diff --git a/.changeset/odd-taxis-retire.md b/.changeset/odd-taxis-retire.md
new file mode 100644
index 0000000000..b60a450c3a
--- /dev/null
+++ b/.changeset/odd-taxis-retire.md
@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: disallow exporting props, derived and reassigned state from within components