deno-rollup

import { rollup } from "https://deno.land/x/drollup@2.38.4+0.8.0/mod.ts";

const options = {
  input: "./mod.ts",
  output: {
    dir: "./dist",
    format: "es" as const,
    sourcemap: true,
  },
};

const bundle = await rollup(options);
await bundle.write(options.output);
await bundle.close();

import { watch } from "https://deno.land/x/drollup@2.38.4+0.8.0/mod.ts";

const options = {
  input: "./src/mod.ts",
  output: {
    dir: "./dist",
    format: "es" as const,
    sourcemap: true,
  },
  watch: {
    include: ["src/**"],
  },
};

const watcher = await watch(options);

watcher.on("event", (event) => {
  // event.code can be one of:
  //   START        — the watcher is (re)starting
  //   BUNDLE_START — building an individual bundle
  //                  * event.input will be the input options object if present
  //                  * event.outputFiles cantains an array of the "file" or
  //                    "dir" option values of the generated outputs
  //   BUNDLE_END   — finished building a bundle
  //                  * event.input will be the input options object if present
  //                  * event.outputFiles cantains an array of the "file" or
  //                    "dir" option values of the generated outputs
  //                  * event.duration is the build duration in milliseconds
  //                  * event.result contains the bundle object that can be
  //                    used to generate additional outputs by calling
  //                    bundle.generate or bundle.write. This is especially
  //                    important when the watch.skipWrite option is used.
  //                  You should call "event.result.close()" once you are done
  //                  generating outputs, or if you do not generate outputs.
  //                  This will allow plugins to clean up resources via the
  //                  "closeBundle" hook.
  //   END          — finished building all bundles
  //   ERROR        — encountered an error while bundling
  //                  * event.error contains the error that was thrown
});

// This will make sure that bundles are properly closed after each run
watcher.on("event", (event) => {
  if (event.code === "BUNDLE_END") {
    event.result.close();
  }
});

// stop watching
watcher.close();