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{ resolve } from 'path';\nimport type { CreateOptions } from '.';\nimport type { Extensions } from './file-extensions';\nimport type { TSCommon, TSInternal } from './ts-compiler-types';\nimport type { ProjectLocalResolveHelper } from './util';\n\n/**\n * @internal\n * In a factory because these are shared across both CompilerHost and LanguageService codepaths\n */\nexport function createResolverFunctions(kwargs: {\n ts: TSCommon;\n host: TSCommon.ModuleResolutionHost;\n cwd: string;\n getCanonicalFileName: (filename: string) => string;\n config: TSCommon.ParsedCommandLine;\n projectLocalResolveHelper: ProjectLocalResolveHelper;\n options: CreateOptions;\n extensions: Extensions;\n}) {\n const {\n host,\n ts,\n config,\n cwd,\n getCanonicalFileName,\n projectLocalResolveHelper,\n options,\n extensions,\n } = kwargs;\n const moduleResolutionCache = ts.createModuleResolutionCache(\n cwd,\n getCanonicalFileName,\n config.options\n );\n const knownInternalFilenames = new Set<string>();\n /** \"Buckets\" (module directories) whose contents should be marked \"internal\" */\n const internalBuckets = new Set<string>();\n\n // Get bucket for a source filename. Bucket is the containing `./node_modules/*/` directory\n // For '/project/node_modules/foo/node_modules/bar/lib/index.js' bucket is '/project/node_modules/foo/node_modules/bar/'\n // For '/project/node_modules/foo/node_modules/@scope/bar/lib/index.js' bucket is '/project/node_modules/foo/node_modules/@scope/bar/'\n const moduleBucketRe = /.*\\/node_modules\\/(?:@[^\\/]+\\/)?[^\\/]+\\//;\n function getModuleBucket(filename: string) {\n const find = moduleBucketRe.exec(filename);\n if (find) return find[0];\n return '';\n }\n\n // Mark that this file and all siblings in its bucket should be \"internal\"\n function markBucketOfFilenameInternal(filename: string) {\n internalBuckets.add(getModuleBucket(filename));\n }\n\n function isFileInInternalBucket(filename: string) {\n return internalBuckets.has(getModuleBucket(filename));\n }\n\n function isFileKnownToBeInternal(filename: string) {\n return knownInternalFilenames.has(filename);\n }\n\n /**\n * If we need to emit JS for a file, force TS to consider it non-external\n */\n const fixupResolvedModule = (\n resolvedModule:\n | TSCommon.ResolvedModule\n | TSCommon.ResolvedTypeReferenceDirective\n ) => {\n const { resolvedFileName } = resolvedModule;\n if (resolvedFileName === undefined) return;\n // [MUST_UPDATE_FOR_NEW_FILE_EXTENSIONS]\n // .ts,.mts,.cts is always switched to internal\n // .js is switched on-demand\n if (\n resolvedModule.isExternalLibraryImport &&\n ((resolvedFileName.endsWith('.ts') &&\n !resolvedFileName.endsWith('.d.ts')) ||\n (resolvedFileName.endsWith('.cts') &&\n !resolvedFileName.endsWith('.d.cts')) ||\n (resolvedFileName.endsWith('.mts') &&\n !resolvedFileName.endsWith('.d.mts')) ||\n isFileKnownToBeInternal(resolvedFileName) ||\n isFileInInternalBucket(resolvedFileName))\n ) {\n resolvedModule.isExternalLibraryImport = false;\n }\n if (!resolvedModule.isExternalLibraryImport) {\n knownInternalFilenames.add(resolvedFileName);\n }\n };\n /*\n * NOTE:\n * Older ts versions do not pass `redirectedReference` nor `options`.\n * We must pass `redirectedReference` to newer ts versions, but cannot rely on `options`, hence the weird argument name\n */\n const resolveModuleNames: TSCommon.LanguageServiceHost['resolveModuleNames'] =\n (\n moduleNames: string[],\n containingFile: string,\n reusedNames: string[] | undefined,\n redirectedReference: TSCommon.ResolvedProjectReference | undefined,\n optionsOnlyWithNewerTsVersions: TSCommon.CompilerOptions,\n containingSourceFile?: TSCommon.SourceFile\n ): (TSCommon.ResolvedModule | undefined)[] => {\n return moduleNames.map((moduleName, i) => {\n const mode = containingSourceFile\n ? (ts as any as TSInternal).getModeForResolutionAtIndex?.