fix: create fewer deriveds for concatenated strings

Rich-Harris · Rich-Harris · commit e2350578caeb · 2025-01-16T17:36:59.000-05:00
diff --git a/.changeset/rich-donkeys-wink.md b/.changeset/rich-donkeys-wink.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: create fewer deriveds for concatenated strings
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
@@ -47,7 +47,7 @@ export function build_template_chunk(values, visit, state) {
 				quasi.value.cooked += node.expression.value + '';
 			}
 		} else {
-			if (contains_multiple_call_expression) {
+			if (node.metadata.expression.has_call && contains_multiple_call_expression) {
 				const id = b.id(state.scope.generate('stringified_text'));
 				state.init.push(
 					b.const(

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'svelte': patch
 +---
++
 +fix: create fewer deriveds for concatenated strings
Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ export function build_template_chunk(values, visit, state) {`
`47`	`47`	`quasi.value.cooked += node.expression.value + '';`
`48`	`48`	`}`
`49`	`49`	`} else {`
`50`		`- if (contains_multiple_call_expression) {`
	`50`	`+ if (node.metadata.expression.has_call && contains_multiple_call_expression) {`
`51`	`51`	`const id = b.id(state.scope.generate('stringified_text'));`
`52`	`52`	`state.init.push(`
`53`	`53`	`b.const(`