diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..84cef4f
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,28 @@
+{
+  "parserOptions": {
+    "ecmaVersion": 5
+  },
+  "extends": "eslint:recommended",
+  "env": {
+    "commonjs": true
+  },
+  "rules": {
+    "strict": [2, "global"],
+    "block-scoped-var": 2,
+    "consistent-return": 2,
+    "eqeqeq": [2, "smart"],
+    "guard-for-in": 2,
+    "no-caller": 2,
+    "no-extend-native": 2,
+    "no-loop-func": 2,
+    "no-new": 2,
+    "no-param-reassign": 2,
+    "no-return-assign": 2,
+    "no-unused-expressions": 2,
+    "no-use-before-define": 2,
+    "radix": [2, "always"],
+    "indent": [2, 2],
+    "quotes": [2, "double"],
+    "semi": [2, "always"]
+  }
+}
diff --git a/.gitignore b/.gitignore
index e306283..7050558 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 /.*
 !/.gitignore
-!/.jscsrc
-!/.jshintrc
+!/.eslintrc.json
 !/.travis.yml
 /bower_components/
 /node_modules/
diff --git a/.jscsrc b/.jscsrc
deleted file mode 100644
index 2561ce9..0000000
--- a/.jscsrc
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  "preset": "grunt",
-  "disallowSpacesInFunctionExpression": null,
-  "requireSpacesInFunctionExpression": {
-    "beforeOpeningRoundBrace": true,
-    "beforeOpeningCurlyBrace": true
-  },
-  "disallowSpacesInAnonymousFunctionExpression": null,
-  "requireSpacesInAnonymousFunctionExpression": {
-    "beforeOpeningRoundBrace": true,
-    "beforeOpeningCurlyBrace": true
-  },
-  "disallowSpacesInsideObjectBrackets": null,
-  "requireSpacesInsideObjectBrackets": "all",
-  "validateQuoteMarks": "\"",
-  "requireCurlyBraces": null
-}
diff --git a/.jshintrc b/.jshintrc
deleted file mode 100644
index 620d8d7..0000000
--- a/.jshintrc
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "bitwise": true,
-  "eqeqeq": true,
-  "forin": true,
-  "freeze": true,
-  "funcscope": true,
-  "futurehostile": true,
-  "strict": "global",
-  "latedef": true,
-  "maxparams": 1,
-  "noarg": true,
-  "nocomma": true,
-  "nonew": true,
-  "notypeof": true,
-  "singleGroups": true,
-  "undef": true,
-  "unused": true,
-  "eqnull": true,
-  "predef": ["exports"]
-}
diff --git a/.travis.yml b/.travis.yml
index 3455305..4cbd5fd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 dist: trusty
 sudo: required
-node_js: 6
+node_js: stable
 env:
   - PATH=$HOME/purescript:$PATH
 install:
diff --git a/bower.json b/bower.json
index 1ac48f3..10f0105 100644
--- a/bower.json
+++ b/bower.json
@@ -17,12 +17,12 @@
     "package.json"
   ],
   "dependencies": {
-    "purescript-either": "^2.0.0",
-    "purescript-maybe": "^2.0.0",
-    "purescript-partial": "^1.1.2"
+    "purescript-either": "^3.0.0",
+    "purescript-maybe": "^3.0.0",
+    "purescript-partial": "^1.2.0"
   },
   "devDependencies": {
-    "purescript-assert": "^2.0.0",
-    "purescript-console": "^2.0.0"
+    "purescript-assert": "^3.0.0",
+    "purescript-console": "^3.0.0"
   }
 }
diff --git a/package.json b/package.json
index 8cdcd96..132cefc 100644
--- a/package.json
+++ b/package.json
@@ -2,14 +2,13 @@
   "private": true,
   "scripts": {
     "clean": "rimraf output && rimraf .pulp-cache",
-    "build": "jshint src && jscs src && pulp build --censor-lib --strict",
+    "build": "eslint src && pulp build -- --censor-lib --strict",
     "test": "pulp test"
   },
   "devDependencies": {
-    "jscs": "^2.8.0",
-    "jshint": "^2.9.1",
-    "pulp": "^9.0.1",
-    "purescript-psa": "^0.3.9",
-    "rimraf": "^2.5.0"
+    "eslint": "^3.17.1",
+    "pulp": "^10.0.4",
+    "purescript-psa": "^0.5.0-rc.1",
+    "rimraf": "^2.6.1"
   }
 }
diff --git a/src/Data/String.js b/src/Data/String.js
index fd42223..634d91a 100644
--- a/src/Data/String.js
+++ b/src/Data/String.js
@@ -133,7 +133,8 @@ exports.drop = function (n) {
 
