## API Report File for "@firebase/database"

> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).

```ts

import { FirebaseApp } from '@firebase/app';

// @public (undocumented)
export interface Database {
  // (undocumented)
  app: FirebaseApp;
  // (undocumented)
  goOffline(): void;
  // (undocumented)
  goOnline(): void;
  // (undocumented)
  ref(path?: string | Reference): Reference;
  // (undocumented)
  refFromURL(url: string): Reference;
  // (undocumented)
  useEmulator(host: string, port: number): void;
}

// @public (undocumented)
export interface DataSnapshot {
  // (undocumented)
  child(path: string): DataSnapshot;
  // (undocumented)
  exists(): boolean;
  // (undocumented)
  exportVal(): any;
  // (undocumented)
  forEach(action: (a: DataSnapshot) => boolean | void): boolean;
  // (undocumented)
  getPriority(): string | number | null;
  // (undocumented)
  hasChild(path: string): boolean;
  // (undocumented)
  hasChildren(): boolean;
  // (undocumented)
  key: string | null;
  // (undocumented)
  numChildren(): number;
  // (undocumented)
  ref: Reference;
  // (undocumented)
  toJSON(): object | null;
  // (undocumented)
  val(): any;
}

// @public (undocumented)
export function enableLogging(
  logger?: boolean | ((a: string) => any),
  persistent?: boolean
): any;

// @public (undocumented)
export type EventType =
  | 'value'
  | 'child_added'
  | 'child_changed'
  | 'child_moved'
  | 'child_removed';

// @public (undocumented)
export function getDatabase(app: FirebaseApp, url?: string): Database;

// @public (undocumented)
export interface OnDisconnect {
  // (undocumented)
  cancel(onComplete?: (a: Error | null) => any): Promise<void>;
  // (undocumented)
  remove(onComplete?: (a: Error | null) => any): Promise<void>;
  // (undocumented)
  set(value: any, onComplete?: (a: Error | null) => any): Promise<void>;
  // (undocumented)
  setWithPriority(
    value: any,
    priority: number | string | null,
    onComplete?: (a: Error | null) => any
  ): Promise<any>;
  // (undocumented)
  update(values: object, onComplete?: (a: Error | null) => any): Promise<any>;
}

// @public (undocumented)
export interface Query {
  // (undocumented)
  endAt(value: number | string | boolean | null, key?: string): Query;
  // (undocumented)
  equalTo(value: number | string | boolean | null, key?: string): Query;
  // (undocumented)
  get(): Promise<DataSnapshot>;
  // (undocumented)
  isEqual(other: Query | null): boolean;
  // (undocumented)
  limitToFirst(limit: number): Query;
  // (undocumented)
  limitToLast(limit: number): Query;
  // (undocumented)
  off(
    eventType?: EventType,
    callback?: (a: DataSnapshot, b?: string | null) => any,
    context?: object | null
  ): void;
  // (undocumented)
  on(
    eventType: EventType,
    callback: (a: DataSnapshot, b?: string | null) => any,
    cancelCallbackOrContext?: ((a: Error) => any) | object | null,
    context?: object | null
  ): (a: DataSnapshot, b?: string | null) => any;
  // (undocumented)
  once(
    eventType: EventType,
    successCallback?: (a: DataSnapshot, b?: string | null) => any,
    failureCallbackOrContext?: ((a: Error) => void) | object | null,
    context?: object | null
  ): Promise<DataSnapshot>;
  // (undocumented)
  orderByChild(path: string): Query;
  // (undocumented)
  orderByKey(): Query;
  // (undocumented)
  orderByPriority(): Query;
  // (undocumented)
  orderByValue(): Query;
  // (undocumented)
  ref: Reference;
  // (undocumented)
  startAt(value: number | string | boolean | null, key?: string): Query;
  // (undocumented)
  toJSON(): object;
  // (undocumented)
  toString(): string;
}

// @public (undocumented)
export interface Reference extends Query {
  // (undocumented)
  child(path: string): Reference;
  // (undocumented)
  key: string | null;
  // (undocumented)
  onDisconnect(): OnDisconnect;
  // (undocumented)
  parent: Reference | null;
  // (undocumented)
  push(value?: any, onComplete?: (a: Error | null) => any): ThenableReference;
  // (undocumented)
  remove(onComplete?: (a: Error | null) => any): Promise<any>;
  // (undocumented)
  root: Reference;
  // (undocumented)
  set(value: any, onComplete?: (a: Error | null) => any): Promise<any>;
  // (undocumented)
  setPriority(
    priority: string | number | null,
    onComplete: (a: Error | null) => any
  ): Promise<any>;
  // (undocumented)
  setWithPriority(
    newVal: any,
    newPriority: string | number | null,
    onComplete?: (a: Error | null) => any
  ): Promise<any>;
  // (undocumented)
  transaction(
    transactionUpdate: (a: any) => any,
    onComplete?: (a: Error | null, b: boolean, c: DataSnapshot | null) => any,
    applyLocally?: boolean
  ): Promise<any>;
  // (undocumented)
  update(values: object, onComplete?: (a: Error | null) => any): Promise<any>;
}

// @public (undocumented)
export const ServerValue: {
  TIMESTAMP: object;
  increment(delta: number): object;
};

// @public (undocumented)
export interface ThenableReference
  extends Reference,
    Pick<Promise<Reference>, 'then' | 'catch'> {}


// (No @packageDocumentation comment for this package)

```