src/vs/platform/userDataSync/common/abstractSynchronizer.ts/AbstractSynchroniser/getUserData
class AbstractSynchroniser:	private async getUserData(lastSyncData: IRemoteUserData | null): Promise<IUserData> {
		const lastSyncUserData: IUserData | null = lastSyncData ? { ref: lastSyncData.ref, content: lastSyncData.syncData ? JSON.stringify(lastSyncData.syncData) : null } : null;
		return this.userDataSyncStoreService.readResource(this.resource, lastSyncUserData, this.collection, this.syncHeaders);
	}