export interface PartRead {
    at: string;
    by: string;
    doc: string;
    version: number;
    part: number;
    parts: number;
}
export declare class PartJournal {
    readonly path: string;
    private readonly seen;
    private tornTail?;
    constructor(path: string);
    private index;
    /** The parts of one version `by` has read, ascending. */
    partsRead(by: string, doc: string, version: number): number[];
    /** Record one read. The index is updated first; a failed write only costs a repeat read after a restart. */
    record(r: PartRead): void;
}
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