softkave-js-utils/build/promise/getDeferredPromise.js

JavaScript & Typescript utility functions, types, and classes

import assert from 'assert';
import { isBoolean } from 'lodash-es';
export function getDeferredPromise() {
    let pResolveFn;
    let pRejectFn;
    let isResolved;
    const promise = new Promise((resolve, reject) => {
        pResolveFn = resolve;
        pRejectFn = reject;
    });
    const resolveFn = (value) => {
        if (isBoolean(isResolved)) {
            return;
        }
        isResolved = true;
        assert(pResolveFn);
        pResolveFn(value);
    };
    const rejectFn = (error) => {
        if (isBoolean(isResolved)) {
            return;
        }
        isResolved = false;
        assert(pRejectFn);
        pRejectFn(error);
    };
    const isDone = () => isBoolean(isResolved);
    const isPromiseResolved = () => isResolved !== null && isResolved !== void 0 ? isResolved : false;
    return {
        promise,
        isDone,
        isPromiseResolved,
        resolve: resolveFn,
        reject: rejectFn,
    };
}
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