projecte_ionic/node_modules/@angular/compiler-cli/ngcc/src/packages/entry_point.js
2022-02-09 18:30:03 +01:00

267 lines
40 KiB
JavaScript
Executable file

(function (factory) {
if (typeof module === "object" && typeof module.exports === "object") {
var v = factory(require, exports);
if (v !== undefined) module.exports = v;
}
else if (typeof define === "function" && define.amd) {
define("@angular/compiler-cli/ngcc/src/packages/entry_point", ["require", "exports", "tslib", "typescript", "@angular/compiler-cli/ngcc/src/host/umd_host", "@angular/compiler-cli/ngcc/src/utils"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getEntryPointFormat = exports.isEntryPoint = exports.getEntryPointInfo = exports.INCOMPATIBLE_ENTRY_POINT = exports.IGNORED_ENTRY_POINT = exports.NO_ENTRY_POINT = exports.SUPPORTED_FORMAT_PROPERTIES = void 0;
var tslib_1 = require("tslib");
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
var ts = require("typescript");
var umd_host_1 = require("@angular/compiler-cli/ngcc/src/host/umd_host");
var utils_1 = require("@angular/compiler-cli/ngcc/src/utils");
// We need to keep the elements of this const and the `EntryPointJsonProperty` type in sync.
exports.SUPPORTED_FORMAT_PROPERTIES = ['fesm2015', 'fesm5', 'es2015', 'esm2015', 'esm5', 'main', 'module', 'browser'];
/**
* The path does not represent an entry-point, i.e. there is no package.json at the path and there
* is no config to force an entry-point.
*/
exports.NO_ENTRY_POINT = 'no-entry-point';
/**
* The path represents an entry-point that is `ignored` by an ngcc config.
*/
exports.IGNORED_ENTRY_POINT = 'ignored-entry-point';
/**
* The path has a package.json, but it is not a valid entry-point for ngcc processing.
*/
exports.INCOMPATIBLE_ENTRY_POINT = 'incompatible-entry-point';
/**
* Try to create an entry-point from the given paths and properties.
*
* @param packagePath the absolute path to the containing npm package
* @param entryPointPath the absolute path to the potential entry-point.
* @returns
* - An entry-point if it is valid and not ignored.
* - `NO_ENTRY_POINT` when there is no package.json at the path and there is no config to force an
* entry-point,
* - `IGNORED_ENTRY_POINT` when the entry-point is ignored by an ngcc config.
* - `INCOMPATIBLE_ENTRY_POINT` when there is a package.json but it is not a valid Angular compiled
* entry-point.
*/
function getEntryPointInfo(fs, config, logger, packagePath, entryPointPath) {
var packagePackageJsonPath = fs.resolve(packagePath, 'package.json');
var entryPointPackageJsonPath = fs.resolve(entryPointPath, 'package.json');
var loadedPackagePackageJson = loadPackageJson(fs, packagePackageJsonPath);
var loadedEntryPointPackageJson = (packagePackageJsonPath === entryPointPackageJsonPath) ?
loadedPackagePackageJson :
loadPackageJson(fs, entryPointPackageJsonPath);
var _a = getPackageNameAndVersion(fs, packagePath, loadedPackagePackageJson, loadedEntryPointPackageJson), packageName = _a.packageName, packageVersion = _a.packageVersion;
var packageConfig = config.getPackageConfig(packageName, packagePath, packageVersion);
var entryPointConfig = packageConfig.entryPoints.get(entryPointPath);
var entryPointPackageJson;
if (entryPointConfig === undefined) {
if (!fs.exists(entryPointPackageJsonPath)) {
// No `package.json` and no config.
return exports.NO_ENTRY_POINT;
}
else if (loadedEntryPointPackageJson === null) {
// `package.json` exists but could not be parsed and there is no redeeming config.
