Fix: Don't require commas after rest properties (fixes #7297) (#7298)

lib/rules/comma-dangle.js

@@ -13,14 +13,17 @@ const lodash = require("lodash");
 
 /**
  * Checks whether or not a trailing comma is allowed in a given node.
- * `ArrayPattern` which has `RestElement` disallows it.
+ * `ArrayPattern` which has `RestElement` or `ObjectPattern` which has `RestProperty` disallows it.
  *
  * @param {ASTNode} node - A node to check.
  * @param {ASTNode} lastItem - The node of the last element in the given node.
  * @returns {boolean} `true` if a trailing comma is allowed.
  */
 function isTrailingCommaAllowed(node, lastItem) {
-    return node.type !== "ArrayPattern" || lastItem.type !== "RestElement";
+    return !(
+        (node.type === "ArrayPattern" && lastItem.type === "RestElement") ||
+        (node.type === "ObjectPattern" && (lastItem.type === "RestProperty" || lastItem.type === "ExperimentalRestProperty"))
+    );
 }
 
 //------------------------------------------------------------------------------

tests/lib/rules/comma-dangle.js

@@ -116,6 +116,13 @@ ruleTester.run("comma-dangle", rule, {
             options: ["always"]
         },
 
+        // https://github.com/eslint/eslint/issues/7297
+        {
+            code: "var {foo, ...bar} = baz",
+            parserOptions: { ecmaVersion: 8, ecmaFeatures: { experimentalObjectRestSpread: true } },
+            options: ["always"]
+        },
+
         // https://github.com/eslint/eslint/issues/3794
         {
             code: "import {foo,} from 'foo';",