diff --git a/Gruntfile.coffee b/Gruntfile.coffee
deleted file mode 100644
index cd2e86f..0000000
--- a/Gruntfile.coffee
+++ /dev/null
@@ -1,71 +0,0 @@
-module.exports = (grunt) ->
-
-  grunt.initConfig
-
-    build:
-      client: 'src/**/*.js'
-
-    # JSHint options
-    # http://www.jshint.com/options/
-    jshint:
-      plugin:
-        files:
-          src: 'lib/**/*.js'
-        options:
-          # node
-          node: true,
-          strict: false
-
-      options:
-        quotmark: 'single'
-        bitwise: true
-        indent: 2
-        camelcase: true
-        strict: true
-        trailing: true
-        curly: true
-        eqeqeq: true
-        immed: true
-        latedef: true
-        newcap: true
-        noempty: true
-        unused: true
-        noarg: true
-        sub: true
-        undef: true
-        maxdepth: 4
-        maxlen: 100
-        globals: {}
-
-    simplemocha:
-      options:
-        ui: 'bdd'
-        reporter: 'dot'
-      unit:
-        src: [
-          'test/**/*.spec.js'
-        ]
-
-    'npm-contributors':
-      options:
-        commitMessage: 'chore: update contributors'
-
-    bump:
-      options:
-        commitMessage: 'chore: release v%VERSION%'
-        pushTo: 'upstream'
-
-  grunt.loadNpmTasks 'grunt-auto-release'
-  grunt.loadNpmTasks 'grunt-contrib-jshint'
-  grunt.loadNpmTasks 'grunt-bump'
-  grunt.loadNpmTasks 'grunt-npm'
-  grunt.loadNpmTasks 'grunt-simple-mocha'
-
-  grunt.registerTask 'default', ['jshint', 'test']
-  grunt.registerTask 'test', ['simplemocha:unit']
-  grunt.registerTask 'release', 'Bump and publish to NPM.', (type) ->
-    grunt.task.run [
-      'npm-contributors'
-      "bump:#{type||'patch'}"
-      'npm-publish'
-    ]
diff --git a/Gruntfile.js b/Gruntfile.js
new file mode 100644
index 0000000..bb5c7de
--- /dev/null
+++ b/Gruntfile.js
@@ -0,0 +1,70 @@
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs:
+ * https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+module.exports = function(grunt) {
+  grunt.initConfig({
+    build: {client: 'src/**/*.js'},
+
+    // JSHint options
+    // http://www.jshint.com/options/
+    jshint: {
+      plugin: {
+        files: {src: 'lib/**/*.js'},
+        options: {
+          // node
+          node: true,
+          strict: false
+        }
+      },
+      options: {
+        quotmark: 'single',
+        bitwise: true,
+        indent: 2,
+        camelcase: true,
+        strict: true,
+        trailing: true,
+        curly: true,
+        eqeqeq: true,
+        immed: true,
+        latedef: true,
+        newcap: true,
+        noempty: true,
+        unused: true,
+        noarg: true,
+        sub: true,
+        undef: true,
+        maxdepth: 4,
+        maxlen: 100,
+        globals: {}
+      }
+    },
+
+    simplemocha: {
+      options: {ui: 'bdd', reporter: 'dot'},
+      unit: {src: ['test/**/*.spec.js']}
+    },
+
+    'npm-contributors':
+        {options: {commitMessage: 'chore: update contributors'}},
+
+    bump: {
+      options: {commitMessage: 'chore: release v%VERSION%', pushTo: 'upstream'}
+    }
+  });
+
+  grunt.loadNpmTasks('grunt-auto-release');
+  grunt.loadNpmTasks('grunt-contrib-jshint');
+  grunt.loadNpmTasks('grunt-bump');
+  grunt.loadNpmTasks('grunt-npm');
+  grunt.loadNpmTasks('grunt-simple-mocha');
+
+  grunt.registerTask('default', ['jshint', 'test']);
+  grunt.registerTask('test', ['simplemocha:unit']);
+  return grunt.registerTask(
+      'release', 'Bump and publish to NPM.',
+      type => grunt.task.run(
+          ['npm-contributors', `bump:${type || 'patch'}`, 'npm-publish']));
+};