export type ClientWorkerType = Worker | undefined;
export type ClientWorkerPromise = Promise<ClientWorkerType>;
export type ClientWorkerFactory = () => ClientWorkerType | ClientWorkerPromise;
export type ClientWorkerArg = ClientWorkerType | ClientWorkerPromise | ClientWorkerFactory;
/**
 * Initializes a Web Worker or the worker context for message communication.
 * @param prevWorker The previous worker promise to deinitialize
 * @param worker The new worker argument (Worker instance, promise, or factory function)
 * @param handler The message event handler to attach
 * @returns A promise resolving to the initialized Worker or undefined if in worker context
 */
export declare function initializer(prevWorker: ClientWorkerPromise, worker: ClientWorkerArg, handler: (event: MessageEvent) => void): Promise<Worker | undefined>;