threads/dist-esm/promise.js

Web workers & worker threads as simple as a function call

const doNothing = () => undefined;
/**
 * Creates a new promise and exposes its resolver function.
 * Use with care!
 */
export function createPromiseWithResolver() {
    let alreadyResolved = false;
    let resolvedTo;
    let resolver = doNothing;
    const promise = new Promise(resolve => {
        if (alreadyResolved) {
            resolve(resolvedTo);
        }
        else {
            resolver = resolve;
        }
    });
    const exposedResolver = (value) => {
        alreadyResolved = true;
        resolvedTo = value;
        resolver(resolvedTo);
    };
    return [promise, exposedResolver];
}