/// <reference types="node" />
import { EventEmitter } from "events";
import webpack from "webpack";
import { ProgressWatcher } from "./ProgressWatcher";
import { Build as CompilerBuild } from "./Compiler";
export declare enum WatchHandleEvent {
    Build = "build",
    Stop = "stop",
    ProgressStart = "progressStart",
    ProgressComplete = "progressComplete"
}
export declare class WatchHandle extends EventEmitter {
    private readonly webpackCompiler;
    private webpackWatcher;
    private readonly progressWatcher;
    constructor({ webpackCompiler, progressWatcher, }: {
        webpackCompiler: webpack.Compiler;
        progressWatcher: ProgressWatcher;
    });
    watch(): void;
    invalidate(): void;
    stop(onStop?: () => void): void;
    emit(type: WatchHandleEvent.Build, error: undefined, build: CompilerBuild): boolean;
    emit(type: WatchHandleEvent.Build, error: Error): boolean;
    emit(type: WatchHandleEvent.Stop): boolean;
    emit(type: WatchHandleEvent.ProgressStart): boolean;
    emit(type: WatchHandleEvent.ProgressComplete): boolean;
    on(type: WatchHandleEvent.Build, callback: (error: undefined | Error, build: CompilerBuild | undefined) => void): this;
    on(type: WatchHandleEvent.Stop, callback: () => void): this;
    on(type: WatchHandleEvent.ProgressStart, callback: () => void): this;
    on(type: WatchHandleEvent.ProgressComplete, callback: () => void): this;
    once(type: WatchHandleEvent.Build, callback: (error: undefined | Error, build: CompilerBuild | undefined) => void): this;
    once(type: WatchHandleEvent.Stop, callback: () => void): this;
    once(type: WatchHandleEvent.ProgressStart, callback: () => void): this;
    once(type: WatchHandleEvent.ProgressComplete, callback: () => void): this;
    private onProgressStart;
    private onProgressComplete;
}