/**
 * Copies a SQLite database with the online backup API.
 *
 * `copyFileSync` cannot do this job: registry.db runs in WAL mode, so a live
 * database keeps committed rows - and, after a fresh migration, the schema
 * itself - in the -wal sidecar. Copying the main file alone yields a database
 * that opens but is missing everything the WAL still holds.
 *
 * Returns the byte size of the copy.
 */
export declare function backupSqliteDatabase(source: string, destination: string, onStep?: () => void): Promise<number>;
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