diff --git a/‎packages/eslint-plugin/tests/rules/no-unused-vars/no-unused-vars.test.ts‎
Lines changed: 63 additions & 0 deletions b/‎packages/eslint-plugin/tests/rules/no-unused-vars/no-unused-vars.test.ts‎
Lines changed: 63 additions & 0 deletions
diff --git a/‎packages/scope-manager/src/referencer/ClassVisitor.ts‎
Lines changed: 4 additions & 1 deletion b/‎packages/scope-manager/src/referencer/ClassVisitor.ts‎
Lines changed: 4 additions & 1 deletion
diff --git a/‎packages/scope-manager/tests/fixtures/decorators/parameter-property.ts.shot‎
Lines changed: 6 additions & 5 deletions b/‎packages/scope-manager/tests/fixtures/decorators/parameter-property.ts.shot‎
Lines changed: 6 additions & 5 deletions
diff --git a/‎packages/scope-manager/tests/fixtures/decorators/parameter.ts‎
Lines changed: 8 additions & 1 deletion b/‎packages/scope-manager/tests/fixtures/decorators/parameter.ts‎
Lines changed: 8 additions & 1 deletion
diff --git a/‎packages/scope-manager/tests/fixtures/decorators/parameter.ts.shot‎
Lines changed: 43 additions & 7 deletions b/‎packages/scope-manager/tests/fixtures/decorators/parameter.ts.shot‎
Lines changed: 43 additions & 7 deletions
@@ -1116,6 +1116,58 @@ export const x = _Foo;
         },
       ],
     },
+    {
+      code: `
+const command = (): ParameterDecorator => {
+  return () => {};
+};
+
+export class Foo {
+  bar(@command() command: string) {}
+}
+      `,
+      errors: [
+        {
+          data: {
+            action: 'defined',
+            additional: '',
+            varName: 'command',
+          },
+          line: 7,
+          messageId: 'unusedVar',
+        },
+      ],
+    },
+    {
+      code: `
+declare const deco: () => ParameterDecorator;
+
+export class Foo {
+  bar(@deco() deco, @deco() param) {}
+}
+      `,
+      errors: [
+        {
+          column: 15,
+          data: {
+            action: 'defined',
+            additional: '',
+            varName: 'deco',
+          },
+          line: 5,
+          messageId: 'unusedVar',
+        },
+        {
+          data: {
+            action: 'defined',
+            additional: '',
+            varName: 'param',
+          },
+          line: 5,
+          messageId: 'unusedVar',
+        },
+      ],
+    },
   ],
 
   valid: [
@@ -2274,5 +2326,16 @@ export enum Foo {
       `,
       options: [{ reportUsedIgnorePattern: true, varsIgnorePattern: '_' }],
     },
+    `
+const command = (): ParameterDecorator => {
+  return () => {};
+};
+
+export class Foo {
+  bar(@command() command: string) {
+    console.log(command);
+  }
+}
+    `,
   ],
 });
@@ -115,6 +115,10 @@ class ClassVisitor extends Visitor {
       this.#referencer.scopeManager.nestFunctionExpressionNameScope(node);
     }
 
+    node.params.forEach(param => {
+      param.decorators.forEach(d => this.visit(d));
+    });
+
     // Consider this function is in the MethodDefinition.
     this.#referencer.scopeManager.nestFunctionScope(node, true);
 
@@ -205,7 +209,6 @@ class ClassVisitor extends Visitor {
         { processRightHandNodes: true },
       );
       this.visitFunctionParameterTypeAnnotation(param);
-      param.decorators.forEach(d => this.visit(d));
     }
 
     this.visitType(node.returnType);
 
@@ -1,4 +1,11 @@
 function decorator() {}
 class A {
-  foo(@decorator a, @decorator [b], @decorator { c }, @decorator d = 1) {}
+  foo(
+    @decorator a,
+    @decorator [b],
+    @decorator { c },
+    @decorator d = 1,
+    @decorator decorator,
+    @d decorator,
+  ) {}
 }