import { ITokenizer } from './i-tokenizer.js';
/**
 * Pluggable tokenizer factory — addresses issues #123 / #124.
 *
 * Resolution order:
 *   1. Google AI models (`gemini-*`) — GoogleAITokenizer when
 *      GOOGLE_AI_API_KEY is set, else HeuristicTokenizer.
 *   2. Tiktoken-compatible families (GPT, Claude) — TiktokenTokenizer.
 *   3. HeuristicTokenizer fallback for everything else.
 *
 * Instances are cached per model name so callers don't pay for repeated
 * allocation of the native tiktoken encoder, and so their per-tokenizer
 * LRU caches can be shared across call sites.
 */
export declare class TokenizerFactory {
    private static readonly instances;
    static create(modelName: string): ITokenizer;
    static createFromEnv(): ITokenizer;
    /**
     * Release every cached tokenizer. Call this on server shutdown so
     * native tiktoken encoders are freed.
     */
    static disposeAll(): void;
    private static build;
}
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