diff --git a/base.js b/base.js
index c9dba6e..e58d234 100644
--- a/base.js
+++ b/base.js
@@ -1,5 +1,8 @@
 module.exports = {
-    plugins: ['import'],
+    plugins: [
+        'import',
+        'chai-friendly',
+    ],
     rules: {
         quotes: ['error', 'single', {avoidEscape: true}],
         indent: [2, 4, {SwitchCase: 1}],
@@ -14,6 +17,8 @@ module.exports = {
         'no-multi-str': 0,
         'vars-on-top': 0,
         'no-unused-vars': [1, {args: 'after-used'}],
+        'no-unused-expressions': 0,
+        'chai-friendly/no-unused-expressions': 2,
         'no-use-before-define': [2, {functions: false}],
         'comma-dangle': [2, 'always-multiline'],
         'valid-jsdoc': [2, {
diff --git a/package.json b/package.json
index 166e9b9..5341eec 100644
--- a/package.json
+++ b/package.json
@@ -31,8 +31,9 @@
   "dependencies": {
     "eslint": "^2.13.1",
     "eslint-config-airbnb": "^9.0.1",
-    "eslint-plugin-jsx-a11y": "^1.2.0",
+    "eslint-plugin-chai-friendly": "^0.4.0",
     "eslint-plugin-import": "^1.7.0",
+    "eslint-plugin-jsx-a11y": "^1.2.0",
     "eslint-plugin-react": "^5.0.1"
   },
   "peerDependencies": {