export interface SocketTransport {
    send(data: string): void;
    close(): void;
    /** @returns unsubscribe */
    onMessage(listener: (data: string) => void): () => void;
    /** @returns unsubscribe */
    onClose(listener: () => void): () => void;
}
/** The `addEventListener` shape: browsers, Deno, Cloudflare Workers. */
interface EventTargetLike {
    send(data: string): void;
    close(): void;
    addEventListener(type: string, listener: (event: any) => void): void;
    removeEventListener(type: string, listener: (event: any) => void): void;
}
/** The `.on()` shape: `ws` on Node. */
interface EventEmitterLike {
    send(data: string): void;
    close(): void;
    on(type: string, listener: (...args: any[]) => void): void;
    off(type: string, listener: (...args: any[]) => void): void;
}
/**
 * Adapts an `addEventListener`-style socket — a browser `WebSocket`,
 * `Deno.upgradeWebSocket`'s socket, or a Cloudflare Workers `WebSocketPair` end.
 */
export declare function fromEventTarget(socket: EventTargetLike): SocketTransport;
/**
 * Adapts a Node `EventEmitter`-style socket — a `ws` connection.
 *
 * `ws` v8 hands the payload as a `Buffer` even for text frames, so it is
 * stringified here. Binary frames therefore arrive as their UTF-8
 * interpretation; this package only ever speaks JSON.
 */
export declare function fromEventEmitter(socket: EventEmitterLike): SocketTransport;
export {};
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