diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000000..0277c4647c
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,9 @@
+{
+  "extends": "babel",
+  "rules": {
+    "max-len": 0
+  },
+  "env": {
+    "node": true
+  }
+}
diff --git a/.flowconfig b/.flowconfig
new file mode 100644
index 0000000000..1f7415a495
--- /dev/null
+++ b/.flowconfig
@@ -0,0 +1,16 @@
+[ignore]
+.*/packages/.*/lib
+.*/packages/.*/test
+
+[include]
+packages/*/src
+
+[libs]
+lib/file.js
+lib/parser.js
+lib/types.js
+
+[options]
+strip_root=true
+suppress_comment= \\(.\\|\n\\)*\\$FlowFixMe
+suppress_comment= \\(.\\|\n\\)*\\$FlowIssue
diff --git a/Makefile b/Makefile
index c73eb96001..11cd42fd41 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ watch: clean
 	./node_modules/.bin/gulp watch
 
 lint:
-	./node_modules/.bin/kcheck
+	./node_modules/.bin/eslint packages/*/src
 
 clean: test-clean
 	rm -rf packages/*/lib
@@ -45,6 +45,7 @@ test-cov: clean
 test-ci:
 	make lint
 	NODE_ENV=test make bootstrap
+	# if ./node_modules/.bin/semver `npm --version` -r ">=3.3.0"; then ./node_modules/.bin/flow check; fi
 	./scripts/test-cov.sh
 	cat ./coverage/coverage.json | ./node_modules/codecov.io/bin/codecov.io.js
 
diff --git a/package.json b/package.json
index 19e1709f05..d19df4c4a3 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   "devDependencies": {
     "async": "^1.5.0",
     "babel-core": "^6.13.2",
+    "babel-eslint": "^6.1.2",
     "babel-plugin-transform-class-properties": "^6.6.0",
     "babel-plugin-transform-flow-strip-types": "^6.3.13",
     "babel-plugin-transform-runtime": "^6.3.13",
@@ -20,8 +21,11 @@
     "chalk": "1.1.1",
     "codecov.io": "^0.1.6",
     "derequire": "^2.0.2",
-    "es5-shim": "^4.1.7",
-    "fs-readdir-recursive": "^0.1.2",
+    "eslint": "^2.13.1",
+    "eslint-config-babel": "^1.0.1",
+    "eslint-plugin-babel": "^3.3.0",
+    "eslint-plugin-flow-vars": "^0.5.0",
+    "flow-bin": "^0.31.1",
     "gulp": "^3.9.0",
     "gulp-babel": "^6.0.0",
     "gulp-newer": "^1.0.0",
@@ -29,18 +33,11 @@
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.5",
     "istanbul": "^0.4.5",
-    "kcheck": "^2.0.0",
     "lerna": "2.0.0-beta.23",
     "lerna-changelog": "^0.2.0",
     "lodash": "^4.2.0",
-    "matcha": "^0.6.0",
-    "mkdirp": "^0.5.1",
     "mocha": "^3.0.0",
     "output-file-sync": "^1.1.1",
-    "pad": "^1.0.0",
-    "path-exists": "^1.0.0",
-    "progress": "^1.1.8",
-    "readline-sync": "^1.2.19",
     "rimraf": "^2.4.3",
     "semver": "^5.0.0",
     "shelljs": "^0.7.4",