module@warp-drive/experiments/image-fetch @experimental

Class ImageFetch

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:34

Main-thread client for an ImageWorker. Sends image load requests to a Worker or SharedWorker running an ImageWorker.

In FastBoot/SSR, or when constructed with a null worker, ImageFetch skips worker communication entirely: ImageFetch.load resolves immediately with the given url.

A plain Worker is only accepted when running in a TESTING build; production usage requires a SharedWorker.

Constructors

Constructor

new ImageFetch(worker: 
  | Worker
  | SharedWorker
  | null): ImageFetch;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:46

Parameters

worker

| Worker | SharedWorker | null

the Worker or SharedWorker running an ImageWorker, or null to disable worker communication (e.g. in FastBoot/SSR).

Returns

ImageFetch

Methods

_send()

_send(event: RequestEventData): void;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:95

Parameters

event

RequestEventData

Returns

void

---

cleanupRequest()

cleanupRequest(url: string): Deferred<string> | undefined;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:88

Parameters

url

string

Returns

Deferred<string> | undefined

---

load()

load(url: string): Promise<string>;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:118

Requests that the given image url be loaded by the connected ImageWorker, resolving with an object url for the fetched image's blob once the worker responds (or immediately with the original url, in SSR/FastBoot or when this instance was constructed with a null worker).

The resolved object url is cached in-memory by source url on this instance, so subsequent calls for the same url resolve immediately without another round-trip to the worker.

Calling load again for a url that is already in-flight (not yet cached) on this instance replaces the pending request rather than joining it — only the most recently issued call for a given url will resolve.

Parameters

url

string

Returns

Promise<string>

Properties

cache

cache: Map<string, string>;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:39

---

channel

channel: MessageChannel;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:38

---

pending

pending: Map<string, Deferred<string>>;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:37

---

threadId

threadId: string;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:36

---

worker

worker: 
  | Worker
  | SharedWorker;

Defined in: warp-drive-packages/experiments/src/image-worker/fetch.ts:35