Using browserify's deps function to create a mapping between bundles and their dependencies.

browserify-deps.js

var b = require('browserify')();
var dep2bundleSrcs = [];
b.add(modulePath);
b.deps().pipe(require('through')(function (dep) {
    var fullPath = path.resolve(dep.id);
    if (undefined === dep2bundleSrcs[fullPath]) {
        dep2bundleSrcs[fullPath] = [];
        console.log("adding bundle for dep", fullPath);
    }
    dep2bundleSrcs[fullPath].push(bundleMainScriptPath);
    bundlesBySrc[bundleMainScriptPath] = fileData;
})).pipe(process.stdout);