https://blog.risingstack.com/building-a-node-js-app-with-typescript-tutorial/

feature

1. support type
2. class and interface

use interface

interface Options { color: string; volume: number }

let options = {} as Options;
options.color = "red";
options.volume = 11;

gulp

https://www.typescriptlang.org/docs/handbook/gulp.html

npm install --save-dev typescript gulp gulp-typescript