Considering the following function overloads:
function f(p: 'a'): 'x';
function f(p: 'b'): 'y';
function f(p: 'c'): 'z';
Is there a way to deduce this mapping from f?
type M = {
'a': 'x';
'b': 'y';
'c': 'z';
}
Considering the following function overloads:
function f(p: 'a'): 'x';
function f(p: 'b'): 'y';
function f(p: 'c'): 'z';
Is there a way to deduce this mapping from f?
type M = {
'a': 'x';
'b': 'y';
'c': 'z';
}
Discovered a method that, although somewhat convoluted, is capable of handling a limited number of overload scenarios.
interface Test {
f(p: 'a'): 'x';
f(p: 'b'): 'y';
f(p: 'c'): 'z';
};
type MapArgumentToReturn<F> =
F extends { (a: infer A): infer AR; (b: infer B): infer BR; (c: infer C): infer CR } ? [A, AR]|[B, BR]|[C, CR] :
F extends { (a: infer A): infer AR; (b: infer B): infer BR } ? [A, AR]|[B, BR] :
F extends { (a: infer A): infer AR } ? [A, AR] :
never;
type TupleToObject<T extends [string, any]> = { [key in T[0]]: Extract<T, [key, any]>[1] };
type Result = TupleToObject<MapArgumentToReturn<Test['f']>>;
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