The new `singleAttributePerLine` option not working

[aradalvand]

Prettier added a singleAttributePerLine option in version 2.6.0, which applies to any kind of markup including the HTML in .svelte files, but it seems like enabling it has no effect when formatting Svelte files:

Untitled.Project.mp4

[aradalvand]

@dummdidumm Shouldn't this be given the "bug" label as opposed to "enhancement"? Because it's not asking for a new feature, it's just that an already existing option in Prettier isn't functioning.

I'm not familiar with the inner workings of this plugin but doesn't it just pass through the options to Prettier and use its HTML formatter under the hood? If so, then it's kind of strange that this doesn't work already. Am I right?

Thanks.

[dummdidumm]

It's an enhancement because we don't use the HTML/JSX parser of Prettier which supports this now, we have to create our own. So it's an enhancement because it's a new option which wasn't added support for yet.

[aradalvand]

we don't use the HTML/JSX parser of Prettier

Don't mean to annoy you but may I ask why? That sounds like a strange design decision.

[dummdidumm]

Because the HTML parser would parse things like {#if ... or {foo} as a regular string, and get confused at things like <div on:click={() => ..}