logger.warn("Failed to read entry point info from invalid 'package.json' file: " + entryPointPackageJsonPath);
return exports.INCOMPATIBLE_ENTRY_POINT;
}
else {
entryPointPackageJson = loadedEntryPointPackageJson;
}
}
else if (entryPointConfig.ignore === true) {
// Explicitly ignored entry-point.
return exports.IGNORED_ENTRY_POINT;
}
else {
entryPointPackageJson = mergeConfigAndPackageJson(fs, loadedEntryPointPackageJson, entryPointConfig, packagePath, entryPointPath);
}
var typings = entryPointPackageJson.typings || entryPointPackageJson.types ||
guessTypingsFromPackageJson(fs, entryPointPath, entryPointPackageJson);
if (typeof typings !== 'string') {
// Missing the required `typings` property
return exports.INCOMPATIBLE_ENTRY_POINT;
}
// An entry-point is assumed to be compiled by Angular if there is either:
// * a `metadata.json` file next to the typings entry-point
// * a custom config for this entry-point
var metadataPath = fs.resolve(entryPointPath, typings.replace(/\.d\.ts$/, '') + '.metadata.json');
var compiledByAngular = entryPointConfig !== undefined || fs.exists(metadataPath);
var entryPointInfo = {
name: entryPointPackageJson.name,
path: entryPointPath,
packageName: packageName,
packagePath: packagePath,
packageJson: entryPointPackageJson,
typings: fs.resolve(entryPointPath, typings),
compiledByAngular: compiledByAngular,
ignoreMissingDependencies: entryPointConfig !== undefined ? !!entryPointConfig.ignoreMissingDependencies : false,
generateDeepReexports: entryPointConfig !== undefined ? !!entryPointConfig.generateDeepReexports : false,
};
return entryPointInfo;
}
exports.getEntryPointInfo = getEntryPointInfo;
function isEntryPoint(result) {
return result !== exports.NO_ENTRY_POINT && result !== exports.INCOMPATIBLE_ENTRY_POINT &&
result !== exports.IGNORED_ENTRY_POINT;
}
exports.isEntryPoint = isEntryPoint;
/**
* Convert a package.json property into an entry-point format.
*
* @param property The property to convert to a format.
* @returns An entry-point format or `undefined` if none match the given property.
*/
function getEntryPointFormat(fs, entryPoint, property) {
switch (property) {
case 'fesm2015':
return 'esm2015';
case 'fesm5':
return 'esm5';
case 'es2015':
return 'esm2015';
case 'esm2015':
return 'esm2015';
case 'esm5':
return 'esm5';
case 'browser':
var browserFile = entryPoint.packageJson['browser'];
if (typeof browserFile !== 'string') {
return undefined;
}
return sniffModuleFormat(fs, fs.join(entryPoint.path, browserFile));
case 'main':
var mainFile = entryPoint.packageJson['main'];
if (mainFile === undefined) {
return undefined;
}
return sniffModuleFormat(fs, fs.join(entryPoint.path, mainFile));
case 'module':
var moduleFilePath = entryPoint.packageJson['module'];
// As of version 10, the `module` property in `package.json` should point to
// the ESM2015 format output as per Angular Package format specification. This
// means that the `module` property captures multiple formats, as old libraries
// built with the old APF can still be processed. We detect the format by checking
// the paths that should be used as per APF specification.
if (typeof moduleFilePath === 'string' && moduleFilePath.includes('esm2015')) {
return "esm2015";
}
return 'esm5';
default:
return undefined;
}
}
exports.getEntryPointFormat = getEntryPointFormat;
/**
* Parse the JSON from a `package.json` file.
* @param packageJsonPath the absolute path to the `package.json` file.
* @returns JSON from the `package.json` file if it is valid, `null` otherwise.
