Config for esbuild in a Rails app

esbuild.js

const path = require("path");
const esbuild = require("esbuild");

esbuild
  .build({
    entryPoints: ["application.js"],
    bundle: true,
    outdir: path.join(process.cwd(), "app/assets/builds"),
    absWorkingDir: path.join(process.cwd(), "app/assets/packs"),
    minify: process.env.RAILS_ENV == "production",
    watch: process.argv.includes("--watch"),
    sourcemap: true,
    publicPath: "assets",
    plugins: [
      {
        name: "buildOutput",
        setup(build) {
          let time = 0
          build.onStart(() => { time = new Date().getTime()})
          build.onEnd(({errors}) => {
            if(errors.length) {
              console.error(`failed with ${errors.length} errors`)
            } else {
              console.log(`Done in ${new Date().getTime() - time}ms`);
            }
          })
        },
      }
    ],
  })
  .then(() => console.log("⚡JS ready"))
  .catch(() => process.exit(1));