[Flutter] How to check if XFile exists?

I want to check if a file exists before downloading it in flutter web and mobile, so using File class is not possible since it uses dart:io and dart:io in not available in web. now I want to use XFile class for handling files in both web and mobile.

For File we can use bool exists = await file.exists();

but there is no exists() method for XFile types. How can I check if a file already exits?

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