repl-bundler-plugin.ts

import * as rollup from "rollup";
// TODO: depend on these modules first party
import { nodeResolve } from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import type { ResourcePlugin } from "@greenwood/cli";

// function externalizeFsBuiltinRollupPlugin() {
//   return {
//     name: 'externalize-fs-builtin',
//     resolveId(source: string) {
//       if (source === 'fs') {
//         return source;
//       }
//       return null;
//     },
//     load(id: string) {
//       if (id === 'fs') {
//         return `
//           const noop = () => {};
//           const fs = {
//             readFileSync: noop,
//             promises: {
//               readFile: noop
//             }
//           }

//           export default fs;
//         `;
//       }
//       return null;
//     },
//   };
// }

class ReplBundlerResource {
  extensions: string[];

  constructor() {
    this.extensions = [];
  }

  async shouldIntercept(url: URL) {
    return url.pathname.endsWith("scripts/repl.ts");
  }

  async intercept(url: URL) {
    const bundle = await rollup.rollup({
      input: url.pathname,
      treeshake: false,
      plugins: [
        // externalizeFsBuiltinRollupPlugin(),
        nodeResolve(),
        commonjs(),
      ],
    });
    const { output } = await bundle.generate({
      format: "esm",
    });

    return new Response(output[0].code, {
      headers: {
        "Content-Type": "text/javascript",
      },
    });
  }
}

export function replBundlerResourcePlugin(): ResourcePlugin {
  return {
    type: "resource",
    name: "repl-bundler-resource-plugin",
    provider: () => new ReplBundlerResource(),
  };
}