coderef

Exception references with exnref (WebAssembly)Baseline · Newly available

When caught, an exception is reified into an exception reference, a value of the new type exnref.

Works in the latest version of every major browser, but older devices may not support it yet. Baseline since May 29, 2025.

How to use ↓Compare browsers

Browser support

DesktopChrome
1–136Not supported
137+Supportedsince May 27, 2025
Current: 155
Edge
12–136Not supported
137+Supportedsince May 29, 2025
Current: 154
Firefox
1–130Not supported
131+Supportedsince Oct 1, 2024
Current: 157
Safari
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27
MobileChrome Android
18–136Not supported
137+Supportedsince May 27, 2025
Current: 155
Firefox Android
4–130Not supported
131+Supportedsince Oct 1, 2024
Current: 157
Safari iOS
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27

How to use

Every current browser supports this, but it only became Baseline on May 29, 2025. Use it as a progressive enhancement, or keep a fallback if you support older devices.

Example

Full syntax and examples are on MDN — see the links below.

Feature detection

There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.

Specification