How can I reliably determine if a browser supports the DataTransfer() constructor?

Question

I have a file uploader that uses new DataTransfer() to generate and display thumbnails for uploaded images. For Safari users, this constructor is not supported . The tricky part is that DataTransfer as a feature is supported - it's specifically the constructor that is not.

How can I detect if this feature exists, so that I can provide a standard file input for Safari users? To clarify, I'm not looking for help with the fallback - just the feature detection itself.

I attempted the following to no avail:

const isConstructor = (func) => (func && typeof func === "function" && func.prototype && func.prototype.constructor) === func;

isConstructor(DataTransfer);  //true in Safari

Answer 1

I was able to work around this, but in a somewhat hacky fashion that I'm not quite happy with. I'll still take any better answers I can get.

 let dataTransferConstructorSupported = false; try { new DataTransfer(), dataTransferConstructorSupported = true } catch {} console.log(dataTransferConstructorSupported);