import { Scanner, Progress, ScannerFactory } from '../scanner.js';
import { Event } from '../../event.js';
/**
 * Branch scanner that delegates to a child scanner, emitting its output
 * only when the observed start event satisfies `predicate`.
 */
export declare class Where implements Scanner {
    private child;
    readonly predicate: (start: Event.Start) => boolean;
    id: string;
    /**
     * NOTE: The original branch stored `predicate` but never applied it.
     * Preserving that shape here; the filter semantics need to be defined
     * once Search's branch-processing loop is rewritten (task #4).
     */
    constructor(child: Scanner, predicate: (start: Event.Start) => boolean);
    get complete(): boolean;
    get lastclosed(): number;
    get lastreceived(): number;
    reindex(newIndex: number): void;
    shift(event: Event): Progress;
    static factory(child: ScannerFactory, condition: (start: Event.Start) => boolean): ScannerFactory;
}
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