/**
 * Opens an IndexedDB database with the specified name and version.
 * A blocked request stays pending until native success or error. The caller
 * owns the returned connection and must close it when no longer needed.
 *
 * @param name - The name of the database to open
 * @param version - The version number of the database schema
 * @param onUpgrade - Optional callback that runs during the onupgradeneeded event.
 *                    Use this to create object stores and indexes.
 * @param idbFactory - Optional IDBFactory for testing/mocking (defaults to window.indexedDB or globalThis.indexedDB)
 * @param onBlocked - Optional diagnostic callback for native blocked events. The request stays pending.
 * @returns A promise that resolves to the IDBDatabase instance
 *
 * @example
 * ```typescript
 * const db = await openDatabase('myApp', 1, (db, oldVersion, newVersion, transaction) => {
 *   if (oldVersion < 1) {
 *     db.createObjectStore('todos', { keyPath: 'id' })
 *   }
 * })
 * ```
 */
export declare function openDatabase(name: string, version: number, onUpgrade?: (db: IDBDatabase, oldVersion: number, newVersion: number, transaction: IDBTransaction) => void, idbFactory?: IDBFactory, onBlocked?: (event: IDBVersionChangeEvent) => void): Promise<IDBDatabase>;
/**
 * Creates an object store during a database upgrade.
 *
 * This function must be called within an onupgradeneeded callback
 * (i.e., within a versionchange transaction). Calling it outside of
 * an upgrade context will throw an error.
 *
 * @param db - The IDBDatabase instance
 * @param storeName - The name of the object store to create
 * @param options - Optional configuration for the object store (keyPath, autoIncrement)
 * @returns The created IDBObjectStore
 * @throws Error if not called during a version change transaction
 *
 * @example
 * ```typescript
 * const db = await openDatabase('myApp', 1, (db) => {
 *   createObjectStore(db, 'todos', { keyPath: 'id' })
 *   createObjectStore(db, 'users', { keyPath: 'id', autoIncrement: true })
 * })
 * ```
 */
export declare function createObjectStore(db: IDBDatabase, storeName: string, options?: IDBObjectStoreParameters): IDBObjectStore;
/**
 * Executes a callback within an IndexedDB transaction.
 *
 * This function handles transaction lifecycle automatically:
 * - Creates the transaction with the specified mode
 * - Provides the transaction and object stores to the callback
 * - Waits for both the callback and the transaction to complete (or abort)
 * - Returns the callback's result or rejects with an error
 *
 * IndexedDB can commit while an async callback is still pending. If that callback
 * later rejects, this function rejects but cannot undo the committed writes.
 *
 * @template T - The return type of the callback
 * @param db - The IDBDatabase instance
 * @param storeNames - A single store name or array of store names to include in the transaction
 * @param mode - The transaction mode ('readonly', 'readwrite', or 'readwriteflush')
 * @param callback - A function that performs operations within the transaction.
 *                   Receives the transaction and a record of object stores keyed by name.
 *                   Can be sync or async.
 * @returns A promise that resolves to the callback's return value when the transaction completes
 *
 * @example
 * ```typescript
 * // Single store
 * const result = await executeTransaction(db, 'todos', 'readwrite', (tx, stores) => {
 *   stores.todos.put({ id: 1, text: 'Buy milk' })
 *   return 'done'
 * })
 *
 * // Multiple stores
 * await executeTransaction(db, ['todos', 'users'], 'readwrite', (tx, stores) => {
 *   stores.todos.put({ id: 1, text: 'Task' })
 *   stores.users.put({ id: 1, name: 'Alice' })
 * })
 * ```
 */
export declare function executeTransaction<T>(db: IDBDatabase, storeNames: string | Array<string>, mode: IDBTransactionMode, callback: (transaction: IDBTransaction, stores: Record<string, IDBObjectStore>) => T | Promise<T>): Promise<T>;
/**
 * Retrieves all items from an object store.
 *
 * Uses the native `getAll()` method for efficient bulk retrieval.
 *
 * @template T - The type of items in the object store
 * @param objectStore - The IDBObjectStore to read from
 * @returns A promise that resolves to an array of all items in the store
 *
 * @example
 * ```typescript
 * await executeTransaction(db, 'todos', 'readonly', async (tx, stores) => {
 *   const allTodos = await getAll<Todo>(stores.todos)
 *   console.log('All todos:', allTodos)
 * })
 * ```
 */
export declare function getAll<T>(objectStore: IDBObjectStore): Promise<Array<T>>;
/**
 * Retrieves all keys from an object store.
