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Showing content from https://github.com/vuejs/vue-next/issues/3068 below:

Watch listens to computed and should not be triggered by ref in computed · Issue #3068 · vuejs/core · GitHub

3.0.5

https://jsfiddle.net/twgh75x4/4/

test case

  it('watching multiple sources: computed', async () => {
    let count = 0
    const _ref = ref('1')
    const _computed = computed(() => !!_ref.value)
    
    watch([_computed], () => {
      count.value++
    })
    watch(_computed, () => {
      count.value++  
    })
    
    // When the _ref value changes
    // in factthe _computed value remains the same
    // watch should not be triggered
    _ref.value = '2' 
    // count.value is 1, Is not the expected 0
    await nextTick()

    _ref.value = '3'
    // count.value is 2, Is not the expected 0
    await nextTick()
    expect(count).toBe(0)
  })

experct(count).toBe(0)

experct(count).toBe(2)

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