src/vs/platform/userDataSync/common/abstractSynchronizer.ts/AbstractSynchroniser/readLastSyncStoredRemoteUserData
class AbstractSynchroniser:	private async readLastSyncStoredRemoteUserData(): Promise<IRemoteUserData | undefined> {
		const content = (await this.fileService.readFile(this.lastSyncResource)).value.toString();
		try {
			const lastSyncStoredRemoteUserData = content ? JSON.parse(content) : undefined;
			if (isRemoteUserData(lastSyncStoredRemoteUserData)) {
				return lastSyncStoredRemoteUserData;
			}
		} catch (e) {
			this.logService.error(e);
		}
		return undefined;
	}