cancellable-request.ts

export class CancellableRequest {
  private controller = new AbortController();

  public fetch(input: RequestInfo, init: RequestInit = {}): Promise<Response> {
    init.signal = this.controller.signal;

    return fetch(input, init)
      .then(res => res.json());
  }

  public isCancelled(): boolean {
    return this.controller.signal.aborted;
  }

  public cancel(): void {
    this.controller.abort();
  }
}