Function writeConfigField

packages/config/src/loader.ts:114–149

(section: string, key: string, value: string | number | boolean)

 * 采用简单的 TOML 序列化：仅支持一级 section + 字符串/数字值。
 */
export function writeConfigField(section: string, key: string, value: string | number | boolean): void {
  if (!fs.existsSync(CONFIG_DIR)) {
    fs.mkdirSync(CONFIG_DIR, { recursive: true })
  }

  let existing: Record<string, Record<string, unknown>> = {}
  if (fs.existsSync(CONFIG_TOML)) {
    try {
      const content = fs.readFileSync(CONFIG_TOML, 'utf-8')
      existing = parseToml(content) as Record<string, Record<string, unknown>>
    } catch {
      // 解析失败时从空开始，旧文件会被覆盖
    }
  }

  if (!existing[section] || typeof existing[section] !== 'object') {
    existing[section] = {}
  }
  existing[section][key] = value

  const lines: string[] = []
  for (const [sec, entries] of Object.entries(existing)) {
    if (typeof entries !== 'object' || entries === null) continue
    lines.push(`[${sec}]`)
    for (const [k, v] of Object.entries(entries as Record<string, unknown>)) {
      if (typeof v === 'string') {
        lines.push(`${k} = ${JSON.stringify(v)}`)
      } else if (typeof v === 'number' || typeof v === 'boolean') {
        lines.push(`${k} = ${v}`)
      }
    }
    lines.push('')
  }

  fs.writeFileSync(CONFIG_TOML, lines.join('\n'), 'utf-8')
}

function deepMerge(base: Record<string, unknown>, override: Record<string, unknown>): Record<string, unknown> {
  const result = { ...base }