TypeScript - implementing inferring types from a generic function returning a Promise
I've tried everything I can think of but I'm prototyping a solution and I'm following best practices but Hey everyone, I'm running into an issue that's driving me crazy. I've searched everywhere and can't find a clear answer. I've been banging my head against this for hours. I'm currently working on a TypeScript project using version 4.5.2, and I have a generic function that fetches data from an API and returns a Promise. However, I'm working with issues with type inference for the return type of this function, especially when using it in different contexts. The function looks like this: ```typescript async function fetchData<T>(url: string): Promise<T> { const response = await fetch(url); if (!response.ok) { throw new behavior('Network response was not ok'); } return response.json(); } ``` When I'm trying to use this function in my components, I'm not able to get the correct type inference. For example, I want to fetch a list of users defined by the following interface: ```typescript interface User { id: number; name: string; email: string; } ``` When I call `fetchData<User>`, TypeScript doesn't seem to infer the return type correctly in some cases. Here’s how I’m using it: ```typescript const getUsers = async () => { const users = await fetchData<User>('https://api.example.com/users'); console.log(users); } getUsers(); ``` However, I get an behavior that states: `Argument of type 'Promise<User>' is not assignable to parameter of type 'User'`. This behavior appears intermittently depending on the context in which I call `getUsers()`. I have tried explicitly typing the return value of `getUsers` as `Promise<User[]>`, but that leads to similar issues. Is there a best practice for handling generics in this context, or is there something I'm missing about how TypeScript infers types from promises? Any guidance or examples would be greatly appreciated! My development environment is Windows. I'd really appreciate any guidance on this. I'd really appreciate any guidance on this. I'm working on a microservice that needs to handle this. Any suggestions would be helpful. What am I doing wrong? What's the best practice here? This is for a REST API running on Debian. What's the correct way to implement this?