feat: add no-new-wrappers

packages/autofix/lib/rules/no-new-wrappers.js

@@ -0,0 +1,25 @@
+/**
+ * @fileoverview Add fixer to rule no-new-wrappers.
+ * @author SukkaW <[email protected]>
+ */
+"use strict";
+
+const ruleComposer = require("eslint-rule-composer");
+const utils = require("../utils");
+
+const rule = utils.getFixableRule("no-new-wrappers", true);
+
+module.exports = ruleComposer.mapReports(
+    rule,
+    problem => {
+        if (
+            problem.node.type !== "NewExpression" || // ignore non new expression
+            problem.node.arguments.length === 0 // ignore 'const a = new String'
+        ) {
+            return problem;
+        }
+
+        problem.fix = fixer => fixer.removeRange([problem.node.range[0], problem.node.range[0] + 4]);
+        return problem;
+    }
+);

packages/autofix/tests/lib/rules/no-new-wrappers.js

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview Tests for rule no-new-native-nonconstructor
+ * @author SukkaW <[email protected]>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const rule = require("../../../lib/rules/no-new-wrappers.js");
+const RuleTester = require("../../rule-tester.js").RuleTester;
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+const ruleTester = new RuleTester();
+
+ruleTester.run("no-new-wrappers", rule, {
+    valid: [
+        "const text = String(someValue);",
+        "const num = Number(someValue);",
+        "const object = new MyString();"
+    ],
+    invalid: [
+        {
+            code: 'const stringObject = new String("Hello world");',
+            output: 'const stringObject = String("Hello world");',
+            errors: 1
+        },
+        {
+            code: "const numberObject = new Number(0x721);",
+            output: "const numberObject = Number(0x721);",
+            errors: 1
+        },
+        {
+            code: "const booleanObject = new Boolean(false);",
+            output: "const booleanObject = Boolean(false);",
+            errors: 1
+        },
+
+        // no auto fix
+        {
+            code: "const stringObject = new String",
+            output: null,
+            errors: 1
+        },
+        {
+            code: "const numberObject = new Number",
+            output: null,
+            errors: 1
+        },
+        {
+            code: "const booleanObject = new Boolean",
+            output: null,
+            errors: 1
+        }
+    ]
+});