src/vs/platform/userDataSync/common/userDataSyncResourceProvider.ts/UserDataSyncResourceProviderService/resolveExtensionsNodeContent
class UserDataSyncResourceProviderService:	private resolveExtensionsNodeContent(syncData: ISyncData, node: string): string | null {
		switch (node) {
			case 'extensions.json':
				return stringifyExtensions(parseExtensions(syncData), true);
		}
		return null;
	}