Why does Typescript loses inference on nested objects when accessing them with dynamic property names?
Playground: https://tsplay.dev/m3Gqqm
Retaining type information when enforcing type relationship between members of a tuple, when used in Mapped type function parameter
I have types that enforce relationship between both members of a tuple within array of these tuples when passed as argument to function i.e. second member is a function that takes in a data parameter matching first member.
TypeScript: declare type for a function that unfold a function
I have an interesting and, I think, a little crazy question. The answer to which I not only couldn’t find, but I couldn’t even figure out how to briefly formulate it for a search query. And so, the question is:
Typescript Types, unexpected behavior when combining mapped type created from Union, that is used within conditional type
I came across some unexpected behavior when trying to expand mapped type I created from an union of object types, when trying to use this type within conditional type: Playground
Typescript Types – transforming function’s argument types, and incensistency between Maped types (worsk) and Recursive type (does not work)
I’ve been fiddling with some transformation of arguments of a function via a recursive type, have some issue to make the type work, I made same simplified example to highlight the issue, together with examples using mapped type (for this toy example mapped type would be enough): Playground
Why is the type {} inferred instead of unknown when strictNullChecks is disabled?
Consider the following code:
`unknown` inferred as `{}` when `strictNullChecks` disabled
Consider the following code:
Getting object name limited to values defined in Set in TypeScript
I have some Set, which defines some IDs:
export const IDS: Set<number> = new Set<number>([1, 30, 50, 9999]);
TypeScript types – accessing function’s argumets Tuple type from function call (Fn type generated by another type)
I have a type that generates Function type with parameters from tuple provided as an arbitrarily long tuple, this is further transformed so that every param may be undefined:
Typescript JSON.parse() to class
I am experimenting with typescript in the typescript playground and found that it allows me to assign the object returned by JSON.parse() to a class, even though the object won’t have any methods, and this causes a runtime error. This is surprising to me as my understanding was that typescript is typesafe as long as you don’t use as or Any.