interface ResolveInfo {
    request: string;
    resolved?: string;
    parent?: string;
}
interface LoadInfo extends ResolveInfo {
    cacheHit: boolean;
    moduleSystem: "cjs" | "esm";
}
export interface ModuleLoadObserver {
    onResolve?(info: ResolveInfo): void;
    onLoadStart?(info: LoadInfo): unknown;
    onLoadEnd?(info: LoadInfo, token: unknown, error?: unknown): void;
    onError?(error: unknown): void;
}
export interface ModuleObserverRegistration {
    run<T>(action: () => T): T;
    enter(): () => void;
    dispose(): void;
}
declare class ModuleObserverRegistry {
    private readonly _active;
    private readonly _insideCommonJsLoad;
    private _registrationCount;
    private _originalResolve?;
    private _originalLoad?;
    private _installedResolve?;
    private _installedLoad?;
    private _commonJsHookState?;
    private _esmHooks?;
    register(observer: ModuleLoadObserver): ModuleObserverRegistration;
    private _appendObserver;
    private _install;
    private _installCommonJsHooks;
    private _installEsmHooks;
    private _startLoad;
    private _endLoad;
    private _notify;
    private _safe;
    private _uninstall;
}
export declare const moduleObserverRegistry: ModuleObserverRegistry;
export {};