import { type RspackPluginFunction } from '@rspack/core';
/**
 * Rspack plugin that defines variables as properties of `import.meta.env` during compile time.
 * It's same as `EnvironmentPlugin` but instead `process.env.{key}` it defines `import.meta.env.{key}`.
 * @param keys Keys, that will be used to copy variables from build environment to bundle.
 * @param options Options.
 * @returns Plugin function.
 */
export declare function pluginImportMetaEnv(keys: string[], { source, }?: {
    source?: Record<string, string | undefined> | ((varName: string) => string | undefined);
}): RspackPluginFunction;