Why do I keep being told that the property doesn't exist?

I have the following code in one file:

function test<T extends {}>(arg:T):any {
  return arg.name
}

In another file, I have this code:

interface IItem  {
    name: string
}

console.log(test<IItem>({name:'3'}))

When I try to access the name property of the args object, why do I encounter an error? It is not feasible to declare the interface in a file with the test function.

Answer №1

The extension of {} raises the possibility that it may lack a name property, or any properties altogether.

To address this concern, you could try the following approach:

function check<T extends { name: string }>(input: T): any {
// function test<T extends IItem>(arg: T): any {
    return input.name
}

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