you need to make this call from the connectedCallback()
method. doing so will have resolved your import by this time. See below:
import { myFunctionmyfunction } from 'c/reusableLWCFunctions';
export default class myLWC extends NavigationMixin(LightningElement){
connectedCallback(){
myFunctionmyfunction('THIS WAS CALLED FROM IMPORTED FUNCTION');
}
}
the constructor for your case would really be useless. in fact in most cases I don't even see the need in using it. connectedCallback
is where you want to make any calls to your imports.