fix: prevent invalid BigInt calls from blowing up at compile time

Rich-Harris · Rich-Harris · commit b25ab1864916 · 2025-05-12T16:36:38.000-04:00
diff --git a/.changeset/little-worms-wonder.md b/.changeset/little-worms-wonder.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: prevent invalid BigInt calls from blowing up at compile time
diff --git a/packages/svelte/src/compiler/phases/scope.js b/packages/svelte/src/compiler/phases/scope.js
@@ -23,7 +23,7 @@ export const STRING = Symbol('string');
 
 /** @type {Record<string, [type: NUMBER | STRING | UNKNOWN, fn?: Function]>} */
 const globals = {
-	BigInt: [NUMBER, BigInt],
+	BigInt: [NUMBER],
 	'Math.min': [NUMBER, Math.min],
 	'Math.max': [NUMBER, Math.max],
 	'Math.random': [NUMBER],
diff --git a/packages/svelte/tests/runtime-runes/samples/bigint-invalid/_config.js b/packages/svelte/tests/runtime-runes/samples/bigint-invalid/_config.js
@@ -0,0 +1,7 @@
+import { test } from '../../test';
+
+export default test({
+	// check that this is a runtime error, not a compile time error
+	// caused by over-eager partial-evaluation
+	error: 'Cannot convert invalid to a BigInt'
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/bigint-invalid/main.svelte b/packages/svelte/tests/runtime-runes/samples/bigint-invalid/main.svelte
@@ -0,0 +1,5 @@
+<script>
+	var invalid = BigInt('invalid');
+</script>
+
+<h1>{invalid}</h1>

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'svelte': patch
 +---
++
 +fix: prevent invalid BigInt calls from blowing up at compile time