/**
 * A fixed-height rolling tail under a spinner header, so a slow step shows live
 * progress instead of a frozen spinner. Modeled on nanoclaw's windowed-runner.
 *
 * Purely transient: `start` opens the pane, `push` feeds it lines, `clear` wipes it
 * and restores the cursor. The caller (the step runner) emits the permanent ✓/✗ line,
 * so the pane never competes with clack's log output. On a non-TTY (CI/piped) every
 * method is a no-op and lines are dropped; the runner's plain status line is enough.
 */
export declare class LivePane {
    private readonly tty;
    private readonly lines;
    private label;
    private start0;
    private frame;
    private ticker?;
    start(label: string): void;
    push(chunk: string): void;
    clear(): void;
    private redraw;
}
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