/**
 * Layer 0 — canonical serialization and content hashing (design §6.1, PR 1 /
 * task 3.6).
 *
 * Pure logic only: no I/O. In particular this module does NOT import
 * `node:crypto` — the hash algorithm is injected by the caller (plugin
 * layer), keeping this file free of the `io-seam-registry.json` obligation
 * (`antipattern-core-io`).
 */
/** Hash function injected by the caller (e.g. `node:crypto`'s sha256, hex-encoded). */
export type HashFn = (input: string) => string;
/** 256 KB. Content beyond this size only has its prefix hashed (documented limitation). */
export declare const CANONICAL_JSON_MAX_CHARS = 262144;
export declare function canonicalStringify(value: unknown): {
    readonly text: string;
    readonly truncated: boolean;
};
export declare function computeContentHash(value: unknown, hash: HashFn): string;
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