shoc-frontend-new/src/domain/work-orders/utils/merge-work-order-users.ts

import type { WorkOrderUser } from "@/domain/work-orders/types/work-order";

/** Primary list wins on id collision (dispatcher lookup before directory). */
export function mergeWorkOrderUsers(
  primary: WorkOrderUser[],
  extra: WorkOrderUser[],
): WorkOrderUser[] {
  const byId = new Map<string, WorkOrderUser>();
  for (const user of primary) {
    const key = String(user.id);
    if (key) byId.set(key, user);
  }
  for (const user of extra) {
    const key = String(user.id);
    if (key && !byId.has(key)) byId.set(key, user);
  }
  return [...byId.values()];
}