How to use the apicurio-data-models.CommandFactory.createChangeTitleCommand function in apicurio-data-models

public save(): void {
        this.editMode = false;
        console.info("[EditorTitleBarComponent] User changed the title to: " + this.newTitle);
        let command: ICommand = CommandFactory.createChangeTitleCommand(this.newTitle);
        this.commandService.emit(command);
    }

public cloneApi(): string {
        let sourceDoc: Document = this.document;
        CommandFactory.createChangeTitleCommand(this.title).execute(sourceDoc);
        if (sourceDoc.getDocumentType() == DocumentType.openapi2 && this.convertApi) {
            console.info("[CopyPageComponent] Converting API from 2.0 to 3.0.x!");
            sourceDoc = this.transformDocument(sourceDoc as Oas20Document);
        }
        let sourceJs: any = Library.writeNode(sourceDoc);
        let sourceStr: string = JSON.stringify(sourceJs);
        let sourceB64: string = Base64.encode(sourceStr);
        return sourceB64;
    }