chore: run eslint on JS files at the root of the directory

gulpfile.js

@@ -22,7 +22,6 @@
  * SOFTWARE.
  */
 
-const fs = require('fs');
 const path = require('path');
 const gulp = require('gulp');
 const jasmine = require('gulp-jasmine');
@@ -61,6 +60,7 @@ gulp.task('build', ['clean', 'lint'], () => {
 
 gulp.task('lint', () => {
   const src = [
+    path.join(ROOT, '*.js'),
     path.join(SRC, '**', '*.js'),
     path.join(TEST, '**', '*.js'),
   ];