I have a function that acts as a wrapper for the dynamic import() syntax:
async importWrapper(url) {
return await import(url);
}
Is there a way to make this function determine the return type based on the value of the url parameter?
I attempted:
async function importWrapper<T extends string>(url: T) : Promise<typeof import(T)> {
return await import(url);
}
but encountered an error:
Promise<typeof import(T)>
// ^^^--- TS1141 String literal expected
As of the latest TypeScript version 4.6, there is currently no way to represent "import types" using syntax like import(T) or typeof import(T).
An open feature request has been submitted on microsoft/TypeScript#44636, seeking community feedback on potentially incorporating this functionality. It's noted as "Awaiting Feedback," indicating a decision will depend on user responses. Consider showing your support by giving a thumbs up and explaining your use case along with why existing methods are inadequate.
Realistically, the chances of this feature being implemented soon, if at all, seem slim. A response from TS developer suggests it would require significant effort to implement. Such is life!
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