665 lines
15 KiB
TypeScript
665 lines
15 KiB
TypeScript
import {
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watch,
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watchEffect,
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reactive,
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computed,
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nextTick,
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ref,
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h
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} from '../src/index'
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import { render, nodeOps, serializeInner } from '@vue/runtime-test'
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import {
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ITERATE_KEY,
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DebuggerEvent,
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TrackOpTypes,
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TriggerOpTypes,
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triggerRef
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} from '@vue/reactivity'
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// reference: https://vue-composition-api-rfc.netlify.com/api.html#watch
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describe('api: watch', () => {
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it('effect', async () => {
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const state = reactive({ count: 0 })
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let dummy
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watchEffect(() => {
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dummy = state.count
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})
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expect(dummy).toBe(0)
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state.count++
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await nextTick()
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expect(dummy).toBe(1)
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})
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it('watching single source: getter', async () => {
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const state = reactive({ count: 0 })
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let dummy
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watch(
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() => state.count,
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(count, prevCount) => {
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dummy = [count, prevCount]
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// assert types
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count + 1
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if (prevCount) {
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prevCount + 1
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}
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}
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)
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state.count++
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await nextTick()
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expect(dummy).toMatchObject([1, 0])
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})
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it('watching single source: ref', async () => {
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const count = ref(0)
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let dummy
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watch(count, (count, prevCount) => {
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dummy = [count, prevCount]
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// assert types
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count + 1
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if (prevCount) {
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prevCount + 1
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}
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})
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count.value++
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await nextTick()
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expect(dummy).toMatchObject([1, 0])
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})
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it('watching single source: array', async () => {
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const array = reactive([] as number[])
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const spy = jest.fn()
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watch(array, spy)
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array.push(1)
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await nextTick()
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expect(spy).toBeCalledTimes(1)
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expect(spy).toBeCalledWith([1], expect.anything(), expect.anything())
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})
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it('watching single source: computed ref', async () => {
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const count = ref(0)
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const plus = computed(() => count.value + 1)
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let dummy
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watch(plus, (count, prevCount) => {
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dummy = [count, prevCount]
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// assert types
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count + 1
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if (prevCount) {
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prevCount + 1
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}
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})
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count.value++
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await nextTick()
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expect(dummy).toMatchObject([2, 1])
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})
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it('watching primitive with deep: true', async () => {
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const count = ref(0)
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let dummy
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watch(
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count,
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(c, prevCount) => {
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dummy = [c, prevCount]
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},
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{
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deep: true
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}
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)
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count.value++
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await nextTick()
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expect(dummy).toMatchObject([1, 0])
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})
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it('directly watching reactive object (with automatic deep: true)', async () => {
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const src = reactive({
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count: 0
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})
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let dummy
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watch(src, ({ count }) => {
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dummy = count
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})
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src.count++
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await nextTick()
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expect(dummy).toBe(1)
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})
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it('watching multiple sources', async () => {
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const state = reactive({ count: 1 })
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const count = ref(1)
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const plus = computed(() => count.value + 1)
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let dummy
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watch([() => state.count, count, plus], (vals, oldVals) => {
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dummy = [vals, oldVals]
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// assert types
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vals.concat(1)
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oldVals.concat(1)
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})
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state.count++
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count.value++
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await nextTick()
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expect(dummy).toMatchObject([[2, 2, 3], [1, 1, 2]])
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})
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it('watching multiple sources: readonly array', async () => {
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const state = reactive({ count: 1 })
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const status = ref(false)
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let dummy
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watch([() => state.count, status] as const, (vals, oldVals) => {
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dummy = [vals, oldVals]
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const [count] = vals
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const [, oldStatus] = oldVals
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// assert types
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count + 1
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oldStatus === true
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})
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state.count++
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status.value = true
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await nextTick()
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expect(dummy).toMatchObject([[2, true], [1, false]])
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})
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it('watching multiple sources: reactive object (with automatic deep: true)', async () => {
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const src = reactive({ count: 0 })
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let dummy
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watch([src], ([state]) => {
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dummy = state
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// assert types
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state.count === 1
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})
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src.count++
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await nextTick()
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expect(dummy).toMatchObject({ count: 1 })
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})
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it('warn invalid watch source', () => {
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// @ts-ignore
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watch(1, () => {})
