refactor(web): migrate browser code to TypeScript

1 files changed, 4 insertions, 0 deletions

diff --git a/web/frontend/dom.ts b/web/frontend/dom.ts
new file mode 100644
index 0000000..a3a1765
--- /dev/null
+++ b/web/frontend/dom.ts
@@ -0,0 +1,4 @@
+export const requireElement = <T extends Element>(element: T | null, description: string): T => {
+  if (!element) throw new Error(`Missing ${description} element`);
+  return element;
+};