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Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.\n// See LICENSE in the project root for license information.\n\nimport * as ts from 'typescript';\nimport * as tsdoc from '@microsoft/tsdoc';\nimport {\n  PackageJsonLookup,\n  Sort,\n  InternalError,\n  type INodePackageJson,\n  PackageName\n} from '@rushstack/node-core-library';\nimport { ReleaseTag } from '@microsoft/api-extractor-model';\nimport minimatch from 'minimatch';\n\nimport { ExtractorMessageId } from '../api/ExtractorMessageId';\n\nimport { CollectorEntity } from './CollectorEntity';\nimport { AstSymbolTable } from '../analyzer/AstSymbolTable';\nimport type { AstEntity } from '../analyzer/AstEntity';\nimport type { AstModule, IAstModuleExportInfo } from '../analyzer/AstModule';\nimport { AstSymbol } from '../analyzer/AstSymbol';\nimport type { AstDeclaration } from '../analyzer/AstDeclaration';\nimport { TypeScriptHelpers } from '../analyzer/TypeScriptHelpers';\nimport { WorkingPackage } from './WorkingPackage';\nimport { PackageDocComment } from '../aedoc/PackageDocComment';\nimport { type DeclarationMetadata, InternalDeclarationMetadata } from './DeclarationMetadata';\nimport { ApiItemMetadata, type IApiItemMetadataOptions } from './ApiItemMetadata';\nimport { SymbolMetadata } from './SymbolMetadata';\nimport { TypeScriptInternals, type IGlobalVariableAnalyzer } from '../analyzer/TypeScriptInternals';\nimport type { MessageRouter } from './MessageRouter';\nimport { AstReferenceResolver } from '../analyzer/AstReferenceResolver';\nimport { ExtractorConfig } from '../api/ExtractorConfig';\nimport { AstNamespaceImport } from '../analyzer/AstNamespaceImport';\nimport { AstImport } from '../analyzer/AstImport';\nimport type { SourceMapper } from './SourceMapper';\n\n/**\n * Options for Collector constructor.\n */\nexport interface ICollectorOptions {\n  /**\n   * Configuration for the TypeScript compiler.  The most important options to set are:\n   *\n   * - target: ts.ScriptTarget.ES5\n   * - module: ts.ModuleKind.CommonJS\n   * - moduleResolution: ts.ModuleResolutionKind.NodeJs\n   * - rootDir: inputFolder\n   */\n  program: ts.Program;\n\n  messageRouter: MessageRouter;\n\n  extractorConfig: ExtractorConfig;\n\n  sourceMapper: SourceMapper;\n}\n\n/**\n * The `Collector` manages the overall data set that is used by `ApiModelGenerator`,\n * `DtsRollupGenerator`, and `ApiReportGenerator`.  Starting from the working package's entry point,\n * the `Collector` collects all exported symbols, determines how to import any symbols they reference,\n * assigns unique names, and sorts everything into a normalized alphabetical ordering.\n */\nexport class Collector {\n  public readonly program: ts.Program;\n  public readonly typeChecker: ts.TypeChecker;\n  public readonly globalVariableAnalyzer: IGlobalVariableAnalyzer;\n  public readonly astSymbolTable: AstSymbolTable;\n  public readonly astReferenceResolver: AstReferenceResolver;\n\n  public readonly packageJsonLookup: PackageJsonLookup;\n  public readonly messageRouter: MessageRouter;\n\n  public readonly workingPackage: WorkingPackage;\n\n  public readonly extractorConfig: ExtractorConfig;\n\n  public readonly sourceMapper: SourceMapper;\n\n  /**\n   * The `ExtractorConfig.bundledPackages` names in a set.\n   */\n  public readonly bundledPackageNames: ReadonlySet<string>;\n\n  private readonly _program: ts.Program;\n\n  private readonly _tsdocParser: tsdoc.TSDocParser;\n\n  private _astEntryPoint: AstModule | undefined;\n\n  private readonly _entities: CollectorEntity[] = [];\n  private readonly _entitiesByAstEntity: Map<AstEntity, CollectorEntity> = new Map<\n    AstEntity,\n    CollectorEntity\n  >();\n  private readonly _entitiesBySymbol: Map<ts.Symbol, CollectorEntity> = new Map<ts.Symbol, CollectorEntity>();\n\n  private readonly _starExportedExternalModulePaths: string[] = [];\n\n  private readonly _dtsTypeReferenceDirectives: Set<string> = new Set<string>();\n  private readonly _dtsLibReferenceDirectives: Set<string> = new Set<string>();\n\n  // Used by getOverloadIndex()\n  private readonly _cachedOverloadIndexesByDeclaration: Map<AstDeclaration, number>;\n\n  public constructor(options: ICollectorOptions) {\n    this.packageJsonLookup = new PackageJsonLookup();\n\n    this._program = options.program;\n    this.extractorConfig = options.extractorConfig;\n    this.sourceMapper = options.sourceMapper;\n\n    const entryPointSourceFile: ts.SourceFile | undefined = options.program.getSourceFile(\n      this.extractorConfig.mainEntryPointFilePath\n    );\n\n    if (!entryPointSourceFile) {\n      throw new Error('Unable to load file: ' + this.extractorConfig.mainEntryPointFilePath);\n    }\n\n    if (!this.extractorConfig.packageFolder || !this.extractorConfig.packageJson) {\n      // TODO: We should be able to analyze projects that don't have any package.json.\n      // The ExtractorConfig class is already designed to allow this.