import { Thread, type ThreadOptions, type ThreadMessageTarget } from '../Thread.ts';
/**
 * Creates a thread from a `MessagePort` instance in the browser.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/MessagePort
 *
 * @example
 * import {ThreadMessagePort} from '@quilted/threads';
 *
 * const channel = new MessageChannel();
 *
 * const threadOne = new ThreadMessagePort(channel.port1);
 * const threadTwo = new ThreadMessagePort(channel.port2, {
 *   exports: {
 *     async sendMessage(message) {
 *       console.log(message);
 *     },
 *   },
 * });
 *
 * channel.port1.start();
 * channel.port2.start();
 *
 * await threadOne.imports.sendMessage('Hello world!');
 */
export declare class ThreadMessagePort<Imports = Record<string, never>, Exports = Record<string, never>> extends Thread<Imports, Exports> {
    readonly port: MessagePort;
    /**
     * Starts a thread wrapped around a `MessagePort` object, and returns the imports
     * of the thread.
     *
     * @example
     * ```ts
     * import {ThreadMessagePort} from '@quilted/threads';
     *
     * const channel = new MessageChannel();
     *
     * ThreadMessagePort.export(channel.port1, {
     *   async getMessage() {
     *     return 'Hello, world!';
     *   },
     * });
     *
     * const {getMessage} = ThreadMessagePort.import(channel.port2);
     *
     * channel.port1.start();
     * channel.port2.start();
     *
     * const message = await getMessage(); // 'Hello, world!'
     * ```
     */
    static import<Imports = Record<string, never>>(port: MessagePort, options?: Omit<ThreadOptions<Imports, Record<string, never>>, 'exports'>): import("../Thread.ts").ThreadImports<Imports>;
    /**
     * Starts a thread wrapped around a `MessagePort` object, providing the second
     * argument as the exports of the thread.
     *
     * @example
     * ```ts
     * import {ThreadMessagePort} from '@quilted/threads';
     *
     * const channel = new MessageChannel();
     *
     * ThreadMessagePort.export(channel.port1, {
     *   async getMessage() {
     *     return 'Hello, world!';
     *   },
     * });
     *
     * const {getMessage} = ThreadMessagePort.import(channel.port2);
     *
     * channel.port1.start();
     * channel.port2.start();
     *
     * const message = await getMessage(); // 'Hello, world!'
     * ```
     */
    static export<Exports = Record<string, never>>(port: MessagePort, exports: Exports, options?: Omit<ThreadOptions<Record<string, never>, Exports>, 'exports' | 'imports'>): void;
    constructor(port: MessagePort, options?: ThreadOptions<Imports, Exports>);
}
export declare function portToMessageTarget(port: Pick<MessagePort, 'postMessage' | 'addEventListener'>): ThreadMessageTarget;
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