import { DeferredPromise } from "./deferred-promise";
import { State } from "./state";
/**
 * A Promise that can be explicitly resolved or rejected.
 *
 * @type T The type of the {@link CompletablePromise}.
 */
export declare class CompletablePromise<T = any> {
    protected state: State;
    protected deferredPromise: DeferredPromise<T>;
    private readonly promise;
    constructor();
    /**
     * Calls the specified deferredOperation if the {@link CompletablePromise} state is
     * {@link State.Pending}. Then sets the {@link CompletablePromise} state to the
     * specified one.
     *
     * @param newState The new state assigned to the {@link CompletablePromise}.
     * @param deferredOperation The method of the {@link DeferredPromise} that should be called.
     */
    private makeDeferredOperation;
    /**
     * Resolves the Promise with a value or the result of another Promise.
     * This method call will succeed only if the Promise state was {@link State.Pending},
     * and it will irreversibly change the Promise state to {@link State.Fulfilled}.
     *
     * @param value The value or the result of another Promise.
     */
    resolve(value: T | PromiseLike<T>): void;
    /**
     * Rejects the Promise with a provided reason or error.
     * This method call will succeed only if the Promise state was {@link State.Pending},
     * and it will irreversibly change the Promise state to {@link State.Rejected}.
     *
     * @param reason The reason or error.
     */
    reject(reason: any): void;
    /**
     * Attempts to {@link resolve} the Promise with a value or the result of another Promise.
     * If retrieving {@param getValue} result fails, {@link reject} function will be called instead.
     *
     * @param getValue A function that returns the value or the result of another Promise.
     */
    tryResolve(getValue: () => T | PromiseLike<T>): void;
    /**
     * Attaches callbacks for the resolution and/or rejection of the Promise.
     *
     * @param onfulfilled The callback to execute when the Promise is resolved.
     * @param onrejected The callback to execute when the Promise is rejected.
     * @returns A Promise for the completion of which ever callback is executed.
     */
    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;
    /**
     * Attaches a callback for only the rejection of the Promise.
     *
     * @param onrejected The callback to execute when the Promise is rejected.
     * @returns A Promise for the completion of the callback.
     */
    catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
    /**
     * Attaches a callback that is invoked when the Promise is settled (fulfilled or rejected).
     * The resolved value cannot be modified from the callback.
     *
     * @param onfinally The callback to execute when the Promise is settled (fulfilled or rejected).
     * @returns A Promise for the completion of the callback.
     */
    finally(onfinally?: (() => void) | undefined | null): Promise<T>;
    /**
     * Returns the inner Promise instance.
     *
     * @returns The inner Promise instance.
     */
    get(): Promise<T>;
    /**
     * Returns the current Promise state.
     *
     * @returns The current Promise state.
     */
    getState(): State;
    /**
     * Returns true if the Promise state it is {@link State.Pending}.
     *
     * @returns Whether the Promise state it is {@link State.Pending}.
     */
    isPending(): boolean;
    /**
     * Returns true if the Promise state it is {@link State.Fulfilled}.
     *
     * @returns Whether the Promise state it is {@link State.Fulfilled}.
     */
    isFulfilled(): boolean;
    /**
     * Returns true if the Promise state it is {@link State.Rejected}.
     *
     * @returns Whether the Promise state it is {@link State.Rejected}.
     */
    isRejected(): boolean;
    /**
     * Returns true if the Promise state it is either {@link State.Fulfilled}
     * or {@link State.Rejected}.
     *
     * @returns Whether the Promise state it is either {@link State.Fulfilled}
     *          or {@link State.Rejected}.
     */
    isSettled(): boolean;
}