declare enum ResolvableState {
    WAITING = 0,
    PENDING = 1,
    ERROR = 2,
    DONE = 3
}
declare class FetchOnce<T, U extends Array<unknown>> {
    protected fetchMethod?: ((...args: U) => Promise<T>) | undefined;
    protected data: T | undefined;
    protected error: unknown | undefined;
    protected state: ResolvableState;
    protected pendings: [(res: Promise<T> | T) => void, (reason: unknown) => void][];
    constructor(fetchMethod?: ((...args: U) => Promise<T>) | undefined);
    resolve(...args: U): Promise<T>;
    protected isFinished(): boolean;
    protected parsePromise(promise: Promise<T>): void;
}
export declare class Resolvable<T, U extends Array<unknown>> extends FetchOnce<T, U> {
    constructor(fetchMethod: (...args: U) => Promise<T>);
}
export declare class WaitForSync<T> extends FetchOnce<T, never> {
    protected state: ResolvableState;
    constructor();
    setData(data: T): void;
    setError(error: unknown): void;
}
export {};