*/
function loadPackageJson(fs, packageJsonPath) {
try {
return JSON.parse(fs.readFile(packageJsonPath));
}
catch (_a) {
return null;
}
}
function sniffModuleFormat(fs, sourceFilePath) {
var resolvedPath = utils_1.resolveFileWithPostfixes(fs, sourceFilePath, ['', '.js', '/index.js']);
if (resolvedPath === null) {
return undefined;
}
var sourceFile = ts.createSourceFile(sourceFilePath, fs.readFile(resolvedPath), ts.ScriptTarget.ES5);
if (sourceFile.statements.length === 0) {
return undefined;
}
if (ts.isExternalModule(sourceFile)) {
return 'esm5';
}
else if (umd_host_1.parseStatementForUmdModule(sourceFile.statements[0]) !== null) {
return 'umd';
}
else {
return 'commonjs';
}
}
function mergeConfigAndPackageJson(fs, entryPointPackageJson, entryPointConfig, packagePath, entryPointPath) {
if (entryPointPackageJson !== null) {
return tslib_1.__assign(tslib_1.__assign({}, entryPointPackageJson), entryPointConfig.override);
}
else {
var name = fs.basename(packagePath) + "/" + fs.relative(packagePath, entryPointPath);
return tslib_1.__assign({ name: name }, entryPointConfig.override);
}
}
function guessTypingsFromPackageJson(fs, entryPointPath, entryPointPackageJson) {
var e_1, _a;
try {
for (var SUPPORTED_FORMAT_PROPERTIES_1 = tslib_1.__values(exports.SUPPORTED_FORMAT_PROPERTIES), SUPPORTED_FORMAT_PROPERTIES_1_1 = SUPPORTED_FORMAT_PROPERTIES_1.next(); !SUPPORTED_FORMAT_PROPERTIES_1_1.done; SUPPORTED_FORMAT_PROPERTIES_1_1 = SUPPORTED_FORMAT_PROPERTIES_1.next()) {
var prop = SUPPORTED_FORMAT_PROPERTIES_1_1.value;
var field = entryPointPackageJson[prop];
if (typeof field !== 'string') {
// Some crazy packages have things like arrays in these fields!
continue;
}
var relativeTypingsPath = field.replace(/\.js$/, '.d.ts');
var typingsPath = fs.resolve(entryPointPath, relativeTypingsPath);
if (fs.exists(typingsPath)) {
return typingsPath;
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (SUPPORTED_FORMAT_PROPERTIES_1_1 && !SUPPORTED_FORMAT_PROPERTIES_1_1.done && (_a = SUPPORTED_FORMAT_PROPERTIES_1.return)) _a.call(SUPPORTED_FORMAT_PROPERTIES_1);
}
finally { if (e_1) throw e_1.error; }
}
return null;
}
/**
* Find or infer the name and version of a package.
*
* - The name is computed based on the `name` property of the package's or the entry-point's
* `package.json` file (if available) or inferred from the package's path.
* - The version is read off of the `version` property of the package's `package.json` file (if
* available).
*
* @param fs The file-system to use for processing `packagePath`.
* @param packagePath the absolute path to the package.
* @param packagePackageJson the parsed `package.json` of the package (if available).
* @param entryPointPackageJson the parsed `package.json` of an entry-point (if available).
* @returns the computed name and version of the package.
*/
function getPackageNameAndVersion(fs, packagePath, packagePackageJson, entryPointPackageJson) {
var _a;
var packageName;
if (packagePackageJson !== null) {
// We have a valid `package.json` for the package: Get the package name from that.
packageName = packagePackageJson.name;
}
else if (entryPointPackageJson !== null) {
// We have a valid `package.json` for the entry-point: Get the package name from that.
