src/vs/workbench/contrib/interactive/browser/interactiveDocumentService.ts/InteractiveDocumentService/willRemoveInteractiveDocument
class InteractiveDocumentService:	willRemoveInteractiveDocument(notebookUri: URI, inputUri: URI) {
		this._onWillRemoveInteractiveDocument.fire({
			notebookUri,
			inputUri
		});
	}