diff --git a/test/typechecking/typedef-template-strings.mjs b/test/typechecking/typedef-template-strings.mjs
new file mode 100644
index 0000000..52c6112
--- /dev/null
+++ b/test/typechecking/typedef-template-strings.mjs
@@ -0,0 +1,7 @@
+/**
+ * @typedef {"welcome_email" | "email_heading"} EmailLocaleIDs
+ * @typedef {"footer_title" | "footer_sendoff"} FooterLocaleIDs
+ * @typedef {`${EmailLocaleIDs | FooterLocaleIDs}_id`} AllLocaleIDs
+ * @typedef {"en" | "ja" | "pt"} Lang
+ * @typedef {`${Lang}_${AllLocaleIDs}`} LocaleMessageIDs
+ */