From ce239bcb3a9eb21885075be7ffe76c657c47c762 Mon Sep 17 00:00:00 2001
From: Felix Angelov <felangelov@gmail.com>
Date: Fri, 17 May 2024 19:14:50 -0500
Subject: [PATCH] feat: throw if a default constructor already exists

---
 lib/src/constructable_macro.dart | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/src/constructable_macro.dart b/lib/src/constructable_macro.dart
index a29e4e2..94a60eb 100644
--- a/lib/src/constructable_macro.dart
+++ b/lib/src/constructable_macro.dart
@@ -33,6 +33,11 @@ macro class Constructable implements ClassDeclarationsMacro {
     ClassDeclaration clazz,
     MemberDeclarationBuilder builder,
   ) async {
+    final constructors = await builder.constructorsOf(clazz);
+    if (constructors.any((c) => c.identifier.name == '')) {
+      throw ArgumentError('A default constructor already exists.');
+    }
+
     final fieldDeclarations = await builder.fieldsOf(clazz);
     final fields = await Future.wait(
       fieldDeclarations.map(