Cannot find module 'assert' (from Doctrine) when adding React Styleguidist with plain Webpack

 Error:

utility.js:32 Uncaught Error: Cannot find module 'assert'
    at webpackMissingModule (utility.js:32)
    at eval (utility.js:32)
    at eval (utility.js:33)
    at Object../node_modules/doctrine/lib/utility.js (main.bundle.js:6860)
    at __webpack_require__ (main.bundle.js:23007)
    at fn (main.bundle.js:23218)
    at eval (typed.js:27)
    at eval (typed.js:1304)
    at Object../node_modules/doctrine/lib/typed.js (main.bundle.js:6844)
    at __webpack_require__ (main.bundle.js:23007)

This comes from Doctrine, which doesn't declares "assert" as a (peer) dependency. I installed the latest version (2.x) and it didn't work either. I compared with another app that had that dependency satisfied transitively from another module and it had "assert":"1.4.1" installed. I manually installed that one and it worked.