Jan 11, 2021 · When you use typeof in a type position (like in an interface, type annotation etc.), it gives you the TypeScript type of the item (in build time). When you use it as an expression to …

I am writing a simple de/serializer that works for any type of `State`. Is there any way to get the concrete types of a generic type parameter T?…

Jan 18, 2023 · Ultimately, Typescript is incapable of being a source of truth for anything at runtime, which is an important point of fact. It is comically easy to find ways to get malformed …

May 18, 2024 · Can typescript infer a generic type without it being passed as a function argument? Sorry for the title, I'm having trouble reducing this confusion down to one sentence. …

Apr 12, 2022 · There are a couple of issues here. First, typeof is a runtime check and doesn't care about TS types. Even if you coerced some variable into an incorrect type, typeof would return …

Jun 21, 2022 · Since their introduction they've become mostly obsolete by the as const keyword. It's even mentioned in the enum documentation but it's kinda buried at the bottom. Using a …

Nov 10, 2022 · Using an enum that's mapped to an integer value across C# and TypeScript for example is safer than using a string, unless you take the performance hit use type …

Yes, keyof typeof is correct. myEnum can be used as a type but it references the values of the enum. Therefore using keyof myEnum results in generic string keys.

Aug 10, 2023 · Can instanceOf operator be used to check if an object is an instance of a n interface, or type?

Oct 8, 2020 · How do I use `keyof typeof` on a Map in a class? I have the following but don't want to type checkEntity(entity: string) s parameter with a string. I want it to only accept strings that …