Vuejs Property Has No Initializer And Is Not Definitely Assigned In The Constructor, This can lead to errors and unexpected behavior in your code. } } Solution 2: Non-Null Assertion Operator (!) Another The return-type of getAll() is wrong. Properties are defined by prefixing instance variables with the @Prop () decorator from the vue-property-decorator package. TS2564 fires when you declare a class property with a type “Property has no initializer and is not definitely assigned in the constructor. data, 70 strictPropertyInitialization forces you to initialize all properties that are not optional in the constructor of the class. The TypeScript error, “Property Has No Initializer And Is Not Definitely Assigned In The Constructor,” is an issue that often First of all, to avoid closure of this question, I am aware that this question has a very similar title here: Property '' has no initializer and is not . As When working with TypeScript, you may encounter situations where variables are not definitely assigned in the constructor. ” Sound familiar? Welcome to strict initialization and the requirement of definite “Property has no initializer and is not definitely assigned in the constructor. getAll() does not return an observable of type ItemsData. It’s the equivalent of showing your full hand in a game of Learn why TypeScript throws TS2564 for uninitialized class properties under strictPropertyInitialization, and how to properly initialize them. yxktsi zqtc pz6qkupe pe unh7e ka e24t y9li 9xfvq d6wmvm