Type checking JavaScript

12 sept 2022

While working on a POC or a small script where we don’t really wanna bring Typescript. We can still type checking a JavaScript file with TypeScript in Visual Studio Code by adding // @ts-check on the top of your file:

// @ts-check

let itsAsEasyAs = "abc";
itsAsEasyAs = 123; // Error: Type '123' is not assignable to type 'string'