lib: +char typeguard

jimmy-zhening-luo · Jan 28, 2025 · 908f93c · 908f93c
1 parent 7c92c63
commit 908f93c
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/lib/app/index.ts b/src/lib/app/index.ts
@@ -70,6 +70,13 @@ export default abstract class App<
     );
   }
 
+  protected static char(string = "", cause = "") {
+    if (string.length !== 1)
+      throw new TypeError(`"${string}" is non-char (length: ${string.length})`, { cause });
+
+    return string as char;
+  }
+
   private static error(app: stringful, error: unknown) {
     function cast(e: unknown) {
       return typeof e === "object" && e !== null && "message" in e