Add back RequestInit.priority property

[SevenOutman]

Fix microsoft/TypeScript#54472

As of today (2023-06), RequestInit.priority (MDN) already has considerable range of support according to caniuse.com

Additional Info

The generated RequestInit.priority doesn't have a descriptive comment. I found that comments for other RequestInit members are located in inputfiles/idl/fetch.commentmap.json, the README informs that this file should be updated with npm run fetch but this script seems missing now. How could I add the comments?

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @saschanaz - if they write a comment saying "LGTM" then it will be merged.

[SevenOutman]

@microsoft-github-policy-service agree

[HolgerJeromin]

As of today (2023-06), RequestInit.priority (MDN) already has considerable range of support according to caniuse.com

No. This is all one engine (blink).

https://github.com/microsoft/TypeScript-DOM-lib-generator#when-the-type-is-missing

[max-carroll-sky]

LGTM

[davecardwell]

Could this be reconsidered for merging please?

• It is standardized in the fetch spec: https://fetch.spec.whatwg.org/#request-priority
• It’s live in Chromium-based browsers
• Safari have implemented it in the Technology Preview version (initially behind flag, enabled by default)
• Firefox have it ticketed as part of their Fetch Priority work

cc/ @saschanaz @HolgerJeromin

[HolgerJeromin]

Firefox have it ticketed as part of their Fetch Priority work

I know (for me) important firefox tickets which are 10+ years old :-)
I am pretty sure this will be merged when Safari or Firefox get this stable.

[HolgerJeromin]

#1654 added fetchprio for image because of
mdn/browser-compat-data#21267
Perhaps we should merge this very pr now.

[saschanaz]

I filed mdn/browser-compat-data#21421 as I can confirm that Safari 17.2 has this. LGTM.

[github-actions]

Sorry @saschanaz, this PR has merge conflicts. They'll need to be fixed before this can be merged.

[saschanaz]

(But this PR has conflict)

[SevenOutman]

(But this PR has conflict)

I'll have them resolved this week.

[SevenOutman]

@saschanaz Conflicts resolved.

[saschanaz]

Lgtm

[github-actions]

Merging because @saschanaz is a code-owner of all the changes - thanks!