How to run my node script as one of the ember's build tasks?

I am working in an ember application. From what I understood, it builds the application using Broccoli. I have a requirement where I need to process some files in the application by running a node script before the building process starts. Now I am running the node script separately and then I start the ember server. What is the right way to achieve it? Can I make it as one of the tasks during ember build process? Where should I maintain the node file in the directory?