 *
 * Uses the native `getAllKeys()` method for efficient bulk key retrieval.
 *
 * @param objectStore - The IDBObjectStore to read keys from
 * @returns A promise that resolves to an array of all keys in the store
 *
 * @example
 * ```typescript
 * await executeTransaction(db, 'todos', 'readonly', async (tx, stores) => {
 *   const allKeys = await getAllKeys(stores.todos)
 *   console.log('All keys:', allKeys)
 * })
 * ```
 */
export declare function getAllKeys(objectStore: IDBObjectStore): Promise<Array<IDBValidKey>>;
/**
 * Retrieves a single item by its key from an object store.
 *
 * @template T - The type of the item
 * @param objectStore - The IDBObjectStore to read from
 * @param key - The key of the item to retrieve
 * @returns A promise that resolves to the item, or undefined if not found
 *
 * @example
 * ```typescript
 * await executeTransaction(db, 'todos', 'readonly', async (tx, stores) => {
 *   const todo = await getByKey<Todo>(stores.todos, 1)
 *   if (todo) {
 *     console.log('Found todo:', todo)
 *   }
 * })
 * ```
 */
export declare function getByKey<T>(objectStore: IDBObjectStore, key: IDBValidKey): Promise<T | undefined>;
/**
 * Writes an item to an object store using upsert semantics.
 *
 * If an item with the same key exists, it will be replaced.
 * If no item with the key exists, a new one will be created.
 *
 * @template T - The type of the item
 * @param objectStore - The IDBObjectStore to write to
 * @param value - The item to write
 * @param key - Optional key for the item. Required if the object store doesn't have a keyPath.
 * @returns A promise that resolves to the key of the written item
 *
 * @example
 * ```typescript
 * // With keyPath (key extracted from value)
 * await executeTransaction(db, 'todos', 'readwrite', async (tx, stores) => {
 *   const key = await put(stores.todos, { id: 1, text: 'Buy milk' })
 *   console.log('Wrote item with key:', key)
 * })
 *
 * // Without keyPath (explicit key)
 * await executeTransaction(db, 'items', 'readwrite', async (tx, stores) => {
 *   const key = await put(stores.items, { text: 'Some data' }, 'myKey')
 *   console.log('Wrote item with key:', key)
 * })
 * ```
 */
export declare function put<T>(objectStore: IDBObjectStore, value: T, key?: IDBValidKey): Promise<IDBValidKey>;
/**
 * Deletes an item by its key from an object store.
 *
 * @param objectStore - The IDBObjectStore to delete from
 * @param key - The key of the item to delete
 * @returns A promise that resolves when the item is deleted
 *
 * @example
 * ```typescript
 * await executeTransaction(db, 'todos', 'readwrite', async (tx, stores) => {
 *   await deleteByKey(stores.todos, 1)
 *   console.log('Todo deleted')
 * })
 * ```
 */
export declare function deleteByKey(objectStore: IDBObjectStore, key: IDBValidKey): Promise<void>;
/**
 * Removes all items from an object store.
 *
 * @param objectStore - The IDBObjectStore to clear
 * @returns A promise that resolves when all items are removed
 *
 * @example
 * ```typescript
 * await executeTransaction(db, 'todos', 'readwrite', async (tx, stores) => {
 *   await clear(stores.todos)
 *   console.log('All todos cleared')
 * })
 * ```
 */
export declare function clear(objectStore: IDBObjectStore): Promise<void>;
/**
 * Deletes an entire IndexedDB database.
 * A blocked request stays pending until native success or error.
 *
 * Use with caution - this removes the database and all of its object stores and data.
 *
 * @param name - The name of the database to delete
 * @param idbFactory - Optional IDBFactory for testing/mocking
 * @param onBlocked - Optional diagnostic callback for native blocked events. The request stays pending.
 * @returns A promise that resolves when the database is deleted
 *
 * @example
 * ```typescript
 * await deleteDatabase('myApp')
 * console.log('Database deleted')
 * ```
 */
export declare function deleteDatabase(name: string, idbFactory?: IDBFactory, onBlocked?: (event: IDBVersionChangeEvent) => void): Promise<void>;