Object with required keys

Consider that we have an enum containing the keys:

enum Fruit {
  Apple = 'apple',
  Banana = 'banana',
  Orange = 'orange',
}

The following way we can ensure that the object has all keys from the enum Fruit:

const desserts: { [fruit in Fruit]: string } = {
  [Fruit.Apple]: 'Apple Pie',
  [Fruit.Banana]: 'Banana Bread',
  [Fruit.Orange]: 'Orange Panna Cotta',
};

We can also use an object instead of an enum:

const fruits = ['apple', 'banana', 'orange'] as const;
type Fruit = typeof fruits[number];
const desserts: { [key in Fruit]: string } = {
  apple: 'Apple Pie',
  banana: 'Banana Bread',
  orange: 'Orange Panna Cotta',
};

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• Tag: typescript