Why can’t indexed object be assigned?

Check the codes below, the last line has error: Type 'any' is not assignable to type 'never'.(2322)

Why does TypeScript allow invalid keys in a generic function after type narrowing?

I have a generic function, haveSameValue, which checks if certain properties (keys) have the same value across all objects in an array (my question is not about the necessity of such a function):

Can I restrict one field of type to take value from set of keys of another field only?

Consider the following type

Can I restrict one field of type to take value from set of keys of another field only?

Consider the following type

Can I restrict one field of type to take value from set of keys of another field only?

Consider the following type

Can I restrict one field of type to take value from set of keys of another field only?

Consider the following type

Can I restrict one field of type to take value from set of keys of another field only?

Consider the following type

TypeScript inferring incorrect return type when transforming array elements into objects

I have the following function that transforms array elements into objects:

TypeScript inferring incorrect return type when transforming array elements into objects

I have the following function that transforms array elements into objects:

How to reference all parameters except first in TypeScript?

I would like to reference one function’s parameter types in another function, but only use a subset of them.