import { CanonicalTranscriptionObject, LegacyTranscriptionObject, Transcription, TranscriptionObject } from '../types/nodes.js';
export declare function isCanonicalTranscriptionObject(t: TranscriptionObject): t is CanonicalTranscriptionObject;
export declare function isLegacyTranscriptionObject(t: TranscriptionObject): t is LegacyTranscriptionObject;
export declare function isValidTranscription(t: unknown): t is Transcription;
/**
 * Collapse any {@link Transcription} to canonical form.
 *
 * Bare strings pass through unchanged. Legacy objects are rewritten as
 * `{ schemes, primary }` where the legacy `primary` value is hoisted into
 * `schemes` under a synthetic `primary` key (preserving round-trip read
 * compatibility — see ADR-0001).
 *
 * @throws if `t` is structurally invalid or if a canonical input has `primary`
 *   pointing at a key not in `schemes`.
 */
export declare function normalizeTranscription(t: Transcription): string | CanonicalTranscriptionObject;
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