projectRoot = projectRoot;\n    this._config = config;\n  }\n\n  transform(filename, data, options) {\n    var _this = this;\n\n    return _asyncToGenerator(function*() {\n      const sourceCode = data.toString(\"utf8\");\n      let type = \"js/module\";\n\n      if (options.type === \"asset\") {\n        type = \"js/module/asset\";\n      }\n\n      if (options.type === \"script\") {\n        type = \"js/script\";\n      }\n\n      if (filename.endsWith(\".json\")) {\n        let code = JsFileWrapping.wrapJson(sourceCode);\n        let map = [];\n\n        if (options.minify) {\n          var _ref = yield _this._minifyCode(filename, code, sourceCode, map);\n\n          map = _ref.map;\n          code = _ref.code;\n        }\n\n        return {\n          dependencies: [],\n          output: [\n            {\n              data: {\n                code,\n                lineCount: countLines(code),\n                map,\n                functionMap: null\n              },\n              type\n            }\n          ]\n        };\n      } // $FlowFixMe TODO t26372934 Plugin system\n\n      const transformer = require(_this._config.babelTransformerPath);\n\n      const transformerArgs = {\n        filename,\n        options: _objectSpread({}, options, {\n          enableBabelRCLookup: _this._config.enableBabelRCLookup,\n          enableBabelRuntime: _this._config.enableBabelRuntime,\n          // Inline requires are now performed at a secondary step. We cannot\n          // unfortunately remove it from the internal transformer, since this one\n          // is used by other tooling, and this would affect it.\n          inlineRequires: false,\n          projectRoot: _this._projectRoot,\n          publicPath: _this._config.publicPath\n        }),\n        plugins: [],\n        src: sourceCode\n      };\n      const transformResult =\n        type === \"js/module/asset\"\n          ? _objectSpread(\n              {},\n              yield assetTransformer.transform(\n                transformerArgs,\n                _this._config.assetRegistryPath,\n                _this._config.assetPlugins\n              ),\n              {\n                functionMap: null\n              }\n            )\n          : yield transformer.transform(transformerArgs); // Transformers can ouptut null ASTs (if they ignore the file). In that case\n      // we need to parse the module source code to get their AST.\n\n      let ast =\n        transformResult.ast ||\n        babylon.parse(sourceCode, {\n          sourceType: \"unambiguous\"\n        });\n\n      const _generateImportNames = generateImportNames(ast),\n        importDefault = _generateImportNames.importDefault,\n        importAll = _generateImportNames.importAll; // Add \"use strict\" if the file was parsed as a module, and the directive did\n      // not exist yet.\n\n      const directives = ast.program.directives;\n\n      if (\n        ast.program.sourceType === \"module\" &&\n        directives.findIndex(d => d.value.value === \"use strict\") === -1\n      ) {\n        directives.push(types.directive(types.directiveLiteral(\"use strict\")));\n      } // Perform the import-export transform (in case it's still needed), then\n      // fold requires and perform constant folding (if in dev).\n\n      const plugins = [];\n\n      const opts = _objectSpread({}, options, {\n        inlineableCalls: [importDefault, importAll],\n        importDefault,\n        importAll\n      });\n\n      if (options.experimentalImportSupport) {\n        plugins.push([importExportPlugin, opts]);\n      }\n\n      if (options.inlineRequires) {\n        plugins.push([inlineRequiresPlugin, opts]);\n      }\n\n      if (!options.dev) {\n        plugins.push([constantFoldingPlugin, opts]);\n      }\n\n      plugins.push([inlinePlugin, opts]);\n\n      var _transformFromAstSync = transformFromAstSync(ast, \"\", {\n        ast: true,\n        babelrc: false,\n        code: false,\n        configFile: false,\n        comments: false,\n        compact: false,\n        filename,\n        plugins,\n        sourceMaps: false\n      });\n\n      ast = _transformFromAstSync.ast;\n      let dependencyMapName = \"\";\n      let dependencies;\n      let wrappedAst; // If the module to transform is a script (meaning that is not part of the\n      // dependency graph and it code will just be prepended to the bundle modules),\n      // we need to wrap it differently than a commonJS module (also, scripts do\n      // not have dependencies).