import type { Compiler, Configuration, Stats, Watching } from 'webpack';
export type CompilerServerState = 'idle' | 'ready';
export type StatsObjectOptions = Exclude<Configuration['stats'], boolean | string | undefined>;
export type CallbackKey = 'done' | 'watchRun' | 'invalid';
export type CallbackValue = ((stats?: Stats, error?: Error | Error[]) => void) | undefined;
export type BaseCompilerWatchingContext = {
    compiler: Compiler;
    watching?: Watching;
    state: CompilerServerState;
    callbacks: {
        [key in CallbackKey]: CallbackValue[];
    };
    stats?: Stats;
};
export declare const normalizeStatsOptions: (statsOptions: Configuration["stats"]) => StatsObjectOptions;
export declare abstract class BaseCompilerWatching {
    private context;
    constructor(compiler: Compiler);
    setupWatching(): void;
    isReady(): boolean;
    setCallback(key: CallbackKey, callback: CallbackValue): void;
    invalidate(): Promise<void | Error>;
    resume(): Promise<void>;
    suspend(): Promise<void>;
    close(): Promise<void | Error>;
}