\n      throw new Error('Unable to find a package.json file for the project being analyzed');\n    }\n\n    this.workingPackage = new WorkingPackage({\n      packageFolder: this.extractorConfig.packageFolder,\n      packageJson: this.extractorConfig.packageJson,\n      entryPointSourceFile\n    });\n\n    this.messageRouter = options.messageRouter;\n\n    this.program = options.program;\n    this.typeChecker = options.program.getTypeChecker();\n    this.globalVariableAnalyzer = TypeScriptInternals.getGlobalVariableAnalyzer(this.program);\n\n    this._tsdocParser = new tsdoc.TSDocParser(this.extractorConfig.tsdocConfiguration);\n\n    // Resolve package name patterns and store concrete set of bundled package dependency names\n    this.bundledPackageNames = Collector._resolveBundledPackagePatterns(\n      this.extractorConfig.bundledPackages,\n      this.extractorConfig.packageJson\n    );\n\n    this.astSymbolTable = new AstSymbolTable(\n      this.program,\n      this.typeChecker,\n      this.packageJsonLookup,\n      this.bundledPackageNames,\n      this.messageRouter\n    );\n    this.astReferenceResolver = new AstReferenceResolver(this);\n\n    this._cachedOverloadIndexesByDeclaration = new Map<AstDeclaration, number>();\n  }\n\n  /**\n   * Resolve provided `bundledPackages` names and glob patterns to a list of explicit package names.\n   *\n   * @remarks\n   * Explicit package names will be included in the output unconditionally. However, wildcard patterns will\n   * only be matched against the various dependencies listed in the provided package.json (if there was one).\n   * Patterns will be matched against `dependencies`, `devDependencies`, `optionalDependencies`, and `peerDependencies`.\n   *\n   * @param bundledPackages - The list of package names and/or glob patterns to resolve.\n   * @param packageJson - The package.json of the package being processed (if there is one).\n   * @returns The set of resolved package names to be bundled during analysis.\n   */\n  private static _resolveBundledPackagePatterns(\n    bundledPackages: string[],\n    packageJson: INodePackageJson | undefined\n  ): ReadonlySet<string> {\n    if (bundledPackages.length === 0) {\n      // If no `bundledPackages` were specified, then there is nothing to resolve.\n      // Return an empty set.\n      return new Set<string>();\n    }\n\n    // Accumulate all declared dependencies.\n    // Any wildcard patterns in `bundledPackages` will be resolved against these.\n    const dependencyNames: Set<string> = new Set<string>();\n    Object.keys(packageJson?.dependencies ?? {}).forEach((dep) => dependencyNames.add(dep));\n    Object.keys(packageJson?.devDependencies ?? {}).forEach((dep) => dependencyNames.add(dep));\n    Object.keys(packageJson?.peerDependencies ?? {}).forEach((dep) => dependencyNames.add(dep));\n    Object.keys(packageJson?.optionalDependencies ?? {}).forEach((dep) => dependencyNames.add(dep));\n\n    // The set of resolved package names to be populated and returned\n    const resolvedPackageNames: Set<string> = new Set<string>();\n\n    for (const packageNameOrPattern of bundledPackages) {\n      // If the string is an exact package name, use it regardless of package.json contents\n      if (PackageName.isValidName(packageNameOrPattern)) {\n        resolvedPackageNames.add(packageNameOrPattern);\n      } else {\n        // If the entry isn't an exact package name, assume glob pattern and search for matches\n        for (const dependencyName of dependencyNames) {\n          if (minimatch(dependencyName, packageNameOrPattern)) {\n            resolvedPackageNames.add(dependencyName);\n          }\n        }\n      }\n    }\n    return resolvedPackageNames;\n  }\n\n  /**a\n   * Returns a list of names (e.g. \"example-library\") that should appear in a reference like this:\n   *\n   * ```\n   * /// <reference types=\"example-library\" />\n   * ```\n   */\n  public get dtsTypeReferenceDirectives(): ReadonlySet<string> {\n    return this._dtsTypeReferenceDirectives;\n  }\n\n  /**\n   * A list of names (e.g. \"runtime-library\") that should appear in a reference like this:\n   *\n   * ```\n   * /// <reference lib=\"runtime-library\" />\n   * ```\n   */\n  public get dtsLibReferenceDirectives(): ReadonlySet<string> {\n    return this._dtsLibReferenceDirectives;\n  }\n\n  public get entities(): ReadonlyArray<CollectorEntity> {\n    return this._entities;\n  }\n\n  /**\n   * A list of module specifiers (e.g. `\"@rushstack/node-core-library/lib/FileSystem\"`) that should be emitted\n   * as star exports (e.g. `export * from \"@rushstack/node-core-library/lib/FileSystem\"`).\n   */\n  public get starExportedExternalModulePaths(): ReadonlyArray<string> {\n    return this._starExportedExternalModulePaths;\n  }\n\n  /**\n   * Perform the analysis.\n   */\n  public analyze(): void {\n    if (this._astEntryPoint) {\n      throw new Error('DtsRollupGenerator.analyze() was already called');\n    }\n\n    // This runs a full type analysis, and then augments the Abstract Syntax Tree (i.e. declarations)\n    // with semantic information (i.e. symbols).  The \"diagnostics\" are a subset of the everyday\n    // compile errors that would result from a full compilation.\n    for (const diagnostic of this._program.getSemanticDiagnostics()) {\n      this.messageRouter.addCompilerDiagnostic(diagnostic);\n    }\n\n    const sourceFiles: readonly ts.SourceFile[] = this.program.getSourceFiles();\n\n    if (this.messageRouter.showDiagnostics) {\n      this.messageRouter.logDiagnosticHeader('Root filenames');\n      for (const fileName of this.program.getRootFileNames()) {\n        this.messageRouter.logDiagnostic(fileName);\n      }\n      this.messageRouter.logDiagnosticFooter();\n\n      this.messageRouter.logDiagnosticHeader('Files analyzed by compiler');\n      for (const sourceFile of sourceFiles) {\n        this.messageRouter.logDiagnostic(sourceFile.fileName);\n      }\n      this.messageRouter.logDiagnosticFooter();\n    }\n\n    // We can throw this error earlier in CompilerState.ts, but intentionally wait until after we've logged the\n    // associated diagnostic message above to make debugging easier for developers.