kulshekhar / ts-jest / 9804725795

import { basename, normalize } from 'path'

import { LogContexts, Logger, LogLevels } from 'bs-logger'

import memoize from 'lodash.memoize'

import type {

  Bundle,

  CompilerOptions,

  CustomTransformerFactory,

  CustomTransformers,

  Diagnostic,

  EmitOutput,

  LanguageService,

  LanguageServiceHost,

  ModuleResolutionCache,

  ModuleResolutionHost,

  ParsedCommandLine,

  Program,

  ResolvedModuleFull,

  ResolvedModuleWithFailedLookupLocations,

  SourceFile,

  TransformerFactory,

  TranspileOutput,

} from 'typescript'

import { LINE_FEED, TS_TSX_REGEX } from '../../constants'

import type {

  StringMap,

  TsCompilerInstance,

  TsJestAstTransformer,

  TsJestCompileOptions,

  TTypeScript,

} from '../../types'

import { CompiledOutput } from '../../types'

import { rootLogger } from '../../utils'

import { Errors, interpolate } from '../../utils/messages'

import type { ConfigSet } from '../config/config-set'

import { updateOutput } from './compiler-utils'

export class TsCompiler implements TsCompilerInstance {

  protected readonly _logger: Logger

  protected readonly _ts: TTypeScript

  protected readonly _initialCompilerOptions: CompilerOptions

  protected _compilerOptions: CompilerOptions

  /**

   * @private

   */

  private _runtimeCacheFS: StringMap

  /**

   * @private

   */

  private _fileContentCache: StringMap | undefined

  /**

   * @internal

   */

  private readonly _parsedTsConfig: ParsedCommandLine

  /**

   * @internal

   */

  private readonly _fileVersionCache: Map<string, number> | undefined

  /**

   * @internal

   */

  private readonly _cachedReadFile: LanguageServiceHost['readFile'] | undefined

  /**

   * @internal

   */

  private _projectVersion = 1

  /**

   * @internal

   */

  private _languageService: LanguageService | undefined

  /**

   * @internal

   */

  private readonly _moduleResolutionHost: ModuleResolutionHost | undefined

  /**

   * @internal

   */

  private readonly _moduleResolutionCache: ModuleResolutionCache | undefined

  program: Program | undefined

  constructor(readonly configSet: ConfigSet, readonly runtimeCacheFS: StringMap) {

    this._ts = configSet.compilerModule

    this._logger = rootLogger.child({ namespace: 'ts-compiler' })

    this._parsedTsConfig = this.configSet.parsedTsConfig as ParsedCommandLine

    this._initialCompilerOptions = { ...this._parsedTsConfig.options }

    this._compilerOptions = { ...this._initialCompilerOptions }

    this._runtimeCacheFS = runtimeCacheFS

    if (!this.configSet.isolatedModules) {

      this._fileContentCache = new Map<string, string>()

      this._fileVersionCache = new Map<string, number>()

      this._cachedReadFile = this._logger.wrap(

        {

          namespace: 'ts:serviceHost',

          call: null,

          [LogContexts.logLevel]: LogLevels.trace,

        },

        'readFile',

        memoize(this._ts.sys.readFile),

      )

      /* istanbul ignore next */

      this._moduleResolutionHost = {

        fileExists: memoize(this._ts.sys.fileExists),

        readFile: this._cachedReadFile,

        directoryExists: memoize(this._ts.sys.directoryExists),

        getCurrentDirectory: () => this.configSet.cwd,

        realpath: this._ts.sys.realpath && memoize(this._ts.sys.realpath),

        getDirectories: memoize(this._ts.sys.getDirectories),

        useCaseSensitiveFileNames: () => this._ts.sys.useCaseSensitiveFileNames,

      }

      this._moduleResolutionCache = this._ts.createModuleResolutionCache(

        this.configSet.cwd,

        this._compilerOptions,

      )

      this._createLanguageService()

    }

  }

  getResolvedModules(fileContent: string, fileName: string, runtimeCacheFS: StringMap): string[] {

