Let's start by modifying the definition of ISmthConstructor<T> as follows:
interface ISmthConstructor<T> {
new(value: T): ISmth<T>; // Changed return type
}
The current version in your code implicitly returns an any type, which may not align with your intentions.
I am optimistic about the improvements included in the latest build of TypeScript (3.1.0-dev.20180922). My suggestion is to await the release of TypeScript 3.1 in September 2018, and then implement the following:
declare function f<T extends any[]>(
...args: { [K in keyof T]: ISmthConfig<T[K]> }
): void;
// No error, inferred T as [number, string]
f(
{ type: A, config: 12 },
{ type: B, config: "" }
);
// Error, inferred T as [number, string, string | number]
f(
{ type: A, config: 12 },
{ type: B, config: "" },
{ type: A, config: "" } // Error: string is not assignable to number
);
This leverages the upcoming mapped tuples feature along with inference from mapped types, ensuring that parameters meet specified criteria or report errors accordingly.
This approach looks very promising! 😃
In case you require a solution compatible with TypeScript 3.0, you can define a function with a predetermined maximum argument list length:
function goodEnough<A0, A1, A2, A3, A4, A5, A6>(
...args: [ISmthConfig<A0>?, ISmthConfig<A1>?, ISmthConfig<A2>?, ISmthConfig<A3>?,
ISmthConfig<A4>?, ISmthConfig<A5>?, ISmthConfig<A6>?]
) {
return args;
}
goodEnough({ type: A, config: 12 }); // Valid
goodEnough({ type: B, config: "" }); // Valid
goodEnough(
{ type: A, config: 12 },
{ type: B, config: "" },
{ type: A, config: "" } // Error: string cannot be assigned to number
);
Although verbose and imposing a limit, this method is functional for TypeScript 3.0. 😐
If the above approach yields undesirable results or if you are using TypeScript 2.9 and below, implementing multiple overloads can suffice albeit being more verbose:
function ugh<A0>(a0: ISmthConfig<A0>): [typeof a0];
function ugh<A0, A1>(
a0: ISmthConfig<A0>, a1: ISmthConfig<A1>
): [typeof a0, typeof a1];
function ugh<A0, A1, A2>(
a0: ISmthConfig<A0>, a1: ISmthConfig<A1>, a2: ISmthConfig<A2>
): [typeof a0, typeof a1, typeof a2];
function ugh(...args: ISmthConfig<any>[]): ISmthConfig<any>[] {
return args;
}
ugh({ type: A, config: 12 }); // Valid
ugh({ type: B, config: "" }); // Valid
ugh(
{ type: A, config: 12 },
{ type: B, config: "" },
{ type: A, config: "" } // Error: string not assignable to number
);
While functional, this method is cumbersome. 🙁
To summarize: Await TypeScript 3.1 for an elegant solution, or fallback to less optimal workarounds depending on your requirements.
I hope this information proves beneficial. Best of luck!
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