323 lines
6.6 KiB
TypeScript
323 lines
6.6 KiB
TypeScript
import {
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ref,
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effect,
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reactive,
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isRef,
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toRef,
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toRefs,
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Ref,
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isReactive
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} from '../src/index'
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import { computed } from '@vue/runtime-dom'
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import { shallowRef, unref, customRef, triggerRef } from '../src/ref'
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describe('reactivity/ref', () => {
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it('should hold a value', () => {
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const a = ref(1)
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expect(a.value).toBe(1)
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a.value = 2
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expect(a.value).toBe(2)
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})
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it('should be reactive', () => {
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const a = ref(1)
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let dummy
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let calls = 0
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effect(() => {
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calls++
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dummy = a.value
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})
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expect(calls).toBe(1)
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expect(dummy).toBe(1)
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a.value = 2
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expect(calls).toBe(2)
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expect(dummy).toBe(2)
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// same value should not trigger
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a.value = 2
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expect(calls).toBe(2)
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expect(dummy).toBe(2)
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})
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it('should make nested properties reactive', () => {
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const a = ref({
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count: 1
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})
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let dummy
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effect(() => {
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dummy = a.value.count
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})
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expect(dummy).toBe(1)
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a.value.count = 2
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expect(dummy).toBe(2)
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})
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it('should work without initial value', () => {
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const a = ref()
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let dummy
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effect(() => {
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dummy = a.value
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})
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expect(dummy).toBe(undefined)
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a.value = 2
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expect(dummy).toBe(2)
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})
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it('should work like a normal property when nested in a reactive object', () => {
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const a = ref(1)
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const obj = reactive({
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a,
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b: {
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c: a
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}
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})
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let dummy1: number
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let dummy2: number
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effect(() => {
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dummy1 = obj.a
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dummy2 = obj.b.c
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})
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const assertDummiesEqualTo = (val: number) =>
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[dummy1, dummy2].forEach(dummy => expect(dummy).toBe(val))
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assertDummiesEqualTo(1)
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a.value++
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assertDummiesEqualTo(2)
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obj.a++
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assertDummiesEqualTo(3)
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obj.b.c++
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assertDummiesEqualTo(4)
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})
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it('should unwrap nested ref in types', () => {
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const a = ref(0)
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const b = ref(a)
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expect(typeof (b.value + 1)).toBe('number')
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})
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it('should unwrap nested values in types', () => {
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const a = {
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b: ref(0)
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}
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const c = ref(a)
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expect(typeof (c.value.b + 1)).toBe('number')
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})
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it('should NOT unwrap ref types nested inside arrays', () => {
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const arr = ref([1, ref(3)]).value
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expect(isRef(arr[0])).toBe(false)
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expect(isRef(arr[1])).toBe(true)
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expect((arr[1] as Ref).value).toBe(3)
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})
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it('should keep tuple types', () => {
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const tuple: [number, string, { a: number }, () => number, Ref<number>] = [
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0,
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'1',
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{ a: 1 },
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() => 0,
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ref(0)
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]
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const tupleRef = ref(tuple)
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tupleRef.value[0]++
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expect(tupleRef.value[0]).toBe(1)
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tupleRef.value[1] += '1'
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expect(tupleRef.value[1]).toBe('11')
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tupleRef.value[2].a++
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expect(tupleRef.value[2].a).toBe(2)
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expect(tupleRef.value[3]()).toBe(0)
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tupleRef.value[4].value++
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expect(tupleRef.value[4].value).toBe(1)
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})
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it('should keep symbols', () => {
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const customSymbol = Symbol()
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const obj = {
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[Symbol.asyncIterator]: { a: 1 },
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[Symbol.unscopables]: { b: '1' },
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[customSymbol]: { c: [1, 2, 3] }
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}
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const objRef = ref(obj)
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expect(objRef.value[Symbol.asyncIterator]).toBe(obj[Symbol.asyncIterator])
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expect(objRef.value[Symbol.unscopables]).toBe(obj[Symbol.unscopables])
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expect(objRef.value[customSymbol]).toStrictEqual(obj[customSymbol])
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})
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test('unref', () => {
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expect(unref(1)).toBe(1)
