export interface ComplexityRouterConfig {
    cheapModel?: string;
    /**
     * Cheap model to fall back to per provider family, keyed by a substring of the
     * requested model id ('claude', 'gemini', ...). Overridable from lemma.config.json
     * so a retired model id can be corrected without shipping a new build.
     */
    cheapModelsByFamily?: Record<string, string>;
    complexKeywords?: string[];
    complexityThreshold?: number;
    disabled?: boolean;
}
export declare class ComplexityRouter {
    private cheapModel;
    private cheapModelsByFamily;
    private complexKeywords;
    private syntaxDensityThreshold;
    constructor(config?: ComplexityRouterConfig);
    updateConfig(config: ComplexityRouterConfig): void;
    evaluate(prompt: string, originalModel?: string): {
        model: string;
        complexity: 'low' | 'high';
    };
}
export default ComplexityRouter;
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