From 80b79773a97af52c81834aa91592f7ff4bc05f3d Mon Sep 17 00:00:00 2001
From: Ronen Amiel <ronen.amiel@gmail.com>
Date: Mon, 17 Feb 2025 23:32:39 +0200
Subject: [PATCH 1/2] check private variables for being deprecated

---
 .../eslint-plugin/src/rules/no-deprecated.ts  |  2 ++
 .../tests/rules/no-deprecated.test.ts         | 31 +++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/packages/eslint-plugin/src/rules/no-deprecated.ts b/packages/eslint-plugin/src/rules/no-deprecated.ts
index 8833c05b4c82..aca03f347821 100644
--- a/packages/eslint-plugin/src/rules/no-deprecated.ts
+++ b/packages/eslint-plugin/src/rules/no-deprecated.ts
@@ -17,6 +17,7 @@ import {
 type IdentifierLike =
   | TSESTree.Identifier
   | TSESTree.JSXIdentifier
+  | TSESTree.PrivateIdentifier
   | TSESTree.Super;
 
 type MessageIds = 'deprecated' | 'deprecatedWithReason';
@@ -400,6 +401,7 @@ export default createRule<Options, MessageIds>({
           checkIdentifier(node);
         }
       },
+      PrivateIdentifier: checkIdentifier,
       Super: checkIdentifier,
     };
   },
diff --git a/packages/eslint-plugin/tests/rules/no-deprecated.test.ts b/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
index 1d5745fe0b56..6dfa2fb68ca6 100644
--- a/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
+++ b/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
@@ -363,6 +363,15 @@ exists('/foo');
       declare const test: string;
       const bar = { test };
     `,
+    `
+      class A {
+        #b = () => {};
+
+        c() {
+          this.#b();
+        }
+      }
+    `,
   ],
   invalid: [
     {
@@ -2862,5 +2871,27 @@ class B extends A {
         },
       ],
     },
+    {
+      code: `
+        class A {
+          /** @deprecated */
+          #b = () => {};
+
+          c() {
+            this.#b();
+          }
+        }
+      `,
+      errors: [
+        {
+          column: 18,
+          data: { name: 'b' },
+          endColumn: 20,
+          endLine: 7,
+          line: 7,
+          messageId: 'deprecated',
+        },
+      ],
+    },
   ],
 });

From d75a9db8a321cea31d2238d22266583edd04afb4 Mon Sep 17 00:00:00 2001
From: Ronen Amiel <ronen.amiel@gmail.com>
Date: Mon, 17 Feb 2025 23:38:41 +0200
Subject: [PATCH 2/2] report the node name correctly

---
 packages/eslint-plugin/src/rules/no-deprecated.ts  | 14 +++++++++++++-
 .../tests/rules/no-deprecated.test.ts              |  2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/packages/eslint-plugin/src/rules/no-deprecated.ts b/packages/eslint-plugin/src/rules/no-deprecated.ts
index aca03f347821..94d7a5ed7262 100644
--- a/packages/eslint-plugin/src/rules/no-deprecated.ts
+++ b/packages/eslint-plugin/src/rules/no-deprecated.ts
@@ -378,7 +378,7 @@ export default createRule<Options, MessageIds>({
         return;
       }
 
-      const name = node.type === AST_NODE_TYPES.Super ? 'super' : node.name;
+      const name = getReportedNodeName(node);
 
       context.report({
         ...(reason
@@ -406,3 +406,15 @@ export default createRule<Options, MessageIds>({
     };
   },
 });
+
+function getReportedNodeName(node: IdentifierLike): string {
+  if (node.type === AST_NODE_TYPES.Super) {
+    return 'super';
+  }
+
+  if (node.type === AST_NODE_TYPES.PrivateIdentifier) {
+    return `#${node.name}`;
+  }
+
+  return node.name;
+}
diff --git a/packages/eslint-plugin/tests/rules/no-deprecated.test.ts b/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
index 6dfa2fb68ca6..6469c0fe5c23 100644
--- a/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
+++ b/packages/eslint-plugin/tests/rules/no-deprecated.test.ts
@@ -2885,7 +2885,7 @@ class B extends A {
       errors: [
         {
           column: 18,
-          data: { name: 'b' },
+          data: { name: '#b' },
           endColumn: 20,
           endLine: 7,
           line: 7,