import type { NormalizedUsage } from "../../agents/usage.js";
import type { ReplyPayload } from "../types.js";
export declare const isBunFetchSocketError: (message?: string) => boolean;
export declare const formatBunFetchSocketError: (message: string) => string;
export declare const formatResponseUsageLine: (params: {
    usage?: NormalizedUsage;
    showCost: boolean;
    costConfig?: {
        input: number;
        output: number;
        cacheRead: number;
        cacheWrite: number;
    };
}) => string | null;
export declare const appendUsageLine: (payloads: ReplyPayload[], line: string) => ReplyPayload[];