type A = {
aa: string;
bb: number;
};
type G = {
<T extends keyof A>(a: T): A[T];
<T1 extends keyof A, T2 extends keyof A>(a: T1, b: T2): [A[T1], A[T2]];
// ...
};
const g = {} as G;
const x = g('aa'); //string
const y = g('bb', 'aa'); //[number, string]
const z = g('bb', 'aa', 'cc'); //Expected 1-2 arguments, but got 3
How can I handle an arbitrary number of parameters and retrieve the corresponding types?
If you want to achieve this, utilize the power of variadic tuple types in combination with rest parameters.
type A = {
aa: string;
bb: number;
};
type G = {
<T extends (keyof A)[]>(...keys: T): { [K in keyof T]: A[T[K]] };
};
declare const g: G;
const x = g("aa"); // [string]
const y = g("bb", "aa"); // [number, string]
const z = g("bb", "aa", "cc");
// ~~~~
// Argument of type '"cc"' is not assignable to parameter of type 'keyof A'
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