import { PackageJson } from 'type-fest';
/**
 * We have not tried to compute this specific value yet.
 */
export type Unknown = {
    state: 'not-attempted';
};
/**
 * We have already tried to compute this specific value but failed. There is no reason to try it again.
 */
export type Failed = {
    state: 'attempt-has-failed';
};
/**
 * We have already tried to compute this specific value and succeeded.
 */
export type Cached<T> = {
    state: 'value-has-been-cached';
    value: T;
};
export type CachedValue<T> = Unknown | Failed | Cached<T>;
export declare const unknown: Unknown;
export declare function readPackageJson(): Promise<PackageJson | null>;
export declare function _resetOnlyForTesting(): void;
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