Update rollup.config.js

fix(): null check + lint

Author: alexandremoore-lmi

rollup.config.js

@@ -2,8 +2,8 @@ import babel from 'rollup-plugin-babel'
 import commonjs from 'rollup-plugin-commonjs'
 import external from 'rollup-plugin-peer-deps-external'
 import resolve from 'rollup-plugin-node-resolve'
-import { terser } from "rollup-plugin-terser";
-import visualizer from "rollup-plugin-visualizer";
+import { terser } from 'rollup-plugin-terser'
+import visualizer from 'rollup-plugin-visualizer'
 import pkg from './package.json'
 
 export default {
@@ -24,22 +24,22 @@ export default {
     external(),
     babel({
       exclude: 'node_modules/**',
-      plugins: [ 'external-helpers' ]
+      plugins: ['external-helpers']
     }),
     resolve(),
     commonjs(),
     terser({
-      // compress: {
-      //   ecma: 6
-      // },
-      sourcemap: false,
-      // toplevel: true
+      compress: {
+        ecma: 6
+      },
+      sourcemap: true,
+      toplevel: true
     }),
     visualizer({
-      title: "@clampy-js/react-clampy bundle visualizer",
+      title: '@clampy-js/react-clampy bundle visualizer',
       open: false,
-      template: "sunburst", // sunburst, treemap, circlepacking, network
-      filename: "./build/bundleStats.html"
+      template: 'sunburst', // sunburst, treemap, circlepacking, network
+      filename: './build/bundleStats.html'
     })
   ]
 }