Modificateur de propriété

handler.ts

const handler =
  <K extends keyof Struct>(prop: K) =>
  <V extends Struct[K]>(value: V) => {
    onChange({
      ...struct,
      [prop]: v,
    });
  };

sample.ts

import {handler} from './handler';

interface Struct {
  a: string;
  b: number;
}

handler('a')('1') // ✔
handler('b')(1) // ✔
handler('b')('1') // 𐄂
handler('a')(1) // 𐄂
handler('c')(1) // 𐄂