Typescript Primer

Adding typescript to you project npm install typescript ts-node -g --save-dev

# Generate typescript configration
tsc --init

open ./tsconfig.json
...
"target": "es7"    // compile typescript to javascript ECMAScript7
"out": "./build"   // dump built javascript to a directory
...

# compile typscript into javascript
tsc

# start a typescript repl
ts-node