Broccoli is a great tool for building up assets gradually through a list of changing steps. Unfortunately, when things go wrong in one of your steps it is often very difficult to figure out what is happening at each stage.
Here is where broccoli-stew comes in, it is a Broccoli utility library that contains a number of super useful plugins with a posix flair to them. Tools like mv, rename, find, map, rm, log, and debug make it much easier to reason about your Broccoli build.
And thanks to the debug and log plugins it has become massively easier to log the contents of each tree, or get an extra copy to poke at manually.