 exports.count = function (p) {
   return function (s) {
-    for (var i = 0; i < s.length && p(s.charAt(i)); i++); {}
+    var i = 0;
+    while (i < s.length && p(s.charAt(i))) i++;
     return i;
   };
 };
diff --git a/src/Data/String/Regex.purs b/src/Data/String/Regex.purs
index f1e3716..d60b9ee 100644
--- a/src/Data/String/Regex.purs
+++ b/src/Data/String/Regex.purs
@@ -24,7 +24,7 @@ import Data.String (Pattern(..), contains)
 import Data.String.Regex.Flags (RegexFlags(..), RegexFlagsRec)
 
 -- | Wraps Javascript `RegExp` objects.
-foreign import data Regex :: *
+foreign import data Regex :: Type
 
 foreign import showRegex' :: Regex -> String
 
diff --git a/test/Test/Data/Char.purs b/test/Test/Data/Char.purs
index ad35c43..ee86573 100644
--- a/test/Test/Data/Char.purs
+++ b/test/Test/Data/Char.purs
@@ -1,6 +1,6 @@
 module Test.Data.Char (testChar) where
 
-import Prelude (Unit, (==), ($), bind)
+import Prelude (Unit, (==), ($), discard)
 
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
diff --git a/test/Test/Data/String.purs b/test/Test/Data/String.purs
index e706ca1..bc58ee1 100644
--- a/test/Test/Data/String.purs
+++ b/test/Test/Data/String.purs
@@ -1,6 +1,6 @@
 module Test.Data.String (testString) where
 
-import Prelude (Unit, Ordering(..), (==), ($), bind, negate, not, (/=), (&&))
+import Prelude (Unit, Ordering(..), (==), ($), discard, negate, not, (/=), (&&))
 
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
diff --git a/test/Test/Data/String/CaseInsensitive.purs b/test/Test/Data/String/CaseInsensitive.purs
index e47b4a9..9bd4530 100644
--- a/test/Test/Data/String/CaseInsensitive.purs
+++ b/test/Test/Data/String/CaseInsensitive.purs
@@ -1,6 +1,6 @@
 module Test.Data.String.CaseInsensitive (testCaseInsensitiveString) where
 
-import Prelude (Unit, (==), ($), bind, compare, Ordering(..))
+import Prelude (Unit, (==), ($), discard, compare, Ordering(..))
 
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
diff --git a/test/Test/Data/String/Regex.purs b/test/Test/Data/String/Regex.purs
index 8b9fc3f..6228b91 100644
--- a/test/Test/Data/String/Regex.purs
+++ b/test/Test/Data/String/Regex.purs
@@ -1,6 +1,6 @@
 module Test.Data.String.Regex (testStringRegex) where
 
-import Prelude (Unit, ($), (<>), bind, (==), not)
+import Prelude (Unit, ($), (<>), discard, (==), not)
 
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
diff --git a/test/Test/Data/String/Unsafe.purs b/test/Test/Data/String/Unsafe.purs
index 10d3934..bd2924d 100644
--- a/test/Test/Data/String/Unsafe.purs
+++ b/test/Test/Data/String/Unsafe.purs
@@ -1,6 +1,6 @@
 module Test.Data.String.Unsafe (testStringUnsafe) where
 
-import Prelude (Unit, (==), ($), bind)
+import Prelude (Unit, (==), ($), discard)
 
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)