Attaching a function to window object in Webpack 5

Solution 1:

Try to add node.global: true to your config:

node: {
  global: true
}

DoneDel0's comment was the correct solution for me.

node: {
  global: true
}

The reasoning behind this is webpack 5 does no longer include a polyfills for node modules, so you have to manually set each.

https://webpack.js.org/configuration/node/#nodeglobal

However its good to note that the docs does suggest using ProvidePlugin instead of global.