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GrowthBook Users

Hi everyone,
where in my nextjs app, am i supposed to set window.GROWTHBOOK_CONFIG for the visual editor?
I think the growthbook script is being called before the config is set.
Thanks in advance

useEffect(() =&gt; {
    const script = document.createElement('script');

    script.src = '<http://localhost:3100/js/prod_w1v5U4jkB0JKLtrm3Iq0Qid6IvBToU0BzS3GV5Q.js>';
    script.async = true;

    document.body.appendChild(script);
    window.GROWTHBOOK_CONFIG = {
      anonId: '123amiraliwerweafroghwowunbeleivab0980996,
      track: function (experimentId, variationId) {
        console.log('amirali', experimentId, variationId);
      },
    };

    return () =&gt; {
      document.body.removeChild(script);
    };
  }, []);

One thing: if i set userId instead of anonId, it will go and generate  a random id for me. I think there might be a problem in the script.