• Enter command "tsc --init" and hit enter.
• Before that we need to compile ts file with command "tsc app.ts" now it is all defined in below config file automatically.

• Now, You can compile all typescripts by command "tsc". it will automatically create ".js" file of your typescript file.

• If you will create another typescript and hit "tsc" command in command prompt or terminal javascript file will be automatically created for typescript file.

Thank you,