feat: support svelte 5.16.0 class value

[calvo-jp]

Closes #

📝 Description

In Svelte 5.16.0, the class attribute accepts objects and arrays as values using clsx under the hood. This PR adds support for this feature. (code taken from clsx)

⛳️ Current behavior (updates)

Input:

mergeProps(
  {class: {class1: true}},
  {class: ['class2', 'class3', null, undefined]},
  {class: 'class4'},
  {class: {class5: false, class6: true}},
)

Output:

{ class: 'class3' }

🚀 New behavior

Input:

mergeProps(
  { class: null },
  { class: undefined },
  { class: ["class1", "class2", null, undefined] },
  { class: "class3" },
  { class: { class4: false, class5: true } },
)

Output:

{ class: 'class1 class2 class3 class5' }

💣 Is this a breaking change (Yes/No):

No

📝 Additional Information

[changeset-bot]

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Latest commit: ee61e65

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[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
zag-solid	✅ Ready (Inspect)	Visit Preview	Dec 29, 2024 10:03am
zag-svelte	✅ Ready (Inspect)	Visit Preview	Dec 29, 2024 10:03am
zag-vue	✅ Ready (Inspect)	Visit Preview	Dec 29, 2024 10:03am
zag-website	✅ Ready (Inspect)	Visit Preview	Dec 29, 2024 10:03am

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[anubra266]

@calvo-jp It's probably better to make this change in the svelte adapter

https://github.com/chakra-ui/zag/blob/main/packages/frameworks/svelte/src/merge-props.ts

[calvo-jp]

@calvo-jp It's probably better to make this change in the svelte adapter

https://github.com/chakra-ui/zag/blob/main/packages/frameworks/svelte/src/merge-props.ts

Hi @anubra266. Will update my PR once I get back. Thank you!

[segunadebayo]

After thinking deeply about this, we don't want to include this logic in zag.js since we don't use classNames in our components or logic.

Please include this in your userland or library code instead.

Thanks for opening this.