\n    // Typically there will be many such files -- to avoid too much noise, only report the first one.\n    const badSourceFile: ts.SourceFile | undefined = sourceFiles.find(\n      ({ fileName }) => !ExtractorConfig.hasDtsFileExtension(fileName)\n    );\n    if (badSourceFile) {\n      this.messageRouter.addAnalyzerIssueForPosition(\n        ExtractorMessageId.WrongInputFileType,\n        'Incorrect file type; API Extractor expects to analyze compiler outputs with the .d.ts file extension. ' +\n          'Troubleshooting tips: https://api-extractor.com/link/dts-error',\n        badSourceFile,\n        0\n      );\n    }\n\n    // Build the entry point\n    const entryPointSourceFile: ts.SourceFile = this.workingPackage.entryPointSourceFile;\n\n    const astEntryPoint: AstModule =\n      this.astSymbolTable.fetchAstModuleFromWorkingPackage(entryPointSourceFile);\n    this._astEntryPoint = astEntryPoint;\n\n    const packageDocCommentTextRange: ts.TextRange | undefined = PackageDocComment.tryFindInSourceFile(\n      entryPointSourceFile,\n      this\n    );\n\n    if (packageDocCommentTextRange) {\n      const range: tsdoc.TextRange = tsdoc.TextRange.fromStringRange(\n        entryPointSourceFile.text,\n        packageDocCommentTextRange.pos,\n        packageDocCommentTextRange.end\n      );\n\n      this.workingPackage.tsdocParserContext = this._tsdocParser.parseRange(range);\n\n      this.messageRouter.addTsdocMessages(this.workingPackage.tsdocParserContext, entryPointSourceFile);\n\n      this.workingPackage.tsdocComment = this.workingPackage.tsdocParserContext!.docComment;\n    }\n\n    const { exportedLocalEntities, starExportedExternalModules, visitedAstModules }: IAstModuleExportInfo =\n      this.astSymbolTable.fetchAstModuleExportInfo(astEntryPoint);\n\n    // Create a CollectorEntity for each top-level export.\n    const processedAstEntities: AstEntity[] = [];\n    for (const [exportName, astEntity] of exportedLocalEntities) {\n      this._createCollectorEntity(astEntity, exportName);\n      processedAstEntities.push(astEntity);\n    }\n\n    // Recursively create the remaining CollectorEntities after the top-level entities\n    // have been processed.\n    const alreadySeenAstEntities: Set<AstEntity> = new Set<AstEntity>();\n    for (const astEntity of processedAstEntities) {\n      this._recursivelyCreateEntities(astEntity, alreadySeenAstEntities);\n      if (astEntity instanceof AstSymbol) {\n        this.fetchSymbolMetadata(astEntity);\n      }\n    }\n\n    // Ensure references are collected from any intermediate files that\n    // only include exports\n    const nonExternalSourceFiles: Set<ts.SourceFile> = new Set();\n    for (const { sourceFile, isExternal } of visitedAstModules) {\n      if (!nonExternalSourceFiles.has(sourceFile) && !isExternal) {\n        nonExternalSourceFiles.add(sourceFile);\n      }\n    }\n\n    // Here, we're collecting reference directives from all non-external source files\n    // that were encountered while looking for exports, but only those references that\n    // were explicitly written by the developer and marked with the `preserve=\"true\"`\n    // attribute. In TS >= 5.5, only references that are explicitly authored and marked\n    // with `preserve=\"true\"` are included in the output. See https://github.com/microsoft/TypeScript/pull/57681\n    //\n    // The `_collectReferenceDirectives` function pulls in all references in files that\n    // contain definitions, but does not examine files that only reexport from other\n    // files. Here, we're looking through files that were missed by `_collectReferenceDirectives`,\n    // but only collecting references that were explicitly marked with `preserve=\"true\"`.\n    // It is intuitive for developers to include references that they explicitly want part of\n    // their public API in a file like the entrypoint, which is likely to only contain reexports,\n    // and this picks those up.\n    this._collectReferenceDirectivesFromSourceFiles(nonExternalSourceFiles, true);\n\n    this._makeUniqueNames();\n\n    for (const starExportedExternalModule of starExportedExternalModules) {\n      if (starExportedExternalModule.externalModulePath !== undefined) {\n        this._starExportedExternalModulePaths.push(starExportedExternalModule.externalModulePath);\n      }\n    }\n\n    Sort.sortBy(this._entities, (x) => x.getSortKey());\n    Sort.sortSet(this._dtsTypeReferenceDirectives);\n    Sort.sortSet(this._dtsLibReferenceDirectives);\n    this._starExportedExternalModulePaths.sort();\n  }\n\n  /**\n   * For a given ts.Identifier that is part of an AstSymbol that we analyzed, return the CollectorEntity that\n   * it refers to.  Returns undefined if it doesn't refer to anything interesting.\n   * @remarks\n   * Throws an Error if the ts.Identifier is not part of node tree that was analyzed.\n   */\n  public tryGetEntityForNode(identifier: ts.Identifier | ts.ImportTypeNode): CollectorEntity | undefined {\n    const astEntity: AstEntity | undefined = this.astSymbolTable.tryGetEntityForNode(identifier);\n    if (astEntity) {\n      return this._entitiesByAstEntity.get(astEntity);\n    }\n    return undefined;\n  }\n\n  /**\n   * For a given analyzed ts.Symbol, return the CollectorEntity that it refers to. Returns undefined if it\n   * doesn't refer to anything interesting.\n   */\n  public tryGetEntityForSymbol(symbol: ts.Symbol): CollectorEntity | undefined {\n    return this._entitiesBySymbol.get(symbol);\n  }\n\n  /**\n   * Returns the associated `CollectorEntity` for the given `astEntity`, if one was created during analysis.