feat: add has

src/has.ts

@@ -0,0 +1,10 @@
+/**
+ * 检查 key 是否是 obj 自身的属性。
+ *
+ * @param obj 要检查的对象
+ * @param key 要检查的键
+ * @returns 是（true）或否（false）
+ */
+export default function has(obj: object, key: string): boolean {
+  return obj != null && Object.prototype.hasOwnProperty.call(obj, key)
+}

src/index.ts

@@ -10,6 +10,7 @@ export { default as Disposer } from './Disposer'
 export { default as fill } from './fill'
 export { default as forOwn } from './forOwn'
 export { default as getType } from './getType'
+export { default as has } from './has'
 export { default as inBrowser } from './inBrowser'
 export { default as isArray } from './isArray'
 export { default as isBoolean } from './isBoolean'

test/index.test.ts

@@ -611,3 +611,18 @@ describe('fill', () => {
     expect(vtils.fill(emptyArr, '*', -2, -3)).toEqual([undefined, undefined, undefined])
   })
 })
+
+describe('has', () => {
+  test('应只检查自身属性', () => {
+    const obj: any = { x: 1, y: null }
+    const fn = () => {}
+    fn.x = 1
+    Object.setPrototypeOf(fn, obj)
+    expect(vtils.has(obj, 'x')).toBeTruthy()
+    expect(vtils.has(obj, 'y')).toBeTruthy()
+    expect(vtils.has(obj, 'toString')).toBeFalsy()
+    expect(vtils.has(fn, 'x')).toBeTruthy()
+    expect((fn as any).y).toBeNull()
+    expect(vtils.has(fn, 'y')).toBeFalsy()
+  })
+})