export type ReloadHandler = (moduleId: string) => void | Promise<void>;
export declare class HotReload {
    private reload;
    private debounceMs;
    private pending;
    private inFlight;
    private rePending;
    private timer?;
    private flushing;
    constructor(reload: ReloadHandler, debounceMs?: number);
    queue(moduleId: string): void;
    clear(): void;
    private scheduleFlush;
    private flush;
    private reloadOne;
}