Function writeFile

web/lib/kb.ts:212–218

(relPath: string, content: string)

/** 写单个文件（UTF-8）。调用者负责权限校验。 */
export async function writeFile(relPath: string, content: string): Promise<void> {
  const abs = safeResolve(relPath);
  // 写入前若文件已存在且是 symlink → 拒绝（避免覆盖项目外文件）
  assertNotSymlinkEscape(abs);
  await fsp.mkdir(path.dirname(abs), { recursive: true });
  await fsp.writeFile(abs, content, "utf8");
}

export async function fileExists(relPath: string): Promise<boolean> {
  try {