excalidraw/src/excalidraw-app/app_constants.ts

// time constants (ms)
export const SAVE_TO_LOCAL_STORAGE_TIMEOUT = 300;
export const INITIAL_SCENE_UPDATE_TIMEOUT = 5000;
export const SYNC_FULL_SCENE_INTERVAL_MS = 20000;

export const BROADCAST = {
  SERVER_VOLATILE: "server-volatile-broadcast",
  SERVER: "server-broadcast",
};

export enum SCENE {
  INIT = "SCENE_INIT",
  UPDATE = "SCENE_UPDATE",
}