/**
 * Info about value and helper functions to manage it.
 */
export type ValueInfo = {
    key: string;
    sig: string;
    state: 'missing' | 'expired' | 'sig-changed' | 'computing' | 'computed';
    value?: unknown;
    persistent?: boolean;
    prevValue?: unknown;
};
export declare function assignValueInfo(valueInfo: ValueInfo, props: Partial<ValueInfo>): ValueInfo & Partial<ValueInfo>;
export declare function getStaleValue(valueInfo?: ValueInfo | null): unknown;
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