[eslint config] [base] enable no-multi-assign

packages/eslint-config-airbnb-base/rules/style.js

@@ -233,8 +233,7 @@ module.exports = {
 
     // disallow use of chained assignment expressions
     // http://eslint.org/docs/rules/no-multi-assign
-    // TODO: enable, semver-minor
-    'no-multi-assign': ['off'],
+    'no-multi-assign': ['error'],
 
     // disallow multiple empty lines and only one newline at the end
     'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 1 }],