Fix: prefer-destructuring PrivateIdentifier false positive (refs #14857) (#14897)

mdjermanovic · web-flow · commit cbc43daad2ea · 2021-08-09T17:49:24.000-07:00
diff --git a/docs/rules/prefer-destructuring.md b/docs/rules/prefer-destructuring.md
@@ -62,6 +62,17 @@ Examples of **correct** code when `enforceForRenamedProperties` is enabled:
 var { bar: foo } = object;
 ```
 
+Examples of additional **correct** code when `enforceForRenamedProperties` is enabled:
+
+```javascript
+class C {
+    #x;
+    foo() {
+        const bar = this.#x; // private identifiers are not allowed in destructuring
+    }
+}
+```
+
 An example configuration, with the defaults `array` and `object` filled in, looks like this:
 
 ```json
diff --git a/lib/rules/prefer-destructuring.js b/lib/rules/prefer-destructuring.js
@@ -221,7 +221,11 @@ module.exports = {
          * @returns {void}
          */
         function performCheck(leftNode, rightNode, reportNode) {
-            if (rightNode.type !== "MemberExpression" || rightNode.object.type === "Super") {
+            if (
+                rightNode.type !== "MemberExpression" ||
+                rightNode.object.type === "Super" ||
+                rightNode.property.type === "PrivateIdentifier"
+            ) {
                 return;
             }
 
diff --git a/tests/lib/rules/prefer-destructuring.js b/tests/lib/rules/prefer-destructuring.js
@@ -16,7 +16,7 @@ const rule = require("../../../lib/rules/prefer-destructuring"),
 // Tests
 //------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 2020 } });
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 2022 } });
 
 ruleTester.run("prefer-destructuring", rule, {
     valid: [
@@ -157,7 +157,40 @@ ruleTester.run("prefer-destructuring", rule, {
 
         // Optional chaining
         "var foo = array?.[0];", // because the fixed code can throw TypeError.
-        "var foo = object?.foo;"
+        "var foo = object?.foo;",
+
+        // Private identifiers
+        "class C { #x; foo() { const x = this.#x; } }",
+        "class C { #x; foo() { x = this.#x; } }",
+        "class C { #x; foo(a) { x = a.#x; } }",
+        {
+            code: "class C { #x; foo() { const x = this.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo() { const y = this.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo() { x = this.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo() { y = this.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo(a) { x = a.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo(a) { y = a.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        },
+        {
+            code: "class C { #x; foo() { x = this.a.#x; } }",
+            options: [{ array: true, object: true }, { enforceForRenamedProperties: true }]
+        }
     ],
 
     invalid: [