    // In watch mode, it is possible that the initial cacheFS becomes empty

    if (!this.runtimeCacheFS.size) {

      this._runtimeCacheFS = runtimeCacheFS

    }

    this._logger.debug({ fileName }, 'getResolvedModules(): resolve direct imported module paths')

    const importedModulePaths: string[] = Array.from(new Set(this._getImportedModulePaths(fileContent, fileName)))

    this._logger.debug(

      { fileName },

      'getResolvedModules(): resolve nested imported module paths from directed imported module paths',

    )

    importedModulePaths.forEach((importedModulePath) => {

      const resolvedFileContent = this._getFileContentFromCache(importedModulePath)

      importedModulePaths.push(

        ...this._getImportedModulePaths(resolvedFileContent, importedModulePath).filter(

          (modulePath) => !importedModulePaths.includes(modulePath),

        ),

      )

    })

    return importedModulePaths

  }

  getCompiledOutput(fileContent: string, fileName: string, options: TsJestCompileOptions): CompiledOutput {

    let moduleKind = this._initialCompilerOptions.module

    let esModuleInterop = this._initialCompilerOptions.esModuleInterop

    let allowSyntheticDefaultImports = this._initialCompilerOptions.allowSyntheticDefaultImports

    const currentModuleKind = this._compilerOptions.module

    const isEsmMode = this.configSet.useESM && options.supportsStaticESM

    if (

      (this.configSet.babelJestTransformer || (!this.configSet.babelJestTransformer && options.supportsStaticESM)) &&

      this.configSet.useESM

    ) {

      moduleKind =

        !moduleKind ||

        (moduleKind &&

          ![this._ts.ModuleKind.ES2015, this._ts.ModuleKind.ES2020, this._ts.ModuleKind.ESNext].includes(moduleKind))

          ? this._ts.ModuleKind.ESNext

      // Make sure `esModuleInterop` and `allowSyntheticDefaultImports` true to support import CJS into ESM

      esModuleInterop = true

      allowSyntheticDefaultImports = true

    } else {

      moduleKind = this._ts.ModuleKind.CommonJS

    }

    this._compilerOptions = {

      ...this._compilerOptions,

      allowSyntheticDefaultImports,

      esModuleInterop,

      module: moduleKind,

    }

    if (this._languageService) {

      this._logger.debug({ fileName }, 'getCompiledOutput(): compiling using language service')

      // Must set memory cache before attempting to compile

      this._updateMemoryCache(fileContent, fileName, currentModuleKind === moduleKind)

      const output: EmitOutput = this._languageService.getEmitOutput(fileName)

      const diagnostics = this.getDiagnostics(fileName)

      if (!isEsmMode && diagnostics.length) {

        this.configSet.raiseDiagnostics(diagnostics, fileName, this._logger)

      }

      if (output.emitSkipped) {

        if (TS_TSX_REGEX.test(fileName)) {

          throw new Error(interpolate(Errors.CannotProcessFile, { file: fileName }))

        } else {

          this._logger.warn(interpolate(Errors.CannotProcessFileReturnOriginal, { file: fileName }))

          return {

            code: fileContent,

          }

        }

      }

      // Throw an error when requiring `.d.ts` files.

      if (!output.outputFiles.length) {

        throw new TypeError(

          interpolate(Errors.UnableToRequireDefinitionFile, {

            file: basename(fileName),

          }),

        )

      }

      const { outputFiles } = output

      return this._compilerOptions.sourceMap

        ? {

            code: updateOutput(outputFiles[1].text, fileName, outputFiles[0].text),

            diagnostics,

          }

    } else {

      this._logger.debug({ fileName }, 'getCompiledOutput(): compiling as isolated module')

      const result: TranspileOutput = this._transpileOutput(fileContent, fileName)

      if (result.diagnostics && this.configSet.shouldReportDiagnostics(fileName)) {

        this.configSet.raiseDiagnostics(result.diagnostics, fileName, this._logger)

