New: "no-proto" (#36)

lib/rules/no-proto.js

@@ -0,0 +1,22 @@
+/**
+ * @fileoverview Add fixer to rule no-proto.
+ * @author Pig Fang <g-plane@hotmail.com>
+ */
+"use strict";
+
+const ruleComposer = require("eslint-rule-composer");
+const utils = require("../utils");
+
+const rule = utils.getFixableRule("no-proto", false);
+
+module.exports = ruleComposer.mapReports(
+    rule,
+    (problem, { sourceCode }) => {
+        problem.fix = fixer => {
+            const { node } = problem;
+
+            return fixer.replaceText(node, `Object.getPrototypeOf(${sourceCode.getText(node.object)})`);
+        };
+        return problem;
+    }
+);

readme.md

@@ -41,6 +41,7 @@ Name | ✔️ | 🛠 | Description
 [no-eq-null](https://eslint.org/docs/rules/no-eq-null) |  | 🛠 | disallow `null` comparisons without type-checking operators
 [no-new-symbol](https://eslint.org/docs/rules/no-new-symbol) |  | 🛠 | disallow `new` operators with the `Symbol` object
 [no-plusplus](https://eslint.org/docs/rules/no-plusplus) | ✔️ | 🛠 | disallow the unary operators `++` and `--`
+[no-proto](https://eslint.org/docs/rules/no-proto) |  | 🛠 | disallow the use of the `__proto__` property
 [no-prototype-builtins](https://eslint.org/docs/rules/no-prototype-builtins) |  | 🛠 | disallow calling some `Object.prototype` methods directly on objects
 [no-useless-concat](https://eslint.org/docs/rules/no-useless-concat) |  | 🛠 | disallow unnecessary concatenation of literals or template literals
 [prefer-spread](https://eslint.org/docs/rules/prefer-spread) |  | 🛠 | require spread operators instead of `.apply()`

tests/lib/rules/no-proto.js

@@ -0,0 +1,37 @@
+/**
+ * @fileoverview Tests for rule no-proto.
+ * @author Pig Fang <g-plane@hotmail.com>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const rule = require("../../../lib/rules/no-proto");
+const RuleTester = require("eslint").RuleTester;
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+const ruleTester = new RuleTester();
+const errors = [{ type: "MemberExpression" }];
+
+ruleTester.run("no-proto", rule, {
+    valid: [
+        "Object.getPrototypeOf(obj)"
+    ],
+    invalid: [
+        {
+            code: "obj.__proto__",
+            output: "Object.getPrototypeOf(obj)",
+            errors
+        },
+        {
+            code: "obj['__proto__']",
+            output: "Object.getPrototypeOf(obj)",
+            errors
+        }
+    ]
+});