How to use the @posva/vuefire-test-helpers.Vue function in @posva/vuefire-test-helpers

async function createVm() {
    const source = new MockFirebase().child('data')
    const vm = new Vue({
      // purposely set items as null
      // but it's a good practice to set it to an empty array
      data: () => ({
        items: [],
        item: null,
      }),
    })
    await tick()

    return { vm, source }
  }

beforeEach(async () => {
    // @ts-ignore
    collection = db.collection()
    // @ts-ignore
    document = db.collection().doc()
    // @ts-ignore
    vm = new Vue({
      // purposely set items as null
      // but it's a good practice to set it to an empty array
      data: () => ({
        items: null,
        item: null,
      }),
    })
    await tick()
  })