EW-539 Add new types to realize nesting

Co-authored-by: Patrick Sachmann <[email protected]>

apps/server/src/modules/learnroom/common-cartridge/common-cartridge-organization-item-element.ts

@@ -8,10 +8,46 @@ export type ICommonCartridgeOrganizationProps = {
 	version: string;
 } & ({ children: ICommonCartridgeOrganizationProps[] } | { resources: ICommonCartridgeResourceProps[] });
 
+type OrganizationItemCollection = {
+	title: string;
+	children: OrganizationItemCollection[] | OrganizationResourceCollection;
+	_tag: 'itemCollection';
+};
+
+type OrganizationResourceCollection = {
+	identifier: string;
+	title: string;
+	version: string;
+	resources: ICommonCartridgeResourceProps[];
+	_tag: 'resourceCollection';
+};
+
+export type CommonCartridgeOrganizationItemElementProps = OrganizationItemCollection | OrganizationResourceCollection;
+
+function isOrganizationItemCollection(
+	item: CommonCartridgeOrganizationItemElementProps
+): item is OrganizationItemCollection {
+	return item._tag === 'itemCollection';
+}
+
+function isOrganizationResourceCollection(
+	item: CommonCartridgeOrganizationItemElementProps
+): item is OrganizationResourceCollection {
+	return item._tag === 'resourceCollection';
+}
+
 export class CommonCartridgeOrganizationItemElement implements ICommonCartridgeElement {
-	constructor(private readonly props: ICommonCartridgeOrganizationProps) {}
+	constructor(private readonly props: CommonCartridgeOrganizationItemElementProps) {}
 
 	transform(): Record<string, unknown> {
+		if (isOrganizationItemCollection(this.props)) {
+			return {};
+		}
+
+		if (isOrganizationResourceCollection(this.props)) {
+			return {};
+		}
+
 		return {
 			$: {
 				identifier: this.props.identifier,