src/vs/workbench/api/browser/mainThreadInteractive.ts/MainThreadInteractive/constructor
class MainThreadInteractive:	constructor(
		extHostContext: IExtHostContext,
		@IInteractiveDocumentService interactiveDocumentService: IInteractiveDocumentService
	) {
		this._proxy = extHostContext.getProxy(ExtHostContext.ExtHostInteractive);

		this._disposables.add(interactiveDocumentService.onWillAddInteractiveDocument((e) => {
			this._proxy.$willAddInteractiveDocument(e.inputUri, '\n', PLAINTEXT_LANGUAGE_ID, e.notebookUri);
		}));

		this._disposables.add(interactiveDocumentService.onWillRemoveInteractiveDocument((e) => {
			this._proxy.$willRemoveInteractiveDocument(e.inputUri, e.notebookUri);
		}));
	}