import type { SessionFormatChain, SessionFormatChainOptions, SessionFormatMigration } from './types.ts';
/**
 * Validate and freeze one adjacent migration declaration.
 * @param migration - named exact adjacent conversion.
 * @returns immutable validated declaration.
 */
export declare function defineSessionFormatMigration(migration: SessionFormatMigration): SessionFormatMigration;
/**
 * Compile a unique, complete adjacent migration chain.
 * @param options - current version, adjacent declarations, and current restorer.
 * @returns immutable planner and streaming migration compiler.
 */
export declare function createSessionFormatChain(options: SessionFormatChainOptions): SessionFormatChain;
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