export declare class KnowledgeBase {
    private store;
    private storePath;
    constructor(baseDir?: string);
    private load;
    private save;
    addFile(filePath: string): Promise<{
        chunks: number;
    }>;
    addText(text: string, source?: string): Promise<{
        chunks: number;
    }>;
    search(query: string, topK?: number): Promise<Array<{
        content: string;
        score: number;
        source: string;
    }>>;
    /** Build context string for injection into LLM calls */
    getContext(query: string, topK?: number, minScore?: number): Promise<string>;
    /**
     * Query DeepBrain for semantic search enhancement.
     * Activated when OPC_DEEPBRAIN_ENABLED=true and deepbrain CLI is globally installed.
     */
    private queryDeepBrain;
    getStats(): {
        totalEntries: number;
        sources: string[];
        updatedAt: string;
    };
    clear(): void;
    removeSource(source: string): number;
}
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