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fix : bug "$0 is not defined" with svelte:element and a single class with a function call #15396

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fix : bug "$0 is not defined" with svelte:element and a single class with a function call #15396

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4f63f9d
add spread to test
adiguba Feb 25, 2025
5d6bb2f
fix #15386
adiguba Feb 25, 2025
b07781d
Merge branch 'main' of https://github.com/sveltejs/svelte
adiguba Feb 26, 2025
6bc3416
fix #15392
adiguba Feb 26, 2025
311c8ff
test
adiguba Feb 26, 2025
ea0c942
changeset
adiguba Feb 26, 2025
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5 changes: 5 additions & 0 deletions .changeset/two-dragons-camp.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

fix : bug "$0 is not defined" on svelte:element with a function call on class
7 changes: 5 additions & 2 deletions packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js
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Original file line number Diff line number Diff line change
Expand Up @@ -83,9 +83,12 @@ export function SvelteElement(node, context) {
if (
attributes.length === 1 &&
attributes[0].type === 'Attribute' &&
attributes[0].name.toLowerCase() === 'class'
attributes[0].name.toLowerCase() === 'class' &&
attributes[0].value !== true &&
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I might be wrong but there should be a is_text_attrobute utility somewhere...can you check if that's the case and use that?

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Will change that in the morning

!Array.isArray(attributes[0].value) &&
attributes[0].value.metadata.expression.has_call === false
) {
// special case when there only a class attribute
// special case when there only a class attribute, without call expression
let { value, has_state } = build_attribute_value(
attributes[0].value,
context,
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60 changes: 60 additions & 0 deletions packages/svelte/tests/runtime-runes/samples/svelte-element-css-hash/_config.js
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import { flushSync } from 'svelte';
import { ok, test } from '../../test';

export default test({
html: `
<div></div>
<div class="red svelte-p153w3"></div>
<div></div>
<div class="red svelte-p153w3"></div>
<div class="blue svelte-p153w3"></div>
<div class="blue svelte-p153w3"></div>
`,

async test({ assert, target, component }) {
component.active = true;
flushSync();

assert.htmlEqual(
target.innerHTML,
`
<div></div>
<div class="red svelte-p153w3"></div>
<div class="active"></div>
<div class="red svelte-p153w3 active"></div>
<div class="blue svelte-p153w3"></div>
<div class="blue svelte-p153w3 active"></div>
`
);

component.tag = 'span';
flushSync();

assert.htmlEqual(
target.innerHTML,
`
<span></span>
<span class="red svelte-p153w3"></span>
<span class="active"></span>
<span class="red svelte-p153w3 active"></span>
<span class="blue svelte-p153w3"></span>
<span class="blue svelte-p153w3 active"></span>
`
);

component.active = false;
flushSync();

assert.htmlEqual(
target.innerHTML,
`
<span></span>
<span class="red svelte-p153w3"></span>
<span class=""></span>
<span class="red svelte-p153w3"></span>
<span class="blue svelte-p153w3"></span>
<span class="blue svelte-p153w3"></span>
`
);
}
});
20 changes: 20 additions & 0 deletions packages/svelte/tests/runtime-runes/samples/svelte-element-css-hash/main.svelte
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@@ -0,0 +1,20 @@
<script>
let { tag = "div", active = false } = $props();

function cn(classname) {
return classname;
}
</script>

<svelte:element this={tag}></svelte:element>
<svelte:element this={tag} class="red"></svelte:element>
<svelte:element this={tag} class:active={active}></svelte:element>
<svelte:element this={tag} class="red" class:active={active}></svelte:element>
<svelte:element this={tag} class={cn("blue")}></svelte:element>
<svelte:element this={tag} class={cn("blue")} class:active={active}></svelte:element>

<style>
.red {
color: red;
}
</style>