The issue with passing functions to loaders in webpack2

fooLoader.js

module.exports = function (source) {
  console.log(this.query) // { foo: [null] } -- this is because when it's json serialized, it nulls out functions
  const realOptions = this.options.module.rules.reduce((m, r) => {
    const fooLoaderUse = r.use.find((u) => u.loader === 'foo-loader')
    return fooLoaderUse ? fooLoaderUse.options : m
  }, null)
  console.log(realOptions) // foo: [() => 'bar'] -- it works, but is v. ugly
}

webpack.config.js

module.exports = {
 module: {
   rules: [
     test: /\.foo$/,
     use: [{ loader: 'foo-loader', options: { foo: [() => 'bar'] } }]
   ]
 }
}