builder.js not firing.

[winston0410]

I found out that builder.js is not firing, thus I cannot get the service-worker.js. I have made some changes to .eleventy.js, in order to make it works again and easier to read.

const shimmer = require("shimmer");
const swBuild = require("./src/builder.js");

module.exports = {
  configFunction: (__, options = {}) => {
    console.log('PWA running');
    function postBuild() {
      const Eleventy = require("@11ty/eleventy/src/Eleventy");
      shimmer.wrap(Eleventy.prototype, "finish", function(orig) {
        const outputDir = new Eleventy().outputDir;
        process.on("unhandledRejection", (reason) => {
          console.log("Reason: " + reason);
        });
        return swBuild(options, outputDir).then((res) => console.log(res));

      });
    }
    setImmediate(postBuild);
  }
};

It will be great if you can update the code for the next version. Thanks.