\n\n      if (type === \"js/script\") {\n        dependencies = [];\n        wrappedAst = JsFileWrapping.wrapPolyfill(ast);\n      } else {\n        try {\n          const opts = {\n            asyncRequireModulePath: _this._config.asyncRequireModulePath,\n            dynamicRequires: getDynamicDepsBehavior(\n              _this._config.dynamicDepsInPackages,\n              filename\n            ),\n            inlineableCalls: [importDefault, importAll],\n            keepRequireNames: options.dev\n          };\n\n          var _collectDependencies = collectDependencies(ast, opts);\n\n          ast = _collectDependencies.ast;\n          dependencies = _collectDependencies.dependencies;\n          dependencyMapName = _collectDependencies.dependencyMapName;\n        } catch (error) {\n          if (error instanceof collectDependencies.InvalidRequireCallError) {\n            throw new InvalidRequireCallError(error, filename);\n          }\n\n          throw error;\n        }\n\n        var _JsFileWrapping$wrapM = JsFileWrapping.wrapModule(\n          ast,\n          importDefault,\n          importAll,\n          dependencyMapName\n        );\n\n        wrappedAst = _JsFileWrapping$wrapM.ast;\n      }\n\n      const reserved =\n        options.minify && data.length <= _this._config.optimizationSizeLimit\n          ? normalizePseudoglobals(wrappedAst)\n          : [];\n      const result = generate(\n        wrappedAst,\n        {\n          comments: false,\n          compact: false,\n          filename,\n          retainLines: false,\n          sourceFileName: filename,\n          sourceMaps: true\n        },\n        sourceCode\n      );\n      let map = result.rawMappings\n        ? result.rawMappings.map(toSegmentTuple)\n        : [];\n      let code = result.code;\n\n      if (options.minify) {\n        var _ref2 = yield _this._minifyCode(\n          filename,\n          result.code,\n          sourceCode,\n          map,\n          reserved\n        );\n\n        map = _ref2.map;\n        code = _ref2.code;\n      }\n\n      const functionMap = transformResult.functionMap;\n      return {\n        dependencies,\n        output: [\n          {\n            data: {\n              code,\n              lineCount: countLines(code),\n              map,\n              functionMap\n            },\n            type\n          }\n        ]\n      };\n    })();\n  }\n\n  _minifyCode(filename, code, source, map) {\n    var _this2 = this;\n\n    let reserved =\n      arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : [];\n    return _asyncToGenerator(function*() {\n      const sourceMap = fromRawMappings([\n        {\n          code,\n          source,\n          map,\n          functionMap: null,\n          path: filename\n        }\n      ]).toMap(undefined, {});\n      const minify = getMinifier(_this2._config.minifierPath);\n\n      try {\n        const minified = minify({\n          code,\n          map: sourceMap,\n          filename,\n          reserved,\n          config: _this2._config.minifierConfig\n        });\n        return {\n          code: minified.code,\n          map: minified.map\n            ? toBabelSegments(minified.map).map(toSegmentTuple)\n            : []\n        };\n      } catch (error) {\n        if (error.constructor.name === \"JS_Parse_Error\") {\n          throw new Error(\n            `${error.message} in file ${filename} at ${error.line}:${error.col}`\n          );\n        }\n\n        throw error;\n      }\n    })();\n  }\n\n  getCacheKey() {\n    const _this$_config = this._config,\n      babelTransformerPath = _this$_config.babelTransformerPath,\n      minifierPath = _this$_config.minifierPath,\n      