Function saveConfig

src/utils/config.ts:1116–1145

(
  file: string,
  config: A,
  defaultConfig: A,
)

}

function saveConfig<A extends object>(
  file: string,
  config: A,
  defaultConfig: A,
): void {
  // Ensure the directory exists before writing the config file
  const dir = dirname(file)
  const fs = getFsImplementation()
  // mkdirSync is already recursive in FsOperations implementation
  fs.mkdirSync(dir)

  // Filter out any values that match the defaults
  const filteredConfig = pickBy(
    config,
    (value, key) =>
      jsonStringify(value) !== jsonStringify(defaultConfig[key as keyof A]),
  )
  // Write config file with secure permissions - mode only applies to new files
  writeFileSyncAndFlush_DEPRECATED(
    file,
    jsonStringify(filteredConfig, null, 2),
    {
      encoding: 'utf-8',
      mode: 0o600,
    },
  )
  if (file === getGlobalClaudeFile()) {
    globalConfigWriteCount++
  }
}

/**
 * Returns true if a write was performed; false if the write was skipped