type Handlers = Record<string, (payload: any) => any>;
export type Dispatch<T extends Handlers> = {
    [K in keyof T]: T[K] extends (payload: infer P) => infer R ? [P, Awaited<R>] : never;
};
export declare function commander<T extends Handlers>(handlers: T): (event: MessageEvent<{
    id: number;
    command: keyof T;
    payload: Parameters<T[keyof T]>[0];
}>) => Promise<void>;
export {};