dom-observe/src/DeferredPromise.ts

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export class DeferredPromise<TResolve, TReject>{

    public readonly promise: Promise<TResolve>;

    public readonly resolve: {
        (arg?: TResolve): any;
    }

    public readonly reject: {
        (arg?: TReject): any;
    }

    public data?: any;

    private _is_resolved: boolean = false;
    public get isResolved(): boolean{ return this._is_resolved; }

    private _is_rejected: boolean = false;
    public get isRejected(): boolean{ return this._is_rejected; }

    public get isFinished(): boolean{ return this._is_resolved || this._is_rejected; }

    /**
     * @constructor
     */
    constructor(){
        let res: any, rej: any;

        this.promise = new Promise<TResolve>((resolve, reject) => {
            res = resolve;
            rej = reject;
        });

        this.resolve = (...args) => {
            this._is_resolved = true;
            return res(...args);
        };

        this.reject = (...args) => {
            this._is_rejected = true;
            return rej(...args);
        };
    }

}