[Bug?]: esbuild-plugin-pnp doesn't use module in package.json for libraries

Describe the bug

Even if in the building options of esbuild it’s define module in the mainFields the plugin use always (and only main). This will create some problem because when building in esm or iife usually library put the umd (or commonjs) version in main and the esm one in modules.

To reproduce

One of the library that has this configuration in the package.json is swr The following file can help to make a use case test

esbuild.js

const { pnpPlugin } = require('@yarnpkg/esbuild-plugin-pnp');
const esbuild = require('esbuild');

esbuild.build({
  entryPoints: {
    index: 'src/index.tsx',
    'index.html': 'src/index.html',
  },
  assetNames: '[name]',
  inject: ['./react-shim.js'],
  mainFields: ['module', 'main'],
  bundle: true,
  outdir: 'build',
  loader: {
    '.html': 'file',
    '.css': 'css',
  },
  plugins: [
    pnpPlugin(),
  ],
});

src/index.ts

import { render } from 'react-dom';
import useSWR from 'swr';

const App = () => {
  const result = useSWR('https://official-joke-api.appspot.com/random_joke');
  return (
    <section>
      <header>
        <h2>This is a test</h2>
      </header>
      <main>{result.data}</main>
    </section>
  );
};

render(<App />, document.querySelector('main'));

package.json

{
  "name": "esbuild-test",
  "sideEffects": false,
  "main": "build/index.js",
  "files": [
    "build"
  ],
  "scripts": {
    "build": "rm -rf build && yarn node esbuild.js"
  },
  "devDependencies": {
    "@types/react": "^17.0.13",
    "@types/react-dom": "^17",
    "@yarnpkg/esbuild-plugin-pnp": "^1.0.0-rc.13",
    "esbuild": "^0.12.16"
  },
  "dependencies": {
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "swr": "^0.5.6"
  }
}

Environment

OS: macOS browser: chrome, firefox

Additional context

No response

[huvber]

Can you please take a look at this? I think it will be a problem for a lot of projects

[merceyz]

Native support for PnP was added to esbuild@0.15.0 so @yarnpkg/esbuild-plugin-pnp is no longer required and is getting deprecated, if you experience any issues with the PnP support in esbuild please report them upstream.