[building-webpack] Consider removing async function transformation

[LarsDenBakker]

In our webpack setup we use the fast-async plugin to compile async functions. However that makes it always kick in. Based on: https://caniuse.com/#search=async%20function any browser which supports type="module" supports async functions.

Probably we can remove this transform, but we should properly test this.

[thepassle]

I tested this by removing:
@open-wc/building-webpack/default-config.js:131

'module:fast-async',

and adding:

async asyncFunction() {
  await new Promise(resolve => setTimeout(resolve, 500));
}
asyncFunction();

to my demo app.

I tested on the following browsers (on browserstack):

• firefox 62 and up
• chrome 69 and up
• opera 55 and up
• edge 15 and up
• safari 10.1

where everything works.

Bundlesize savings:

with fast-async
27.9 kb

without fast-async
27.4 kb

[LarsDenBakker]

Thats great, thanks for testing! Performance is probably better too.

[thepassle]

Very slightly, yeah

[stale]

Hi everyone! Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. Unfortunately, we don't have time to get to every issue. We are always open to contributions so please send us a pull request if you would like to help. Inactive issues will be closed after 30 days. Thanks!

[stale]

Hey there, it's me again! I am going close this issue to help our maintainers focus on the current development roadmap instead. If the issue mentioned is still a concern, please open a new ticket and mention this old one. Cheers and thanks for using Open Web Components!