diff -u b/core/package.json b/core/package.json
--- b/core/package.json
+++ b/core/package.json
@@ -10,7 +10,8 @@
   "devDependencies": {
     "babel-cli": "6.16.0",
     "babel-preset-es2015": "6.16.0",
-    "chokidar": "1.6.0"
+    "chokidar": "1.6.0",
+    "glob": "^7.1.1"
   },
   "babel": {
     "presets": [
diff -u b/core/scripts/js/babel-es6-compile.js b/core/scripts/js/babel-es6-compile.js
--- b/core/scripts/js/babel-es6-compile.js
+++ b/core/scripts/js/babel-es6-compile.js
@@ -12,7 +12,7 @@
 const fs = require('fs');
 const path = require('path');
 const babel = require('babel-core');
-const chokidar = require('chokidar');
+const glob = require('glob');
 
 // Logging human-readable timestamp.
 const log = function (message) {
@@ -24,12 +24,6 @@
   return code + '\n\n//# sourceMappingURL=' + path.basename(loc);
 }
 
-const fileMatch = './**/*.es6.js';
-const watcher = chokidar.watch(fileMatch, {
-  ignoreInitial: false,
-  ignored: 'node_modules/**'
-});
-
 const babelOptions = {
   sourceMaps: true,
   comments: false
@@ -45,15 +39,18 @@
-    fs.writeFileSync(mapLoc, JSON.stringify(result.map));
+    fs.writeFile(mapLoc, JSON.stringify(result.map));
 
-    fs.writeFileSync(`${fileName}.js`, result.code);
+    fs.writeFile(`${fileName}.js`, result.code);
 
     log(`'${filePath}' has been compiled.`);
   });
 };
 
-watcher
-  .on('add', filePath => changedOrAdded(filePath))
-  .on('change', filePath => changedOrAdded(filePath))
-  .on('ready', () => {
-    log('Finished!');
-    process.exit(0);
-  });
+const fileMatch = './**/*.es6.js';
+const globOptions = { ignore: 'node_modules/**' };
+const processFiles = (error, filePaths) => {
+  if (error) {
+    process.exitCode = 1;
+  }
+  filePaths.forEach(changedOrAdded);
+};
+glob(fileMatch, globOptions, processFiles);
+process.exitCode = 0;