diff -u b/core/scripts/build-javascript.sh b/core/scripts/build-javascript.sh
--- b/core/scripts/build-javascript.sh
+++ b/core/scripts/build-javascript.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-for js in `find core/{misc,modules,themes} -name '*.es6.js'`;
+for js in `find ./{misc,modules,themes} -name '*.es6.js'`;
 do
   ./node_modules/.bin/babel ${js} --out-file ${js%???????}.js --source-maps --no-comments
 done
diff -u b/core/scripts/javascript-babel-watcher.js b/core/scripts/javascript-babel-watcher.js
--- b/core/scripts/javascript-babel-watcher.js
+++ b/core/scripts/javascript-babel-watcher.js
@@ -2,27 +2,25 @@
 
 const fs = require('fs');
 const chokidar = require('chokidar');
-const babel = require('babel-core');
 const spawn = require('child_process').spawn;
 const path = require('path');
 
-
 // Logging human-readable timestamp.
 const log = function (message) {
   console.log(`[${new Date().toTimeString().slice(0, 8)}] ${message}`);
 };
 
-const fileMatch = 'core/**/*.es6.js';
-const watcher = chokidar.watch('core/**/*.es6.js', {
+const fileMatch = './**/*.es6.js';
+const watcher = chokidar.watch(fileMatch, {
   ignoreInitial: true
 });
 
-const changedOrAdded = function (filePath) {
+const changedOrAdded = (filePath) => {
   const fileName = filePath.slice(0, -7);
   const babelCli = path.join('./node_modules/.bin/', process.platform === 'win32' ? 'babel.cmd' : 'babel');
   const child = spawn(babelCli, [
-    "--source-maps",
-    "--no-comments",
+    '--source-maps',
+    '--no-comments',
     filePath,
     '--out-file', `${fileName}.js`
   ]);
@@ -39,7 +37,7 @@
 
 };
 
-const unlinkHandler = function (err) {
+const unlinkHandler = (err) => {
   if (err) {
     return log(err);
   }
diff -u b/core/scripts/migrate-js.sh b/core/scripts/migrate-js.sh
--- b/core/scripts/migrate-js.sh
+++ b/core/scripts/migrate-js.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-for js in `find core/{misc,modules,themes} -name '*.js'`;
+for js in `find ./{misc,modules,themes} -name '*.js'`;
 do
    mv ${js} ${js%???}.es6.js;
 done
reverted:
--- b/package.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "name": "Drupal",
-  "description": "Drupal is an open source content management platform powering millions of websites and applications.",
-  "license": "GPL-2.0",
-  "version": "8.3.0",
-  "private": true,
-  "scripts": {
-    "build:js": "./core/scripts/build-javascript.sh",
-    "watch:js": "node ./core/scripts/javascript-babel-watcher.js"
-  },
-  "devDependencies": {
-    "babel-cli": "6.16.0",
-    "babel-preset-es2015": "6.16.0",
-    "chokidar": "1.6.0"
-  },
-  "babel": {
-    "presets": [
-      "es2015"
-    ]
-  }
-}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "Drupal",
+  "description": "Drupal is an open source content management platform powering millions of websites and applications.",
+  "license": "GPL-2.0",
+  "version": "8.3.0",
+  "private": true,
+  "scripts": {
+    "build:js": "./scripts/build-javascript.sh",
+    "watch:js": "node ./scripts/javascript-babel-watcher.js"
+  },
+  "devDependencies": {
+    "babel-cli": "6.16.0",
+    "babel-preset-es2015": "6.16.0",
+    "chokidar": "1.6.0"
+  },
+  "babel": {
+    "presets": [
+      "es2015"
+    ]
+  }
+}