Function createInstanceIdAllocator

packages/core/src/runtime/instance.ts:23–39

(startAt: InstanceId = 1)

 * Each call to allocate() returns the next sequential ID.
 */
export function createInstanceIdAllocator(startAt: InstanceId = 1): InstanceIdAllocator {
  if (!Number.isInteger(startAt) || startAt < 0) {
    throw new Error(
      `createInstanceIdAllocator: startAt must be an integer >= 0 (got ${String(startAt)})`,
    );
  }

  let next = startAt;

  return Object.freeze({
    allocate: () => {
      const id = next;
      next++;
      return id;
    },
  });
}