refactor: Replace Webpack with Vite (#53)

src/pages/background/lib/createSchedule.ts

@@ -0,0 +1,21 @@
+import { UserScheduleStore } from '@shared/storage/UserScheduleStore';
+
+/**
+ * Creates a new schedule with the given name
+ * @param scheduleName the name of the schedule to create
+ * @returns undefined if successful, otherwise an error message
+ */
+export default async function createSchedule(scheduleName: string): Promise<string | undefined> {
+    const schedules = await UserScheduleStore.get('schedules');
+    if (schedules.find(schedule => schedule.name === scheduleName)) {
+        return `Schedule ${scheduleName} already exists`;
+    }
+
+    schedules.push({
+        name: scheduleName,
+        courses: [],
+    });
+
+    await UserScheduleStore.set('schedules', schedules);
+    return undefined;
+}