src/vs/platform/files/common/inMemoryFilesystemProvider.ts/InMemoryFileSystemProvider/readdir
class InMemoryFileSystemProvider:	async readdir(resource: URI): Promise<[string, FileType][]> {
		const entry = this._lookupAsDirectory(resource, false);
		let result: [string, FileType][] = [];
		entry.entries.forEach((child, name) => result.push([name, child.type]));
		return result;
	}