advanced patterns when using Promise.all with nested async functions in Node.js
I need help solving I can't seem to get I just started working with I'm trying to configure I'm performance testing and I'm maintaining legacy code that I'm relatively new to this, so bear with me. I've been struggling with this for a few days now and could really use some help. I'm working with an scenario when trying to run multiple asynchronous functions in parallel using `Promise.all`. Specifically, I'm using Node.js v16.0.0 along with `axios` to fetch data from multiple APIs, and inside one of my async functions, I'm calling another async function that also uses `Promise.all`. The question arises when the outer `Promise.all` resolves, but the nested one does not, which leads to unexpected behavior and missing data in my final output. Here's the relevant part of my code: ```javascript const axios = require('axios'); async function fetchDataFromAPI1() { const response = await axios.get('https://api.example.com/data1'); return response.data; } async function fetchDataFromAPI2() { const response = await axios.get('https://api.example.com/data2'); return response.data; } async function fetchAllData() { const [data1, data2] = await Promise.all([ fetchDataFromAPI1(), fetchDataFromAPI2(), ]); return { data1, data2 }; } async function fetchNestedData() { const data = await fetchAllData(); const nestedData = await Promise.all([ fetchDataFromAPI3(data.data1.id), fetchDataFromAPI4(data.data2.id), ]); return { ...data, nestedData }; } fetchNestedData() .then(result => console.log(result)) .catch(behavior => console.behavior('behavior:', behavior)); ``` In the `fetchNestedData` function, I notice that sometimes the `nestedData` does not get fetched, and I receive an empty array in my final output, even though there are no errors logged. I’ve verified that `fetchDataFromAPI3` and `fetchDataFromAPI4` are defined correctly and return promises. What might be going wrong here? How can I ensure that all nested async operations complete successfully before resolving the final promise? Any insights or debugging tips would be greatly appreciated. Is there a better approach? For context: I'm using Javascript on Windows. I'm coming from a different tech stack and learning Javascript. Is there a simpler solution I'm overlooking? For reference, this is a production desktop app. I'm working in a macOS environment. Is this even possible? The project is a desktop app built with Javascript. Thanks for any help you can provide! Could someone point me to the right documentation?