message: chore: simplify rollup config
diff: @@ -30,7 +30,7 @@ const outputs = [
  format: 'esm',
  sourcemap: true,
  },
  - plugins: plugins('defaults and not IE 11', true),
  + plugins: plugins(undefined, true),
  external: [...Object.keys(pkg.dependencies), ...Object.keys(pkg.peerDependencies)],
  },
  ];
  @@ -42,7 +42,7 @@ for (const build of ['es5', 'es6']) {
  output: [
  {
  file: `${buildFolder}/vega-embed.js`,
  - format: 'umd', // cannot do iife because rollup generates code that expects Vega-Lite to be present
  + format: 'umd',
  sourcemap: true,
  name: 'vegaEmbed',
  globals: {
  