What transformations do enums undergo during runtime in the TypeScript environment?
Fruit.ts
enum Fruit {APPLE, ORANGE};
main.ts
let basket = [Fruit.APPLE, Fruit.ORANGE];
console.log(basket);
The resulting main.js file remains identical to the .ts version, but this may not be feasible.
Here is the JavaScript code for that logic:
// Fruit.js
var Fruit;
(function (Fruit) {
Fruit[Fruit["APPLE"] = 0] = "APPLE";
Fruit[Fruit["ORANGE"] = 1] = "ORANGE";
})(Fruit || (Fruit = {}));
// main.js
var bowl = [Fruit.APPLE, Fruit.ORANGE];
console.log(bowl);
If you wish to optimize, consider using a const enum:
const enum Fruit {APPLE, ORANGE};
This approach will directly inline the values of the enum in the JavaScript code:
// Fruit.js: no content, as the values are directly used in main.js
// main.js
var bowl = [0 /* APPLE */, 1 /* ORANGE */];
console.log(bowl);
Using a const enum eliminates unnecessary JS generated from regular enums.
If you plan on utilizing the Fruit enum outside of the fruit.ts file, it's necessary to export it...
export enum Fruit {APPLE, ORANGE};
Then, in another file where you want to access it, you must reference it like this...
import {Fruit} from './fruit';
var fruitBasket = [Fruit.APPLE, Fruit.ORANGE];
// I must say, calling it a "fruitBasket" is quite fitting
Additionally, to use the import functionality, you need to specify a module type in tsconfig.json (or through command line arguments)
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