export type HashOrigin = 'sri' | 'berry-zip' | 'url-fragment' | 'registry' | 'recomputed';
export interface Hash {
    readonly algorithm: string;
    readonly digest: string;
    readonly origin: HashOrigin;
}
export interface Integrity {
    readonly hashes: readonly Hash[];
}
export declare function emptyIntegrity(): Integrity;
export declare function isEmptyIntegrity(i: Integrity): boolean;
export declare function isTarballOrigin(origin: HashOrigin): boolean;
export declare function tarballHashes(i: Integrity): Hash[];
export declare function tarballSha1ForUrlFragment(i: Integrity): string | undefined;
export declare function pickAlgorithm(i: Integrity, algorithm: string): Hash | undefined;
export declare function pickTarballSha512(i: Integrity): Hash | undefined;
export declare function parseSri(raw: string, origin?: HashOrigin): Integrity;
export declare function emitSri(i: Integrity): string | undefined;
export declare function emitSriForRegistry(i: Integrity | undefined, resolvedUrl: string | undefined): string | undefined;
export declare function parseBerryChecksum(raw: string): {
    integrity: Integrity;
    cacheKey?: string;
};
export declare function emitBerryChecksum(i: Integrity): string | undefined;
export declare function mergeIntegrity(a: Integrity, b: Integrity): Integrity;
export declare function canonicalDigest(i: Integrity): string | undefined;
export declare function integrityEquivalent(a: Integrity, b: Integrity): boolean;