\n   */\n  public tryGetCollectorEntity(astEntity: AstEntity): CollectorEntity | undefined {\n    return this._entitiesByAstEntity.get(astEntity);\n  }\n\n  public fetchSymbolMetadata(astSymbol: AstSymbol): SymbolMetadata {\n    if (astSymbol.symbolMetadata === undefined) {\n      this._fetchSymbolMetadata(astSymbol);\n    }\n    return astSymbol.symbolMetadata as SymbolMetadata;\n  }\n\n  public fetchDeclarationMetadata(astDeclaration: AstDeclaration): DeclarationMetadata {\n    if (astDeclaration.declarationMetadata === undefined) {\n      // Fetching the SymbolMetadata always constructs the DeclarationMetadata\n      this._fetchSymbolMetadata(astDeclaration.astSymbol);\n    }\n    return astDeclaration.declarationMetadata as DeclarationMetadata;\n  }\n\n  public fetchApiItemMetadata(astDeclaration: AstDeclaration): ApiItemMetadata {\n    if (astDeclaration.apiItemMetadata === undefined) {\n      // Fetching the SymbolMetadata always constructs the ApiItemMetadata\n      this._fetchSymbolMetadata(astDeclaration.astSymbol);\n    }\n    return astDeclaration.apiItemMetadata as ApiItemMetadata;\n  }\n\n  public tryFetchMetadataForAstEntity(astEntity: AstEntity): SymbolMetadata | undefined {\n    if (astEntity instanceof AstSymbol) {\n      return this.fetchSymbolMetadata(astEntity);\n    }\n    if (astEntity instanceof AstImport) {\n      if (astEntity.astSymbol) {\n        return this.fetchSymbolMetadata(astEntity.astSymbol);\n      }\n    }\n    return undefined;\n  }\n\n  public isAncillaryDeclaration(astDeclaration: AstDeclaration): boolean {\n    const declarationMetadata: DeclarationMetadata = this.fetchDeclarationMetadata(astDeclaration);\n    return declarationMetadata.isAncillary;\n  }\n\n  public getNonAncillaryDeclarations(astSymbol: AstSymbol): ReadonlyArray<AstDeclaration> {\n    const result: AstDeclaration[] = [];\n    for (const astDeclaration of astSymbol.astDeclarations) {\n      const declarationMetadata: DeclarationMetadata = this.fetchDeclarationMetadata(astDeclaration);\n      if (!declarationMetadata.isAncillary) {\n        result.push(astDeclaration);\n      }\n    }\n    return result;\n  }\n\n  /**\n   * Removes the leading underscore, for example: \"_Example\" --> \"example*Example*_\"\n   *\n   * @remarks\n   * This causes internal definitions to sort alphabetically case-insensitive, then case-sensitive, and\n   * initially ignoring the underscore prefix, while still deterministically comparing it.\n   * The star is used as a delimiter because it is not a legal  identifier character.\n   */\n  public static getSortKeyIgnoringUnderscore(identifier: string | undefined): string {\n    if (!identifier) return '';\n\n    let parts: string[];\n\n    if (identifier[0] === '_') {\n      const withoutUnderscore: string = identifier.substr(1);\n      parts = [withoutUnderscore.toLowerCase(), '*', withoutUnderscore, '*', '_'];\n    } else {\n      parts = [identifier.toLowerCase(), '*', identifier];\n    }\n\n    return parts.join('');\n  }\n\n  /**\n   * For function-like signatures, this returns the TSDoc \"overload index\" which can be used to identify\n   * a specific overload.\n   */\n  public getOverloadIndex(astDeclaration: AstDeclaration): number {\n    const allDeclarations: ReadonlyArray<AstDeclaration> = astDeclaration.astSymbol.astDeclarations;\n    if (allDeclarations.length === 1) {\n      return 1; // trivial case\n    }\n\n    let overloadIndex: number | undefined = this._cachedOverloadIndexesByDeclaration.get(astDeclaration);\n\n    if (overloadIndex === undefined) {\n      // TSDoc index selectors are positive integers counting from 1\n      let nextIndex: number = 1;\n      for (const other of allDeclarations) {\n        // Filter out other declarations that are not overloads.  For example, an overloaded function can also\n        // be a namespace.\n        if (other.declaration.kind === astDeclaration.declaration.kind) {\n          this._cachedOverloadIndexesByDeclaration.set(other, nextIndex);\n          ++nextIndex;\n        }\n      }\n      overloadIndex = this._cachedOverloadIndexesByDeclaration.get(astDeclaration);\n    }\n\n    if (overloadIndex === undefined) {\n      // This should never happen\n      throw new InternalError('Error calculating overload index for declaration');\n    }\n\n    return overloadIndex;\n  }\n\n  private _createCollectorEntity(\n    astEntity: AstEntity,\n    exportName?: string,\n    parent?: CollectorEntity\n  ): CollectorEntity {\n    let entity: CollectorEntity | undefined = this._entitiesByAstEntity.get(astEntity);\n\n    if (!entity) {\n      entity = new CollectorEntity(astEntity);\n\n      this._entitiesByAstEntity.set(astEntity, entity);\n      if (astEntity instanceof AstSymbol) {\n        this._entitiesBySymbol.set(astEntity.followedSymbol, entity);\n      } else if (astEntity instanceof AstNamespaceImport) {\n        this._entitiesBySymbol.set(astEntity.symbol, entity);\n      }\n      this._entities.push(entity);\n      this._collectReferenceDirectives(astEntity);\n    }\n\n    if (exportName) {\n      if (parent) {\n        entity.addLocalExportName(exportName, parent);\n      } else {\n        entity.addExportName(exportName);\n      }\n    }\n\n    return entity;\n  }\n\n  private _recursivelyCreateEntities(astEntity: AstEntity, alreadySeenAstEntities: Set<AstEntity>): void {\n    if (alreadySeenAstEntities.has(astEntity)) return;\n    alreadySeenAstEntities.add(astEntity);\n\n    if (astEntity instanceof AstSymbol) {\n      astEntity.forEachDeclarationRecursive((astDeclaration: AstDeclaration) => {\n        for (const referencedAstEntity of astDeclaration.referencedAstEntities) {\n          if (referencedAstEntity instanceof AstSymbol) {\n            // We only create collector entities for root-level symbols. For example, if a symbol is\n            // nested inside a namespace, only the namespace gets a collector entity. Note that this\n            // is not true for AstNamespaceImports below.