/**
 * Canonical JSON, the one encoder behind every hashed value in Arc. Keys sort
 * by UTF-16 code unit and scalars encode as `JSON.stringify` writes them. Only
 * plain data encodes: non-finite numbers, `bigint`, functions, symbols,
 * `undefined`, missing array items, non-plain objects and cycles throw.
 */
export declare function canonicalJson(value: unknown): string;
/**
 * The UDL document layout: canonical JSON with a two-space indent. Every
 * stored `documentDigest` hashes these bytes.
 */
export declare function writeJson(value: unknown): string;
/** SHA-256 over canonical JSON, encoded as lowercase hexadecimal. */
export declare function digest(value: unknown): string;
export declare function sha256(text: string): string;
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