import { CustomMessage, UserMessage } from '../../../backend/message.cjs';
import { LanguageModelUsage, ToolCallPart } from 'ai';
import { m as ChatModelUsage } from '../../../chat-C20nYj46.cjs';
import '../../../internals/serializable.cjs';
import '../../../internals/types.cjs';
import '../../../internals/helpers/guards.cjs';
import '../../../context.cjs';
import '../../../emitter-D4OcelZ9.cjs';
import '../../../internals/helpers/promise.cjs';
import '../../../errors.cjs';
import 'promise-based-task';
import '../../../cache/base.cjs';
import '../../../backend/constants.cjs';
import '../../../tools/base.cjs';
import 'ajv';
import '../../../internals/helpers/schema.cjs';
import 'zod';
import 'zod-to-json-schema';
import '../../../template.cjs';
import '../../../logger/logger.cjs';
import 'pino';

/**
 * Copyright 2025 © BeeAI a Series of LF Projects, LLC
 * SPDX-License-Identifier: Apache-2.0
 */

declare function encodeCustomMessage(msg: CustomMessage): UserMessage;
declare function decodeCustomMessage(value: string): {
    role: string;
    content: string;
} | undefined;
declare function vercelFetcher(customFetch?: typeof fetch): typeof fetch;
declare function parseHeadersFromEnv(env: string): Record<string, any>;
declare function extractTokenUsage(usage: LanguageModelUsage): ChatModelUsage;
declare function mergeTokenUsage(target: ChatModelUsage, ...sources: ChatModelUsage[]): void;
declare function isToolCallValid(obj: ToolCallPart): boolean;

export { decodeCustomMessage, encodeCustomMessage, extractTokenUsage, isToolCallValid, mergeTokenUsage, parseHeadersFromEnv, vercelFetcher };