Promise subclass which uses AbortController to provide a cancel() method.

CancellablePromise.js

export class CancellablePromise extends Promise {
  #abortController;

  constructor(callback) {
    const abortController = new AbortController();
    super((resolve, reject) => {
      callback(resolve, reject);
      abortController.signal.addEventListener('abort', reject);
    });
    this.#abortController = abortController;
  }

  get abortSignal() {
    return this.#abortController.signal;
  }

  cancel() {
    this.#abortController.abort();
  }
}