import type { CdpTransport } from "./protocol.js";
/** The handler bookkeeping every socket-backed CDP transport shares. Subclasses
 *  send frames and close their socket; they report incoming data and closes
 *  through {@link emitMessage} and {@link emitClose}. */
export declare abstract class CallbackTransport implements CdpTransport {
    private messageHandler;
    private closeHandler;
    abstract send(data: string): void;
    protected abstract closeSocket(): void;
    onMessage(cb: (data: string) => void): void;
    onClose(cb: (reason?: string) => void): void;
    close(): Promise<void>;
    protected emitMessage(data: string): void;
    protected emitClose(reason: string): void;
}
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