Error starting with custom webpack config

[mvosz]

I've configured my setup as described in the redme, except for one line ( webpackConfig: require('./webpack.config'), ) for custom webpack configuration file and recieved an error:

for(const module of chunk.modulesIterable)
TypeError: Cannot read property 'Symbol(Symbol.iterator)' of undefined

research resolves, it's a problem with yarn and the webpack-dev-server and it's recommended to install it with npm (webpack/webpack-dev-server#947), but stuck at the same error.

I'm using angular cli and extracted the webpack config with ng eject, use yarn instead of npm.

Any ideas?