{"version":3,"sources":["../../src/Interceptor.ts","../../src/createRequestId.ts","../../src/utils/canParseUrl.ts","../../src/utils/getValueBySymbol.ts","../../src/utils/fetchUtils.ts"],"sourcesContent":["import { Logger } from '@open-draft/logger'\nimport { Emitter, Listener } from 'strict-event-emitter'\n\nexport type InterceptorEventMap = Record<string, any>\nexport type InterceptorSubscription = () => void\n\n/**\n * Request header name to detect when a single request\n * is being handled by nested interceptors (XHR -> ClientRequest).\n * Obscure by design to prevent collisions with user-defined headers.\n * Ideally, come up with the Interceptor-level mechanism for this.\n * @see https://github.com/mswjs/interceptors/issues/378\n */\nexport const INTERNAL_REQUEST_ID_HEADER_NAME =\n  'x-interceptors-internal-request-id'\n\nexport function getGlobalSymbol<V>(symbol: Symbol): V | undefined {\n  return (\n    // @ts-ignore https://github.com/Microsoft/TypeScript/issues/24587\n    globalThis[symbol] || undefined\n  )\n}\n\nfunction setGlobalSymbol(symbol: Symbol, value: any): void {\n  // @ts-ignore\n  globalThis[symbol] = value\n}\n\nexport function deleteGlobalSymbol(symbol: Symbol): void {\n  // @ts-ignore\n  delete globalThis[symbol]\n}\n\nexport enum InterceptorReadyState {\n  INACTIVE = 'INACTIVE',\n  APPLYING = 'APPLYING',\n  APPLIED = 'APPLIED',\n  DISPOSING = 'DISPOSING',\n  DISPOSED = 'DISPOSED',\n}\n\nexport type ExtractEventNames<Events extends Record<string, any>> =\n  Events extends Record<infer EventName, any> ? EventName : never\n\nexport class Interceptor<Events extends InterceptorEventMap> {\n  protected emitter: Emitter<Events>\n  protected subscriptions: Array<InterceptorSubscription>\n  protected logger: Logger\n\n  public readyState: InterceptorReadyState\n\n  constructor(private readonly symbol: symbol) {\n    this.readyState = InterceptorReadyState.INACTIVE\n\n    this.emitter = new Emitter()\n    this.subscriptions = []\n    this.logger = new Logger(symbol.description!)\n\n    // Do not limit the maximum number of listeners\n    // so not to limit the maximum amount of parallel events emitted.\n    this.emitter.setMaxListeners(0)\n\n    this.logger.info('constructing the interceptor...')\n  }\n\n  /**\n   * Determine if this interceptor can be applied\n   * in the current environment.\n   */\n  protected checkEnvironment(): boolean {\n    return true\n  }\n\n  /**\n   * Apply this interceptor to the current process.\n   * Returns an already running interceptor instance if it's present.\n   */\n  public apply(): void {\n    const logger = this.logger.extend('apply')\n    logger.info('applying the interceptor...')\n\n    if (this.readyState === InterceptorReadyState.APPLIED) {\n      logger.info('intercepted already applied!')\n      return\n    }\n\n    const shouldApply = this.checkEnvironment()\n\n    if (!shouldApply) {\n      logger.info('the interceptor cannot be applied in this environment!')\n      return\n    }\n\n    this.readyState = InterceptorReadyState.APPLYING\n\n    // Whenever applying a new interceptor, check if it hasn't been applied already.\n    // This enables to apply the same interceptor multiple times, for example from a different\n    // interceptor, only proxying events but keeping the stubs in a single place.\n    const runningInstance = this.getInstance()\n\n    if (runningInstance) {\n      logger.info('found a running instance, reusing...')\n\n      // Proxy any listeners you set on this instance to the running instance.\n      this.on = (event, listener) => {\n        logger.info('proxying the \"%s\" listener', event)\n\n        // Add listeners to the running instance so they appear\n        // at the top of the event listeners list and are executed first.\n        runningInstance.emitter.addListener(event, listener)\n\n        // Ensure that once this interceptor instance is disposed,\n        // it removes all listeners it has appended to the running interceptor instance.