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AngusFu/ts-play

Created April 13, 2021 09:17
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ts-play
class A {
x = 1;
}
class B {
y = 2;
}
class C {
z = 3;
}
const Comps = {
A,
B,
C,
} as const;
function instantiate<K extends keyof typeof Comps>(type: K) {
const Ctor = Comps[type];
return new Ctor() as typeof Ctor extends { new (): infer U } ? U : never;
}
const a = instantiate('A');
console.log(a.x);
const b = instantiate('B');
console.log(b.y);
const c = instantiate('C');
console.log(c.z);
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