src/vs/workbench/services/themes/common/workbenchThemeService.ts/toJSONObject
	export function toJSONObject(d: ExtensionData | undefined): any {
		return d && { _extensionId: d.extensionId, _extensionIsBuiltin: d.extensionIsBuiltin, _extensionName: d.extensionName, _extensionPublisher: d.extensionPublisher };
	}