title: Copy assets of library with Yarn Plug'n'Play
body: <p>I have codes to copy assets when building. I'm wondering what's the best way to do the same thing with <a href="https://github.com/yarnpkg/rfcs/pull/101" rel="noreferrer">Yarn Plug'n'Play</a> since node_modules does not exist. </p>
  
  <pre><code>new CopyWebpackPlugin([
    { from: 'node_modules/pdfjs-dist/cmaps/', to: 'static/cmaps/' },
  ]),
  </code></pre>
  
  <p><code>yarn cache dir</code> tells me the directory and also there's a package location in <code>.pnp.js</code>. </p>
  
  <pre><code>  ["pdfjs-dist", new Map([
      ["2.0.943", {
        packageLocation: path.resolve(__dirname, "../../Library/Caches/Yarn/v3/npm-pdfjs-dist-2.0.943-32fb9a2d863df5a1d89521a0b3cd900c16e7edde/node_modules/pdfjs-dist/"),
  </code></pre>
  
  <p>Should I somehow parse the file and copy as I did before? Or is there better way? </p>