@newdash/newdash/async/LazyPromise.js

javascript/typescript utility library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.LazyPromise = void 0;
/**
 * @internal
 */
const GlobalPromise = Promise;
/**
 * LazyPromise, execute async operation when user await it.
 *
 * @author Theo Sun
 *
 * @category Async
 * @since 5.18.0
 */
class LazyPromise {
    _executor;
    _promise;
    /**
     * LazyPromise, execute async operation when user await it.
     *
     * @param executor Promise executor
     */
    constructor(executor) {
        this._executor = executor;
    }
    [Symbol.toStringTag];
    _getPromise() {
        if (this._promise === undefined) {
            this._promise = new GlobalPromise(this._executor);
        }
        return this._promise;
    }
    then(onfulfilled, onrejected) {
        return this._getPromise().then(onfulfilled, onrejected);
    }
    catch(onrejected) {
        return this._getPromise().catch(onrejected);
    }
    finally(onfinally) {
        return this._getPromise().finally(onfinally);
    }
}
exports.LazyPromise = LazyPromise;