/**
 * Extract only frozen fields from a metadata object and produce a deterministic
 * JSON string with keys sorted alphabetically.
 *
 * Only FROZEN_FIELDS are included — other frontmatter fields (title, tags, etc.)
 * are intentionally excluded so that non-frozen edits do not affect the SHA.
 */
export declare function canonicalizeFrozenFields(metadata: Record<string, unknown>): string;
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