Add type definitions for Files And Directories API

Search Terms

"Files And Directories API" FileSystemFileEntry

Suggestion

Add types for the Files And Directories API: https://wicg.github.io/entries-api/

Specifically:

• FileSystemEntry
• FileSystemDirectoryEntry
• FileSystemDirectoryReader
• FileSystemFileEntry
• FileSystem

Use Cases

Handling drag/drop of multiple files and/or folders, and gleaning extra information about the dropped files (which is what the API provides).

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.