export declare class InvalidateSync {
    private invalidated;
    private invalidatedDouble;
    private stopped;
    private command;
    private pendings;
    constructor(command: () => Promise<void>);
    invalidate(): void;
    invalidateAndAwait(): Promise<void>;
    awaitQueue(): Promise<void>;
    stop(): void;
    private notifyPendings;
    private doSync;
}
export declare class ValueSync<T> {
    private latestValue;
    private hasValue;
    private processing;
    private stopped;
    private command;
    private pendings;
    constructor(command: (value: T) => Promise<void>);
    setValue(value: T): void;
    setValueAndAwait(value: T): Promise<void>;
    awaitQueue(): Promise<void>;
    stop(): void;
    private notifyPendings;
    private doSync;
}
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