\n        this.subscriptions.push(() => {\n          runningInstance.emitter.removeListener(event, listener)\n          logger.info('removed proxied \"%s\" listener!', event)\n        })\n\n        return this\n      }\n\n      this.readyState = InterceptorReadyState.APPLIED\n\n      return\n    }\n\n    logger.info('no running instance found, setting up a new instance...')\n\n    // Setup the interceptor.\n    this.setup()\n\n    // Store the newly applied interceptor instance globally.\n    this.setInstance()\n\n    this.readyState = InterceptorReadyState.APPLIED\n  }\n\n  /**\n   * Setup the module augments and stubs necessary for this interceptor.\n   * This method is not run if there's a running interceptor instance\n   * to prevent instantiating an interceptor multiple times.\n   */\n  protected setup(): void {}\n\n  /**\n   * Listen to the interceptor's public events.\n   */\n  public on<EventName extends ExtractEventNames<Events>>(\n    event: EventName,\n    listener: Listener<Events[EventName]>\n  ): this {\n    const logger = this.logger.extend('on')\n\n    if (\n      this.readyState === InterceptorReadyState.DISPOSING ||\n      this.readyState === InterceptorReadyState.DISPOSED\n    ) {\n      logger.info('cannot listen to events, already disposed!')\n      return this\n    }\n\n    logger.info('adding \"%s\" event listener:', event, listener)\n\n    this.emitter.on(event, listener)\n    return this\n  }\n\n  public once<EventName extends ExtractEventNames<Events>>(\n    event: EventName,\n    listener: Listener<Events[EventName]>\n  ): this {\n    this.emitter.once(event, listener)\n    return this\n  }\n\n  public off<EventName extends ExtractEventNames<Events>>(\n    event: EventName,\n    listener: Listener<Events[EventName]>\n  ): this {\n    this.emitter.off(event, listener)\n    return this\n  }\n\n  public removeAllListeners<EventName extends ExtractEventNames<Events>>(\n    event?: EventName\n  ): this {\n    this.emitter.removeAllListeners(event)\n    return this\n  }\n\n  /**\n   * Disposes of any side-effects this interceptor has introduced.\n   */\n  public dispose(): void {\n    const logger = this.logger.extend('dispose')\n\n    if (this.readyState === InterceptorReadyState.DISPOSED) {\n      logger.info('cannot dispose, already disposed!')\n      return\n    }\n\n    logger.info('disposing the interceptor...')\n    this.readyState = InterceptorReadyState.DISPOSING\n\n    if (!this.getInstance()) {\n      logger.info('no interceptors running, skipping dispose...')\n      return\n    }\n\n    // Delete the global symbol as soon as possible,\n    // indicating that the interceptor is no longer running.\n    this.clearInstance()\n\n    logger.info('global symbol deleted:', getGlobalSymbol(this.symbol))\n\n    if (this.subscriptions.length > 0) {\n      logger.info('disposing of %d subscriptions...', this.subscriptions.length)\n\n      for (const dispose of this.subscriptions) {\n        dispose()\n      }\n\n      this.subscriptions = []\n\n      logger.info('disposed of all subscriptions!', this.subscriptions.length)\n    }\n\n    this.emitter.removeAllListeners()\n    logger.info('destroyed the listener!')\n\n    this.readyState = InterceptorReadyState.DISPOSED\n  }\n\n  private getInstance(): this | undefined {\n    const instance = getGlobalSymbol<this>(this.symbol)\n    this.logger.info('retrieved global instance:', instance?.constructor?.name)\n    return instance\n  }\n\n  private setInstance(): void {\n    setGlobalSymbol(this.symbol, this)\n    this.logger.info('set global instance!', this.symbol.description)\n  }\n\n  private clearInstance(): void {\n    deleteGlobalSymbol(this.symbol)\n    this.logger.info('cleared global instance!', this.symbol.description)\n  }\n}\n","/**\n * Generate a random ID string to represent a request.\n * @example\n * createRequestId()\n * // \"f774b6c9c600f\"\n */\nexport function createRequestId(): string {\n  return Math.random().toString(16).slice(2)\n}\n","/**\n * Returns a boolean indicating whether the given URL string\n * can be parsed into a `URL` instance.\n * A substitute for `URL.canParse()` for Node.js 18.