/**
 * TokenEstimator — singleton wrapper around js-tiktoken (cl100k_base).
 *
 * Provides accurate token counting for Korean + English text.
 * Falls back to byte-length heuristic if WASM init fails or during loading.
 *
 * Uses dynamic import to avoid blocking vitest fork initialization.
 */
/**
 * Initialize the encoder asynchronously. Safe to call multiple times.
 */
export declare function initTokenEstimator(): Promise<void>;
/**
 * Count tokens in text. Uses js-tiktoken if available, else byte fallback.
 */
export declare function countTokens(text: string): number;
/**
 * Check if text exceeds a token limit.
 */
export declare function exceedsLimit(text: string, limit: number): boolean;
/**
 * Check whether the real encoder is active (vs fallback).
 */
export declare function isEncoderActive(): boolean;
/**
 * Reset singleton state (for testing).
 */
export declare function resetTokenEstimator(): void;
/**
 * Force fallback mode (for testing).
 */
export declare function forceFallbackMode(): void;
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