BigInt to i64 conversion (WebAssembly)Baseline · Widely available
Integer values pass bidirectionally between JavaScript and WebAssembly, converted to i64 values in WebAssembly or BigInt values in JavaScript.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Apr 26, 2021. Widely available since Oct 26, 2023.
Browser support
DesktopChrome
1–84Not supported
85+Supportedsince Aug 25, 2020
Current: 155Edge
12–84Not supported
85+Supportedsince Aug 27, 2020
Current: 154Firefox
1–77Not supported
78+Supportedsince Jun 30, 2020
Current: 157Safari
1–14Not supported
14.1+Supportedsince Apr 26, 2021
Current: 27MobileChrome Android
18–84Not supported
85+Supportedsince Aug 25, 2020
Current: 155Firefox Android
4–68Not supported
79+Supportedsince Jul 28, 2020
Current: 157Safari iOS
1–14Not supported
14.5+Supportedsince Apr 26, 2021
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
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.