src/vs/workbench/contrib/extensions/browser/extensionsViewer.ts/ExtensionData/constructor
class ExtensionData:	constructor(extension: IExtension, parent: IExtensionData | null, getChildrenExtensionIds: (extension: IExtension) => string[], extensionsWorkbenchService: IExtensionsWorkbenchService) {
		this.extension = extension;
		this.parent = parent;
		this.getChildrenExtensionIds = getChildrenExtensionIds;
		this.extensionsWorkbenchService = extensionsWorkbenchService;
		this.childrenExtensionIds = this.getChildrenExtensionIds(extension);
	}