In this post, we will see how to resolve Property does not exist on type ‘A’ while using user-defined typeguard Question: I’m using user-defined type guard to check the type of my object, as described here. The example presented in ...
In this post, we will see how to resolve Type guard two type of functions with same arguments but different return type Question: I would like to check if the passed type is the right type. See code example below. ...
In this post, we will see how to resolve Typescript 4.9: Type ‘NonNullable<K>’ may represent a primitive value, which is not permitted as the right operand of the ‘in’ operator.(2638) Question: Typescript 4.9 features some changes to how the in ...
In this post, we will see how to resolve Typeguarding an unknown nested object Question: I want to create a type guard for an error that I know is a nested object like this: The error, if it exists will ...
Question: I’ve noticed type guards applied to union types narrow the else branch in a potentially unsound way. TS handles it well with native type guards; or I guess more accurately when checking a “type guard” && “some other condition”. ...
Question: PEP 647 introduced type guards to perform complex type narrowing operations using functions. If I have a class where properties can have various types, is there a way that I can perform a similar type narrowing operation on the ...
Question: When making a simple rock, paper, scissors game with typescript I cam across an interaction I couldn’t understand. parseInt throws an error saying score could be set to null despite the type guard. I did some messing around and ...