Microsoft Edge File object missing lastModified

In version 1.3.0 File objects are converted to FormData improperly in MS Edge.

Recently File checking has been changed to (in https://github.com/therealparmesh/object-to-formdata/commit/bd1b2c6a46da594929f546e7595664631477be37):

 function isFile (value) {
-  return value instanceof File
+  return isBlob(value) &&
+      typeof value.lastModified === 'number' &&
+      typeof value.name === 'string'
 }

But in MS Edge File object doesn’t have lastModified property https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/4155006/, instead it has lastModifiedDate of ‘object’ type.

[piranna]

@piranna I’m not sure how I feel about using detection. I’m thinking that we should just do some tactical ||s to re-add support for Edge in the meantime.

I agree on that, it would not hurt. On the other hand, since FormData allow to use Blob objects, would be good to check if Edge support them too, so we would not need to worry about Edge or File objects anymore…

[therealparmesh]

The fix is in. Thank you!