$ cat >webpack.config.js <<EOF const BundleTracker = require("webpack-bundle-tracker"); module.exports = {  plugins: [new BundleTracker({ relativePath: true })], }; EOF $ touch src.js $ npm i webpack webpack-bundle-tracker webpack-cli … + webpack-cli@4.1.0 + webpack@5.3.2 + webpack-bundle-tracker@1.0.0-alpha.1 added 147 packages from 168 contributors and audited 147 packages in 5.273s … $ npx webpack [webpack-cli] TypeError [ERR_INVALID_ARG_TYPE]: The "to" argument must be of type string. Received undefined  at validateString (internal/validators.js:124:11)  at Object.relative (path.js:1054:5)  at /tmp/test/node_modules/webpack-bundle-tracker/lib/index.js:138:30  at /tmp/test/node_modules/lodash.foreach/index.js:221:11  at baseForOwn (/tmp/test/node_modules/lodash.foreach/index.js:153:20)  at /tmp/test/node_modules/lodash.foreach/index.js:190:14  at forEach (/tmp/test/node_modules/lodash.foreach/index.js:290:10)  at BundleTrackerPlugin._handleDone (/tmp/test/node_modules/webpack-bundle-tracker/lib/index.js:123:5)  at Hook.eval [as callAsync] (eval at create (/tmp/test/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:9:1)  at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (/tmp/test/node_modules/tapable/lib/Hook.js:18:14) {  code: 'ERR_INVALID_ARG_TYPE' }