feat(types): 新增 IsEmptyArray

src/types/IsEmptyArray.test.ts

@@ -0,0 +1,19 @@
+import { expectType } from '../dev'
+import { IsEmptyArray } from './IsEmptyArray'
+
+describe('IsEmptyArray', () => {
+  test('不是空数组', () => {
+    expectType<IsEmptyArray<number>, false>()
+    expectType<IsEmptyArray<boolean>, false>()
+    expectType<IsEmptyArray<string>, false>()
+    expectType<IsEmptyArray<RegExp>, false>()
+    expectType<IsEmptyArray<undefined>, false>()
+    expectType<IsEmptyArray<null>, false>()
+    expectType<IsEmptyArray<unknown>, false>()
+    expectType<IsEmptyArray<{}>, false>()
+  })
+
+  test('是空数组', () => {
+    expectType<IsEmptyArray<[]>, true>()
+  })
+})

src/types/IsEmptyArray.ts

@@ -0,0 +1,17 @@
+import { NonEmptyArray } from './NonEmptyArray'
+
+/**
+ * 判断 `T` 是否是空数组。
+ *
+ * @public
+ * @example
+ * ```typescript
+ * type X = IsEmptyArray<[]>
+ * // => true
+ * ```
+ */
+export type IsEmptyArray<T> = T extends any[]
+  ? T extends NonEmptyArray<any>
+    ? false
+    : true
+  : false

src/types/index.ts

@@ -60,6 +60,7 @@ export * from './Defined'
 export * from './DotPath'
 export * from './FirstParameter'
 export * from './IsAny'
+export * from './IsEmptyArray'
 export * from './IsEmptyObject'
 export * from './IsNever'
 export * from './NonEmptyArray'