# Intent to ship: "JS BigInt to I64 integration" WebAssembly proposal
This feature allows I64 values in WebAssembly to be exported to JavaScript as a BigInt value, or imported from JS from a BigInt. With this proposal implemented, all four value types in the WebAssembly MVP can be passed through the Wasm<->JS boundary, allowing for easier interoperation between the languages. This intent-to-ship is on behalf of Asumu Takikawa (in cc), who was experiencing some mail moderation issues. While they are being fixed, we wanted to get this intent-to-ship out there. ## Tracking bugs Implementation: https://bugzilla.mozilla.org/show_bug.cgi?id=1608770 Shipping: https://bugzilla.mozilla.org/show_bug.cgi?id=1631702 ## Standard https://github.com/WebAssembly/JS-BigInt-integration https://webassembly.github.io/JS-BigInt-integration/js-api/index.html The proposal very recently entered "phase 4" in the WebAssembly standardization process: https://github.com/WebAssembly/meetings/blob/master/2020/CG-05-12.md ## Platform coverage All ## Devtools support N/A. BigInts are displayed fine in the debugger. ## Restricted to secure contexts No. (Not a worry as no additional capabilities granted.) ## Is this feature enabled by default in sandboxed iframes? Yes. (Not a worry as no additional capabilities granted.) ## Estimated or target release 78 (soft freeze 28 May, train leaving 1 June) ## Support in other browser / JS engines Chrome / V8 implements the proposal. Staged in September 2019, not shipped yet: https://bugs.chromium.org/p/v8/issues/detail?id=7741 Support in emscripten: https://github.com/emscripten-core/emscripten/pull/10860 ## Upstream test coverage There are good tests in the proposal repository, which are not merged upstream into WPT yet but likely will be in the near future: https://github.com/WebAssembly/JS-BigInt-integration/tree/master/test ## Where to send your bugs Asumu Takikawa (:asumu). _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
