last update before handover

sample_interface/node_modules/is-alphabetical/index.d.ts

@@ -0,0 +1,8 @@
+/**
+ * Check if the given character code, or the character code at the first
+ * character, is alphabetical.
+ *
+ * @param {string|number} character
+ * @returns {boolean} Whether `character` is alphabetical.
+ */
+export function isAlphabetical(character: string | number): boolean