import type { CostEstimate } from '../types';
/**
 * Estimate input cost for a given token count.
 *
 * Returns a cost estimate only when custom pricing is provided via
 * `OptimizerConfig.pricing`. Returns undefined otherwise.
 */
export declare function estimateCost(tokens: number, _model: string, customPricing?: {
    inputPer1M: number;
    provider?: string;
}): CostEstimate | undefined;