Sometimes using task runners isn't desired, and we end up adding a lot of fields to the scripts section of a package.json.
This tiny (<50 LOC) script helps to visualize the build process by drawing a graph showing how npm run commands depend on each other.
An example of such a graph for a real-world project:
Graphviz is a runtime dependency.
$ npm-run-graph
# (some output in graphiz format)
$ ls
# (some files)
npm-run-graph.png