diff --git a/core/package.json b/core/package.json
index 57f000188c..5ef20f6e09 100644
--- a/core/package.json
+++ b/core/package.json
@@ -5,7 +5,6 @@
   "private": true,
   "scripts": {
     "build:js": "node ./scripts/js/babel-es6-build.js",
-    "check:js": "node ./scripts/js/babel-es6-check.js",
     "watch:js": "cross-env NODE_ENV=development node ./scripts/js/babel-es6-watch.js",
     "lint:core-js": "node ./node_modules/eslint/bin/eslint.js --ext=.es6.js . --fix || exit 0",
     "lint:css": "stylelint \"**/*.css\" || exit 0",
@@ -23,9 +22,10 @@
     "eslint-plugin-jsx-a11y": "4.0.0",
     "eslint-plugin-react": "6.10.3",
     "glob": "7.1.1",
+    "minimist": "^1.2.0",
     "stylelint": "^7.10.1",
-    "stylelint-config-standard": "^16.0.0",
     "stylelint-checkstyle-formatter": "^0.1.0",
+    "stylelint-config-standard": "^16.0.0",
     "stylelint-no-browser-hacks": "^1.0.2"
   },
   "babel": {
diff --git a/core/scripts/js/babel-es6-build.js b/core/scripts/js/babel-es6-build.js
index 0178d44ec5..af25203336 100644
--- a/core/scripts/js/babel-es6-build.js
+++ b/core/scripts/js/babel-es6-build.js
@@ -9,10 +9,8 @@
 
 'use strict';
 
-const fs = require('fs');
-const path = require('path');
 const glob = require('glob');
-
+const argv = require('minimist')(process.argv.slice(2));
 const changeOrAdded = require('./changeOrAdded');
 const log = require('./log');
 
@@ -31,10 +29,10 @@ const processFiles = (error, filePaths) => {
 };
 
 // Run build:js with some special arguments to only parse specific files.
-// npm run build:js -- --files misc/drupal.es6.js misc/drupal.init.es6.js
+// npm run build:js -- --file misc/drupal.es6.js --file misc/drupal.init.es6.js
 // Only misc/drupal.es6.js misc/drupal.init.es6.js will be processed.
-if (process.argv.length > 2 && process.argv[2] === '--files') {
-  processFiles(null, process.argv.splice(3, process.argv.length));
+if (argv.file) {
+  processFiles(null, [].concat(argv.file));
 }
 else {
   glob(fileMatch, globOptions, processFiles);
diff --git a/core/scripts/js/changeOrAdded.js b/core/scripts/js/changeOrAdded.js
index c791ee5216..db8c3046f9 100644
--- a/core/scripts/js/changeOrAdded.js
+++ b/core/scripts/js/changeOrAdded.js
@@ -1,14 +1,28 @@
 const fs = require('fs');
-
 const log = require('./log');
 const transpile = require('./transpile');
+const argv = require('minimist')(process.argv.slice(2));
 
 module.exports = (filePath) => {
-  const moduleName = filePath.slice(0, -7);
   log(`'${filePath}' is being processed.`);
   // Transform the file.
   transpile(filePath, function check(code) {
       const fileName = filePath.slice(0, -7);
+
+      if(argv.check) {
+        fs.readFile(`${fileName}.js`, function read(err, data) {
+          if (err) {
+            throw err;
+          }
+          if (code != data) {
+            log(`${fileName}.js`);
+            throw new Error(`'${filePath}' is not updated.`);
+          }
+        });
+
+        return;
+      }
+
       // Write the result to the filesystem.
       fs.writeFile(`${fileName}.js`, code, () => {
         log(`'${filePath}' is finished.`);
diff --git a/core/scripts/js/transpile.js b/core/scripts/js/transpile.js
index b7e89ff2a9..018ec37692 100644
--- a/core/scripts/js/transpile.js
+++ b/core/scripts/js/transpile.js
@@ -1,4 +1,3 @@
-const fs = require('fs');
 const babel = require('babel-core');
 
 module.exports = (filePath, callback) => {