core/packages/runtime-dom/__tests__/customElement.spec.ts

import {
  defineCustomElement,
  h,
  nextTick,
  ref,
  renderSlot,
  VueElement
} from '../src'

describe('defineCustomElement', () => {
  const container = document.createElement('div')
  document.body.appendChild(container)

  beforeEach(() => {
    container.innerHTML = ''
  })

  describe('mounting/unmount', () => {
    const E = defineCustomElement({
      props: {
        msg: {
          type: String,
          default: 'hello'
        }
      },
      render() {
        return h('div', this.msg)
      }
    })
    customElements.define('my-element', E)

    test('should work', () => {
      container.innerHTML = `<my-element></my-element>`
      const e = container.childNodes[0] as VueElement
      expect(e).toBeInstanceOf(E)
      expect(e._instance).toBeTruthy()
      expect(e.shadowRoot!.innerHTML).toBe(`<div>hello</div>`)
    })

    test('should work w/ manual instantiation', () => {
      const e = new E({ msg: 'inline' })
      // should lazy init
      expect(e._instance).toBe(null)
      // should initialize on connect
      container.appendChild(e)
      expect(e._instance).toBeTruthy()
      expect(e.shadowRoot!.innerHTML).toBe(`<div>inline</div>`)
    })

    test('should unmount on remove', async () => {
      container.innerHTML = `<my-element></my-element>`
      const e = container.childNodes[0] as VueElement
      container.removeChild(e)
      await nextTick()
      expect(e._instance).toBe(null)
      expect(e.shadowRoot!.innerHTML).toBe('')
    })

    test('should not unmount on move', async () => {
      container.innerHTML = `<div><my-element></my-element></div>`
      const e = container.childNodes[0].childNodes[0] as VueElement
      const i = e._instance
      // moving from one parent to another - this will trigger both disconnect
      // and connected callbacks synchronously
      container.appendChild(e)
      await nextTick()
      // should be the same instance
      expect(e._instance).toBe(i)
      expect(e.shadowRoot!.innerHTML).toBe('<div>hello</div>')
    })
  })

  describe('props', () => {
    const E = defineCustomElement({
      props: ['foo', 'bar', 'bazQux'],
      render() {
        return [
          h('div', null, this.foo),
          h('div', null, this.bazQux || (this.bar && this.bar.x))
        ]
      }
    })
    customElements.define('my-el-props', E)

    test('props via attribute', async () => {
      // bazQux should map to `baz-qux` attribute
      container.innerHTML = `<my-el-props foo="hello" baz-qux="bye"></my-el-props>`
      const e = container.childNodes[0] as VueElement
      expect(e.shadowRoot!.innerHTML).toBe('<div>hello</div><div>bye</div>')

      // change attr
      e.setAttribute('foo', 'changed')
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe('<div>changed</div><div>bye</div>')

      e.setAttribute('baz-qux', 'changed')
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe(
        '<div>changed</div><div>changed</div>'
      )
    })

    test('props via properties', async () => {
      const e = new E()
      e.foo = 'one'
      e.bar = { x: 'two' }
      container.appendChild(e)
      expect(e.shadowRoot!.innerHTML).toBe('<div>one</div><div>two</div>')

      // reflect
      // should reflect primitive value
      expect(e.getAttribute('foo')).toBe('one')
      // should not reflect rich data
      expect(e.hasAttribute('bar')).toBe(false)

      e.foo = 'three'
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe('<div>three</div><div>two</div>')
      expect(e.getAttribute('foo')).toBe('three')

      e.foo = null
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe('<div></div><div>two</div>')
      expect(e.hasAttribute('foo')).toBe(false)

      e.bazQux = 'four'
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe('<div></div><div>four</div>')
      expect(e.getAttribute('baz-qux')).toBe('four')
    })

    test('attribute -> prop type casting', async () => {
      const E = defineCustomElement({
        props: {
          foo: Number,
          bar: Boolean
        },
        render() {
          return [this.foo, typeof this.foo, this.bar, typeof this.bar].join(
            ' '
          )
        }
      })
      customElements.define('my-el-props-cast', E)
      container.innerHTML = `<my-el-props-cast foo="1"></my-el-props-cast>`
      const e = container.childNodes[0] as VueElement
      expect(e.shadowRoot!.innerHTML).toBe(`1 number false boolean`)

      e.setAttribute('bar', '')
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe(`1 number true boolean`)

