async function updateConfigFile()

in src/update.js [115:145]

• 26 lines of code
• 4 McCabe index (conditional complexity)

async function updateConfigFile(configPath, creds) {
  
  contents = await fs.promises.readFile(configPath, 'utf8')

  const regex = /(\/\/[a-zA-Z1-9-]+[-]npm[.]pkg[.]dev\/.*\/:_authToken=).*/g;
  const legacyRegex =
      /(\/\/[a-zA-Z1-9-]+[-]npm[.]pkg[.]dev\/.*\/:_password=).*(\n\/\/[a-zA-Z1-9-]+[-]npm[.]pkg[.]dev\/.*\/:username=oauth2accesstoken)/g;
  const prefixRegex = /\/\/[a-zA-Z1-9-]+[-]npm[.]pkg[.]dev\/.*\//;
  let newContents;
  // If config is basic auth, encrypt the token.
  if (contents.match(legacyRegex)) {
    encrypted_creds = Buffer.from(creds).toString('base64');
    newContents = contents.replace(legacyRegex, `$1"${encrypted_creds}"$2`);
    contents = newContents;
  }
  else if (!contents.match(regex)) {
    // _authToken may have been moved to user .npmrc but may now need to be used in local/project .npmrc
    // so if possible add back to local/project .npmrc
    const prefixMatch = contents.match(prefixRegex)
    if (prefixMatch) {
      contents = `${contents}\n${prefixMatch[0]}:_authToken=""`
    } else {
      throw new Error(
        'Artifact Registry config not found in ' + configPath +
        '\nRun `gcloud beta artifacts print-settings npm`.');
    }
  }
  newContents = contents.replace(regex, `$1"${creds}"`);
  const tempConfigPath = configPath.replace('.npmrc', '.npmrc-temp');
  await fs.promises.writeFile(configPath, newContents);
}