Is there a way to create a function with dynamic properties?
function magic(...propertyNames:string[]): { ????? : any }
{
....
}
Could the returned type have properties listed in propertyName?
For instance:
type ResultType = {alpha:any, bravo:any};
let res = magic('alpha', 'bravo'); // res is compatible with ResultType
Below is a potential solution that can trigger some wonders:
declare function magic<T extends string[]>(
...propertyNames: T
): Record<T[number], any>;
const result = magic("alpha", "bravo");
type ResultType = typeof result; // {alpha: any; bravo: any;}
Putting the ResultType to test:
const t1: ResultType = {
alpha: "foo",
bravo: 42,
wannaBe: 3 // error (OK)
};
You have the option to further limit the usage of the any type in Record<T[number] any> by adding an extra type parameter, since any doesn't provide much useful typing.
declare function magic<T extends string[], R>(
...propertyNames: T
): Record<T[number], R>;
T[number] grants us access to all item values as a union type. For example, type T = ["alpha", "bravo"]
type TItems = T[number] // "alpha" | "bravo"
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