import type { IProjectConfig } from '@tarojs/taro/types/compile';
import type { CompilerTypes, CompilerWebpackTypes } from '@tarojs/taro/types/compile/compiler';
type WebpackMerge = (...configs: Array<object | null | undefined>) => object;
export interface ConfigEnv {
    /** taro 当前执行的命令 */
    command: string;
    /** 当前模式 (mode) */
    mode: string;
}
export type UserConfigFn<T extends CompilerTypes = CompilerWebpackTypes> = (merge: WebpackMerge, env: ConfigEnv) => IProjectConfig<T> | Promise<IProjectConfig<T>>;
export type UserConfigExport<T extends CompilerTypes = CompilerWebpackTypes> = IProjectConfig<T> | Promise<IProjectConfig<T>> | UserConfigFn;
/**
 * @since v3.6.9
 * @warning 暂不支持 react native
 */
export declare function defineConfig<T extends CompilerTypes = CompilerWebpackTypes>(config: UserConfigExport<T>): UserConfigExport<T>;
export {};