export declare function stripTrailingSlashes(s: string): string;
export declare function fetchJson(url: string, timeoutMs?: number): Promise<unknown>;
/**
 * SHA-256 over canonicalized UTF-8 bytes:
 *   - normalize line endings to LF
 *   - strip a single trailing newline
 * Matches the rule defined in the AI Evidence Format and Prompt
 * Provenance specifications.
 */
export declare function canonicalSha256(content: string): string;
export declare function pretty(value: unknown): string;
/**
 * SHA-256 over canonical JSON of a parsed value: sorted object keys,
 * no whitespace, UTF-8. This is the **structural** hash convention used
 * across the Kinetic Gain implementation stack (procurement-decision-api,
 * aeo-validator-service, aeo-graph-explorer-rs, hash-attestation-rs).
 *
 * Distinct from `canonicalSha256()` above, which hashes a *text content*
 * string after line-ending normalization (the AI Evidence / Prompt
 * Provenance convention).
 *
 * Identical JSON values produce identical hashes regardless of how the
 * input was originally serialised:
 *   { "foo": 1, "bar": 2 }  and  { "bar": 2, "foo": 1 }  -> same hash.
 */
export declare function canonicalJsonSha256(value: unknown): string;
export declare function errorJson(error: string, details?: Record<string, unknown>): string;