/**
 * Check if an IndexedDB database exists. The only way to do so is to try opening it, so
 * we do that and then delete it did not exist before.
 *
 * @param indexedDB - The `indexedDB` interface
 * @param dbName - The database name to test for
 * @returns Whether the database exists
 */
export declare function exists(indexedDB: IDBFactory, dbName: string): Promise<boolean>;
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