tools: add eslint rule for __proto__: null in object

.eslintrc.js

@@ -316,6 +316,7 @@ module.exports = {
     'node-core/no-unescaped-regexp-dot': 'error',
     'node-core/no-duplicate-requires': 'error',
     'node-core/prefer-proto': 'error',
+    'node-core/set-proto-to-null-in-object': 'error',
   },
   globals: {
     ByteLengthQueuingStrategy: 'readable',

tools/eslint-rules/set-proto-to-null-in-object.js

@@ -0,0 +1,31 @@
+'use strict';
+
+module.exports = {
+  meta: {
+    messages: {
+      error: 'Add `__proto__: null` to object',
+    },
+  },
+  create: function(context) {
+    return {
+      ObjectExpression(node) {
+        const properties = node.properties;
+        let hasProto = false;
+
+        for (const property of properties) {
+          if (property.key && property.key.name === '__proto__') {
+            hasProto = true;
+            break;
+          }
+        }
+
+        if (!hasProto) {
+          context.report({
+            node,
+            message: 'Every object must have __proto__: null',
+          });
+        }
+      },
+    };
+  },
+};