/**
 * QuadStore - In-memory quad store for observations
 *
 * Stores observations as Subject-Predicate-Object-namedGraph quads with timestamps.
 * This is the unified data model for all shared state in Haibun.
 */
import { IQuadStore, TQuad, TQuadPattern } from './quad-types.js';
export declare class QuadStore implements IQuadStore {
    private quads;
    add(quad: Omit<TQuad, 'timestamp'>): void;
    query(pattern: TQuadPattern): TQuad[];
    select(subject: string, predicate: string): unknown | undefined;
    clear(namedGraph?: string): void;
    remove(pattern: TQuadPattern): void;
    all(): TQuad[];
}
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