/**
 * Fallback for `defineWorkerModule` that behaves identically but runs in the main
 * thread, for when the execution environment doesn't support web workers or they
 * are disallowed due to e.g. CSP security restrictions.
 */
export function defineMainThreadModule(options: any): {
    (...args: any[]): Promise<any>;
    _getInitResult(): Promise<any>;
};