export declare class ModeTracker {
    private decset;
    /**
     * Kitty keyboard flags in force and the ones pushed before, per screen (the protocol
     * keeps a stack for the main screen and one for the alternate screen).
     */
    private kitty;
    private alt;
    private otherKeys;
    /** DECSTBM: the scroll region of each screen, 1-based and inclusive, or none. */
    private regions;
    /** DECSCUSR: the cursor's shape (0: the terminal's default). */
    private cursorShape;
    /** The G0 character set (B: ASCII, 0: line drawing). */
    private g0;
    private carry;
    /** Follow a chunk of the program's output. */
    feed(chunk: string): void;
    /** A resize resets the scroll region, as terminals do. */
    resized(): void;
    private stack;
    private reset;
    private apply;
    /** The scroll region in force, if any (the snapshot sets it after its content). */
    scrollRegion(): [number, number] | undefined;
    /** Sequences that put a fresh terminal in these modes (the scroll region aside). */
    restore(): string;
}
/**
 * The escape sequence the program's output has started and not finished (a chunk may end
 * inside one). An attach's snapshot is taken between two chunks: the part already written
 * is in the mirror's parser but not in the snapshot, so it goes to the client first.
 */
export declare class StreamTail {
    private state;
    private buf;
    feed(chunk: string): void;
    /** The unfinished sequence so far ("" between sequences). */
    text(): string;
}