import { z } from "#compiled/zod/index.js";
/** Provider-reported token usage and optional model token cost totals. */
export type TokenUsage = z.infer<typeof tokenUsageWithCostSchema>;
/** Current schema for provider-reported token usage and model token cost. */
export declare const tokenUsageWithCostSchema: z.ZodObject<{
    cacheReadTokens: z.ZodNumber;
    cacheWriteTokens: z.ZodNumber;
    inputTokens: z.ZodNumber;
    outputTokens: z.ZodNumber;
    costUsd: z.ZodOptional<z.ZodNumber>;
}, z.core.$strip>;
/** Adds two usages; the cost is absent only when neither reported one. */
export declare function addTokenUsage(a: TokenUsage, b: TokenUsage): TokenUsage;