Ensure that all node modules are made es5 compatible

gruntfile.js

@@ -21,11 +21,21 @@ module.exports = function(grunt) {
           },
         ],
       },
+      bundle: {
+        files: [
+          {
+            cwd: './build',
+            expand: true,
+            src: ['exceljs.bare.js', 'exceljs.js'],
+            dest: './dist/',
+          },
+        ],
+      },
     },
     browserify: {
       bare: {
         src: ['./build/lib/exceljs.bare.js'],
-        dest: './dist/exceljs.bare.js',
+        dest: './build/exceljs.bare.js',
         options: {
           browserifyOptions: {
             standalone: 'ExcelJS',
@@ -34,7 +44,7 @@ module.exports = function(grunt) {
       },
       bundle: {
         src: ['./build/lib/exceljs.browser.js'],
-        dest: './dist/exceljs.js',
+        dest: './build/exceljs.js',
         options: {
           browserifyOptions: {
             standalone: 'ExcelJS',
@@ -48,6 +58,7 @@ module.exports = function(grunt) {
     },
     terser: {
       options: {
+        sourceMap: true,
         output: {
           preamble: '/*! ExcelJS <%= grunt.template.today("dd-mm-yyyy") %> */\n',
         },
@@ -94,6 +105,6 @@ module.exports = function(grunt) {
     },
   });
 
-  grunt.registerTask('build', ['babel', 'browserify', 'terser', 'copy']);
+  grunt.registerTask('build', ['babel:dist', 'browserify', 'babel:bundle', 'terser', 'copy']);
   grunt.registerTask('ug', ['terser']);
 };

package.json

@@ -47,10 +47,9 @@
     "lint:fix": "prettier-eslint --write $(pwd)'/**/*.js'",
     "lint:staged": "lint-staged",
     "clean": "rm -rf build/ && rm -rf dist",
-    "patch:fast-csv": "node _patch-fast-csv.js",
     "benchmark": "node --expose-gc benchmark",
     "benchmark:debug": "node --expose-gc --inspect-brk --trace-deopt benchmark",
-    "build": "npm run patch:fast-csv && grunt build",
+    "build": "grunt build",
     "preversion": "npm run clean && npm run build && npm run test:all && npm run test:dist",
     "postversion": "git push --no-verify && git push --tags --no-verify"
   },