import once from './once'; import types from './types'; declare class Emitter { on(event: string, listener: types.AnyFn): Emitter; off(event: string, listener: types.AnyFn): Emitter; once(event: string, listener: types.AnyFn): Emitter; emit(event: string, ...args: any[]): Emitter; removeAllListeners(event?: string): Emitter; static mixin(obj: any): any; } export default Emitter;