i have problem with my code, all i need is just to save results from looping api into json file using writeFileSync. Here’s my code:

function processRarity(limit) {
    var resultJson = [];
    for (var i = limit; i < limit + 100; i++) {
      const everything = async () => {
        const response = await fetch(
          "https://api-v2-mainnet.paras.id/token/asac.near::" + i
        );
        var json = await response.json();
        return json;
      };
      everything().then((res) => {
        console.log(res);
        resultJson = res;
      });
    }
    fs.writeFileSync(`${basePath}/results.json`, JSON.stringify(resultJson, null, 2));
}

when i check my json file, all i get is just:

[]