src/dragdrop.ts
export const allow = (e: React.DragEvent<any>) => {
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
};
export const files = (e: React.DragEvent<any>): File[] => {
if (e.preventDefault) {
e.preventDefault();
}
return Array.from(e.dataTransfer.items).map(item => item.getAsFile() as File);
};