extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts/BufferSynchronizer/close
class BufferSynchronizer:	public close(resource: vscode.Uri, filepath: string): boolean {
		if (this.supportsBatching) {
			return this.updatePending(resource, new CloseOperation(filepath));
		} else {
			const args: Proto.FileRequestArgs = { file: filepath };
			this.client.executeWithoutWaitingForResponse('close', args);
			return true;
		}
	}