Aborting Fetch

AbortController provides a new way of cancelling fetches that are no longer considered relevant. This can be hooked into fetch via the second RequestInit parameter.

Resource

Easy integration is provided with the RestEndpoint via the signal member:

const abort = new AbortController();
const AbortableArticle = CoolerArticleResource.get.extend({
  signal: abort.signal,
});
// ...somewhere later trigger cancellation
abort.abort();

Endpoint

Additionally similar functionality can easily be added to any endpoint using custom members.

type Params = { id: string };

const UserDetail = new Endpoint(
  function ({ id }: Params) {
    const init: RequestInit = {};
    if (this.signal) {
      init.signal = this.signal;
    }
    return fetch(this.url({ id }), init).then(res => res.json()) as Promise<
      typeof payload
    >;
  },
  {
    url({ id }: Params) { return `/users/${id}` },
    signal: undefined as AbortSignal | undefined,
  },
);

const abort = new AbortController();
const AbortableUserDetail = UserDetail.extend({
  signal: abort.signal,
});
// ...somewhere later trigger cancellation
abort.abort();

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