diff --git a/examples/preact/component/script.mts b/examples/preact/component/script.mts
index 024c5c61..deaf61a4 100644
--- a/examples/preact/component/script.mts
+++ b/examples/preact/component/script.mts
@@ -1 +1,3 @@
-document.getElementById('replace')!.textContent = 'Hello from JavaScript!';
+const replace = document.getElementById('replace');
+if (!replace) throw new Error('No `#replace` element.');
+replace.textContent = 'Hello from JavaScript!';
diff --git a/packages/rules_prerender/scripts.mts b/packages/rules_prerender/scripts.mts
index a6d282ae..f54d6d72 100644
--- a/packages/rules_prerender/scripts.mts
+++ b/packages/rules_prerender/scripts.mts
@@ -18,8 +18,8 @@ export function includeScript(filePath: string, meta: ImportMeta): string {
  * wrapping. This is useful for templating engines which don't have easy "parse
  * HTML into safe type" utilities.
  */
-export function includeScriptAnnotation(
-        filePath: string, meta: ImportMeta): string {
+export function includeScriptAnnotation(filePath: string, meta: ImportMeta):
+        string {
     if (!filePath.startsWith('.')) {
         throw new Error(`Only relative imports are supported and must start with \`./\` or \`../\`: "${filePath}".`);
     }