Class MockWatchHost

packages/compiler-cli/test/perform_watch_spec.ts:244–296

}

class MockWatchHost {
  nextTimeoutListenerId = 1;
  timeoutListeners: {[id: string]: () => void} = {};
  fileChangeListeners: Array<((event: FileChangeEvent, fileName: string) => void) | null> = [];
  diagnostics: ts.Diagnostic[] = [];
  constructor(public config: ng.ParsedConfiguration) {}

  reportDiagnostics(diags: readonly ts.Diagnostic[]) {
    this.diagnostics.push(...diags);
  }
  readConfiguration() {
    return this.config;
  }
  createCompilerHost(options: ng.CompilerOptions) {
    return ng.createCompilerHost({options});
  }
  createEmitCallback() {
    return undefined;
  }
  onFileChange(
    options: ng.CompilerOptions,
    listener: (event: FileChangeEvent, fileName: string) => void,
    ready: () => void,
  ) {
    const id = this.fileChangeListeners.length;
    this.fileChangeListeners.push(listener);
    ready();
    return {
      close: () => (this.fileChangeListeners[id] = null),
    };
  }
  setTimeout(callback: () => void): any {
    const id = this.nextTimeoutListenerId++;
    this.timeoutListeners[id] = callback;
    return id;
  }
  clearTimeout(timeoutId: any): void {
    delete this.timeoutListeners[timeoutId];
  }
  flushTimeouts() {
    const listeners = this.timeoutListeners;
    this.timeoutListeners = {};
    Object.keys(listeners).forEach((id) => listeners[id]());
  }
  triggerFileChange(event: FileChangeEvent, fileName: string) {
    this.fileChangeListeners.forEach((listener) => {
      if (listener) {
        listener(event, fileName);
      }
    });
    this.flushTimeouts();
  }
}