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expect(`Invalid watch source`).toHaveBeenWarned()
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})
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it('warn invalid watch source: multiple sources', () => {
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watch([1], () => {})
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expect(`Invalid watch source`).toHaveBeenWarned()
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})
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it('stopping the watcher (effect)', async () => {
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const state = reactive({ count: 0 })
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let dummy
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const stop = watchEffect(() => {
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dummy = state.count
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})
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expect(dummy).toBe(0)
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stop()
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state.count++
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await nextTick()
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// should not update
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expect(dummy).toBe(0)
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})
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it('stopping the watcher (with source)', async () => {
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const state = reactive({ count: 0 })
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let dummy
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const stop = watch(
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() => state.count,
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count => {
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dummy = count
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}
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)
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state.count++
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await nextTick()
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expect(dummy).toBe(1)
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stop()
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state.count++
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await nextTick()
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// should not update
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expect(dummy).toBe(1)
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})
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it('cleanup registration (effect)', async () => {
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const state = reactive({ count: 0 })
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const cleanup = jest.fn()
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let dummy
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const stop = watchEffect(onCleanup => {
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onCleanup(cleanup)
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dummy = state.count
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})
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expect(dummy).toBe(0)
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state.count++
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await nextTick()
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expect(cleanup).toHaveBeenCalledTimes(1)
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expect(dummy).toBe(1)
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stop()
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expect(cleanup).toHaveBeenCalledTimes(2)
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})
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it('cleanup registration (with source)', async () => {
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const count = ref(0)
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const cleanup = jest.fn()
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let dummy
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const stop = watch(count, (count, prevCount, onCleanup) => {
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onCleanup(cleanup)
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dummy = count
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})
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count.value++
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await nextTick()
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expect(cleanup).toHaveBeenCalledTimes(0)
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expect(dummy).toBe(1)
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count.value++
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await nextTick()
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expect(cleanup).toHaveBeenCalledTimes(1)
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expect(dummy).toBe(2)
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stop()
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expect(cleanup).toHaveBeenCalledTimes(2)
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})
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it('flush timing: post (default)', async () => {
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const count = ref(0)
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let callCount = 0
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let result
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const assertion = jest.fn(count => {
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callCount++
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// on mount, the watcher callback should be called before DOM render
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// on update, should be called after the count is updated
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const expectedDOM = callCount === 1 ? `` : `${count}`
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result = serializeInner(root) === expectedDOM
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})
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const Comp = {
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setup() {
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watchEffect(() => {
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assertion(count.value)
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})
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return () => count.value
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}
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}
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const root = nodeOps.createElement('div')
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render(h(Comp), root)
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expect(assertion).toHaveBeenCalledTimes(1)
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expect(result).toBe(true)
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count.value++
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await nextTick()
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expect(assertion).toHaveBeenCalledTimes(2)
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expect(result).toBe(true)
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})
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it('flush timing: pre', async () => {
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const count = ref(0)
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const count2 = ref(0)
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let callCount = 0
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let result1
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let result2
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const assertion = jest.fn((count, count2Value) => {
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callCount++
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// on mount, the watcher callback should be called before DOM render
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// on update, should be called before the count is updated
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const expectedDOM = callCount === 1 ? `` : `${count - 1}`
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result1 = serializeInner(root) === expectedDOM
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// in a pre-flush callback, all state should have been updated
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const expectedState = callCount - 1
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result2 = count === expectedState && count2Value === expectedState
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})
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const Comp = {
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setup() {
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watchEffect(
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() => {
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assertion(count.value, count2.value)
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},
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{
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flush: 'pre'
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}
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)
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return () => count.value
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}
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}
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const root = nodeOps.createElement('div')
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render(h(Comp), root)
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expect(assertion).toHaveBeenCalledTimes(1)
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expect(result1).toBe(true)
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expect(result2).toBe(true)
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count.value++
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count2.value++
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await nextTick()
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// two mutations should result in 1 callback execution
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expect(assertion).toHaveBeenCalledTimes(2)
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expect(result1).toBe(true)
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expect(result2).toBe(true)
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})
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it('flush timing: sync', async () => {
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const count = ref(0)
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const count2 = ref(0)
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let callCount = 0
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let result1
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let result2
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const assertion = jest.fn(count => {
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callCount++
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// on mount, the watcher callback should be called before DOM render
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// on update, should be called before the count is updated
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const expectedDOM = callCount === 1 ? `` : `${count - 1}`
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result1 = serializeInner(root) === expectedDOM
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// in a sync callback, state mutation on the next line should not have
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// executed yet on the 2nd call, but will be on the 3rd call.
