🙂 Expected behavior In both ways of composing map functions (map1, map2), typescript could infer generic type arguments correctly. Additional information about the issue This code is heavily ...

Similar to variable types, you can define types for function parameters and return values. While the parameter type is declared next to the parameter name, the return type is declared just before ...

Checked Returns for Conditional and Indexed Access Types: TypeScript 5.8 enhances type inference by allowing functions to have return types that depend on their parameters. This means that the return ...

🔍 Search Terms "inferring parameters types", "infer input from output types" Viability Checklist This wouldn't be a breaking change in existing TypeScript/JavaScript code This wouldn't change the ...

Using generics in TypeScript is very similar to using them in, for example, C#. This method calls a generic function, specifying the data type to be used (string, in this case): res = ...