Feature Request: updated `.fixture` diffing

The current output of assert.fixture(formatted,out) isn’t very intelligible to me currently:

I ended up just printing out the values side by side so I could actually see the difference in formatting between them…

Would it be possible to use a more advanced diffing output that looks similar to delta?

example:

It’d be nice if it was possible to just use delta, but it’s written in rust and I doubt they publish a WASM npm package.

[lukeed]

I’d consider highlighting the whitespace difference. I mean, to me, it’s pretty clear that one is more indented than the other, but highlighting could help in some cases perhaps.

Fwiw, jest has the same whitespace display as I do (no highlight) and some would say that’s the expectation/standard now.

Closing as duplicate of #1 as in general that ticket is about more control over diffing.

Thanks 😃

[lukeed]

I looked at relying on a delta installation already being installed on the host machine, but it wasn’t a good idea in terms of practicality. It would have also made uvu the only JS test runner to have a non-JS system peer dependency… and either at that point, or with a WASM integration, you start dancing around the “why use JS at all” question/territory.

That aside, the two screen shots you have are saying the exact same thing. The only real difference is that uvu’s is using text color while delta’s is highlighting the line with red/green backgrounds.

The other diff difference is that uvu detected missing new lines before the <style> tag & the other one doesn’t. My guess is that you/something compensated for that as part of creating the formatted-rename-me.astro file creation