Determine the return type of a function based on a key parameter in an interface

Here is an example of a specific interface:

interface Elements {
   divContainer: HTMLDivElement;
   inputUpload: HTMLInputElement;
}

My goal is to create a function that can retrieve elements based on their names:

getElement(name: keyof Elements): Elements[name] {
    // Code to fetch the specified element.
}

const div = getElement("divContainer"); // This should return HTMLDivElement
const input = getElement("inputElement"); // This should return HTMLInputElement

However, I encountered an issue where I couldn't use the parameter as a type for the return value. I've experimented with Parameters, but haven't been successful in resolving this problem.

Answer №2

The parameter cannot be utilized as a return type.

Therefore, utilize its type instead:

fetchElement(tag: keyof Tags): Tags[typeof tag] {
    // Implementation to retrieve the element.
}

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