\n            if (referencedAstEntity.parentAstSymbol === undefined) {\n              this._createCollectorEntity(referencedAstEntity);\n            }\n          } else {\n            this._createCollectorEntity(referencedAstEntity);\n          }\n\n          this._recursivelyCreateEntities(referencedAstEntity, alreadySeenAstEntities);\n        }\n      });\n    }\n\n    if (astEntity instanceof AstNamespaceImport) {\n      const astModuleExportInfo: IAstModuleExportInfo = astEntity.fetchAstModuleExportInfo(this);\n      const parentEntity: CollectorEntity | undefined = this._entitiesByAstEntity.get(astEntity);\n      if (!parentEntity) {\n        // This should never happen, as we've already created entities for all AstNamespaceImports.\n        throw new InternalError(\n          `Failed to get CollectorEntity for AstNamespaceImport with namespace name \"${astEntity.namespaceName}\"`\n        );\n      }\n\n      for (const [localExportName, localAstEntity] of astModuleExportInfo.exportedLocalEntities) {\n        // Create a CollectorEntity for each local export within an AstNamespaceImport entity.\n        this._createCollectorEntity(localAstEntity, localExportName, parentEntity);\n        this._recursivelyCreateEntities(localAstEntity, alreadySeenAstEntities);\n      }\n    }\n  }\n\n  /**\n   * Ensures a unique name for each item in the package typings file.\n   */\n  private _makeUniqueNames(): void {\n    // The following examples illustrate the nameForEmit heuristics:\n    //\n    // Example 1:\n    //   class X { } <--- nameForEmit should be \"A\" to simplify things and reduce possibility of conflicts\n    //   export { X as A };\n    //\n    // Example 2:\n    //   class X { } <--- nameForEmit should be \"X\" because choosing A or B would be nondeterministic\n    //   export { X as A };\n    //   export { X as B };\n    //\n    // Example 3:\n    //   class X { } <--- nameForEmit should be \"X_1\" because Y has a stronger claim to the name\n    //   export { X as A };\n    //   export { X as B };\n    //   class Y { } <--- nameForEmit should be \"X\"\n    //   export { Y as X };\n\n    // Set of names that should NOT be used when generating a unique nameForEmit\n    const usedNames: Set<string> = new Set<string>();\n\n    // First collect the names of explicit package exports, and perform a sanity check.\n    for (const entity of this._entities) {\n      for (const exportName of entity.exportNames) {\n        if (usedNames.has(exportName)) {\n          // This should be impossible\n          throw new InternalError(`A package cannot have two exports with the name \"${exportName}\"`);\n        }\n        usedNames.add(exportName);\n      }\n    }\n\n    // Ensure that each entity has a unique nameForEmit\n    for (const entity of this._entities) {\n      // What name would we ideally want to emit it as?\n      let idealNameForEmit: string;\n\n      // If this entity is exported exactly once, then we prefer the exported name\n      if (\n        entity.singleExportName !== undefined &&\n        entity.singleExportName !== ts.InternalSymbolName.Default\n      ) {\n        idealNameForEmit = entity.singleExportName;\n      } else {\n        // otherwise use the local name\n        idealNameForEmit = entity.astEntity.localName;\n      }\n\n      if (idealNameForEmit.includes('.')) {\n        // For an ImportType with a namespace chain, only the top namespace is imported.\n        idealNameForEmit = idealNameForEmit.split('.')[0];\n      }\n\n      // If the idealNameForEmit happens to be the same as one of the exports, then we're safe to use that...\n      if (entity.exportNames.has(idealNameForEmit)) {\n        // ...except that if it conflicts with a global name, then the global name wins\n        if (!this.globalVariableAnalyzer.hasGlobalName(idealNameForEmit)) {\n          // ...also avoid \"default\" which can interfere with \"export { default } from 'some-module;'\"\n          if (idealNameForEmit !== 'default') {\n            entity.nameForEmit = idealNameForEmit;\n            continue;\n          }\n        }\n      }\n\n      // Generate a unique name based on idealNameForEmit\n      let suffix: number = 1;\n      let nameForEmit: string = idealNameForEmit;\n\n      // Choose a name that doesn't conflict with usedNames or a global name\n      while (\n        nameForEmit === 'default' ||\n        usedNames.has(nameForEmit) ||\n        this.globalVariableAnalyzer.hasGlobalName(nameForEmit)\n      ) {\n        nameForEmit = `${idealNameForEmit}_${++suffix}`;\n      }\n      entity.nameForEmit = nameForEmit;\n      usedNames.add(nameForEmit);\n    }\n  }\n\n  private _fetchSymbolMetadata(astSymbol: AstSymbol): void {\n    if (astSymbol.symbolMetadata) {\n      return;\n    }\n\n    // When we solve an astSymbol, then we always also solve all of its parents and all of its declarations.\n    // The parent is solved first.