export type HerdrWebScrollDirection = 'up' | 'down' | null;
export interface HerdrWebHistoryState {
    history: string[];
    frame: string[];
}
export interface HerdrWebHistoryMerge {
    state: HerdrWebHistoryState;
    addedLines: number;
}
export declare function mergeHerdrWebSnapshot(state: HerdrWebHistoryState | null, snapshot: string, direction: HerdrWebScrollDirection, maxChars?: number): HerdrWebHistoryMerge;
export declare function renderHerdrWebHistory(state: HerdrWebHistoryState): string;
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