export declare const babel: ({ istanbulCwd }: {
    istanbulCwd: string | undefined;
}) => {
    loader: string;
    options: {
        babelrc: boolean;
        sourceType: string;
        compact: boolean;
        plugins: (string | {
            all: boolean;
            cwd: string | undefined;
            sourceMap: boolean;
            useInlineSourceMaps: boolean;
            excludeNodeModules: boolean;
            instrument: boolean;
            reporter: string[];
            include: string[];
            extension: string[];
            exclude: string[];
        })[][];
    };
};