Update prettier, change print width to 120, and enable dangling commas for functions

[julienw]

Fixes #370

I didn't regenerate all workloads (yet). Please do not land this just yet, this PR is here so that we can decide about #370.

I made separate commits so that we can easily see the effect of each action:

1. update Prettier
2. add dangling commas to functions
3. change printWidth to 120

[rniwa]

At this point, I'd rather not take a huge PR like this into the repo right before the release even if it should not have any real impact on performance in theory.

[rniwa]

Adding v3.1 label to match the label on #370

[julienw]

At this point, I'd rather not take a huge PR like this into the repo right before the release even if it should not have any real impact on performance in theory.

fully agreed, this was definitely meant for after the release. Thanks for adding the label.

[camillobruni]

Loooking good. I guess we can redo the formatting now that we've released?

[julienw]

Loooking good. I guess we can redo the formatting now that we've released?

yeah, I was waiting to see if there was some interest before doing more work :-)

[camillobruni]

I'd definitely prefer some width-limit, especially for the html files.

[julienw]

I rebased and refreshed all affected benchmarks.

On my Linux:

Firefox Before:

Firefox After:

Chrome Before:

Chrome After:

(I don't have a Mac so I can't try Safari)

[rniwa]

What's up with these DOCTYPE change? These don't seem desirable.

[julienw]

This comes from the prettier update to v3 (see https://prettier.io/blog/2023/07/05/3.0.0.html#html). There's also no option to disable this behavior.

The doctype is case insensitive so IMO it's not important. I'm glad somebody else has an opinion about it so that I don't need to have one.

[rniwa]

Why are we making all these other changes to prettier?

[julienw]

You can find out more if you look at the individual commits, as there's one commit for each logical change.

In short a lot of them are the defaults (see 3rd commit), except printWidth and trailingComma which are the changes by this PR.

Changing trailingComma is beneficial because it makes better diffs: with the old style, there's no trailing comma, and therefore when function parameters or array properties or object properties are added or removed, the previous line also shows up in a diff. If it has a trailing comma, then it isn't changed.