fix: Resolve TypeScript errors

Signed-off-by: Hermes Agent <hermes@nosuchhost>

client/node_modules/lib0/conditions.js

@@ -0,0 +1,13 @@
+/**
+ * Often used conditions.
+ *
+ * @module conditions
+ */
+
+/**
+ * @template T
+ * @param {T|null|undefined} v
+ * @return {T|null}
+ */
+/* c8 ignore next */
+export const undefinedToNull = v => v === undefined ? null : v