fix: fix FileWithPath inheritance and close #12

This should fix conflicts with Electron where they modify File and there's no way in Typescript to force File to be imported from 'dom'.  Since typescript is structural this should work just fine.

Author: burtonator

src/file.ts

@@ -37,7 +37,12 @@ export function toFileWithPath(file: FileWithPath, path?: string): FileWithPath
     return f;
 }
 
-export interface FileWithPath extends File {
+interface DOMFile extends Blob {
+    readonly lastModified: number;
+    readonly name: string;
+}
+
+export interface FileWithPath extends DOMFile {
     readonly path?: string;
 }