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const expectedState = callCount < 3 ? 0 : 1
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result2 = count2.value === expectedState
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})
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const Comp = {
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setup() {
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watchEffect(
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() => {
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assertion(count.value)
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},
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{
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flush: 'sync'
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}
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)
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return () => count.value
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}
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}
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const root = nodeOps.createElement('div')
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render(h(Comp), root)
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expect(assertion).toHaveBeenCalledTimes(1)
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expect(result1).toBe(true)
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expect(result2).toBe(true)
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count.value++
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count2.value++
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await nextTick()
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expect(assertion).toHaveBeenCalledTimes(3)
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expect(result1).toBe(true)
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expect(result2).toBe(true)
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})
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it('should not fire on component unmount w/ flush: post', async () => {
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const toggle = ref(true)
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const cb = jest.fn()
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const Comp = {
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setup() {
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watch(toggle, cb)
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},
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render() {}
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}
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const App = {
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render() {
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return toggle.value ? h(Comp) : null
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}
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}
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render(h(App), nodeOps.createElement('div'))
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expect(cb).not.toHaveBeenCalled()
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toggle.value = false
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await nextTick()
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expect(cb).not.toHaveBeenCalled()
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})
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it('should fire on component unmount w/ flush: pre', async () => {
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const toggle = ref(true)
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const cb = jest.fn()
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const Comp = {
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setup() {
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watch(toggle, cb, { flush: 'pre' })
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},
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render() {}
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}
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const App = {
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render() {
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return toggle.value ? h(Comp) : null
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}
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}
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render(h(App), nodeOps.createElement('div'))
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expect(cb).not.toHaveBeenCalled()
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toggle.value = false
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await nextTick()
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expect(cb).toHaveBeenCalledTimes(1)
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})
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it('deep', async () => {
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const state = reactive({
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nested: {
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count: ref(0)
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},
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array: [1, 2, 3],
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map: new Map([['a', 1], ['b', 2]]),
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set: new Set([1, 2, 3])
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})
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let dummy
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watch(
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() => state,
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state => {
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dummy = [
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state.nested.count,
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state.array[0],
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state.map.get('a'),
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state.set.has(1)
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]
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},
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{ deep: true }
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)
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state.nested.count++
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await nextTick()
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expect(dummy).toEqual([1, 1, 1, true])
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// nested array mutation
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state.array[0] = 2
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await nextTick()
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expect(dummy).toEqual([1, 2, 1, true])
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// nested map mutation
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state.map.set('a', 2)
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await nextTick()
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expect(dummy).toEqual([1, 2, 2, true])
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// nested set mutation
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state.set.delete(1)
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await nextTick()
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expect(dummy).toEqual([1, 2, 2, false])
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})
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it('immediate', async () => {
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const count = ref(0)
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const cb = jest.fn()
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watch(count, cb, { immediate: true })
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expect(cb).toHaveBeenCalledTimes(1)
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count.value++
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await nextTick()
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expect(cb).toHaveBeenCalledTimes(2)
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})
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it('immediate: triggers when initial value is null', async () => {
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const state = ref(null)
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const spy = jest.fn()
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watch(() => state.value, spy, { immediate: true })
