fix(semantic): analyze ReferenceFlags incorrectly when there are ne…

…sted `AssignmentTarget` (#5847)

close: #5801

crates/oxc_semantic/src/builder.rs

@@ -2009,7 +2009,15 @@ impl<'a> SemanticBuilder<'a> {
             | AstKind::PropertyKey(_) => {
                 self.current_reference_flags = ReferenceFlags::empty();
             }
-            AstKind::AssignmentTarget(_) => self.current_reference_flags -= ReferenceFlags::Write,
+            AstKind::AssignmentTarget(_) =>{
+                // Handle nested assignment targets like `({a: b} = obj)`
+                if !matches!(
+                    self.nodes.parent_kind(self.current_node_id),
+                    Some(AstKind::ObjectAssignmentTarget(_) | AstKind::ArrayAssignmentTarget(_))
+                ) {
+                    self.current_reference_flags -= ReferenceFlags::Write;
+                }
+            },
             AstKind::LabeledStatement(_) => self.unused_labels.mark_unused(self.current_node_id),
             _ => {}
         }

crates/oxc_semantic/tests/fixtures/oxc/assignment/nested-assignment.snap

@@ -0,0 +1,40 @@
+---
+source: crates/oxc_semantic/tests/main.rs
+input_file: crates/oxc_semantic/tests/fixtures/oxc/assignment/nested-assignment.ts
+---
+[
+  {
+    "children": [],
+    "flags": "ScopeFlags(StrictMode | Top)",
+    "id": 0,
+    "node": "Program",
+    "symbols": [
+      {
+        "flags": "SymbolFlags(BlockScopedVariable)",
+        "id": 0,
+        "name": "y",
+        "node": "VariableDeclarator(y)",
+        "references": [
+          {
+            "flags": "ReferenceFlags(Write)",
+            "id": 0,
+            "name": "y",
+            "node_id": 10
+          },
+          {
+            "flags": "ReferenceFlags(Write)",
+            "id": 1,
+            "name": "y",
+            "node_id": 23
+          },
+          {
+            "flags": "ReferenceFlags(Write)",
+            "id": 2,
+            "name": "y",
+            "node_id": 40
+          }
+        ]
+      }
+    ]
+  }
+]

crates/oxc_semantic/tests/fixtures/oxc/assignment/nested-assignment.ts

@@ -0,0 +1,4 @@
+let y;
+({ y } = {});
+({ 0: {}, y } = {0: {}});
+([[], y] = [[]])