/**
 * Returns the lexicographically-latest ClickHouse migration filename under
 * `dir` (e.g. `"011-issue-brief-citations.sql"`). Matches the file selection
 * `runSqlMigrations` performs at runtime so the synth-time gate value equals
 * the value the runner records in `_schema_migrations.ch_version`.
 *
 * Synchronous I/O — safe at both CDK synth time (the new use site) and inside
 * the migration runner script (the existing applier). Throws when the
 * directory contains no `.sql` files (after stripping `.dev.sql`).
 */
export declare function pickLatestClickHouseMigration(dir: string): string;