config = _objectWithoutProperties(_this$_config, [\n        \"babelTransformerPath\",\n        \"minifierPath\"\n      ]);\n\n    const filesKey = getKeyFromFiles([\n      require.resolve(babelTransformerPath),\n      require.resolve(minifierPath),\n      require.resolve(\"../ModuleGraph/worker/JsFileWrapping\"),\n      require.resolve(\"../assetTransformer\"),\n      require.resolve(\"../ModuleGraph/worker/collectDependencies\"),\n      require.resolve(\"./worker/constant-folding-plugin\"),\n      require.resolve(\"../lib/getMinifier\"),\n      require.resolve(\"./worker/inline-plugin\"),\n      require.resolve(\"./worker/import-export-plugin\"),\n      require.resolve(\"./worker/normalizePseudoglobals\"),\n      require.resolve(\"../ModuleGraph/worker/optimizeDependencies\"),\n      require.resolve(\"../ModuleGraph/worker/generateImportNames\")\n    ]);\n\n    const babelTransformer = require(babelTransformerPath);\n\n    const babelTransformerKey = babelTransformer.getCacheKey\n      ? babelTransformer.getCacheKey()\n      : \"\";\n    return [\n      filesKey,\n      stableHash(config).toString(\"hex\"),\n      babelTransformerKey\n    ].join(\"$\");\n  }\n}\n\nclass InvalidRequireCallError extends Error {\n  constructor(innerError, filename) {\n    super(`${filename}:${innerError.message}`);\n    this.innerError = innerError;\n    this.filename = filename;\n  }\n}\n\nmodule.exports = JsTransformer;\n")


(def file-patched
  (str
    "/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n *\n * @format\n */\n\"use strict\";\n\nfunction _objectWithoutProperties(source, excluded) {\n  if (source == null) return {};\n  var target = _objectWithoutPropertiesLoose(source, excluded);\n  var key, i;\n  if (Object.getOwnPropertySymbols) {\n    var sourceSymbolKeys = Object.getOwnPropertySymbols(source);\n    for (i = 0; i < sourceSymbolKeys.length; i++) {\n      key = sourceSymbolKeys[i];\n      if (excluded.indexOf(key) >= 0) continue;\n      if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;\n      target[key] = source[key];\n    }\n  }\n  return target;\n}\n\nfunction _objectWithoutPropertiesLoose(source, excluded) {\n  if (source == null) return {};\n  var target = {};\n  var sourceKeys = Object.keys(source);\n  var key, i;\n  for (i = 0; i < sourceKeys.length; i++) {\n    key = sourceKeys[i];\n    if (excluded.indexOf(key) >= 0) continue;\n    target[key] = source[key];\n  }\n  return target;\n}\n\nfunction _objectSpread(target) {\n  for (var i = 1; i < arguments.length; i++) {\n    var source = arguments[i] != null ? arguments[i] : {};\n    var ownKeys = Object.keys(source);\n    if (typeof Object.getOwnPropertySymbols === \"function\") {\n      ownKeys = ownKeys.concat(\n        Object.getOwnPropertySymbols(source).filter(function(sym) {\n          return Object.getOwnPropertyDescriptor(source, sym).enumerable;\n        })\n      );\n    }\n    ownKeys.forEach(function(key) {\n      _defineProperty(target, key, source[key]);\n    });\n  }\n  return target;\n}\n\nfunction _defineProperty(obj, key, value) {\n  if (key in obj) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n  } else {\n    obj[key] = value;\n  }\n  return obj;\n}\n\nfunction asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {\n  try {\n    var info = gen[key](arg);\n    var value = info.value;\n  } catch (error) {\n    reject(error);\n    return;\n  }\n  if (info.done) {\n    resolve(value);\n  } else {\n    Promise.resolve(value).then(_next, _throw);\n  }\n}\n\nfunction _asyncToGenerator(fn) {\n  return function() {\n    var self = this,\n      args = arguments;\n    return new Promise(function(resolve, reject) {\n      var gen = fn.apply(self, args);\n      function _next(value) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"next\", value);\n      }\n      function _throw(err) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"throw\", err);\n      }\n      _next(undefined);\n    });\n  };\n}\n\nconst JsFileWrapping = require(\"../ModuleGraph/worker/JsFileWrapping\");\n\nconst assetTransformer = require(\"../assetTransformer\");\n\nconst babylon = require(\"@babel/parser\");\n\nconst collectDependencies = require(\"../ModuleGraph/worker/collectDependencies\");\n\nconst constantFoldingPlugin = require(\"./worker/constant-folding-plugin\");\n\nconst generateImportNames = require(\"../ModuleGraph/worker/generateImportNames\");\n\nconst generate = require(\"@babel/generator\").default;\n\nconst getKeyFromFiles = require(\"../lib/getKeyFromFiles\");\n\nconst getMinifier = require(\"../lib/getMinifier\");\n\nconst importExportPlugin = require(\"./worker/import-export-plugin\");\n\nconst inlinePlugin = require(\"./worker/inline-plugin\");\n\nconst inlineRequiresPlugin = require(\"babel-preset-fbjs/plugins/inline-requires\");\n\nconst normalizePseudoglobals = require(\"./worker/normalizePseudoglobals\");\n\nconst _require = require(\"@babel/core\"),\n  transformFromAstSync = _require.transformFromAstSync;\n\nconst _require2 = require(\"metro-cache\"),\n  stableHash = _require2.stableHash;\n\nconst types = require(\"@babel/types\");\n\nconst countLines = require(\"../lib/countLines\");\n\nconst _require3 = require(\"metro-source-map\"),\n  fromRawMappings = _require3.fromRawMappings,\n  toBabelSegments = _require3.toBabelSegments,\n  toSegmentTuple = _require3.toSegmentTuple;\n\nfunction getDynamicDepsBehavior(inPackages, filename) {\n  switch (inPackages) {\n    case \"reject\":\n      return \"reject\";\n\n    case \"throwAtRuntime\":\n      const isPackage = /(?:^|[/\\\\])node_modules[/\\\\]/.test(filename);\n      return isPackage ? inPackages : \"reject\";\n\n    default:\n      inPackages;\n      throw new Error(\n        `invalid value for dynamic deps behavior: \\`${inPackages}\\``\n      );\n  }\n}\n\nclass JsTransformer {\n  constructor(projectRoot, config) {\n    this._projectRoot = projectRoot;\n    this._config = config;\n  }\n\n  transform(filename, data, options) {\n    var _this = this;\n\n    return _asyncToGenerator(function*() {\n      const sourceCode = data.toString(\"utf8\");\n      let type = \"js/module\";\n\n      if (options.type === \"asset\") {\n        type = \"js/module/asset\";\n      }\n\n      if (options.type === \"script\") {\n        type = \"js/script\";\n      }\n\n      if (filename.endsWith(\".json\")) {\n        let code = JsFileWrapping.wrapJson(sourceCode);\n        let map = [];\n\n        if (options.minify) {\n          var _ref = yield _this._minifyCode(filename, code, sourceCode, map);\n\n          map = _ref.map;\n          code = _ref.code;\n        }\n\n        return {\n          dependencies: [],\n          output: [\n            {\n              data: {\n                code,\n                lineCount: countLines(code),\n                map,\n                functionMap: null\n              },\n              type\n            }\n          ]\n        };\n      } // $FlowFixMe TODO t26372934 Plugin system\n\n      const transformer = require(_this._config.babelTransformerPath);\n\n      const transformerArgs = {\n        filename,\n        options: _objectSpread({}, options, {\n          enableBabelRCLookup: _this._config.enableBabelRCLookup,\n          enableBabelRuntime: _this._config.enableBabelRuntime,\n          // Inline requires are now performed at a secondary step. We cannot\n          // unfortunately remove it from the internal transformer, since this one\n          // is used by other tooling, and this would affect it.\n          inlineRequires: false,\n          projectRoot: _this._projectRoot,\n          publicPath: _this._config.publicPath\n        }),\n        plugins: [],\n        src: sourceCode\n      };\n      const transformResult =\n        type === \"js/module/asset\"\n          ? _objectSpread(\n              {},\n              yield assetTransformer.transform(\n                transformerArgs,\n                _this._config.assetRegistryPath,\n                _this._config.assetPlugins\n              ),\n              {\n                functionMap: null\n              }\n            )\n          : yield transformer.transform(transformerArgs); // Transformers can ouptut null ASTs (if they ignore the file). In that case\n      // we need to parse the module source code to get their AST.