diff --git a/db/index.ts b/db/index.ts
index c5caa03..b919883 100644
--- a/db/index.ts
+++ b/db/index.ts
@@ -12,9 +12,7 @@ mongoose.connect(MONGO_URI, {
   serverSelectionTimeoutMS: 3000,
 })
 
-export async function getBookedDays(
-  uuidsToIngore?: string[]
-): Promise<string[]> {
+export async function getBookedDays(uuidsToIngore?: string[]) {
   const [bookedInDatabase, bookedInCalendar] = await Promise.all([
     BookingModel.findBookedDays(uuidsToIngore),
     calendarGetBookedDays(),
diff --git a/helpers/array.ts b/helpers/array.ts
index eeca9b0..130a046 100644
--- a/helpers/array.ts
+++ b/helpers/array.ts
@@ -17,6 +17,6 @@ export function getNextBigger<T>(array: T[], pivot: T): T {
   return array.sort().find((day) => day > pivot)
 }
 
-export function uniqueFilter(value, index, self) {
+export function uniqueFilter<T>(value: T, index: number, self: T[]) {
   return self.indexOf(value) === index
 }