fixed warnings from eslint

src/lib/errors.ts

@@ -0,0 +1,7 @@
+/**
+ * Extracts a readable message from an unknown thrown value, since anything
+ * (not just an Error) can be thrown and caught.
+ */
+export function getMsgFromError(err: unknown): string {
+    return err instanceof Error ? err.message : String(err)
+}