@daisugi/kintsugi/dist/esm/deferred_promise.js

Kintsugi is a set of utilities to help build a fault tolerant services.

export function deferredPromise() {
    let isPending = true;
    let isRejected = false;
    let isFulfilled = false;
    let resolve;
    let reject;
    const promise = new Promise((privateResolve, privateReject) => {
        resolve = privateResolve;
        reject = privateReject;
    }).then((value) => {
        isFulfilled = true;
        isPending = false;
        return value;
    }, (reason) => {
        isRejected = true;
        isPending = false;
        throw reason;
    });
    return {
        isFulfilled() {
            return isFulfilled;
        },
        isPending() {
            return isPending;
        },
        isRejected() {
            return isRejected;
        },
        resolve,
        reject,
        promise,
    };
}
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