feat: add isNil

src/index.ts

@@ -8,6 +8,7 @@ export { default as clamp } from './clamp'
 export { default as Disposer } from './Disposer'
 export { default as inBrowser } from './inBrowser'
 export { default as isFunction } from './isFunction'
+export { default as isNil } from './isNil'
 export { default as noop } from './noop'
 export { default as reduce } from './reduce'
 export { default as repeat } from './repeat'

src/isNil.ts

@@ -0,0 +1,9 @@
+/**
+ * 检查 value 是否是 null 或 undefined。
+ *
+ * @param value 要检查的值
+ * @returns 是（true）或否（false）
+ */
+export default function isNil(value: any): boolean {
+  return value == null
+}

test/index.test.ts

@@ -95,19 +95,6 @@ describe('reduce', () => {
   })
 })
 
-describe('isFunction', () => {
-  test('是函数', () => {
-    expect(vtils.isFunction(() => ({}))).toBeTruthy()
-    expect(vtils.isFunction(now.getDate)).toBeTruthy()
-  })
-  test('不是函数', () => {
-    expect(vtils.isFunction({})).toBeFalsy()
-    expect(vtils.isFunction(2)).toBeFalsy()
-    expect(vtils.isFunction(/.+/)).toBeFalsy()
-    expect(vtils.isFunction(null)).toBeFalsy()
-  })
-})
-
 describe('repeat', () => {
   test('空字符串', () => {
     expect(vtils.repeat('')).toBe('')
@@ -200,3 +187,31 @@ describe('Disposer', () => {
     expect((disposer as any).jar).toEqual({})
   })
 })
+
+describe('isFunction', () => {
+  test('是', () => {
+    expect(vtils.isFunction(() => ({}))).toBeTruthy()
+    expect(vtils.isFunction(now.getDate)).toBeTruthy()
+  })
+  test('不是', () => {
+    expect(vtils.isFunction({})).toBeFalsy()
+    expect(vtils.isFunction(2)).toBeFalsy()
+    expect(vtils.isFunction(/.+/)).toBeFalsy()
+    expect(vtils.isFunction(null)).toBeFalsy()
+  })
+})
+
+describe('isNil', () => {
+  test('是', () => {
+    expect(vtils.isNil(null)).toBeTruthy()
+    expect(vtils.isNil(undefined)).toBeTruthy()
+    expect(vtils.isNil(void 0)).toBeTruthy()
+  })
+  test('不是', () => {
+    expect(vtils.isNil('')).toBeFalsy()
+    expect(vtils.isNil(0)).toBeFalsy()
+    expect(vtils.isNil(false)).toBeFalsy()
+    expect(vtils.isNil({})).toBeFalsy()
+    expect(vtils.isNil(/X/)).toBeFalsy()
+  })
+})