`path.format` should accept a file extension without a leading dot

[sindresorhus]

What is the problem this feature will solve?

Some (user-land) APIs return a file extension without the dot.

What is the feature you are proposing to solve the problem?

It would be nice if path.format() would handle file extension without the leading dot.

Current behavior:

path.format({name: 'x', ext: 'png'});
//=> 'xpng'

Wanted behavior:

path.format({name: 'x', ext: 'png'});
//=> 'x.png'

The current behavior makes no sense and should at minimum have caused an error.

So what I'm requested is that if the ext is missing a leading dot, it would be added.

What alternatives have you considered?

No response

[tniessen]

The current behavior makes no sense and should at minimum have caused an error.

I tend to agree, but some application might rely on the current behavior (see #44349 (comment)).