Are semicolons necessary in Typescript 2?

Question

I've been searching for an answer to this question for a while and am getting mixed messages. I know semicolons are necessary in JavaScript because of the automatic semicolon insertion (ASI), but does TypeScript have the same restriction?

I would assume that it doesn't, since it transpiles down to JavaScript, and most likely inserts a semicolon for you in the places where the ASI would cause a problem. But I would like to know for sure.

Answer 1

TypeScript follows the same ASI rules as JavaScript. Semicolons are technically not required in either language, save for a few rare, specific cases. It's best to be educated on ASI regardless of your approach.

Notably, ASI also applies inside of interface and object type bodies:

// valid
interface Person {
  name: string;
  age: number;
}

// also valid
interface Person {
  name: string
  age: number
}

// not valid
interface Person { name: string age: number }