survivejs/webpack

Thanks for writing such approachable and yet deep treatment of Webpack! Are you planning on releasing an update when Webpack 5 comes out? And, of course, an obligatory cry for help: is there a way to load a partial config based on what npm command was executed? Without touching the content of package.json. Code example will help me to illustrate what I'm on about.

// webpack.config.js
require('dotenv/config')
const merge = require('webpack-merge')

const { NODE_ENV = 'production' } = process.env

const {
  watch,
} = require('./webpack-parts')

/* TODO: watch only when npm start is executed */
const developmentConfig = merge([
  watch(),
])

module.exports = (mode = NODE_ENV) => {
  if (mode === 'production') {
    return merge(commonConfig, productionConfig, { mode })
  }
  return merge(commonConfig, developmentConfig, { mode })
}

// watch.js
exports.watch = ({ aggregateTimeout, poll, ignored } = {}) => ({
  watch: true,
  watchOptions: {
    aggregateTimeout,
    poll,
    ignored,
  },
})

I'm trying to get the watch.js partial to run only if preceding it command was npm start, and stay dormant / off if its npm run build or anything else. I know that I could do this easily via package.json, just trying to figure out if the same behaviour can be achieved via webpack config only.