diff --git a/core/scripts/js/changeOrAdded.js b/core/scripts/js/changeOrAdded.js
index e6d1a96..c791ee5 100644
--- a/core/scripts/js/changeOrAdded.js
+++ b/core/scripts/js/changeOrAdded.js
@@ -1,33 +1,16 @@
 const fs = require('fs');
-const babel = require('babel-core');
 
 const log = require('./log');
+const transpile = require('./transpile');
 
 module.exports = (filePath) => {
   const moduleName = filePath.slice(0, -7);
   log(`'${filePath}' is being processed.`);
   // Transform the file.
-  // Check process.env.NODE_ENV to see if we should create sourcemaps.
-  babel.transformFile(
-    filePath,
-    {
-      sourceMaps: process.env.NODE_ENV === 'development' ? 'inline' : false,
-      comments: false,
-      plugins: [
-        ['add-header-comment', {
-          'header': [
-            `DO NOT EDIT THIS FILE.\nAll changes should be applied to ${filePath}\nSee the following change record for more information,\nhttps://www.drupal.org/node/2873849\n@preserve`
-          ]
-        }]
-      ]
-    },
-    (err, result) => {
-      if (err) {
-        throw new Error(err);
-      }
+  transpile(filePath, function check(code) {
       const fileName = filePath.slice(0, -7);
       // Write the result to the filesystem.
-      fs.writeFile(`${fileName}.js`, result.code, () => {
+      fs.writeFile(`${fileName}.js`, code, () => {
         log(`'${filePath}' is finished.`);
       });
     }
diff --git a/core/scripts/js/check.js b/core/scripts/js/check.js
index 0a34363..ce484ee 100644
--- a/core/scripts/js/check.js
+++ b/core/scripts/js/check.js
@@ -1,39 +1,20 @@
 const fs = require('fs');
-const babel = require('babel-core');
 
 const log = require('./log');
+const transpile = require('./transpile');
 
 module.exports = (filePath) => {
   log(`'${filePath}' is being processed.`);
-  // Transform the file.
-  // Check process.env.NODE_ENV to see if we should create sourcemaps.
-  babel.transformFile(
-    filePath,
-    {
-      sourceMaps: process.env.NODE_ENV === 'development' ? 'inline' : false,
-      comments: false,
-      plugins: [
-        ['add-header-comment', {
-          'header': [
-            `DO NOT EDIT THIS FILE.\nAll changes should be applied to ${filePath}\nSee the following change record for more information,\nhttps://www.drupal.org/node/2873849\n@preserve`
-          ]
-        }]
-      ]
-    },
-    (err, result) => {
-      if (err) {
-        throw new Error(err);
-      }
+  transpile(filePath, function check(code) {
       const fileName = filePath.slice(0, -7);
       fs.readFile(`${fileName}.js`, function read(err, data) {
-        if (err) {
-          throw err;
-        }
-        if (result.code != data) {
-          log(`${fileName}.js`);
-          throw new Error(`'${filePath}' is not updated.`);
-        }
+          if (err) {
+              throw err;
+          }
+          if (code != data) {
+              log(`${fileName}.js`);
+              throw new Error(`'${filePath}' is not updated.`);
+          }
       });
-    }
-  );
+  });
 }
diff --git a/core/scripts/js/changeOrAdded.js b/core/scripts/js/transpile.js
similarity index 66%
copy from core/scripts/js/changeOrAdded.js
copy to core/scripts/js/transpile.js
index e6d1a96..b7e89ff 100644
--- a/core/scripts/js/changeOrAdded.js
+++ b/core/scripts/js/transpile.js
@@ -1,11 +1,7 @@
 const fs = require('fs');
 const babel = require('babel-core');
 
-const log = require('./log');
-
-module.exports = (filePath) => {
-  const moduleName = filePath.slice(0, -7);
-  log(`'${filePath}' is being processed.`);
+module.exports = (filePath, callback) => {
   // Transform the file.
   // Check process.env.NODE_ENV to see if we should create sourcemaps.
   babel.transformFile(
@@ -25,11 +21,7 @@ module.exports = (filePath) => {
       if (err) {
         throw new Error(err);
       }
-      const fileName = filePath.slice(0, -7);
-      // Write the result to the filesystem.
-      fs.writeFile(`${fileName}.js`, result.code, () => {
-        log(`'${filePath}' is finished.`);
-      });
+      callback(result.code);
     }
   );
 }