export interface TranscriptScrollPort {
    scrollBy(dy: number): boolean;
    scrollToTop(): boolean;
    scrollToBottom(): boolean;
    updateAutoScroll(x: number, y: number): void;
    stopAutoScroll(): void;
    readonly active: boolean;
    readonly metrics: ScrollMetrics;
    onMetrics(listener: (metrics: ScrollMetrics) => void): () => void;
}
export interface ScrollMetrics {
    readonly linesAbove: number;
    readonly linesBelow: number;
}
export declare const EMPTY_SCROLL_METRICS: ScrollMetrics;
type Handler = (dy: number) => void;
type JumpHandler = () => void;
type AutoScrollHandler = {
    update(x: number, y: number): void;
    stop(): void;
};
export declare const transcriptScrollPort: TranscriptScrollPort;
export declare function registerTranscriptScrollPort(next: Handler): () => void;
export declare function registerTranscriptJumpHandlers(top: JumpHandler, bottom: JumpHandler): () => void;
export declare function registerTranscriptAutoScroll(next: AutoScrollHandler): () => void;
export declare function publishTranscriptScrollMetrics(next: ScrollMetrics): void;
export {};