More specific type for acceptedFiles param

[luukvhoudt]

Small suggestion to improve the type of the acceptedFiles param.

In my project I use:

type NonEmptyArray<T = unknown> = [T, ...T[]];
type UniqueFileTypeSpecifier = `${string}/${string}` | `.${string}`;
type AcceptedFiles = UniqueFileTypeSpecifier | NonEmptyArray<UniqueFileTypeSpecifier>

Not perfect but it does at least give some indicator. I don't use the comma-separated feature but my type should also allow that.