import { readFile, writeFile } from "node:fs/promises";

export async function writeIfChanged(filePath: string, newContent: string): Promise<void> {
  try {
    const existing = await readFile(filePath, "utf-8");
    if (existing === newContent) {
      return;
    }
  } catch {
    // 文件不存在，创建
  }
  await writeFile(filePath, newContent);
}