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expect(spy).toHaveBeenCalled()
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})
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it('immediate: triggers when initial value is undefined', async () => {
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const state = ref()
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const spy = jest.fn()
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watch(() => state.value, spy, { immediate: true })
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expect(spy).toHaveBeenCalled()
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state.value = 3
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await nextTick()
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expect(spy).toHaveBeenCalledTimes(2)
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// testing if undefined can trigger the watcher
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state.value = undefined
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await nextTick()
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expect(spy).toHaveBeenCalledTimes(3)
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// it shouldn't trigger if the same value is set
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state.value = undefined
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await nextTick()
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expect(spy).toHaveBeenCalledTimes(3)
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})
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it('warn immediate option when using effect', async () => {
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const count = ref(0)
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let dummy
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watchEffect(
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() => {
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dummy = count.value
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},
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// @ts-ignore
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{ immediate: false }
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)
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expect(dummy).toBe(0)
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expect(`"immediate" option is only respected`).toHaveBeenWarned()
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count.value++
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await nextTick()
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expect(dummy).toBe(1)
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})
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it('warn and not respect deep option when using effect', async () => {
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const arr = ref([1, [2]])
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const spy = jest.fn()
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watchEffect(
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() => {
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spy()
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return arr
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},
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// @ts-ignore
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{ deep: true }
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)
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expect(spy).toHaveBeenCalledTimes(1)
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;(arr.value[1] as Array<number>)[0] = 3
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await nextTick()
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expect(spy).toHaveBeenCalledTimes(1)
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expect(`"deep" option is only respected`).toHaveBeenWarned()
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})
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it('onTrack', async () => {
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const events: DebuggerEvent[] = []
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let dummy
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const onTrack = jest.fn((e: DebuggerEvent) => {
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events.push(e)
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})
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const obj = reactive({ foo: 1, bar: 2 })
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watchEffect(
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() => {
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dummy = [obj.foo, 'bar' in obj, Object.keys(obj)]
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},
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{ onTrack }
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)
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await nextTick()
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expect(dummy).toEqual([1, true, ['foo', 'bar']])
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expect(onTrack).toHaveBeenCalledTimes(3)
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expect(events).toMatchObject([
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{
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target: obj,
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type: TrackOpTypes.GET,
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key: 'foo'
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},
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{
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target: obj,
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type: TrackOpTypes.HAS,
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key: 'bar'
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},
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{
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target: obj,
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type: TrackOpTypes.ITERATE,
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key: ITERATE_KEY
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}
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])
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})
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it('onTrigger', async () => {
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const events: DebuggerEvent[] = []
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let dummy
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const onTrigger = jest.fn((e: DebuggerEvent) => {
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events.push(e)
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})
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const obj = reactive({ foo: 1 })
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watchEffect(
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() => {
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dummy = obj.foo
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},
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{ onTrigger }
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)
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await nextTick()
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expect(dummy).toBe(1)
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obj.foo++
|
|
await nextTick()
|
|
expect(dummy).toBe(2)
|
|
expect(onTrigger).toHaveBeenCalledTimes(1)
|
|
expect(events[0]).toMatchObject({
|
|
type: TriggerOpTypes.SET,
|
|
key: 'foo',
|
|
oldValue: 1,
|
|
newValue: 2
|
|
})
|
|
|
|
delete obj.foo
|
|
await nextTick()
|
|
expect(dummy).toBeUndefined()
|
|
expect(onTrigger).toHaveBeenCalledTimes(2)
|
|
expect(events[1]).toMatchObject({
|
|
type: TriggerOpTypes.DELETE,
|
|
key: 'foo',
|
|
oldValue: 2
|
|
})
|
|
})
|
|
|
|
it('should work sync', () => {
|
|
const v = ref(1)
|
|
let calls = 0
|
|
|
|
watch(
|
|
v,
|
|
() => {
|
|
++calls
|
|
},
|
|
{
|
|
flush: 'sync'
|
|
}
|
|
)
|
|
|
|
expect(calls).toBe(0)
|
|
v.value++
|
|
expect(calls).toBe(1)
|
|
})
|
|
|
|
test('should force trigger on triggerRef when watching a ref', async () => {
|
|
const v = ref({ a: 1 })
|
|
let sideEffect = 0
|
|
watch(v, obj => {
|
|
sideEffect = obj.a
|
|
})
|
|
|
|
v.value = v.value
|
|
await nextTick()
|
|
// should not trigger
|
|
expect(sideEffect).toBe(0)
|
|
|
|
v.value.a++
|
|
await nextTick()
|
|
// should not trigger
|
|
expect(sideEffect).toBe(0)
|
|
|
|
triggerRef(v)
|
|
await nextTick()
|
|
// should trigger now
|
|
expect(sideEffect).toBe(2)
|
|
})
|
|
})
|