@exadel/esl
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Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components
49 lines (48 loc) • 1.89 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
import { memoize } from '../../decorators/memoize';
/** Deferred object that represents promise with its resolve/reject methods */
export class Deferred {
constructor() {
this._status = 'pending';
}
/** @returns promise based on {@link Deferred} state*/
get promise() {
if (this._status === 'resolved')
return Promise.resolve(this._value);
if (this._status === 'rejected')
return Promise.reject(this._value);
return new Promise((res, rej) => {
this._callbacks = [res, rej];
});
}
/** Resolves deferred promise */
resolve(arg) {
if (this._status === 'pending') {
this._value = arg;
this._status = 'resolved';
this._callbacks && this._callbacks[0](arg);
}
return this;
}
/** Rejects deferred promise */
reject(arg) {
if (this._status === 'pending') {
this._value = arg;
this._status = 'rejected';
this._callbacks && this._callbacks[1](arg);
}
return this;
}
}
__decorate([
memoize()
], Deferred.prototype, "promise", null);
/** Creates Deferred Object that wraps promise and its resolve and reject callbacks */
export function createDeferred() {
return new Deferred();
}