\n\n      let ast =\n        transformResult.ast ||\n        babylon.parse(sourceCode, {\n          sourceType: \"unambiguous\"\n        });\n\n      const _generateImportNames = generateImportNames(ast),\n        importDefault = _generateImportNames.importDefault,\n        importAll = _generateImportNames.importAll; // Add \"use strict\" if the file was parsed as a module, and the directive did\n      // not exist yet.\n\n      const directives = ast.program.directives;\n\n      if (\n        ast.program.sourceType === \"module\" &&\n        directives.findIndex(d => d.value.value === \"use strict\") === -1\n      ) {\n        directives.push(types.directive(types.directiveLiteral(\"use strict\")));\n      } // Perform the import-export transform (in case it's still needed), then\n      // fold requires and perform constant folding (if in dev).\n\n      const plugins = [];\n\n      const opts = _objectSpread({}, options, {\n        inlineableCalls: [importDefault, importAll],\n        importDefault,\n        importAll\n      });\n\n      if (options.experimentalImportSupport) {\n        plugins.push([importExportPlugin, opts]);\n      }\n\n      if (options.inlineRequires) {\n        plugins.push([inlineRequiresPlugin, opts]);\n      }\n\n      if (!options.dev) {\n        if (filename === \""
    my-production-index-js-file-name
    "\")\n          console.log(\"======= CUSTOM PATCH @chpill ======== IGNORING CONSTANT FOLDING FOR\", filename);\n        else\n          plugins.push([constantFoldingPlugin, opts]);\n      }\n\n      plugins.push([inlinePlugin, opts]);\n\n      var _transformFromAstSync = transformFromAstSync(ast, \"\", {\n        ast: true,\n        babelrc: false,\n        code: false,\n        configFile: false,\n        comments: false,\n        compact: false,\n        filename,\n        plugins,\n        sourceMaps: false\n      });\n\n      ast = _transformFromAstSync.ast;\n      let dependencyMapName = \"\";\n      let dependencies;\n      let wrappedAst; // If the module to transform is a script (meaning that is not part of the\n      // dependency graph and it code will just be prepended to the bundle modules),\n      // we need to wrap it differently than a commonJS module (also, scripts do\n      // not have dependencies).\n\n      if (type === \"js/script\") {\n        dependencies = [];\n        wrappedAst = JsFileWrapping.wrapPolyfill(ast);\n      } else {\n        try {\n          const opts = {\n            asyncRequireModulePath: _this._config.asyncRequireModulePath,\n            dynamicRequires: getDynamicDepsBehavior(\n              _this._config.dynamicDepsInPackages,\n              filename\n            ),\n            inlineableCalls: [importDefault, importAll],\n            keepRequireNames: options.dev\n          };\n\n          var _collectDependencies = collectDependencies(ast, opts);\n\n          ast = _collectDependencies.ast;\n          dependencies = _collectDependencies.dependencies;\n          dependencyMapName = _collectDependencies.dependencyMapName;\n        } catch (error) {\n          if (error instanceof collectDependencies.InvalidRequireCallError) {\n            throw new InvalidRequireCallError(error, filename);\n          }\n\n          throw error;\n        }\n\n        var _JsFileWrapping$wrapM = JsFileWrapping.wrapModule(\n          ast,\n          importDefault,\n          importAll,\n          dependencyMapName\n        );\n\n        wrappedAst = _JsFileWrapping$wrapM.ast;\n      }\n\n      const reserved =\n        options.minify && data.length <= _this._config.optimizationSizeLimit\n          ? normalizePseudoglobals(wrappedAst)\n          : [];\n      const result = generate(\n        wrappedAst,\n        {\n          comments: false,\n          compact: false,\n          filename,\n          retainLines: false,\n          sourceFileName: filename,\n          sourceMaps: true\n        },\n        sourceCode\n      );\n      let map = result.rawMappings\n        ? result.rawMappings.map(toSegmentTuple)\n        : [];\n      let code = result.code;\n\n      if (options.minify) {\n        var _ref2 = yield _this._minifyCode(\n          filename,\n          result.code,\n          sourceCode,\n          map,\n          reserved\n        );\n\n        map = _ref2.map;\n        code = _ref2.code;\n      }\n\n      const functionMap = transformResult.functionMap;\n      return {\n        dependencies,\n        output: [\n          {\n            data: {\n              code,\n              lineCount: countLines(code),\n              map,\n              functionMap\n            },\n            type\n          }\n        ]\n      };\n    })();\n  }\n\n  _minifyCode(filename, code, source, map) {\n    var _this2 = this;\n\n    let reserved =\n      arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : [];\n    return _asyncToGenerator(function*() {\n      const sourceMap = fromRawMappings([\n        {\n          code,\n          source,\n          map,\n          functionMap: null,\n          path: filename\n        }\n      ]).toMap(undefined, {});\n      const minify = getMinifier(_this2._config.minifierPath);\n\n      try {\n        const minified = minify({\n          code,\n          map: sourceMap,\n          filename,\n          reserved,\n          config: _this2._config.minifierConfig\n        });\n        return {\n          code: minified.code,\n          map: minified.map\n            ? toBabelSegments(minified.map).map(toSegmentTuple)\n            : []\n        };\n      } catch (error) {\n        if (error.constructor.name === \"JS_Parse_Error\") {\n          throw new Error(\n            `${error.message} in file ${filename} at ${error.line}:${error.col}`\n          );\n        }\n\n        throw error;\n      }\n    })();\n  }\n\n  getCacheKey() {\n    const _this$_config = this._config,\n      babelTransformerPath = _this$_config.babelTransformerPath,\n      minifierPath = _this$_config.minifierPath,\n      config = _objectWithoutProperties(_this$_config, [\n        \"babelTransformerPath\",\n        \"minifierPath\"\n      ]);\n\n    const filesKey = getKeyFromFiles([\n      require.resolve(babelTransformerPath),\n      require.resolve(minifierPath),\n      require.resolve(\"../ModuleGraph/worker/JsFileWrapping\"),\n      require.resolve(\"../assetTransformer\"),\n      require.resolve(\"../ModuleGraph/worker/collectDependencies\"),\n      require.resolve(\"./worker/constant-folding-plugin\"),\n      require.resolve(\"../lib/getMinifier\"),\n      require.resolve(\"./worker/inline-plugin\"),\n      require.resolve(\"./worker/import-export-plugin\"),\n      require.resolve(\"./worker/normalizePseudoglobals\"),\n      require.resolve(\"../ModuleGraph/worker/optimizeDependencies\"),\n      require.resolve(\"../ModuleGraph/worker/generateImportNames\")\n    ]);\n\n    const babelTransformer = require(babelTransformerPath);\n\n    const babelTransformerKey = babelTransformer.getCacheKey\n      ? babelTransformer.getCacheKey()\n      : \"\";\n    return [\n      filesKey,\n      stableHash(config).toString(\"hex\"),\n      babelTransformerKey\n    ].join(\"$\");\n  }\n}\n\nclass InvalidRequireCallError extends Error {\n  constructor(innerError, filename) {\n    super(`${filename}:${innerError.message}`);\n    this.innerError = innerError;\n    this.filename = filename;\n  }\n}\n\nmodule.exports = JsTransformer;\n"))


(def file-path "node_modules/metro/src/JSTransformer/worker.js")


(defn apply-patch []
  (println "Patching...")
  ;write to file
  (spit file-path file-patched)
  (if (= file-patched (slurp file-path))
    (println "Patch success!")
    (println "Patching failed. Check" file-path "write permissions.")))

(defn main []
  (let [file-content (slurp file-path)]
    (cond
      (= file-content file-patched) (println file-path "already patched.")
      (= file-content file-original) (do
                                       (println file-path " needs patching...")
                                       (apply-patch))
      :else (println "Cannot patch because" file-path "does not match original."))))

(main)