/** One terminal-session frame carried in a §13.6 rail data payload. `end.reason` is an
 *  APPLICATION-defined bounded token (the reference manager uses `process-exit` / `closed` /
 *  `expired` / `target-despawn` / `manager-restart`); the vocabulary is not fixed by the wire, so
 *  a different endpoint can surface its own terminal causes without a core change. */
export type TerminalFrame = {
    k: "ready";
} | {
    k: "data";
    b: string;
} | {
    k: "resize";
    cols: number;
    rows: number;
} | {
    k: "end";
    reason: string;
} | {
    k: "drop";
    bytes: number;
};
/** Encode raw terminal bytes as a `data` frame (the ruled base64-in-JSON form). Accepts any
 *  Uint8Array (a node Buffer is one). FAIL-LOUD on a non-Uint8Array: a STRING (e.g. xterm's onData
 *  keystroke, which is a string, not bytes) would `base64Encode` its chars as NaN→0 and silently
 *  ship NUL bytes the pty ignores — the browser must UTF-8-encode first. Throwing turns that trap
 *  into an immediate error instead of a byte stream that vanishes into the terminal (§13.6). */
export declare function encodeTerminalData(bytes: Uint8Array): TerminalFrame;
/** The bytes carried by a decoded `data` frame, as a Uint8Array (a node Buffer is one; the manager
 *  bridge decodes utf8 via TextDecoder, the browser writes the bytes straight to xterm). */
export declare function terminalFrameBytes(frame: Extract<TerminalFrame, {
    k: "data";
}>): Uint8Array;
/** Fail-loud closed-schema parse of a terminal-session frame from a rail's opaque `data`. An
 *  unknown kind, an extra field, or a malformed value THROWS — the rail turns that into a protocol
 *  error, so a corrupt frame can never reach the terminal as a partial write. */
export declare function decodeTerminalFrame(data: unknown): TerminalFrame;
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