      }

      return {

        code: updateOutput(result.outputText, fileName, result.sourceMapText),

      }

    }

  }

  protected _transpileOutput(fileContent: string, fileName: string): TranspileOutput {

    return this._ts.transpileModule(fileContent, {

      fileName,

      transformers: this._makeTransformers(this.configSet.resolvedTransformers),

      compilerOptions: this._compilerOptions,

      reportDiagnostics: this.configSet.shouldReportDiagnostics(fileName),

    })

  }

  protected _makeTransformers(customTransformers: TsJestAstTransformer): CustomTransformers {

    return {

      before: customTransformers.before.map((beforeTransformer) =>

        beforeTransformer.factory(this, beforeTransformer.options),

      ) as Array<TransformerFactory<SourceFile> | CustomTransformerFactory>,

      after: customTransformers.after.map((afterTransformer) =>

        afterTransformer.factory(this, afterTransformer.options),

      ) as Array<TransformerFactory<SourceFile> | CustomTransformerFactory>,

      afterDeclarations: customTransformers.afterDeclarations.map((afterDeclarations) =>

        afterDeclarations.factory(this, afterDeclarations.options),

      ) as Array<TransformerFactory<SourceFile | Bundle>>,

    }

  }

  /**

   * @internal

   */

  private _createLanguageService(): void {

    // Initialize memory cache for typescript compiler

    this._parsedTsConfig.fileNames

      .filter((fileName) => TS_TSX_REGEX.test(fileName) && !this.configSet.isTestFile(fileName))

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      .forEach((fileName) => this._fileVersionCache!.set(fileName, 0))

    /* istanbul ignore next */

    const serviceHost: LanguageServiceHost = {

      useCaseSensitiveFileNames: () => this._ts.sys.useCaseSensitiveFileNames,

      getProjectVersion: () => String(this._projectVersion),

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      getScriptFileNames: () => [...this._fileVersionCache!.keys()],

      getScriptVersion: (fileName: string) => {

        const normalizedFileName = normalize(fileName)

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        const version = this._fileVersionCache!.get(normalizedFileName)

        // We need to return `undefined` and not a string here because TypeScript will use

        // `getScriptVersion` and compare against their own version - which can be `undefined`.

        // If we don't return `undefined` it results in `undefined === "undefined"` and run

        // `createProgram` again (which is very slow). Using a `string` assertion here to avoid

        // TypeScript errors from the function signature (expects `(x: string) => string`).

        // eslint-disable-next-line @typescript-eslint/no-explicit-any

      },

      getScriptSnapshot: (fileName: string) => {

        const normalizedFileName = normalize(fileName)

        const hit = this._isFileInCache(normalizedFileName)

        this._logger.trace({ normalizedFileName, cacheHit: hit }, 'getScriptSnapshot():', 'cache', hit ? 'hit' : 'miss')

        // Read file content from either memory cache or Jest runtime cache or fallback to file system read

        if (!hit) {

          const fileContent =

            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

            this._runtimeCacheFS.get(normalizedFileName) ??

          if (fileContent !== undefined) {

            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

            this._fileContentCache!.set(normalizedFileName, fileContent)

            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

            this._fileVersionCache!.set(normalizedFileName, 1)

          }

        }

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        const contents = this._fileContentCache!.get(normalizedFileName)

        return this._ts.ScriptSnapshot.fromString(contents)

      },

      fileExists: memoize(this._ts.sys.fileExists),

      readDirectory: memoize(this._ts.sys.readDirectory),

      getDirectories: memoize(this._ts.sys.getDirectories),

      directoryExists: memoize(this._ts.sys.directoryExists),

      realpath: this._ts.sys.realpath && memoize(this._ts.sys.realpath),

      getNewLine: () => LINE_FEED,

      getCurrentDirectory: () => this.configSet.cwd,

      getCompilationSettings: () => this._compilerOptions,

      getDefaultLibFileName: () => this._ts.getDefaultLibFilePath(this._compilerOptions),

      getCustomTransformers: () => this._makeTransformers(this.configSet.resolvedTransformers),

      resolveModuleNames: (moduleNames: string[], containingFile: string): Array<ResolvedModuleFull | undefined> =>

        moduleNames.map((moduleName) => this._resolveModuleName(moduleName, containingFile).resolvedModule),