\n */\nexport function canParseUrl(url: string): boolean {\n  try {\n    new URL(url)\n    return true\n  } catch (_error) {\n    return false\n  }\n}\n","/**\n * Returns the value behind the symbol with the given name.\n */\nexport function getValueBySymbol<T>(\n  symbolName: string,\n  source: object\n): T | undefined {\n  const ownSymbols = Object.getOwnPropertySymbols(source)\n\n  const symbol = ownSymbols.find((symbol) => {\n    return symbol.description === symbolName\n  })\n\n  if (symbol) {\n    return Reflect.get(source, symbol)\n  }\n\n  return\n}\n","import { canParseUrl } from './canParseUrl'\nimport { getValueBySymbol } from './getValueBySymbol'\n\nexport interface FetchResponseInit extends ResponseInit {\n  url?: string\n}\n\ninterface UndiciFetchInternalState {\n  aborted: boolean\n  rangeRequested: boolean\n  timingAllowPassed: boolean\n  requestIncludesCredentials: boolean\n  type: ResponseType\n  status: number\n  statusText: string\n  timingInfo: unknown\n  cacheState: unknown\n  headersList: Record<symbol, Map<string, unknown>>\n  urlList: Array<URL>\n  body?: {\n    stream: ReadableStream\n    source: unknown\n    length: number\n  }\n}\n\nexport class FetchResponse extends Response {\n  /**\n   * Response status codes for responses that cannot have body.\n   * @see https://fetch.spec.whatwg.org/#statuses\n   */\n  static readonly STATUS_CODES_WITHOUT_BODY = [101, 103, 204, 205, 304]\n\n  static readonly STATUS_CODES_WITH_REDIRECT = [301, 302, 303, 307, 308]\n\n  static isConfigurableStatusCode(status: number): boolean {\n    return status >= 200 && status <= 599\n  }\n\n  static isRedirectResponse(status: number): boolean {\n    return FetchResponse.STATUS_CODES_WITH_REDIRECT.includes(status)\n  }\n\n  /**\n   * Returns a boolean indicating whether the given response status\n   * code represents a response that can have a body.\n   */\n  static isResponseWithBody(status: number): boolean {\n    return !FetchResponse.STATUS_CODES_WITHOUT_BODY.includes(status)\n  }\n\n  static setUrl(url: string | undefined, response: Response): void {\n    if (!url || url === 'about:' || !canParseUrl(url)) {\n      return\n    }\n\n    const state = getValueBySymbol<UndiciFetchInternalState>('state', response)\n\n    if (state) {\n      // In Undici, push the URL to the internal list of URLs.\n      // This will respect the `response.url` getter logic correctly.\n      state.urlList.push(new URL(url))\n    } else {\n      // In other libraries, redefine the `url` property directly.\n      Object.defineProperty(response, 'url', {\n        value: url,\n        enumerable: true,\n        configurable: true,\n        writable: false,\n      })\n    }\n  }\n\n  /**\n   * Parses the given raw HTTP headers into a Fetch API `Headers` instance.\n   */\n  static parseRawHeaders(rawHeaders: Array<string>): Headers {\n    const headers = new Headers()\n    for (let line = 0; line < rawHeaders.length; line += 2) {\n      headers.append(rawHeaders[line], rawHeaders[line + 1])\n    }\n    return headers\n  }\n\n  constructor(body?: BodyInit | null, init: FetchResponseInit = {}) {\n    const status = init.status ?? 200\n    const safeStatus = FetchResponse.isConfigurableStatusCode(status)\n      ? status\n      : 200\n    const finalBody = FetchResponse.isResponseWithBody(status) ? body : null\n\n    super(finalBody, {\n      ...init,\n      status: safeStatus,\n    })\n\n    if (status !== safeStatus) {\n      /**\n       * @note Undici keeps an internal \"Symbol(state)\" that holds\n       * the actual value of response status. Update that in Node.js.\n       */\n      const state = getValueBySymbol<UndiciFetchInternalState>('state', this)\n\n      if (state) {\n        state.status = status\n      } else {\n        Object.defineProperty(this, 'status', {\n          value: status,\n          enumerable: true,\n          configurable: true,\n          writable: false,\n        })\n      }\n    }\n\n    FetchResponse.setUrl(init.url, this)\n  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