\n    if (astSymbol.parentAstSymbol && astSymbol.parentAstSymbol.symbolMetadata === undefined) {\n      this._fetchSymbolMetadata(astSymbol.parentAstSymbol);\n    }\n\n    // Construct the DeclarationMetadata objects, and detect any ancillary declarations\n    this._calculateDeclarationMetadataForDeclarations(astSymbol);\n\n    // Calculate the ApiItemMetadata objects\n    for (const astDeclaration of astSymbol.astDeclarations) {\n      this._calculateApiItemMetadata(astDeclaration);\n    }\n\n    // The most public effectiveReleaseTag for all declarations\n    let maxEffectiveReleaseTag: ReleaseTag = ReleaseTag.None;\n\n    for (const astDeclaration of astSymbol.astDeclarations) {\n      // We know we solved this above\n      const apiItemMetadata: ApiItemMetadata = astDeclaration.apiItemMetadata as ApiItemMetadata;\n\n      const effectiveReleaseTag: ReleaseTag = apiItemMetadata.effectiveReleaseTag;\n\n      if (effectiveReleaseTag > maxEffectiveReleaseTag) {\n        maxEffectiveReleaseTag = effectiveReleaseTag;\n      }\n    }\n\n    // Update this last when we're sure no exceptions were thrown\n    astSymbol.symbolMetadata = new SymbolMetadata({\n      maxEffectiveReleaseTag\n    });\n  }\n\n  private _calculateDeclarationMetadataForDeclarations(astSymbol: AstSymbol): void {\n    // Initialize DeclarationMetadata for each declaration\n    for (const astDeclaration of astSymbol.astDeclarations) {\n      if (astDeclaration.declarationMetadata) {\n        throw new InternalError(\n          'AstDeclaration.declarationMetadata is not expected to have been initialized yet'\n        );\n      }\n\n      const metadata: InternalDeclarationMetadata = new InternalDeclarationMetadata();\n      metadata.tsdocParserContext = this._parseTsdocForAstDeclaration(astDeclaration);\n\n      astDeclaration.declarationMetadata = metadata;\n    }\n\n    // Detect ancillary declarations\n    for (const astDeclaration of astSymbol.astDeclarations) {\n      // For a getter/setter pair, make the setter ancillary to the getter\n      if (astDeclaration.declaration.kind === ts.SyntaxKind.SetAccessor) {\n        let foundGetter: boolean = false;\n        for (const getterAstDeclaration of astDeclaration.astSymbol.astDeclarations) {\n          if (getterAstDeclaration.declaration.kind === ts.SyntaxKind.GetAccessor) {\n            // Associate it with the getter\n            this._addAncillaryDeclaration(getterAstDeclaration, astDeclaration);\n\n            foundGetter = true;\n          }\n        }\n\n        if (!foundGetter) {\n          this.messageRouter.addAnalyzerIssue(\n            ExtractorMessageId.MissingGetter,\n            `The property \"${astDeclaration.astSymbol.localName}\" has a setter but no getter.`,\n            astDeclaration\n          );\n        }\n      }\n    }\n  }\n\n  private _addAncillaryDeclaration(\n    mainAstDeclaration: AstDeclaration,\n    ancillaryAstDeclaration: AstDeclaration\n  ): void {\n    const mainMetadata: InternalDeclarationMetadata =\n      mainAstDeclaration.declarationMetadata as InternalDeclarationMetadata;\n    const ancillaryMetadata: InternalDeclarationMetadata =\n      ancillaryAstDeclaration.declarationMetadata as InternalDeclarationMetadata;\n\n    if (mainMetadata.ancillaryDeclarations.indexOf(ancillaryAstDeclaration) >= 0) {\n      return; // already added\n    }\n\n    if (mainAstDeclaration.astSymbol !== ancillaryAstDeclaration.astSymbol) {\n      throw new InternalError(\n        'Invalid call to _addAncillaryDeclaration() because declarations do not' +\n          ' belong to the same symbol'\n      );\n    }\n\n    if (mainMetadata.isAncillary) {\n      throw new InternalError(\n        'Invalid call to _addAncillaryDeclaration() because the target is ancillary itself'\n      );\n    }\n\n    if (ancillaryMetadata.isAncillary) {\n      throw new InternalError(\n        'Invalid call to _addAncillaryDeclaration() because source is already ancillary' +\n          ' to another declaration'\n      );\n    }\n\n    if (mainAstDeclaration.apiItemMetadata || ancillaryAstDeclaration.apiItemMetadata) {\n      throw new InternalError(\n        'Invalid call to _addAncillaryDeclaration() because the API item metadata' +\n          ' has already been constructed'\n      );\n    }\n\n    ancillaryMetadata.isAncillary = true;\n    mainMetadata.ancillaryDeclarations.push(ancillaryAstDeclaration);\n  }\n\n  private _calculateApiItemMetadata(astDeclaration: AstDeclaration): void {\n    const declarationMetadata: InternalDeclarationMetadata =\n      astDeclaration.declarationMetadata as InternalDeclarationMetadata;\n    if (declarationMetadata.isAncillary) {\n      if (astDeclaration.declaration.kind === ts.SyntaxKind.SetAccessor) {\n        if (declarationMetadata.tsdocParserContext) {\n          this.messageRouter.addAnalyzerIssue(\n            ExtractorMessageId.SetterWithDocs,\n            `The doc comment for the property \"${astDeclaration.astSymbol.localName}\"` +\n              ` must appear on the getter, not the setter.`,\n            astDeclaration\n          );\n        }\n      }\n\n      // We never calculate ApiItemMetadata for an ancillary declaration; instead, it is assigned when\n      // the main declaration is processed.\n      return;\n    }\n\n    const options: IApiItemMetadataOptions = {\n      declaredReleaseTag: ReleaseTag.None,\n      effectiveReleaseTag: ReleaseTag.None,\n      isEventProperty: false,\n      isOverride: false,\n      isSealed: false,\n      isVirtual: false,\n      isPreapproved: false,\n      releaseTagSameAsParent: false\n    };\n\n    const parserContext: tsdoc.ParserContext | undefined = declarationMetadata.tsdocParserContext;\n    if (parserContext) {\n      const modifierTagSet: tsdoc.StandardModifierTagSet = parserContext.docComment.modifierTagSet;\n\n      let declaredReleaseTag: ReleaseTag = ReleaseTag.None;\n      let extraReleaseTags: boolean = false;\n\n      if (modifierTagSet.isPublic()) {\n        declaredReleaseTag = ReleaseTag.Public;\n      }\n      if (modifierTagSet.isBeta()) {\n        if (declaredReleaseTag !