fix(transformer/legacy-decorator): use write-only reference flag for computed key temp var assignment

babu-ch · babu-ch · commit 24a72d7bca4f · 2026-03-16T23:14:47.000+09:00
diff --git a/crates/oxc_transformer/src/decorator/legacy/mod.rs b/crates/oxc_transformer/src/decorator/legacy/mod.rs
@@ -1112,7 +1112,7 @@ impl<'a> LegacyDecorator<'a> {
                 // Create a unique binding for the computed property key, and insert it outside of the class
                 let binding = VarDeclarationsStore::create_uid_var_based_on_node(key, ctx);
                 let operator = AssignmentOperator::Assign;
-                let left = binding.create_read_write_target(ctx);
+                let left = binding.create_write_target(ctx);
                 let right = key.to_expression_mut().take_in(ctx.ast);
                 let key_expr = ctx.ast.expression_assignment(SPAN, operator, left, right);
                 *key = PropertyKey::from(key_expr);
diff --git a/tasks/transform_conformance/tests/legacy-decorators/test/fixtures/oxc/computed-key-property-decorator-with-initializer/input.ts b/tasks/transform_conformance/tests/legacy-decorators/test/fixtures/oxc/computed-key-property-decorator-with-initializer/input.ts
@@ -0,0 +1,8 @@
+const FIELD_NAME = "myField";
+
+function dec(target: any, key: string) {}
+
+class MyModel {
+	@dec
+	[FIELD_NAME] = "value";
+}
diff --git a/tasks/transform_conformance/tests/legacy-decorators/test/fixtures/oxc/computed-key-property-decorator-with-initializer/output.js b/tasks/transform_conformance/tests/legacy-decorators/test/fixtures/oxc/computed-key-property-decorator-with-initializer/output.js
@@ -0,0 +1,7 @@
+var _FIELD_NAME;
+const FIELD_NAME = "myField";
+function dec(target, key) {}
+class MyModel {
+  [_FIELD_NAME = FIELD_NAME] = "value";
+}
+babelHelpers.decorate([dec], MyModel.prototype, _FIELD_NAME, void 0);
