Server

server.ts

export interface Change {
  base: string;
  changeId: string;
  patches: Patch[];
}

export class Server {
  clients: Client[] = [];

  id = v4();
  state: any = {};
  
  async onReceiveChange(client: Client, change: Change): Promise<"NOPE" | "ACK"> {
    if (change.base !== this.id) {
      console.log("[server] rejecting change; " + client.name + " is behind");
      return "NOPE";
    }
    this.state = applyPatches(this.state, change.patches);
    this.id = change.changeId;
    this.clients.filter(c => c !== client).forEach(c => c.onReceive(change));
    return "ACK";
  }
}