fix: implement simply array polyfills (fixes #328)

test/unit/utils.test.js

@@ -0,0 +1,63 @@
+/**
+ * @jest-environment node
+ */
+import { findIndex, includes, toArray } from '../../src/utils/array'
+import { ensureIsArray } from '../../src/utils/ensure'
+import { hasGlobalWindowFn } from '../../src/utils/window'
+
+describe('shared', () => {
+  afterEach(() => jest.restoreAllMocks())
+
+  test('ensureIsArray ensures var is array', () => {
+    let a = { p: 1 }
+    expect(ensureIsArray(a)).toEqual([])
+
+    a = 1
+    expect(ensureIsArray(a)).toEqual([])
+
+    a = [1]
+    expect(ensureIsArray(a)).toBe(a)
+  })
+
+  test('ensureIsArray ensures obj prop is array', () => {
+    const a = { p: 1 }
+    expect(ensureIsArray(a, 'p')).toEqual({ p: [] })
+  })
+
+  test('no error when window is not defined', () => {
+    expect(hasGlobalWindowFn()).toBe(false)
+  })
+
+  /* eslint-disable no-extend-native */
+  test('findIndex polyfill', () => {
+    const _findIndex = Array.prototype.findIndex
+    Array.prototype.findIndex = false
+
+    const arr = [1, 2, 3]
+    expect(findIndex(arr, v => v === 2)).toBe(1)
+    expect(findIndex(arr, v => v === 4)).toBe(-1)
+
+    Array.prototype.findIndex = _findIndex
+  })
+
+  test('includes polyfill', () => {
+    const _includes = Array.prototype.includes
+    Array.prototype.includes = false
+
+    const arr = [1, 2, 3]
+    expect(includes(arr, 2)).toBe(true)
+    expect(includes(arr, 4)).toBe(false)
+
+    Array.prototype.includes = _includes
+  })
+
+  test('from/toArray polyfill', () => {
+    const _from = Array.from
+    Array.from = false
+
+    expect(toArray('foo')).toEqual(['f', 'o', 'o'])
+
+    Array.from = _from
+  })
+  /* eslint-enable no-extend-native */
+})