// This might be a secondary entry-point, so make sure we only keep the main package's name
// (e.g. only keep `@angular/common` from `@angular/common/http`).
packageName = /^(?:@[^/]+\/)?[^/]*/.exec(entryPointPackageJson.name)[0];
}
else {
// We don't have a valid `package.json`: Infer the package name from the package's path.
var lastSegment = fs.basename(packagePath);
var secondLastSegment = fs.basename(fs.dirname(packagePath));
packageName =
secondLastSegment.startsWith('@') ? secondLastSegment + "/" + lastSegment : lastSegment;
}
return {
packageName: packageName,
packageVersion: (_a = packagePackageJson === null || packagePackageJson === void 0 ? void 0 : packagePackageJson.version) !== null && _a !== void 0 ? _a : null,
};
}
});
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport * as ts from 'typescript';\n\nimport {AbsoluteFsPath, PathManipulation, ReadonlyFileSystem} from '../../../src/ngtsc/file_system';\nimport {Logger} from '../../../src/ngtsc/logging';\nimport {parseStatementForUmdModule} from '../host/umd_host';\nimport {resolveFileWithPostfixes} from '../utils';\n\nimport {NgccConfiguration, NgccEntryPointConfig} from './configuration';\n\n/**\n * The possible values for the format of an entry-point.\n */\nexport type EntryPointFormat = 'esm5'|'esm2015'|'umd'|'commonjs';\n\n/**\n * An object containing information about an entry-point, including paths\n * to each of the possible entry-point formats.\n */\nexport interface EntryPoint extends JsonObject {\n  /** The name of the entry-point (e.g. `@angular/core` or `@angular/common/http`). */\n  name: string;\n  /** The path to this entry point. */\n  path: AbsoluteFsPath;\n  /**\n   * The name of the package that contains this entry-point (e.g. `@angular/core` or\n   * `@angular/common`).\n   */\n  packageName: string;\n  /** The path to the package that contains this entry-point. */\n  packagePath: AbsoluteFsPath;\n  /** The parsed package.json file for this entry-point. */\n  packageJson: EntryPointPackageJson;\n  /** The path to a typings (.d.ts) file for this entry-point. */\n  typings: AbsoluteFsPath;\n  /** Is this EntryPoint compiled with the Angular View Engine compiler? */\n  compiledByAngular: boolean;\n  /** Should ngcc ignore missing dependencies and process this entrypoint anyway? */\n  ignoreMissingDependencies: boolean;\n  /** Should ngcc generate deep re-exports for this entrypoint? */\n  generateDeepReexports: boolean;\n}\n\nexport type JsonPrimitive = string|number|boolean|null;\nexport type JsonValue = JsonPrimitive|JsonArray|JsonObject|undefined;\nexport interface JsonArray extends Array<JsonValue> {}\nexport interface JsonObject {\n  [key: string]: JsonValue;\n}\n\nexport interface PackageJsonFormatPropertiesMap {\n  browser?: string;\n  fesm2015?: string;\n  fesm5?: string;\n  es2015?: string;  // if exists then it is actually FESM2015\n  esm2015?: string;\n  esm5?: string;\n  main?: string;     // UMD\n  module?: string;   // if exists then it is actually FESM5\n  types?: string;    // Synonymous to `typings` property - see https://bit.ly/2OgWp2H\n  typings?: string;  // TypeScript .d.ts files\n}\n\nexport type PackageJsonFormatProperties = keyof PackageJsonFormatPropertiesMap;\n\n/**\n * The properties that may be loaded from the `package.json` file.\n */\nexport interface EntryPointPackageJson extends JsonObject, PackageJsonFormatPropertiesMap {\n  name: string;\n  version?: string;\n  scripts?: Record<string, string>;\n  __processed_by_ivy_ngcc__?: Record<string, string>;\n}\n\nexport type EntryPointJsonProperty = Exclude<PackageJsonFormatProperties, 'types'|'typings'>;\n// We need to keep the elements of this const and the `EntryPointJsonProperty` type in sync.