Set trailing-comma: all in Prettier

[hyunbinseo]

Is there a reason why "trailingComma": "none" is set in the template?

1. Prettier changed its default value from es5 to all in v3.0.0
2. Trailing comma makes diffs and pull requests easier:

Quote from the Bun 1.2 changelog:

That's why buns new text lock file is a JsonC file which is JSON with support for comments and trailing commas. This makes it much easier to view diffs and pull requests and trailing commas make it much less likely to cause merge conflicts.

[Conduitry]

I'm personally very much pro trailing comma. I know some members of the team are against them for reasons I cannot understand, I don't know where the numbers sit on how many are for and against.

[benmccann]

I'm in the anti trailing comma camp. It looks nicer and consistently works in all file formats. I didn't have anything to do with it being set to none and don't know how it originally was decided, but I guess that must means there's at least some other folks out there who prefer not to have it

[manuel3108]

Looks like this was taken over from create-svelte .

Additionally it does look like most of the repos in this org seem to have trailing-comma: none

• kit
• svelte
• same goes for the cli

Personally I don't have any strong preference over any of this.