(\n containingSourceFile,\n i\n )\n : undefined;\n let { resolvedModule } = ts.resolveModuleName(\n moduleName,\n containingFile,\n config.options,\n host,\n moduleResolutionCache,\n redirectedReference,\n mode\n );\n if (!resolvedModule && options.experimentalTsImportSpecifiers) {\n const lastDotIndex = moduleName.lastIndexOf('.');\n const ext = lastDotIndex >= 0 ? moduleName.slice(lastDotIndex) : '';\n if (ext) {\n const replacements = extensions.tsResolverEquivalents.get(ext);\n for (const replacementExt of replacements ?? []) {\n ({ resolvedModule } = ts.resolveModuleName(\n moduleName.slice(0, -ext.length) + replacementExt,\n containingFile,\n config.options,\n host,\n moduleResolutionCache,\n redirectedReference,\n mode\n ));\n if (resolvedModule) break;\n }\n }\n }\n if (resolvedModule) {\n fixupResolvedModule(resolvedModule);\n }\n return resolvedModule;\n });\n };\n\n // language service never calls this, but TS docs recommend that we implement it\n const getResolvedModuleWithFailedLookupLocationsFromCache: TSCommon.LanguageServiceHost['getResolvedModuleWithFailedLookupLocationsFromCache'] =\n (\n moduleName,\n containingFile,\n resolutionMode?: TSCommon.ModuleKind.CommonJS | TSCommon.ModuleKind.ESNext\n ): TSCommon.ResolvedModuleWithFailedLookupLocations | undefined => {\n const ret = ts.resolveModuleNameFromCache(\n moduleName,\n containingFile,\n moduleResolutionCache,\n resolutionMode\n );\n if (ret && ret.resolvedModule) {\n fixupResolvedModule(ret.resolvedModule);\n }\n return ret;\n };\n\n const resolveTypeReferenceDirectives: TSCommon.LanguageServiceHost['resolveTypeReferenceDirectives'] =\n (\n typeDirectiveNames: string[] | readonly TSCommon.FileReference[],\n containingFile: string,\n redirectedReference: TSCommon.ResolvedProjectReference | undefined,\n options: TSCommon.CompilerOptions,\n containingFileMode?: TSCommon.SourceFile['impliedNodeFormat'] | undefined // new impliedNodeFormat is accepted by compilerHost\n ): (TSCommon.ResolvedTypeReferenceDirective | undefined)[] => {\n // Note: seems to be called with empty typeDirectiveNames array for all files.\n // TODO consider using `ts.loadWithTypeDirectiveCache`\n return typeDirectiveNames.map((typeDirectiveName) => {\n // Copy-pasted from TS source:\n const nameIsString = typeof typeDirectiveName === 'string';\n const mode = nameIsString\n ? undefined\n : (ts as any as TSInternal).getModeForFileReference!(\n typeDirectiveName,\n containingFileMode\n );\n const strName = nameIsString\n ? typeDirectiveName\n : typeDirectiveName.fileName.toLowerCase();\n let { resolvedTypeReferenceDirective } =\n ts.resolveTypeReferenceDirective(\n strName,\n containingFile,\n config.options,\n host,\n redirectedReference,\n undefined,\n mode\n );\n if (typeDirectiveName === 'node' && !resolvedTypeReferenceDirective) {\n // Resolve @types/node relative to project first, then __dirname (copy logic from elsewhere / refactor into reusable function)\n let typesNodePackageJsonPath: string | undefined;\n try {\n typesNodePackageJsonPath = projectLocalResolveHelper(\n '@types/node/package.json',\n true\n );\n } catch {} // gracefully do nothing when @types/node is not installed for any reason\n if (typesNodePackageJsonPath) {\n const typeRoots = [resolve(typesNodePackageJsonPath, '../..')];\n ({ resolvedTypeReferenceDirective } =\n ts.resolveTypeReferenceDirective(\n typeDirectiveName,\n containingFile,\n {\n ...config.options,\n typeRoots,\n },\n host,\n redirectedReference\n ));\n }\n }\n if (resolvedTypeReferenceDirective) {\n fixupResolvedModule(resolvedTypeReferenceDirective);\n }\n return resolvedTypeReferenceDirective;\n });\n };\n\n return {\n resolveModuleNames,\n getResolvedModuleWithFailedLookupLocationsFromCache,\n resolveTypeReferenceDirectives,\n isFileKnownToBeInternal,\n markBucketOfFilenameInternal,\n };\n}\n"]}