From 7adcfef4e721f17a0726f6c338a8a0903bddff03 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@gmail.com>
Date: Sun, 27 Mar 2022 16:22:15 +0000
Subject: [PATCH] Improve error message oriented from JS object

`JsValue.as_string` converts the value to String iff the value is a
String itself, so the error message always failovers to empty string.
`JsValue` impls `Debug` using `JSON.stringify`, and it gives better
description of the error.
---
 CHANGELOG.md           | 3 +++
 lib/api/src/js/trap.rs | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e400e2dd832..222e374608b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,9 @@ Looking for changes that affect our C API? See the [C API Changelog](lib/c-api/C
 
 ## **Unreleased**
 
+### Fixed
+- [#2829](https://github.com/wasmerio/wasmer/pull/2829) Improve error message oriented from JS object.
+
 ## 2.2.1 - 2022/03/15
 
 ### Fixed
diff --git a/lib/api/src/js/trap.rs b/lib/api/src/js/trap.rs
index 5bcde356c7e..88a8d6d0979 100644
--- a/lib/api/src/js/trap.rs
+++ b/lib/api/src/js/trap.rs
@@ -43,7 +43,7 @@ impl fmt::Display for RuntimeErrorSource {
         match self {
             Self::Generic(s) => write!(f, "{}", s),
             Self::User(s) => write!(f, "{}", s),
-            Self::Js(s) => write!(f, "{}", s.as_string().unwrap_or("".to_string())),
+            Self::Js(s) => write!(f, "{:?}", s),
         }
     }
 }