\nexport const SUPPORTED_FORMAT_PROPERTIES: EntryPointJsonProperty[] =\n    ['fesm2015', 'fesm5', 'es2015', 'esm2015', 'esm5', 'main', 'module', 'browser'];\n\n\n/**\n * The path does not represent an entry-point, i.e. there is no package.json at the path and there\n * is no config to force an entry-point.\n */\nexport const NO_ENTRY_POINT = 'no-entry-point';\n\n/**\n * The path represents an entry-point that is `ignored` by an ngcc config.\n */\nexport const IGNORED_ENTRY_POINT = 'ignored-entry-point';\n\n/**\n * The path has a package.json, but it is not a valid entry-point for ngcc processing.\n */\nexport const INCOMPATIBLE_ENTRY_POINT = 'incompatible-entry-point';\n\n/**\n * The result of calling `getEntryPointInfo()`.\n *\n * This will be an `EntryPoint` object if an Angular entry-point was identified;\n * Otherwise it will be a flag indicating one of:\n * * NO_ENTRY_POINT - the path is not an entry-point or ngcc is configured to ignore it\n * * INCOMPATIBLE_ENTRY_POINT - the path was a non-processable entry-point that should be searched\n * for sub-entry-points\n */\nexport type GetEntryPointResult =\n    EntryPoint|typeof IGNORED_ENTRY_POINT|typeof INCOMPATIBLE_ENTRY_POINT|typeof NO_ENTRY_POINT;\n\n\n/**\n * Try to create an entry-point from the given paths and properties.\n *\n * @param packagePath the absolute path to the containing npm package\n * @param entryPointPath the absolute path to the potential entry-point.\n * @returns\n * - An entry-point if it is valid and not ignored.\n * - `NO_ENTRY_POINT` when there is no package.json at the path and there is no config to force an\n *   entry-point,\n * - `IGNORED_ENTRY_POINT` when the entry-point is ignored by an ngcc config.\n * - `INCOMPATIBLE_ENTRY_POINT` when there is a package.json but it is not a valid Angular compiled\n *   entry-point.\n */\nexport function getEntryPointInfo(\n    fs: ReadonlyFileSystem, config: NgccConfiguration, logger: Logger, packagePath: AbsoluteFsPath,\n    entryPointPath: AbsoluteFsPath): GetEntryPointResult {\n  const packagePackageJsonPath = fs.resolve(packagePath, 'package.json');\n  const entryPointPackageJsonPath = fs.resolve(entryPointPath, 'package.json');\n  const loadedPackagePackageJson = loadPackageJson(fs, packagePackageJsonPath);\n  const loadedEntryPointPackageJson = (packagePackageJsonPath === entryPointPackageJsonPath) ?\n      loadedPackagePackageJson :\n      loadPackageJson(fs, entryPointPackageJsonPath);\n  const {packageName, packageVersion} = getPackageNameAndVersion(\n      fs, packagePath, loadedPackagePackageJson, loadedEntryPointPackageJson);\n\n  const packageConfig = config.getPackageConfig(packageName, packagePath, packageVersion);\n  const entryPointConfig = packageConfig.entryPoints.get(entryPointPath);\n  let entryPointPackageJson: EntryPointPackageJson;\n\n  if (entryPointConfig === undefined) {\n    if (!fs.exists(entryPointPackageJsonPath)) {\n      // No `package.json` and no config.\n      return NO_ENTRY_POINT;\n    } else if (loadedEntryPointPackageJson === null) {\n      // `package.json` exists but could not be parsed and there is no redeeming config.\n      logger.warn(`Failed to read entry point info from invalid 'package.json' file: ${\n          entryPointPackageJsonPath}`);\n\n      return INCOMPATIBLE_ENTRY_POINT;\n    } else {\n      entryPointPackageJson = loadedEntryPointPackageJson;\n    }\n  } else if (entryPointConfig.ignore === true) {\n    // Explicitly ignored entry-point.\n    return IGNORED_ENTRY_POINT;\n  } else {\n    entryPointPackageJson = mergeConfigAndPackageJson(\n        fs, loadedEntryPointPackageJson, entryPointConfig, packagePath, entryPointPath);\n  }\n\n  const typings = entryPointPackageJson.typings || entryPointPackageJson.types ||\n      guessTypingsFromPackageJson(fs, entryPointPath, entryPointPackageJson);\n  if (typeof typings !