How should I judge if vue.js gets {_ _ ob__: Observer}?

the property value I set to the object is empty, but what I get is {_ _ ob__: Observer}.
I have reset the property value to null for my object, but because it does not match the type of that property, I cannot set it to null. If I get {_ _ ob__: Observer}, how can I judge? Solve it! Thank you!

May.23,2022

Brother, did you open the printed object at the console?
{_ ob__: Observer}
mt: ""
_ _ ob__: Observer {value: { }, dep: Dep, vmCount: 0}
get mt: reactiveSetter (newVal)
_ _ proto__: Object


that day I changed the literal type of object to any and solved the problem
interface obj {
parent:any;
}

.
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