export declare class SemanticDetector {
    private static instance;
    private pipe;
    private isLoading;
    private knownThreats;
    private threatEmbeddings;
    private constructor();
    static getInstance(): SemanticDetector;
    init(): Promise<void>;
    scan(input: string, threshold?: number): Promise<{
        detected: boolean;
        reason?: string;
        score?: number;
    }>;
    private cosineSimilarity;
}