chore(utils.ts): add custom helpers and types for better code organization and reusability

assets/ts/utils.ts

@@ -1,3 +1,7 @@
+/**
+ * custom helpers
+ */
+
 export function increment(num: number, length: number): number {
   return (num + 1) % length
 }
@@ -14,6 +18,14 @@ export function isMobile(): boolean {
   return window.matchMedia('(hover: none)').matches
 }
 
+export function getRandom(min: number, max: number) {
+  return Math.floor(Math.random() * (max - min + 1)) + min
+}
+
+/**
+ * custom types
+ */
+
 export class Watchable<T> {
   constructor(private obj: T) {}
   private watchers: (() => void)[] = []