title: Reactjs -Heroku : Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/tokenize' is not defined by "exports" in /tmp/build_4dbbd649/
body: <pre><code>Here is my package.json exports and engines:
  
  &quot;engines&quot;: {
    &quot;node&quot;: &quot;12.14.1&quot;,
    &quot;npm&quot;: &quot;6.13.4&quot;
  },
  &quot;exports&quot;: {
    &quot;.&quot;: {
      &quot;require&quot;: &quot;./lib/postcss.js&quot;,
      &quot;import&quot;: &quot;./lib/postcss.mjs&quot;,
      &quot;types&quot;: &quot;./lib/postcss.d.ts&quot;
     },
   &quot;./lib/tokenize&quot;: &quot;./lib/tokenize.js&quot;,
   &quot;./*&quot;: &quot;./*&quot;
  },
  </code></pre>
  <p>After having this as my package.json engines and exports, my react app can't build on Heroku.
  I followed what others did for the same case but still not working.
  <strong>I REALLY NEED HELP WITH THIS</strong>.Anyone with an idea? Cheers.</p>