✨TypeScript Object.

typeof const FRUITS = {
  apple: 'Apple',
  orange: 'Orange',
  banana: 'Banana'
} 

type Fruits = typeof FRUITS

type Fruits = {
    apple: string;
    orange: string;
    banana: string;
}

const, keyof, typeof

const FRUITS = {
  apple: 'Apple',
  orange: 'Orange',
  banana: 'Banana'
} as const

type Fruits = typeof FRUITS

type Fruits = {
    readonly apple: "Apple";
    readonly orange: "Orange";
    readonly banana: "Banana";
}

type FruitKey = keyof typeof FRUITS

type FruitKey = "apple" | "orange" | "banana"

type FruitValue = typeof FRUITS[keyof typeof FRUITS]

type FruitValue = "Apple" | "Orange" | "Banana"

type FavoriteFruit = Pick<Fruits, "apple" | "orange">

type FavoriteFruit = {
    readonly apple: "Apple";
    readonly orange: "Orange";
}

type ExcludedFavoriteFruit = Omit<Fruits, "apple" | "orange">

type ExcludedFavoriteFruit = {
    readonly banana: "Banana";
}

&

type Apple = {
  apple: 'Apple'
}

type Orange = {
  orange: 'Orange'
} 

type Banana = {
  banana: 'Banana'
} 

type Fruits = Apple & Orange & Banana

const obj: Fruits = {
  apple: 'Apple',
  orange: 'Orange',
}
Type '{ apple: "Apple"; orange: "Orange"; }' is not assignable to type 'Fruits'.
  Property 'banana' is missing in type '{ apple: "Apple"; orange: "Orange"; }' but required in type 'Banana'.(2322)