feat: sync implementation for the user entity (#16234)

* ci: print out typeorm generation changes

* feat: sync implementation for the user entity

wip

---------

Co-authored-by: Jason Rasmussen <jason@rasm.me>

server/src/utils/sync.ts

@@ -0,0 +1,30 @@
+import { SyncItem } from 'src/dtos/sync.dto';
+import { SyncEntityType } from 'src/enum';
+import { SyncAck } from 'src/types';
+
+type Impossible<K extends keyof any> = {
+  [P in K]: never;
+};
+
+type Exact<T, U extends T = T> = U & Impossible<Exclude<keyof U, keyof T>>;
+
+export const fromAck = (ack: string): SyncAck => {
+  const [type, timestamp, ...ids] = ack.split('|');
+  return { type: type as SyncEntityType, ackEpoch: timestamp, ids };
+};
+
+export const toAck = ({ type, ackEpoch, ids }: SyncAck) => [type, ackEpoch, ...ids].join('|');
+
+export const mapJsonLine = (object: unknown) => JSON.stringify(object) + '\n';
+
+export const serialize = <T extends keyof SyncItem, D extends SyncItem[T]>({
+  type,
+  ackEpoch,
+  ids,
+  data,
+}: {
+  type: T;
+  ackEpoch: string;
+  ids: string[];
+  data: Exact<SyncItem[T], D>;
+}) => mapJsonLine({ type, data, ack: toAck({ type, ackEpoch, ids }) });