export interface IBabelConfigOptions {
  target: 'node';
  type?: 'esm' | 'cjs';
  typescript: boolean;
  runtimeHelpers?: boolean;
  filePath?: string;
  browserFiles?: {
    [value: string]: any;
  };
  nodeVersion?: number;
  nodeFiles?: {
    [value: string]: any;
  };
}

export default function(
  options: IBabelConfigOptions
) {
  const {
    target,
    typescript,
    type,
    runtimeHelpers,
    filePath,
    browserFiles,
    nodeFiles,
    nodeVersion
  } = options;

  const targets = { node: nodeVersion || 8 };

  return {
    presets: [
      ...(typescript ? [require.resolve('@babel/preset-typescript')] : []),
      [require.resolve('@babel/preset-env'), { targets, modules: type === 'esm' ? false : 'auto' }],
    ]
  };
}