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Typescript unions not working

Hi,
I'm facing a weird issue with Typescript,
I have created a state like this:

  const [processing, setProcessing] = useState<boolean | null>(false)

  const [processing, setProcessing] = useState<boolean | null>(false)

  const [processing, setProcessing] = useState<boolean | null>(false)

  const [processing, setProcessing] = useState<boolean | null>(false)

I was expecting my IDE (VsCode) to consider

processing

processing

processing

processing as

boolean

boolean

boolean

boolean|

null

null

null

null.

But not sure why,

VsCode

VsCode

VsCode

VsCode considers it as only

boolean

boolean

boolean

boolean