import type { TaskState } from '../task/task-state.js';
export declare class TaskFileWriter {
    private readonly root;
    private readonly ensuredDirs;
    constructor(root: string);
    private taskDir;
    private ensureDir;
    writeMeta(task: TaskState): Promise<void>;
    appendSummary(taskId: string, line: string): Promise<void>;
    appendVerbose(taskId: string, line: string): Promise<void>;
    appendTimeline(taskId: string, line: string): Promise<void>;
    /** Append a raw JSON event line to events.jsonl for full debug tracing. */
    appendEvent(taskId: string, event: unknown): Promise<void>;
    /** Read a persisted task's events.jsonl. Returns null if missing. */
    readEventsLog(taskId: string): Promise<string | null>;
    /** Read a persisted task's meta.json. Returns null if missing or corrupt. */
    readMeta(taskId: string): Promise<TaskState | null>;
    /** Read a persisted task's verbose.log. Returns null if missing. */
    readVerboseLog(taskId: string): Promise<string | null>;
    /** Read a persisted task's summary.log. Returns null if missing. */
    readSummaryLog(taskId: string): Promise<string | null>;
    /** Read a persisted task's timeline.log. Returns null if missing. */
    readTimeline(taskId: string): Promise<string | null>;
    /** List all task IDs that have a persisted directory with meta.json. */
    listPersistedTaskIds(): Promise<string[]>;
}