src/vs/platform/files/browser/indexedDBFileSystemProvider.ts/IndexedDBFileSystemProvider/mkdir
class IndexedDBFileSystemProvider:	async mkdir(resource: URI): Promise<void> {
		try {
			const resourceStat = await this.stat(resource);
			if (resourceStat.type === FileType.File) {
				throw ERR_FILE_NOT_DIR;
			}
		} catch (error) { /* Ignore */ }
		(await this.getFiletree()).add(resource.path, { type: 'dir' });
	}