/**
 * Internal class that allows us to track the state of a promise (chain).
 */
export declare class State<T = any> {
    static MakeState<TState = any>(promise: Promise<TState> | null, rejected?: unknown, fulfilled?: TState): State<TState>;
    protected constructor();
    protected _promise: Promise<T> | null;
    get promise(): Promise<T> | null;
    protected _pending: boolean;
    get pending(): boolean;
    protected _fulfilled: T;
    get fulfilled(): T;
    protected _rejected: unknown;
    get rejected(): unknown;
}