import type { Ref } from "vue";
export interface TLogDataSource {
    lineCount(): number;
    getLine(index: number): string;
    getLineKey?: (index: number) => string | number;
    firstLineIndex?: () => number;
}
export type CreateAppendOnlyLogStoreOptions = Readonly<{
    maxLines?: number;
}>;
export type AppendOnlyLogStore = Readonly<{
    source: TLogDataSource;
    version: Ref<number>;
    appendLine: (line: string) => void;
    appendLines: (lines: readonly string[]) => void;
    appendChunk: (chunk: string) => void;
    replaceTail: (text: string) => void;
    clear: () => void;
}>;
export type TLogViewVisualIndexStatus = "estimated" | "measuring" | "exact";
export type TLogViewVisualIndexOptions = Readonly<{
    /**
     * Max time spent measuring wrapped visual rows in one scheduler frame.
     * Default: 4ms.
     */
    measureBudgetMs?: number;
    /**
     * Optional retained-window cap for exact visual index work.
     * Undefined means measure the whole retained source window.
     */
    maxMeasuredLines?: number;
}>;
export type TLogViewScrollPayload = Readonly<{
    scrollTop: number;
    atBottom: boolean;
    lineCount: number;
    estimatedVisualRowCount: number;
    visualRowCount: number;
    measuredVisualRowCount: number;
    measuredLineCount: number;
    visualIndexStatus: TLogViewVisualIndexStatus;
    firstLineIndex?: number;
}>;