webpack: list reasons why a given module was included (dependents)

script.js

// @ts-check

const treeify = require('treeify');

/**
 * @param {import('webpack').StatsCompilation} stats
 * @param {string | number} id
 */
const getModuleById = (stats, id) => stats.modules.find((module) => module.id === id);

/**
 * @param {import('webpack').StatsCompilation} stats
 * @param {string | number} id
 */
const createTree = (stats, id) => {
  const module = getModuleById(stats, id);
  if (module === undefined) {
    throw new Error('Module not found')
  } else {
    return {
      [id]: module.reasons
        .map((reason) => (reason.moduleId !== null ? createTree(stats, reason.moduleId) : null))
        .reduce((acc, object) => ({ ...acc, ...object }), {}),
    };
  }
};

//
// Example
//

const testId = './client/uploader/state/FormFile/epic.ts';
const stats = /** @type {import('webpack').StatsCompilation} */ (require('./stats.json'));

console.log(treeify.asTree(createTree(stats, testId)));
/*
└─ ./client/uploader/state/FormFile/epic.ts
   └─ ./client/uploader/state/FormStage/epic.ts
      └─ ./client/uploader/state/UploaderReducerState/epic.ts
         └─ ./client/uploader/components/Uploader/Uploader.tsx
            └─ ./client/uploader/components/Uploader/index.ts
               └─ ./client/uploader/index.ts
                  └─ ./app/components/MainRouteContainer/components/UploaderContainer/UploaderContainer.tsx
                     └─ ./app/components/MainRouteContainer/components/UploaderContainer/index.ts
                        └─ ./app/components/MainRouteContainer/MainRouteContainer.tsx
                           └─ ./app/components/MainRouteContainer/index.ts
                              └─ ./app/components/App/App.tsx
                                 └─ ./app/components/App/index.ts
                                    └─ ./server/components/App/App.tsx
                                       └─ ./server/components/App/index.ts
                                          └─ ./server/middlewares/handle-route-middleware.tsx
                                             └─ ./server/index.ts
*/