Require support for AsyncContext

[Ms2ger]

This is pending progress in TC39.

• At least two implementers are interested (and none opposed):
  • …
  • …
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): …
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): …
• MDN issue is filed: …

(See WHATWG Working Mode: Changes for more details.)

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/web-messaging.html ( diff )
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[annevk]

Perhaps this should have a corresponding issue to discuss details? At least when I had a conversation about this feature with @littledan it sounded like there might be a bunch of subtle platform integration points and not a one-size-fits-all type of solution.

cc @yoavweiss

[Ms2ger]

#12152