/**
 * Specification of the methods exposed by EchoWorker
 * for parent proxying.
 */
export declare const workerSpec: {
    /**
     * Proxy method for echoing a message.
     */
    readonly echo: (req: {
        msg: string;
    }) => Promise<{
        echoed: string;
    }>;
    /**
     * Proxy method for converting a message to uppercase.
     */
    readonly shout: (req: {
        msg: string;
    }) => Promise<{
        upper: string;
    }>;
};