import type { NexusAIConfig } from '../types/config.js';
import type { CostEstimate } from '../types/planning.js';
import type { CacheTtl } from '../types/providers.js';
/**
 * Budget enforcement lives in `optimizer/budget.ts`, which carries no registry dependency, and is
 * re-exported here so every existing import of this module keeps resolving.
 */
export { CostBudgetError, DEFAULT_CURRENCY, assertWithinCostBudget, formatCost } from './cost-budget.js';
/** Input for `estimateCost()`. */
export interface CostEstimateInput {
    /** The model, or an alias. */
    model: string;
    /** Input tokens billed at the standard rate. */
    inputTokens: number;
    /** Output tokens. Defaults to 0. */
    outputTokens?: number;
    /** Tokens the provider served from its prompt cache, billed at the cached-read rate. */
    cachedReadTokens?: number;
    /** Tokens the provider wrote into its prompt cache, billed at the cache-write rate. */
    cachedWriteTokens?: number;
    /** Cache lifetime the request asked for; long-lived writes cost more on some providers. */
    cacheTtl?: CacheTtl;
    /** Application registry entries and prices. */
    config?: Pick<NexusAIConfig, 'models'>;
}
/**
 * Prices a request from the model registry, with cached reads and writes on their own lines.
 * Unknown models cost 0.
 */
export declare function estimateCost(input: CostEstimateInput): CostEstimate;