use arrow fns

Author: Will Binns-Smith

lib/rules/no-unused-state.js

@@ -64,7 +64,7 @@ module.exports = {
     schema: []
   },
 
-  create: Components.detect(function(context, components, utils) {
+  create: Components.detect((context, components, utils) => {
     // Non-null when we are inside a React component ClassDeclaration and we have
     // not yet encountered any use of this.state which we have chosen not to
     // analyze. If we encounter any such usage (like this.state being spread as

tests/lib/rules/no-unused-state.js

@@ -18,11 +18,9 @@ const parserOptions = {
 const eslintTester = new RuleTester({parserOptions});
 
 function getErrorMessages(unusedFields) {
-  return unusedFields.map(function(field) {
-    return {
-      message: `Unused state field: '${field}'`
-    };
-  });
+  return unusedFields.map(field => ({
+    message: `Unused state field: '${field}'`
+  }));
 }
 
 eslintTester.run('no-unused-state', rule, {