/**
 * The pane's end of the mirror's wire: connect, attach, read lines, speak.
 *
 * The mirror may still be coming up when the pane starts - the split opens,
 * a shell starts, then this - so a refused connection is retried a few times
 * before it is given up on. Everything else is one JSON object per line.
 */
import type { MirrorIn, MirrorOut } from "../src/mirror.ts";
/** A connection to one subagent's mirror. */
export type MirrorClient = {
    /** Sends a steer or a stop. Dropped silently once the line is gone. */
    send(input: MirrorIn): void;
    /** Hangs up. The subagent does not notice. */
    close(): void;
};
/** What the client needs, and what it reports. */
export type ClientOptions = {
    /** The mirror's socket path. */
    socket: string;
    /** The subagent to attach to. */
    id: string;
    /** One parsed line from the mirror. */
    onLine(line: MirrorOut): void;
    /** The line went, or never came: `reason` says which. */
    onEnd(reason?: string): void;
    /** Connection attempts before giving up. Defaults to 15, 200 ms apart. */
    retries?: number;
};
/** Attaches to `id` over `socket`. Never throws: what went wrong reaches `onEnd`. */
export declare function attachTo(options: ClientOptions): MirrorClient;
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