Rolldown config with swc for advanced mangling and esbuild for minification

rolldown.config.js

// @ts-check
/** @import { RolldownOptions, OutputOptions, Plugin } from "rolldown" */
import isolatedDeclarations from "@unplugin/isolated-decl/rolldown"
import swc from "unplugin-swc"
import * as esbuild from "rollup-plugin-esbuild"

const /** @satisfies {OutputOptions} */ output = {
  chunkFileNames: "[name].js",
  sourcemap: true,
}

const /** @satisfies {RolldownOptions} */ module = {
  input: "./module.ts",
  output,
  plugins: [isolatedDeclarations({ transformer: "oxc" })],
}

const /** @satisfies {RolldownOptions} */ script = {
  input: "./script.ts",
  output,
  plugins: [
    swc.rolldown({
      tsconfigFile: "./deno.json",
      jsc: {
        target: "esnext",
        externalHelpers: true,
        transform: {
          constModules: {}, // TODO: inline error code
          optimizer: {
            simplify: true,
            globals: {
              vars: {},
              typeofs: {}, // NOTE: may make code readable and eliminate some helper in internal.js
            },
          },
          treatConstEnumAsEnum: false,
        },
        minify: {
          compress: {
            booleans_as_integers: true,
            reduce_funcs: true,
            unsafe: true,
          },
          mangle: {
            props: {
              reserved: [],
              undeclared: true,
              regex: /_$/.source,
            },
          },
        },
      },
    }),
    /** @type {Plugin} */ (esbuild.minify()),
  ],
}

export default [module, script]