    }

    this._logger.debug('created language service')

    this._languageService = this._ts.createLanguageService(

      serviceHost,

      this._ts.createDocumentRegistry(this._ts.sys.useCaseSensitiveFileNames, this.configSet.cwd),

    )

    this.program = this._languageService.getProgram()

  }

  /**

   * @internal

   */

  private _getFileContentFromCache(filePath: string): string {

    const normalizedFilePath = normalize(filePath)

    let resolvedFileContent = this._runtimeCacheFS.get(normalizedFilePath)

    if (!resolvedFileContent) {

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      resolvedFileContent = this._moduleResolutionHost!.readFile(normalizedFilePath)!

      this._runtimeCacheFS.set(normalizedFilePath, resolvedFileContent)

    }

    return resolvedFileContent

  }

  /**

   * @internal

   */

  private _getImportedModulePaths(resolvedFileContent: string, containingFile: string): string[] {

    return this._ts

      .preProcessFile(resolvedFileContent, true, true)

      .importedFiles.map((importedFile) => {

        const { resolvedModule } = this._resolveModuleName(importedFile.fileName, containingFile)

        /* istanbul ignore next already covered  */

        /* istanbul ignore next already covered  */

      })

      .filter((resolveFileName) => !!resolveFileName)

  }

  /**

   * @internal

   */

  private _resolveModuleName(

    moduleNameToResolve: string,

    containingFile: string,

  ): ResolvedModuleWithFailedLookupLocations {

    return this._ts.resolveModuleName(

      moduleNameToResolve,

      containingFile,

      this._compilerOptions,

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._moduleResolutionHost!,

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._moduleResolutionCache!,

    )

  }

  /**

   * @internal

   */

  private _isFileInCache(fileName: string): boolean {

    return (

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._fileContentCache!.has(fileName) &&

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._fileVersionCache!.has(fileName) &&

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._fileVersionCache!.get(fileName) !== 0

    )

  }

  /**

   * @internal

   */

  private _updateMemoryCache(contents: string, fileName: string, isModuleKindTheSame = true): void {

    this._logger.debug({ fileName }, 'updateMemoryCache: update memory cache for language service')

    let shouldIncrementProjectVersion = false

    const hit = this._isFileInCache(fileName)

    if (!hit) {

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      this._fileVersionCache!.set(fileName, 1)

      shouldIncrementProjectVersion = true

    } else {

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      const prevVersion = this._fileVersionCache!.get(fileName)!

      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

      const previousContents = this._fileContentCache!.get(fileName)

      // Avoid incrementing cache when nothing has changed.

      if (previousContents !== contents) {

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        this._fileVersionCache!.set(fileName, prevVersion + 1)

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        this._fileContentCache!.set(fileName, contents)

        shouldIncrementProjectVersion = true

      }

      /**

       * When a file is from node_modules or referenced to a referenced project and jest wants to transform it, we need

       * to make sure that the Program is updated with this information

       */

      if (!this._parsedTsConfig.fileNames.includes(fileName) || !isModuleKindTheSame) {

        shouldIncrementProjectVersion = true

      }

    }

    if (shouldIncrementProjectVersion) this._projectVersion++

  }

  /**

   * @internal

   */

  private getDiagnostics(fileName: string): Diagnostic[] {

    const diagnostics: Diagnostic[] = []

    if (this.configSet.shouldReportDiagnostics(fileName)) {

      this._logger.debug({ fileName }, '_doTypeChecking(): computing diagnostics using language service')

      // Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.

      diagnostics.push(

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        ...this._languageService!.getSemanticDiagnostics(fileName),

        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion

        ...this._languageService!.getSyntacticDiagnostics(fileName),

      )

    }

    return diagnostics

  }

}