Add the type of Intl.DurationFormat to the lib.

[developer-bandi]

Add initial type for prototype

Fixes #60608

[developer-bandi]

@microsoft-github-policy-service agree

[developer-bandi]

I referred to the two links below, but lint does not work properly. Can I get help?

-https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md#get-started -https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md#helpful-tasks

[jakebailey]

Your CI is passing linting, so I'm not sure what you mean.

The section you are looking for to fix tests is https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md#managing-the-baselines

For formatting, run npx dprint fmt and commit the result.

[Wiktor102]

Is this PR being worked on? It seems to be pretty important, given that for almost 4 months now, this API has had the "Baseline Newly available" status.

[Standard8]

It looks like there's just one change remaining to complete this. Would it be possible that it could happen soon, or should someone take over (or maybe a maintainer can change the branch?)?