Be nice.
bin/bundle-analyzer.js ../some-project/dist-dirThis project uses yarn for lock file enforcement.
The analyzer interface can be found in server.js. This file sets up the express server and routes and exports the programmatic interface for this package. The express server pushes size data via server-side events upon client connection or if update is called on the server.
The code to calculate sizes from source maps is in sizes.js. The getSizesByFile function asynchronously returns a map of form {'some/path': size}. The groupByHierarchy function converts that map to a tree of form {some: {path: size}}. The normalize function converts that tree into a normalized tree of form {name, children, size}. The exported function asynchronously returns an array of normalized trees.
The CLI code can be found in bin/bundle-analyzer.js. If you run into permission issues, run chmod +x bin/bundle-analyzer. The CLI watches the filesystem via fs.watch.
The client-side code is in client.html. It sets up an server-side-event listener, code to handle URL state via history.pushState, a D3 zoomable sunburst visualization, and some DOM glue code.
The code to calculate sizes is adapted from https://github.com/danvk/source-map-explorer
The code for the zoomable sunburst is adapted from https://bl.ocks.org/vasturiano/12da9071095fbd4df434e60d52d2d58d