From 778f8daa057b39b9538ebaa04f7c382bd95482b2 Mon Sep 17 00:00:00 2001
From: Matthieu Monsch <1216372+mtth@users.noreply.github.com>
Date: Fri, 11 Nov 2022 18:59:04 -0800
Subject: [PATCH] Decorate invalid default error message (#415)

---
 lib/types.js       | 14 +++++++++++++-
 package.json       |  2 +-
 test/test_types.js |  2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/lib/types.js b/lib/types.js
index 8070de0a..f4d644e6 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -2828,7 +2828,19 @@ function Field(schema, opts) {
     // allowed instead).
     // http://apache-avro.679487.n3.nabble.com/field-union-default-in-Java-td1175327.html
     var type = this.type;
-    var val = type._copy(value, {coerce: 2, wrap: 2});
+    var val;
+    try {
+      val = type._copy(value, {coerce: 2, wrap: 2});
+    } catch (err) {
+      var msg = f('incompatible field default %j (%s)', value, err.message);
+      if (Type.isType(type, 'union')) {
+        msg += f(
+          ', union defaults must match the first branch\'s type (%j)',
+          type.types[0]
+        );
+      }
+      throw new Error(msg);
+    }
     // The clone call above will throw an error if the default is invalid.
     if (isPrimitive(type.typeName) && type.typeName !== 'bytes') {
       // These are immutable.
diff --git a/package.json b/package.json
index 0609a5da..5c2a56da 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "avsc",
-  "version": "5.7.6",
+  "version": "5.7.7",
   "description": "Avro for JavaScript",
   "homepage": "https://github.com/mtth/avsc",
   "keywords": [
diff --git a/test/test_types.js b/test/test_types.js
index cd470b7c..60ee218d 100644
--- a/test/test_types.js
+++ b/test/test_types.js
@@ -1585,7 +1585,7 @@ suite('types', function () {
           name: 'Person',
           fields: [{name: 'name', type: ['null', 'string'], 'default': ''}]
         });
-      });
+      }, /incompatible.*first branch/);
     });
 
     test('record default', function () {