/**
 * Canary token injection for detecting LLM data leakage.
 *
 * Injects unique, trackable tokens into obfuscated prompts. These tokens
 * serve no semantic purpose but can be monitored for leakage -- if a canary
 * appears in another user's output or in a training data audit, it proves
 * your data was exposed.
 */
export interface CanaryToken {
    token: string;
    sessionId: string;
    timestamp: number;
    messageIndex: number;
}
export declare class CanaryInjector {
    private readonly _prefix;
    private readonly _secret;
    private _sessionId;
    private _messageCounter;
    private _tokens;
    constructor(prefix: string, secretKey: string);
    get sessionId(): string;
    /** Inject a canary token into text. Returns modified text. */
    inject(text: string): string;
    /** Return all canary tokens injected in this session. */
    getTokens(): CanaryToken[];
    /** Check if any known canary tokens appear in given text. */
    checkLeak(text: string): CanaryToken[];
    /** Reset for a new session. */
    reset(): void;
}