fix: make sure CSS is preserved during SSR with bindings (#15645)

dummdidumm · web-flow · commit 046145fdd7a0 · 2025-03-31T14:41:20.000-04:00
fixes #15543 No test because this is a one-liner in a stable part of the code-base, also it can only happen within legacy mode when using bindings which is not getting any new updates at this point
diff --git a/.changeset/smooth-mugs-grin.md b/.changeset/smooth-mugs-grin.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: make sure CSS is preserved during SSR with bindings
diff --git a/packages/svelte/src/internal/server/index.js b/packages/svelte/src/internal/server/index.js
@@ -49,6 +49,7 @@ export function copy_payload({ out, css, head, uid }) {
  */
 export function assign_payload(p1, p2) {
 	p1.out = p2.out;
+	p1.css = p2.css;
 	p1.head = p2.head;
 	p1.uid = p2.uid;
 }

Original file line number	Diff line number	Diff line change
`@@ -49,6 +49,7 @@ export function copy_payload({ out, css, head, uid }) {`
`49`	`49`	`*/`
`50`	`50`	`export function assign_payload(p1, p2) {`
`51`	`51`	`p1.out = p2.out;`
	`52`	`+ p1.css = p2.css;`
`52`	`53`	`p1.head = p2.head;`
`53`	`54`	`p1.uid = p2.uid;`
`54`	`55`	`}`