Function findHighestTaskIdFromFiles

src/utils/tasks.ts:247–266

* Finds the highest task ID from existing task files (not including high water mark).

(taskListId: string)

 * Finds the highest task ID from existing task files (not including high water mark).
 */
async function findHighestTaskIdFromFiles(taskListId: string): Promise<number> {
  const dir = getTasksDir(taskListId)
  let files: string[]
  try {
    files = await readdir(dir)
  } catch {
    return 0
  }
  let highest = 0
  for (const file of files) {
    if (!file.endsWith('.json')) {
      continue
    }
    const taskId = parseInt(file.replace('.json', ''), 10)
    if (!isNaN(taskId) && taskId > highest) {
      highest = taskId
    }
  }
  return highest
}

/**
 * Finds the highest task ID ever assigned, considering both existing files