== 'string') {\n    // Missing the required `typings` property\n    return INCOMPATIBLE_ENTRY_POINT;\n  }\n\n  // An entry-point is assumed to be compiled by Angular if there is either:\n  // * a `metadata.json` file next to the typings entry-point\n  // * a custom config for this entry-point\n  const metadataPath =\n      fs.resolve(entryPointPath, typings.replace(/\\.d\\.ts$/, '') + '.metadata.json');\n  const compiledByAngular = entryPointConfig !== undefined || fs.exists(metadataPath);\n\n  const entryPointInfo: EntryPoint = {\n    name: entryPointPackageJson.name,\n    path: entryPointPath,\n    packageName,\n    packagePath,\n    packageJson: entryPointPackageJson,\n    typings: fs.resolve(entryPointPath, typings),\n    compiledByAngular,\n    ignoreMissingDependencies:\n        entryPointConfig !== undefined ? !!entryPointConfig.ignoreMissingDependencies : false,\n    generateDeepReexports:\n        entryPointConfig !== undefined ? !!entryPointConfig.generateDeepReexports : false,\n  };\n\n  return entryPointInfo;\n}\n\nexport function isEntryPoint(result: GetEntryPointResult): result is EntryPoint {\n  return result !== NO_ENTRY_POINT && result !== INCOMPATIBLE_ENTRY_POINT &&\n      result !== IGNORED_ENTRY_POINT;\n}\n\n/**\n * Convert a package.json property into an entry-point format.\n *\n * @param property The property to convert to a format.\n * @returns An entry-point format or `undefined` if none match the given property.\n */\nexport function getEntryPointFormat(\n    fs: ReadonlyFileSystem, entryPoint: EntryPoint,\n    property: EntryPointJsonProperty): EntryPointFormat|undefined {\n  switch (property) {\n    case 'fesm2015':\n      return 'esm2015';\n    case 'fesm5':\n      return 'esm5';\n    case 'es2015':\n      return 'esm2015';\n    case 'esm2015':\n      return 'esm2015';\n    case 'esm5':\n      return 'esm5';\n    case 'browser':\n      const browserFile = entryPoint.packageJson['browser'];\n      if (typeof browserFile !== 'string') {\n        return undefined;\n      }\n      return sniffModuleFormat(fs, fs.join(entryPoint.path, browserFile));\n    case 'main':\n      const mainFile = entryPoint.packageJson['main'];\n      if (mainFile === undefined) {\n        return undefined;\n      }\n      return sniffModuleFormat(fs, fs.join(entryPoint.path, mainFile));\n    case 'module':\n      const moduleFilePath = entryPoint.packageJson['module'];\n      // As of version 10, the `module` property in `package.json` should point to\n      // the ESM2015 format output as per Angular Package format specification. This\n      // means that the `module` property captures multiple formats, as old libraries\n      // built with the old APF can still be processed. We detect the format by checking\n      // the paths that should be used as per APF specification.\n      if (typeof moduleFilePath === 'string' && moduleFilePath.includes('esm2015')) {\n        return `esm2015`;\n      }\n      return 'esm5';\n    default:\n      return undefined;\n  }\n}\n\n/**\n * Parse the JSON from a `package.json` file.\n * @param packageJsonPath the absolute path to the `package.json` file.\n * @returns JSON from the `package.json` file if it is valid, `null` otherwise.