import type { ActivitySnapshot, SessionIdentity } from './types.js';
/** Incremental reads keep UI refreshes bounded even when a helper inherits a large log. */
export declare class ActivityReader {
    private readonly root;
    private readonly identity;
    private readonly budget;
    private parser;
    private offset;
    private signature;
    private mtime;
    private head;
    private anchor;
    private pending;
    private skipping;
    constructor(root: string, identity: SessionIdentity, budget?: number);
    private reset;
    read(): Promise<ActivitySnapshot>;
    private feed;
}
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