== ReleaseTag.None) {\n          extraReleaseTags = true;\n        } else {\n          declaredReleaseTag = ReleaseTag.Beta;\n        }\n      }\n      if (modifierTagSet.isAlpha()) {\n        if (declaredReleaseTag !== ReleaseTag.None) {\n          extraReleaseTags = true;\n        } else {\n          declaredReleaseTag = ReleaseTag.Alpha;\n        }\n      }\n      if (modifierTagSet.isInternal()) {\n        if (declaredReleaseTag !== ReleaseTag.None) {\n          extraReleaseTags = true;\n        } else {\n          declaredReleaseTag = ReleaseTag.Internal;\n        }\n      }\n\n      if (extraReleaseTags) {\n        if (!astDeclaration.astSymbol.isExternal) {\n          // for now, don't report errors for external code\n          this.messageRouter.addAnalyzerIssue(\n            ExtractorMessageId.ExtraReleaseTag,\n            'The doc comment should not contain more than one release tag',\n            astDeclaration\n          );\n        }\n      }\n\n      options.declaredReleaseTag = declaredReleaseTag;\n\n      options.isEventProperty = modifierTagSet.isEventProperty();\n      options.isOverride = modifierTagSet.isOverride();\n      options.isSealed = modifierTagSet.isSealed();\n      options.isVirtual = modifierTagSet.isVirtual();\n      const preapprovedTag: tsdoc.TSDocTagDefinition | void =\n        this.extractorConfig.tsdocConfiguration.tryGetTagDefinition('@preapproved');\n\n      if (preapprovedTag && modifierTagSet.hasTag(preapprovedTag)) {\n        // This feature only makes sense for potentially big declarations.\n        switch (astDeclaration.declaration.kind) {\n          case ts.SyntaxKind.ClassDeclaration:\n          case ts.SyntaxKind.EnumDeclaration:\n          case ts.SyntaxKind.InterfaceDeclaration:\n          case ts.SyntaxKind.ModuleDeclaration:\n            if (declaredReleaseTag === ReleaseTag.Internal) {\n              options.isPreapproved = true;\n            } else {\n              this.messageRouter.addAnalyzerIssue(\n                ExtractorMessageId.PreapprovedBadReleaseTag,\n                `The @preapproved tag cannot be applied to \"${astDeclaration.astSymbol.localName}\"` +\n                  ` without an @internal release tag`,\n                astDeclaration\n              );\n            }\n            break;\n          default:\n            this.messageRouter.addAnalyzerIssue(\n              ExtractorMessageId.PreapprovedUnsupportedType,\n              `The @preapproved tag cannot be applied to \"${astDeclaration.astSymbol.localName}\"` +\n                ` because it is not a supported declaration type`,\n              astDeclaration\n            );\n            break;\n        }\n      }\n    }\n\n    // This needs to be set regardless of whether or not a parserContext exists\n    if (astDeclaration.parent) {\n      const parentApiItemMetadata: ApiItemMetadata = this.fetchApiItemMetadata(astDeclaration.parent);\n      options.effectiveReleaseTag =\n        options.declaredReleaseTag === ReleaseTag.None\n          ? parentApiItemMetadata.effectiveReleaseTag\n          : options.declaredReleaseTag;\n\n      options.releaseTagSameAsParent =\n        parentApiItemMetadata.effectiveReleaseTag === options.effectiveReleaseTag;\n    } else {\n      options.effectiveReleaseTag = options.declaredReleaseTag;\n    }\n\n    if (options.effectiveReleaseTag === ReleaseTag.None) {\n      if (!astDeclaration.astSymbol.isExternal) {\n        // for now, don't report errors for external code\n        // Don't report missing release tags for forgotten exports (unless we're including forgotten exports\n        // in either the API report or doc model).\n        const astSymbol: AstSymbol = astDeclaration.astSymbol;\n        const entity: CollectorEntity | undefined = this._entitiesByAstEntity.get(astSymbol.rootAstSymbol);\n        if (\n          entity &&\n          (entity.consumable ||\n            this.extractorConfig.apiReportIncludeForgottenExports ||\n            this.extractorConfig.docModelIncludeForgottenExports)\n        ) {\n          // We also don't report errors for the default export of an entry point, since its doc comment\n          // isn't easy to obtain from the .d.ts file\n          if (astSymbol.rootAstSymbol.localName !== '_default') {\n            this.messageRouter.addAnalyzerIssue(\n              ExtractorMessageId.MissingReleaseTag,\n              `\"${entity.astEntity.localName}\" is part of the package's API, but it is missing ` +\n                `a release tag (@alpha, @beta, @public, or @internal)`,\n              astSymbol\n            );\n          }\n        }\n      }\n\n      options.effectiveReleaseTag = ReleaseTag.Public;\n    }\n\n    const apiItemMetadata: ApiItemMetadata = new ApiItemMetadata(options);\n    if (parserContext) {\n      apiItemMetadata.tsdocComment = parserContext.docComment;\n    }\n\n    astDeclaration.apiItemMetadata = apiItemMetadata;\n\n    // Lastly, share the result with any ancillary declarations\n    for (const ancillaryDeclaration of declarationMetadata.ancillaryDeclarations) {\n      ancillaryDeclaration.apiItemMetadata = apiItemMetadata;\n    }\n  }\n\n  private _parseTsdocForAstDeclaration(astDeclaration: AstDeclaration): tsdoc.ParserContext | undefined {\n    const declaration: ts.Declaration = astDeclaration.declaration;\n    let nodeForComment: ts.Node = declaration;\n\n    if (ts.isVariableDeclaration(declaration)) {\n      // Variable declarations are special because they can be combined into a list.  