The installation command is npm install -g typescript
Successful installation will install two commands tsc (compile) and tsserver in the global directory
The file of Hello.ts is
export class Hello{
}
Run the command in the directory of Hello.ts
tsc Hello.ts
Generate Hello.js, the code is
"use strict";
exports.__esModule = true;
var Hello = /** @class */ (function () {
function Hello() {
}
return Hello;
}());
exports.Hello = Hello;