First the good news: I dont' get the build error on sid today. Maybe that problem has solved by itself ;-)
But the autopkgtest fails with the babelHelpers missing error as rollup and node-react: /usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:6544 var isSymbol = USE_NATIVE && babelHelpers.typeof($Symbol.iterator) == 'symbol' ? function (it) { ^ ReferenceError: babelHelpers is not defined at Object.<anonymous> (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:6544:30) at __webpack_require__ (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:20:30) at Object.<anonymous> (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:18563:1) at __webpack_require__ (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:20:30) at Object.<anonymous> (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:6470:31) at __webpack_require__ (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:20:30) at Object.<anonymous> (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:1418:15) at __webpack_require__ (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:20:30) at Object.<anonymous> (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:2983:16) at __webpack_require__ (/usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js:20:30) It seems the rollup-plugin-babel cjs build with webpack has something wrong. It is much larger than the one built by upstream with rollup: npm install rollup-plugin-babel ls -l node_modules/rollup-plugin-babel/dist/* /usr/lib/nodejs/rollup-plugin-babel/dist/* ls -l node_modules/rollup-plugin-babel/dist/* /usr/lib/nodejs/rollup-plugin-babel/dist/* -rw-r--r-- 1 root root 5533 Dec 18 12:22 node_modules/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js -rw-r--r-- 1 root root 5486 Dec 18 12:22 node_modules/rollup-plugin-babel/dist/rollup-plugin-babel.es.js -rw-r--r-- 1 root root 1526968 Jan 5 14:35 /usr/lib/nodejs/rollup-plugin-babel/dist/rollup-plugin-babel.cjs.js I noticed that these messages come up during the node-rollup-plugin-babel build with webpack (sorted and compacted): WARNING in /usr/lib/nodejs/babel-core/lib/transformation/file/options/option-manager.js 190:19-37 Critical dependency: the request of a dependency is an expression 307:16-34 Critical dependency: the request of a dependency is an expression WARNING in /usr/lib/nodejs/babel-core/lib/transformation/file/index.js 511:24-39 Critical dependency: the request of a dependency is an expression WARNING in /usr/lib/nodejs/base/utils.js 3:34-41 Critical dependency: require function is used in a way in which dependencies cannot be statically extracted It looks like this is by design in webpack: https://github.com/webpack/webpack-dev-server/issues/212 SO apparently this can not be built with webpack after all ... Paolo