diff --git a/.travis.yml b/.travis.yml
index 2e54686..080ebb2 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,6 @@
 language: node_js
 sudo: false
 node_js:
-  # - "0.6"
-  # - "0.8"
-  # - "0.10"
-  # - "0.11"
   - "4"
   - "5"
   - "6"
diff --git a/index.js b/index.js
index 2ffc659..8340b98 100755
--- a/index.js
+++ b/index.js
@@ -17,6 +17,7 @@ const REGEX_LEADING_EXCAPED_HASH = /^\\#/
 const SLASH = '/'
 const KEY_IGNORE = typeof Symbol !== 'undefined'
   ? Symbol.for('node-ignore')
+  /* istanbul ignore next */
   : 'node-ignore'
 
 
diff --git a/install.sh b/install.sh
deleted file mode 100644
index c143db2..0000000
--- a/install.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-# babel-preset-es2015 fails to install on nodejs < 0.10
-npm install babel-cli babel-preset-es2015 --no-save
diff --git a/package.json b/package.json
index 7dedee5..0172fa1 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,10 @@
     "index.d.ts"
   ],
   "scripts": {
-    "test": "istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- --reporter spec ./test/ignore.js && codecov",
-    "test-no-cov": "./node_modules/.bin/mocha --reporter spec ./test/ignore.js",
+    "prepublish": "npm run build",
+    "build": "babel -o ignore.js index.js",
+    "test": "npm run build && istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- --reporter spec ./test/ignore.js && codecov",
+    "test-no-cov": "npm run build && ./node_modules/.bin/mocha --reporter spec ./test/ignore.js",
     "cov-report": "istanbul report"
   },
   "repository": {
@@ -37,6 +39,8 @@
     "url": "https://github.com/kaelzhang/node-ignore/issues"
   },
   "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-preset-es2015": "^6.24.1",
     "chai": "~1.7.2",
     "codecov": "^1.0.1",
     "istanbul": "^0.4.5",
diff --git a/test.sh b/test.sh
deleted file mode 100644
index 4d7283e..0000000
--- a/test.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-export PATH=$PATH:./node_modules/.bin/
-export IGNORE_TEST_WIN32=
-
-abort() {
-  printf "\n\x1B[31mError: $@\x1B[0m\n\n"
-  exit 1
-}
-
-rm -rf ./coverage
-
-type babel && babel -o ignore.js index.js || abort 'warn: babel failed'
-
-npm test