diff --git a/packages/extension/gulpfile.coffee b/packages/extension/gulpfile.coffee
deleted file mode 100644
index 91fd9b08ad99..000000000000
--- a/packages/extension/gulpfile.coffee
+++ /dev/null
@@ -1,75 +0,0 @@
-fs         = require("fs-extra")
-pkg        = require("./package.json")
-gulp       = require("gulp")
-clean      = require("gulp-clean")
-rename     = require("gulp-rename")
-runSeq     = require("run-sequence")
-source     = require("vinyl-source-stream")
-Promise    = require("bluebird")
-coffeeify  = require("coffeeify")
-browserify = require("browserify")
-icons      = require("@cypress/icons")
-
-gulp.task "clean", ->
-  gulp.src("dist")
-  .pipe(clean())
-
-gulp.task "manifest", (done) ->
-  gulp.src("app/manifest.json")
-  .pipe(gulp.dest("dist"))
-  .on "end", ->
-    fs.readJson "dist/manifest.json", (err, json) ->
-      json.version = pkg.version
-      fs.writeJson "dist/manifest.json", json, {spaces: 2}, done
-  null
-
-gulp.task "backup", ->
-  gulp.src("dist/background.js")
-  .pipe(rename("background_src.js"))
-  .pipe(gulp.dest("dist"))
-
-gulp.task "background", ->
-  browserify({
-    entries: "app/background.coffee"
-    transform: coffeeify
-  })
-  .bundle()
-  .pipe(source("background.js"))
-  .pipe(gulp.dest("dist"))
-
-gulp.task "html", ->
-  gulp.src("app/**/*.html")
-  .pipe(gulp.dest("dist"))
-
-gulp.task "css", ->
-  gulp.src("app/**/*.css")
-  .pipe(gulp.dest("dist"))
-
-gulp.task "icons", ->
-  gulp.src([
-    icons.getPathToIcon("icon_16x16.png")
-    icons.getPathToIcon("icon_19x19.png")
-    icons.getPathToIcon("icon_38x38.png")
-    icons.getPathToIcon("icon_48x48.png")
-    icons.getPathToIcon("icon_128x128.png")
-  ])
-  .pipe(gulp.dest("dist/icons"))
-
-gulp.task "logos", ->
-  gulp.src([
-    icons.getPathToLogo("cypress-bw.png")
-  ])
-  .pipe(gulp.dest("dist/logos"))
-
-gulp.task "watch", ["build"], ->
-  gulp.watch("app/**/*", ["build"])
-
-gulp.task "build", ->
-  runSeq "clean", [
-    "icons"
-    "logos"
-    "manifest"
-    "background"
-    "html"
-    "css"
-  ]
diff --git a/packages/extension/gulpfile.js b/packages/extension/gulpfile.js
new file mode 100644
index 000000000000..cd544e64b699
--- /dev/null
+++ b/packages/extension/gulpfile.js
@@ -0,0 +1,100 @@
+/* eslint-disable
+    @cypress/dev/no-return-before,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const fs = require('fs-extra')
+const pkg = require('./package.json')
+const gulp = require('gulp')
+const clean = require('gulp-clean')
+const rename = require('gulp-rename')
+const runSeq = require('run-sequence')
+const source = require('vinyl-source-stream')
+const Promise = require('bluebird')
+const coffeeify = require('coffeeify')
+const browserify = require('browserify')
+const icons = require('@cypress/icons')
+
+gulp.task('clean', () => {
+  return gulp.src('dist')
+  .pipe(clean())
+})
+
+gulp.task('manifest', (done) => {
+  gulp.src('app/manifest.json')
+  .pipe(gulp.dest('dist'))
+  .on('end', () => {
+    return fs.readJson('dist/manifest.json', (err, json) => {
+      json.version = pkg.version
+
+      return fs.writeJson('dist/manifest.json', json, { spaces: 2 }, done)
+    })
+  })
+
+  return null
+})
+
+gulp.task('backup', () => {
+  return gulp.src('dist/background.js')
+  .pipe(rename('background_src.js'))
+  .pipe(gulp.dest('dist'))
+})
+
+gulp.task('background', () => {
+  return browserify({
+    entries: 'app/background.coffee',
+    transform: coffeeify,
+  })
+  .bundle()
+  .pipe(source('background.js'))
+  .pipe(gulp.dest('dist'))
+})
+
+gulp.task('html', () => {
+  return gulp.src('app/**/*.html')
+  .pipe(gulp.dest('dist'))
+})
+
+gulp.task('css', () => {
+  return gulp.src('app/**/*.css')
+  .pipe(gulp.dest('dist'))
+})
+
+gulp.task('icons', () => {
+  return gulp.src([
+    icons.getPathToIcon('icon_16x16.png'),
+    icons.getPathToIcon('icon_19x19.png'),
+    icons.getPathToIcon('icon_38x38.png'),
+    icons.getPathToIcon('icon_48x48.png'),
+    icons.getPathToIcon('icon_128x128.png'),
+  ])
+  .pipe(gulp.dest('dist/icons'))
+})
+
+gulp.task('logos', () => {
+  return gulp.src([
+    icons.getPathToLogo('cypress-bw.png'),
+  ])
+  .pipe(gulp.dest('dist/logos'))
+})
+
+gulp.task('watch', ['build'], () => {
+  return gulp.watch('app/**/*', ['build'])
+})
+
+gulp.task('build', () => {
+  return runSeq('clean', [
+    'icons',
+    'logos',
+    'manifest',
+    'background',
+    'html',
+    'css',
+  ])
+})