Current Behavior

When running a webpack dev server, the webpack configuration is built with the "old" way by using withNx and withWeb even though isolatedConfig is set to true.
The main issue with that is that if a user return an immutable config from one of his plugins together with withNx and withWeb it will run them twice because processed is caching it by reference.

The following example will run withNx and withWeb twice, resulting in duplicated plugins and other invalid configurations:

import { merge } from 'webpack-merge'

const myPlugin: NxWebpackPlugin = (config) => {
  return merge(config, { node: { global: true }})
}

export default composePlugins(myPlugin, withNx(), withWeb(), withReact())

BTW - immutability is anyway an issue with the current tracking.

Expected Behavior

Should respect isolatedConfig in dev server too

Related Issue(s)

Fixes #