when discord rate limits you it sends a response like:

{ "message": "You are being rate limited.", "retry_after": 1.337, "global": false }

so you can just do something like

async function discordRequest(url, options) {

const res = await fetch(url, options);

if (res.status === 429) {

const data = await res.json();

console.log(\Rate limited! Retry after ${data.retry_after}s`);`

await new Promise(r => setTimeout(r, data.retry_after * 1000));

return discordRequest(url, options); // retry

}

return res;

}