feat : _FilterNull, _FulterUndefined type created

kakasoo · Jan 18, 2024 · 01d54fc · 01d54fc
1 parent 8194a83
commit 01d54fc
Showing 1 changed file with 15 additions and 1 deletion.
diff --git a/src/types/array.type.ts b/src/types/array.type.ts
@@ -4,7 +4,21 @@ import { Equal, ObjectType } from './object.type';
 import { Primitive, ReadonlyOrNot } from './primitive.type';
 
 export namespace ArrayType {
- export type Filter = any;
+ export type _FilterNull<AllowNull extends boolean, Target> = [
+ ...(AllowNull extends false ? (Equal<Target, null> extends true ? [] : [Target]) : [Target]),
+ ];
+
+ export type _FilterUndefined<AllowUndefined extends boolean, Target> = [
+ ...(AllowUndefined extends false ? (Equal<Target, undefined> extends true ? [] : [Target]) : [Target]),
+ ];
+
+ export type Filter<
+ T extends ReadonlyOrNot<any[]>,
+ AllowNull extends boolean,
+ AllowUndefined extends boolean,
+ > = T extends [infer First, ...infer Rest]
+ ? [..._FilterNull<AllowNull, First>, Filter<Rest, AllowNull, AllowUndefined>]
+ : [];
 
  /**
  * Get length of tuple or string literal type.