/** JSON with sorted object keys and the keys in `skip` left out, so equal
 *  content gives equal text whatever the object came through. */
export declare function stableStringify(value: unknown, skip?: ReadonlySet<string>): string;
/** djb2 over a string, as 8 hex digits and the length in hex: short enough
 *  to store per record, distinct enough to tell configurations apart. */
export declare function hashString(text: string): string;
/** Two independent 32-bit hashes side by side (djb2 and sdbm) and the
 *  length: for keys that must not confuse two long texts. */
export declare function hashStringWide(text: string): string;
/** {@link hashString} of {@link stableStringify}. */
export declare function stableHash(value: unknown, skip?: ReadonlySet<string>): string;
/**
 * The text of one configuration object as it is now, for telling whether
 * it changed in place since it was resolved: plain `JSON.stringify` (the
 * keys of one object keep their order, so no sorting is needed), which
 * costs about 0.2 ms on a 55 KB book configuration. Undefined when the
 * object cannot be written as JSON (a cycle).
 */
export declare function configFingerprint(config: object): string | undefined;
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