[BUG] Windows WebKit doesn't have WebAssembly

[myobie]

Context:

• Playwright Version: 1.1.1
• Operating System: Windows
• Node version: 14.4.0
• Browser: WebKit
• Extra: Process running inside GitHub Actions; code running in a ServiceWorker context.

Code Snippet

(async function () {
  const response = await fetch(url)
  const bytes = await response.arrayBuffer()
  const module = await WebAssembly.compile(bytes)
  return module
})()

Describe the bug

Throws an Error with the message Can't find variable: WebAssembly. Code works on Linux WebKit and macOS WebKit – WebAssembly is found.

[aslushnikov]

@myobie Yes, there's no webassembly indeed. We have a summary table on what's in there and what's not for every platform:

https://github.com/microsoft/playwright/blob/master/docs/development/webkit.md

I don't think this is something that'll change in near future. +cc @yury-s to make sure I understand it right.

[yury-s]

WebAssembly is currently disabled in WebKit Windows port upstream. I don't think anyone is actively working on enabling it there so it will likely be missing in WebKit Windows in the near future.

[myobie]

Gah, I missed that feature table. Thanks for the link and info. 🙇

[ericoporto]

WebAssembly is currently disabled in WebKit Windows port upstream.

Is this still the state in 2023?

[trusktr]

Is this still the state in 2023?

Yes indeed, I just tried. WebAssembly is still missing in Windows Webkit.

[fujii]

upstream WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=222315
Contributions are welcome.

[ericoporto]

Erh, curious, should playwright's WebKit in macOS have WebAssembly?

[iangrunert]

WebAssembly is now enabled on the Windows port for WebKit: WebKit/WebKit#18184

Note that this is just the low level interpreter, neither of the JIT tiers are enabled yet. This means it'll run significantly slower than other platforms for now, until the BBQ and / or OMG JIT tiers are enabled.

[DrMueller]

@iangrunert Sorry for the question, but how do I get the newest version with Windows WASM WebKit to work? According to https://playwright.dev/dotnet/docs/browsers, PlayWright.NET decides, which version of WebKit to use, isn't it?

[DrMueller]

@iangrunert Sorry for the question, but how do I get the newest version with Windows WASM WebKit to work? According to https://playwright.dev/dotnet/docs/browsers, PlayWright.NET decides, which version of WebKit to use, isn't it? Does your comment above mean, that it is technically ready but not yet released?

[iangrunert]

@DrMueller Unfortunately JIT was disabled on the Windows port in May due to https://bugs.webkit.org/show_bug.cgi?id=273854, and JIT is (currently) required in order to generate entry thunks to use the WebAssembly interpreter.

I'm currently working on getting JIT + WebAssembly re-enabled, I can comment on this thread when that happens.

[DrMueller]

@iangrunert Thank you for the status update, yes it would be grat if you could leave a comment so i get pinged, when this is supposed to work.