Не могу преобразовать скрипт на TypeScript в JavaScript

Я пользуюсь VisualStudio Code установил расширение для ts и js, но почему-то не работает команда.

PS D:\ts> tsc main.ts
tsc : The term 'tsc' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was include
d, verify that the path is correct and try again.
At line:1 char:1
+ tsc main.ts
+ ~~~
    + CategoryInfo          : ObjectNotFound: (tsc:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException