.broilerplate.js

const myFeature = require("./src/config/workboxFeature");

addFeatures(
  ...,
  myFeature,
)

feature.js

// src/config/workboxFeature.js

const { OrderedSet, fromJS, List } = require("immutable");
const {
  createFeature,
  createPlugin
} = require("@dr-kobros/broilerplate/lib/extend");
const Plugin = require("workbox-webpack-plugin");
const path = require("path");

const workboxInjectPlugin = createPlugin(Plugin.InjectManifest)({
  name: () => "workboxInjectPlugin",
  isEnabled: (env, target) => target === "client",
  options: (env, target, paths) => {
    return List.of(
      fromJS({
        swSrc: path.resolve(paths.get("src"), "./sw.js")
      })
    );
  }
});

const workboxFeature = createFeature({
  name: () => "workboxFeature",
  loaders: () => OrderedSet.of(),
  plugins: () => OrderedSet.of(workboxInjectPlugin)
});

module.exports = workboxFeature;