import { Scanner, Progress, ScannerFactory } from '../scanner.js';
import { Event } from '../../event.js';
/**
 * Branch scanner that emits a synthetic Start event tagged with
 * `{ [key]: value }` metadata. Used to retroactively attach metadata to
 * an emitted interval — Search reads the branch's Start metadata and
 * merges it into the original state's Start event.
 */
export declare class Label implements Scanner {
    private key;
    private value;
    id: string;
    private eventQueue;
    constructor(key: string, value: any);
    get complete(): boolean;
    get lastclosed(): number;
    get lastreceived(): number;
    reindex(newIndex: number): void;
    shift(event: Event): Progress;
    static factory(key: string, value: any): ScannerFactory;
}
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