src/vs/platform/files/browser/htmlFileSystemProvider.ts/HTMLFileSystemProvider/readFile
class HTMLFileSystemProvider:	async readFile(resource: URI): Promise<Uint8Array> {
		try {
			const handle = await this.getFileHandle(resource);
			if (!handle) {
				throw this.createFileSystemProviderError(resource, 'No such file or directory, readFile', FileSystemProviderErrorCode.FileNotFound);
			}

			const file = await handle.getFile();

			return new Uint8Array(await file.arrayBuffer());
		} catch (error) {
			throw this.toFileSystemProviderError(error);
		}
	}