TypeScript: Why Does My Generic Function scenarios to Recognize Object Properties?
I've hit a wall trying to I've searched everywhere and can't find a clear answer. I'm trying to configure Hey everyone, I'm running into an issue that's driving me crazy... I've been working on this all day and I'm having a hard time understanding I'm relatively new to this, so bear with me. I'm working with an scenario with a generic function in TypeScript where it seems unable to properly infer the properties of an object being passed into it. I have a simple function designed to merge two generic objects, but when I call it with a specific type, TypeScript throws an behavior indicating that the properties are not recognized. Here's the code I have: ```typescript interface User { id: number; name: string; age?: number; } function merge<T>(obj1: T, obj2: T): T { return { ...obj1, ...obj2 }; } const user1: User = { id: 1, name: 'Alice' }; const user2: User = { id: 1, name: 'Alice', age: 30 }; const mergedUser = merge(user1, user2); console.log(mergedUser); ``` When I run this code, I get the following behavior: ``` Argument of type 'User' is not assignable to parameter of type 'T'. Property 'age' is missing in type 'User' but required in type 'T'. ``` I've tried specifying the generic type in various ways, such as using `<User>` when calling the function, but that just leads to more type issues. I am using TypeScript 4.5.2. Any advice on how to resolve this would be greatly appreciated. Is there something wrong with the way I've defined my generic function, or is there a better approach to merging objects of a specific type without running into these type inference issues? Has anyone else encountered this? For context: I'm using Typescript on CentOS. This is happening in both development and production on macOS. What's the best practice here? Could someone point me to the right documentation? The stack includes Typescript and several other technologies.