diff --git a/.npmrc b/.npmrc
index 0a904865..2b5dd677 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1 +1,7 @@
 reporter=append-only
+
+# Pin pnpm's default isolated linker. A global `node-linker=hoisted` flattens the
+# tree and gives svelte, @sveltejs/kit and @sveltejs/acorn-typescript separate
+# `acorn` copies, which breaks `Parser.extend(tsPlugin())` — every `<script lang="ts">`
+# then fails to parse with "Unexpected token" during `vite build`.
+node-linker=isolated