Instascan: Problema ao usar npm e webpack

Ao construir com o webpack, tenho este problema:

Apenas esta linha em meu código:
import Instascan from 'instascan'

ERROR in ./node_modules/instascan/src/zxing.js
Module not found: Error: Can't resolve 'fs' in '/Users/enzo/Copy/projects/elevenyellow/coinfy/node_modules/instascan/src'
resolve 'fs' in '/Users/enzo/Copy/projects/elevenyellow/coinfy/node_modules/instascan/src'
  Parsed request is a module
  using description file: /Users/enzo/Copy/projects/elevenyellow/coinfy/node_modules/instascan/package.json (relative path: ./src)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: /Users/enzo/Copy/projects/elevenyellow/coinfy/node_modules/instascan/package.json (relative path: ./src)
    resolve as module

Esta é a configuração que estou usando: https://github.com/Josema/preact-webpack-hmr