src/vs/platform/files/common/fileService.ts/FileService/readFileBuffered
class FileService:	private readFileBuffered(provider: IFileSystemProviderWithOpenReadWriteCloseCapability, resource: URI, token: CancellationToken, options: IReadFileStreamOptions = Object.create(null)): VSBufferReadableStream {
		const stream = newWriteableBufferStream();

		readFileIntoStream(provider, resource, stream, data => data, {
			...options,
			bufferSize: this.BUFFER_SIZE,
			errorTransformer: error => new FileOperationError(localize('err.read', "Unable to read file '{0}' ({1})", this.resourceForError(resource), ensureFileSystemProviderError(error).toString()), toFileOperationResult(error), options)
		}, token);

		return stream;
	}