\n */\nfunction loadPackageJson(\n    fs: ReadonlyFileSystem, packageJsonPath: AbsoluteFsPath): EntryPointPackageJson|null {\n  try {\n    return JSON.parse(fs.readFile(packageJsonPath)) as EntryPointPackageJson;\n  } catch {\n    return null;\n  }\n}\n\nfunction sniffModuleFormat(\n    fs: ReadonlyFileSystem, sourceFilePath: AbsoluteFsPath): EntryPointFormat|undefined {\n  const resolvedPath = resolveFileWithPostfixes(fs, sourceFilePath, ['', '.js', '/index.js']);\n  if (resolvedPath === null) {\n    return undefined;\n  }\n\n  const sourceFile =\n      ts.createSourceFile(sourceFilePath, fs.readFile(resolvedPath), ts.ScriptTarget.ES5);\n  if (sourceFile.statements.length === 0) {\n    return undefined;\n  }\n  if (ts.isExternalModule(sourceFile)) {\n    return 'esm5';\n  } else if (parseStatementForUmdModule(sourceFile.statements[0]) !== null) {\n    return 'umd';\n  } else {\n    return 'commonjs';\n  }\n}\n\nfunction mergeConfigAndPackageJson(\n    fs: PathManipulation, entryPointPackageJson: EntryPointPackageJson|null,\n    entryPointConfig: NgccEntryPointConfig, packagePath: AbsoluteFsPath,\n    entryPointPath: AbsoluteFsPath): EntryPointPackageJson {\n  if (entryPointPackageJson !== null) {\n    return {...entryPointPackageJson, ...entryPointConfig.override};\n  } else {\n    const name = `${fs.basename(packagePath)}/${fs.relative(packagePath, entryPointPath)}`;\n    return {name, ...entryPointConfig.override};\n  }\n}\n\nfunction guessTypingsFromPackageJson(\n    fs: ReadonlyFileSystem, entryPointPath: AbsoluteFsPath,\n    entryPointPackageJson: EntryPointPackageJson): AbsoluteFsPath|null {\n  for (const prop of SUPPORTED_FORMAT_PROPERTIES) {\n    const field = entryPointPackageJson[prop];\n    if (typeof field !== 'string') {\n      // Some crazy packages have things like arrays in these fields!\n      continue;\n    }\n    const relativeTypingsPath = field.replace(/\\.js$/, '.d.ts');\n    const typingsPath = fs.resolve(entryPointPath, relativeTypingsPath);\n    if (fs.exists(typingsPath)) {\n      return typingsPath;\n    }\n  }\n  return null;\n}\n\n/**\n * Find or infer the name and version of a package.\n *\n * - The name is computed based on the `name` property of the package's or the entry-point's\n *   `package.json` file (if available) or inferred from the package's path.\n * - The version is read off of the `version` property of the package's `package.json` file (if\n *   available).\n *\n * @param fs The file-system to use for processing `packagePath`.\n * @param packagePath the absolute path to the package.\n * @param packagePackageJson the parsed `package.json` of the package (if available).\n * @param entryPointPackageJson the parsed `package.json` of an entry-point (if available).\n * @returns the computed name and version of the package.\n */\nfunction getPackageNameAndVersion(\n    fs: PathManipulation, packagePath: AbsoluteFsPath,\n    packagePackageJson: EntryPointPackageJson|null,\n    entryPointPackageJson: EntryPointPackageJson|\n    null): {packageName: string, packageVersion: string|null} {\n  let packageName: string;\n\n  if (packagePackageJson !== null) {\n    // We have a valid `package.json` for the package: Get the package name from that.\n    packageName = packagePackageJson.name;\n  } else if (entryPointPackageJson !== null) {\n    // We have a valid `package.json` for the entry-point: Get the package name from that.\n    // This might be a secondary entry-point, so make sure we only keep the main package's name\n    // (e.g. only keep `@angular/common` from `@angular/common/http`).\n    packageName = /^(?:@[^/]+\\/)?[^/]*/.exec(entryPointPackageJson.name)![0];\n  } else {\n    // We don't have a valid `package.json`: Infer the package name from the package's path.\n    const lastSegment = fs.basename(packagePath);\n    const secondLastSegment = fs.basename(fs.dirname(packagePath));\n\n    packageName =\n        secondLastSegment.startsWith('@') ? `${secondLastSegment}/${lastSegment}` : lastSegment;\n  }\n\n  return {\n    packageName,\n    packageVersion: packagePackageJson?.version ?? null,\n  };\n}\n"]}