feat: allow type guards for filter (#39) (#40)

pbeshai · May 12, 2021 · 149fc1d · 149fc1d
1 parent 72eaf3b
commit 149fc1d
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/packages/tidy/src/filter.ts b/packages/tidy/src/filter.ts
@@ -4,6 +4,12 @@ import { TidyFn } from './types';
  * Filters items
  * @param filterFn Returns true to keep the item, false to filter out
  */
+export function filter<T extends object, O extends T>(
+  filterFn: (item: T, index: number, array: T[]) => item is O
+): TidyFn<T, O>;
+export function filter<T extends object>(
+  filterFn: (item: T, index: number, array: T[]) => boolean
+): TidyFn<T>;
 export function filter<T extends object>(
   filterFn: (item: T, index: number, array: T[]) => boolean
 ): TidyFn<T> {