Legacy Node.js app failing on IE11 - Issues with Promise-based code
I recently switched to Recently started working with a legacy Node.js application that needs to support cross-browser functionality, particularly Internet Explorer 11... The project was initially built using ES6 features, and for the most part, it runs smoothly on modern browsers. However, the use of Promises and async/await in the Node.js backend appears to be causing issues when requests are processed by clients using IE11. In particular, here's a simplified example of a function that returns a Promise: ```javascript function fetchData() { return new Promise((resolve, reject) => { setTimeout(() => { resolve('Data fetched successfully!'); }, 1000); }); } ``` When I try to call this function in a route handler, the response seems to hang indefinitely on IE11, while it works perfectly fine in Chrome and Firefox. Here's how I am currently using it: ```javascript app.get('/api/data', async (req, res) => { try { const data = await fetchData(); res.json({ message: data }); } catch (error) { res.status(500).json({ error: 'Internal Server Error' }); } }); ``` I've confirmed the fetch function is being called, but the response never reaches the client. As a temporary workaround, I tried using callback functions instead, but that approach feels outdated and defeats the purpose of clean, readable code. I also checked compatibility of promises and async/await with IE11 and found that it does not support them natively. To handle this, I included a polyfill, which I loaded with: ```html <script src='https://cdnjs.cloudflare.com/ajax/libs/es6-promise/4.2.8/es6-promise.auto.min.js'></script> ``` Despite this, the issue persists. Additionally, I wonder if there are any specific configurations needed in the Node.js backend or the way promises are handled in Express that could improve compatibility. Any guidance on adjusting the code or additional polyfills that could help ensure functionality across all browsers would be greatly appreciated. Thanks! For context: I'm using Javascript on Windows 10. Has anyone else encountered this? What are your experiences with this?