Suppose I start with...
type TypeNonGeneric = { prop1: any, prop2: string };
How do I transform it into...
type TypeGeneric<T> = { prop1: T, prop2: string };
I have reviewed the documentation and it appears that I need to create a new generic type that accepts TypeNonGeneric as an input, iterates through its properties, and replaces any instance of any with "T", while keeping all other types unchanged.
To tackle this problem, I recommend using the IfAny utility type which can be found in this helpful response. By utilizing this utility type, we are able to iterate through the given type and verify if there are occurrences of the any data type for each property.
type IfAny<T, Y, N> = 0 extends (1 & T) ? Y : N;
type TypeGeneric<O, T> = {
[K in keyof O]: IfAny<O[K], T, O[K]>
}
Let's illustrate with an example:
type TypeNonGeneric = { prop1: any, prop2: string };
type Result = TypeGeneric<TypeNonGeneric, number>
// type Result = {
// prop1: number;
// prop2: string;
// }
Alternatively, if you wish to replace instances of any with T:
type Result2<T> = TypeGeneric<TypeNonGeneric, T>
// type Result = {
// prop1: T;
// prop2: string;
// }
Check out the Playground for further experimentation!
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