How to do it…

We want to use the shorter, more concise style of Flow, but Node cannot execute code with such additives.The solution to our conundrum is easy: just remove everything related to Flow before attempting to run! There is a package, flow-remove-types, that does just that. To start, as usual, you'll have to install the needed package:

npm install flow-remove-types --save-dev

To continue, you will have to enable it by adding a new script. We were writing our code in the src/ directory, so let's send the Flow-cleaned output to the out/ directory. In that directory, we will get the version of the code that we will use in our server:

"scripts": {
    "build": "flow-remove-types src/ -d out/",
    "addTypes": "flow-typed install",
    "update": "npm install && flow-typed install",
    "flow": "flow",
    .
    .
    .
},

To finish, we should also tell Git to ignore the out/ directory. We were already ignoring the node_modules and flow-typed directories, so let's add one more:

**/node_modules 
**/flow-typed 
**/out