      e.setAttribute('foo', '2e1')
      await nextTick()
      expect(e.shadowRoot!.innerHTML).toBe(`20 number true boolean`)
    })

    test('handling properties set before upgrading', () => {
      const E = defineCustomElement({
        props: ['foo'],
        render() {
          return `foo: ${this.foo}`
        }
      })
      const el = document.createElement('my-el-upgrade') as any
      el.foo = 'hello'
      container.appendChild(el)
      customElements.define('my-el-upgrade', E)
      expect(el.shadowRoot.innerHTML).toBe(`foo: hello`)
    })
  })

  describe('emits', () => {
    const E = defineCustomElement({
      setup(_, { emit }) {
        emit('created')
        return () =>
          h('div', {
            onClick: () => emit('my-click', 1)
          })
      }
    })
    customElements.define('my-el-emits', E)

    test('emit on connect', () => {
      const e = new E()
      const spy = jest.fn()
      e.addEventListener('created', spy)
      container.appendChild(e)
      expect(spy).toHaveBeenCalled()
    })

    test('emit on interaction', () => {
      container.innerHTML = `<my-el-emits></my-el-emits>`
      const e = container.childNodes[0] as VueElement
      const spy = jest.fn()
      e.addEventListener('my-click', spy)
      e.shadowRoot!.childNodes[0].dispatchEvent(new CustomEvent('click'))
      expect(spy).toHaveBeenCalled()
      expect(spy.mock.calls[0][0]).toMatchObject({
        detail: [1]
      })
    })
  })

  describe('slots', () => {
    const E = defineCustomElement({
      render() {
        return [
          h('div', null, [
            renderSlot(this.$slots, 'default', undefined, () => [
              h('div', 'fallback')
            ])
          ]),
          h('div', null, renderSlot(this.$slots, 'named'))
        ]
      }
    })
    customElements.define('my-el-slots', E)

    test('default slot', () => {
      container.innerHTML = `<my-el-slots><span>hi</span></my-el-slots>`
      const e = container.childNodes[0] as VueElement
      // native slots allocation does not affect innerHTML, so we just
      // verify that we've rendered the correct native slots here...
      expect(e.shadowRoot!.innerHTML).toBe(
        `<div><slot><div>fallback</div></slot></div><div><slot name="named"></slot></div>`
      )
    })
  })

  describe('provide/inject', () => {
    const Consumer = defineCustomElement({
      inject: ['foo'],
      render(this: any) {
        return h('div', this.foo.value)
      }
    })
    customElements.define('my-consumer', Consumer)

    test('over nested usage', async () => {
      const foo = ref('injected!')
      const Provider = defineCustomElement({
        provide: {
          foo
        },
        render() {
          return h('my-consumer')
        }
      })
      customElements.define('my-provider', Provider)
      container.innerHTML = `<my-provider><my-provider>`
      const provider = container.childNodes[0] as VueElement
      const consumer = provider.shadowRoot!.childNodes[0] as VueElement

      expect(consumer.shadowRoot!.innerHTML).toBe(`<div>injected!</div>`)

      foo.value = 'changed!'
      await nextTick()
      expect(consumer.shadowRoot!.innerHTML).toBe(`<div>changed!</div>`)
    })

    test('over slot composition', async () => {
      const foo = ref('injected!')
      const Provider = defineCustomElement({
        provide: {
          foo
        },
        render() {
          return renderSlot(this.$slots, 'default')
        }
      })
      customElements.define('my-provider-2', Provider)

      container.innerHTML = `<my-provider-2><my-consumer></my-consumer><my-provider-2>`
      const provider = container.childNodes[0]
      const consumer = provider.childNodes[0] as VueElement
      expect(consumer.shadowRoot!.innerHTML).toBe(`<div>injected!</div>`)

      foo.value = 'changed!'
      await nextTick()
      expect(consumer.shadowRoot!.innerHTML).toBe(`<div>changed!</div>`)
    })
  })

  describe('styles', () => {
    test('should attach styles to shadow dom', () => {
      const Foo = defineCustomElement({
        styles: [`div { color: red; }`],
        render() {
          return h('div', 'hello')
        }
      })
      customElements.define('my-el-with-styles', Foo)
      container.innerHTML = `<my-el-with-styles></my-el-with-styles>`
      const el = container.childNodes[0] as VueElement
      const style = el.shadowRoot?.querySelector('style')!
      expect(style.textContent).toBe(`div { color: red; }`)
    })
  })
})