The component does not see the computed property. What could be the problem?

Question

Vue.js

Greetings.
The component does not see the computed property:
The code of the
searchText2 component displays the current value correctly. I set value through mutation.
searchText = empty. When trying to set a value:

Computed property "searchText" was assigned to but it has no setter.

Answer 1

searchText must be declared outside of mapState