Method fetch

packages/service-worker/worker/testing/mock.ts:148–176

(req: Request)

  }

  async fetch(req: Request): Promise<Response> {
    this.resolveNextRequest?.(req);
    ({promise: this.nextRequest, resolve: this.resolveNextRequest} =
      Promise.withResolvers<Request>());

    await this.gate;

    if (!this.online) {
      throw new Error('Offline.');
    }

    this.requests.push(req);

    if (req.credentials === 'include' || req.mode === 'no-cors') {
      return new MockResponse(null, {status: 0, statusText: '', type: 'opaque'});
    }
    const url = req.url.split('?')[0];
    if (this.resources.has(url)) {
      const response = this.resources.get(url)!.clone();
      if (response.redirected && req.redirect === 'error') {
        throw new Error('Redirect disallowed by request policy.');
      }
      return response;
    }
    if (this.errors.has(url)) {
      throw new Error('Intentional failure!');
    }
    return new MockResponse(null, {status: 404, statusText: 'Not Found'});
  }

  pause(): void {
    ({promise: this.gate, resolve: this.resolve} = Promise.withResolvers<void>());