There are several examples of the debugger displaying an error that is either incorrect, or misleading.
The debugger is complaining that state is not declared. actually, it is declared. it is a return variable of type string. HOWEVER, there is a mistake in the code, namely that this.state is not a string, but an entity, therefore an object, so the assignment is also retyping the variable. i think the real error is that the types are incompatible.
i have another example, that i didn’t screenshot, where i was trying to concatenate several strings. one of them was undefined. the debugger stated that i had not declared the target variable (but the real error is the same as this one: type mismatch)