For example:\n      //\n      // /** A */ export /** B */ const /** C */ x = 1, /** D **/ [ /** E */ y, z] = [3, 4];\n      //\n      // The compiler will only emit comments A and C in the .d.ts file, so in general there isn't a well-defined\n      // way to document these parts.  API Extractor requires you to break them into separate exports like this:\n      //\n      // /** A */ export const x = 1;\n      //\n      // But _getReleaseTagForDeclaration() still receives a node corresponding to \"x\", so we need to walk upwards\n      // and find the containing statement in order for getJSDocCommentRanges() to read the comment that we expect.\n      const statement: ts.VariableStatement | undefined = TypeScriptHelpers.findFirstParent(\n        declaration,\n        ts.SyntaxKind.VariableStatement\n      ) as ts.VariableStatement | undefined;\n      if (statement !== undefined) {\n        // For a compound declaration, fall back to looking for C instead of A\n        if (statement.declarationList.declarations.length === 1) {\n          nodeForComment = statement;\n        }\n      }\n    }\n\n    const sourceFileText: string = declaration.getSourceFile().text;\n    const ranges: ts.CommentRange[] =\n      TypeScriptInternals.getJSDocCommentRanges(nodeForComment, sourceFileText) || [];\n\n    if (ranges.length === 0) {\n      return undefined;\n    }\n\n    // We use the JSDoc comment block that is closest to the definition, i.e.\n    // the last one preceding it\n    const range: ts.TextRange = ranges[ranges.length - 1];\n\n    const tsdocTextRange: tsdoc.TextRange = tsdoc.TextRange.fromStringRange(\n      sourceFileText,\n      range.pos,\n      range.end\n    );\n\n    const parserContext: tsdoc.ParserContext = this._tsdocParser.parseRange(tsdocTextRange);\n\n    this.messageRouter.addTsdocMessages(parserContext, declaration.getSourceFile(), astDeclaration);\n\n    // We delete the @privateRemarks block as early as possible, to ensure that it never leaks through\n    // into one of the output files.\n    parserContext.docComment.privateRemarks = undefined;\n\n    return parserContext;\n  }\n\n  private _collectReferenceDirectives(astEntity: AstEntity): void {\n    // Here, we're collecting reference directives from source files that contain extracted\n    // definitions (i.e. - files that contain `export class ...`, `export interface ...`, ...).\n    // These references may or may not include the `preserve=\"true\" attribute. In TS < 5.5,\n    // references that end up in .D.TS files may or may not be explicity written by the developer.\n    // In TS >= 5.5, only references that are explicitly authored and are marked with\n    // `preserve=\"true\"` are included in the output. See https://github.com/microsoft/TypeScript/pull/57681\n    //\n    // The calls to `_collectReferenceDirectivesFromSourceFiles` in this function are\n    // preserving existing behavior, which is to include all reference directives\n    // regardless of whether they are explicitly authored or not, but only in files that\n    // contain definitions.\n\n    if (astEntity instanceof AstSymbol) {\n      const sourceFiles: ts.SourceFile[] = astEntity.astDeclarations.map((astDeclaration) =>\n        astDeclaration.declaration.getSourceFile()\n      );\n      return this._collectReferenceDirectivesFromSourceFiles(sourceFiles, false);\n    }\n\n    if (astEntity instanceof AstNamespaceImport) {\n      const sourceFiles: ts.SourceFile[] = [astEntity.astModule.sourceFile];\n      return this._collectReferenceDirectivesFromSourceFiles(sourceFiles, false);\n    }\n  }\n\n  private _collectReferenceDirectivesFromSourceFiles(\n    sourceFiles: Iterable<ts.SourceFile>,\n    onlyIncludeExplicitlyPreserved: boolean\n  ): void {\n    const seenFilenames: Set<string> = new Set<string>();\n\n    for (const sourceFile of sourceFiles) {\n      if (sourceFile?.fileName) {\n        const {\n          fileName,\n          typeReferenceDirectives,\n          libReferenceDirectives,\n          text: sourceFileText\n        } = sourceFile;\n        if (!seenFilenames.has(fileName)) {\n          seenFilenames.add(fileName);\n\n          for (const typeReferenceDirective of typeReferenceDirectives) {\n            const name: string | undefined = this._getReferenceDirectiveFromSourceFile(\n              sourceFileText,\n              typeReferenceDirective,\n              onlyIncludeExplicitlyPreserved\n            );\n            if (name) {\n              this._dtsTypeReferenceDirectives.add(name);\n            }\n          }\n\n          for (const libReferenceDirective of libReferenceDirectives) {\n            const reference: string | undefined = this._getReferenceDirectiveFromSourceFile(\n              sourceFileText,\n              libReferenceDirective,\n              onlyIncludeExplicitlyPreserved\n            );\n            if (reference) {\n              this._dtsLibReferenceDirectives.add(reference);\n            }\n          }\n        }\n      }\n    }\n  }\n\n  private _getReferenceDirectiveFromSourceFile(\n    sourceFileText: string,\n    { pos, end, preserve }: ts.FileReference,\n    onlyIncludeExplicitlyPreserved: boolean\n  ): string | undefined {\n    const reference: string = sourceFileText.substring(pos, end);\n    if (preserve || !onlyIncludeExplicitlyPreserved) {\n      return reference;\n    }\n  }\n}\n"]}