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expect(unref(ref(1))).toBe(1)
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})
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test('shallowRef', () => {
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const sref = shallowRef({ a: 1 })
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expect(isReactive(sref.value)).toBe(false)
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let dummy
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effect(() => {
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dummy = sref.value.a
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})
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expect(dummy).toBe(1)
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sref.value = { a: 2 }
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expect(isReactive(sref.value)).toBe(false)
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expect(dummy).toBe(2)
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})
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test('shallowRef force trigger', () => {
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const sref = shallowRef({ a: 1 })
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let dummy
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effect(() => {
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dummy = sref.value.a
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})
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expect(dummy).toBe(1)
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sref.value.a = 2
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expect(dummy).toBe(1) // should not trigger yet
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// force trigger
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triggerRef(sref)
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expect(dummy).toBe(2)
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})
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test('isRef', () => {
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expect(isRef(ref(1))).toBe(true)
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expect(isRef(computed(() => 1))).toBe(true)
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expect(isRef(0)).toBe(false)
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expect(isRef(1)).toBe(false)
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// an object that looks like a ref isn't necessarily a ref
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expect(isRef({ value: 0 })).toBe(false)
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})
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test('toRef', () => {
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const a = reactive({
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x: 1
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})
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const x = toRef(a, 'x')
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expect(isRef(x)).toBe(true)
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expect(x.value).toBe(1)
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// source -> proxy
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a.x = 2
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expect(x.value).toBe(2)
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// proxy -> source
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x.value = 3
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expect(a.x).toBe(3)
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// reactivity
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let dummyX
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effect(() => {
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dummyX = x.value
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})
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expect(dummyX).toBe(x.value)
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// mutating source should trigger effect using the proxy refs
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a.x = 4
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expect(dummyX).toBe(4)
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})
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test('toRefs', () => {
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const a = reactive({
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x: 1,
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y: 2
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})
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const { x, y } = toRefs(a)
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expect(isRef(x)).toBe(true)
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expect(isRef(y)).toBe(true)
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expect(x.value).toBe(1)
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expect(y.value).toBe(2)
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// source -> proxy
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a.x = 2
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a.y = 3
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expect(x.value).toBe(2)
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expect(y.value).toBe(3)
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// proxy -> source
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x.value = 3
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y.value = 4
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expect(a.x).toBe(3)
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expect(a.y).toBe(4)
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// reactivity
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let dummyX, dummyY
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effect(() => {
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dummyX = x.value
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dummyY = y.value
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})
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expect(dummyX).toBe(x.value)
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expect(dummyY).toBe(y.value)
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// mutating source should trigger effect using the proxy refs
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a.x = 4
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a.y = 5
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expect(dummyX).toBe(4)
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expect(dummyY).toBe(5)
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})
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test('toRefs should warn on plain object', () => {
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toRefs({})
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expect(`toRefs() expects a reactive object`).toHaveBeenWarned()
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})
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test('toRefs should warn on plain array', () => {
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toRefs([])
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expect(`toRefs() expects a reactive object`).toHaveBeenWarned()
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})
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test('toRefs reactive array', () => {
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const arr = reactive(['a', 'b', 'c'])
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const refs = toRefs(arr)
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expect(Array.isArray(refs)).toBe(true)
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refs[0].value = '1'
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expect(arr[0]).toBe('1')
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arr[1] = '2'
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expect(refs[1].value).toBe('2')
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})
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test('customRef', () => {
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let value = 1
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let _trigger: () => void
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const custom = customRef((track, trigger) => ({
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get() {
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track()
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return value
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},
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set(newValue: number) {
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value = newValue
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_trigger = trigger
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}
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}))
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expect(isRef(custom)).toBe(true)
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let dummy
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effect(() => {
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dummy = custom.value
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})
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expect(dummy).toBe(1)
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custom.value = 2
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// should not trigger yet
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expect(dummy).toBe(1)
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_trigger!()
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expect(dummy).toBe(2)
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})
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})
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