declare namespace registryAuthToken {
  /**
   * The options for passing into `registry-auth-token`
   */
  interface AuthOptions {
    /**
     * Whether or not url's path parts are recursively trimmed from the registry
     * url when searching for tokens
     */
    recursive?: boolean | undefined;
    /**
     * An npmrc configuration object used when searching for tokens. If no object is provided,
     * the `.npmrc` file at the base of the project is used.
     */
    npmrc?:
      | {
          /**
           * A registry url used for matching
           */
          registry?: string | undefined;
          /**
           * Registry url's with token information
           */
          [registryUrls: string]: string | undefined;
        }
      | undefined;
  }
  /**
   * The generated authentication information
   */
  interface NpmCredentials {
    /**
     * The token representing the users credentials
     */
    token: string;
    /**
     * The type of token
     */
    type: 'Basic' | 'Bearer';
    /**
     * The username used in `Basic`
     */
    username?: string | undefined;
    /**
     * The password used in `Basic`
     */
    password?: string | undefined;
  }
}

/**
 * Retrieves the auth token to use for a given registry URL
 *
 * @param [registryUrl] - Either the registry url used for matching, or a configuration
 * object describing the contents of the .npmrc file. Uses default `registry` set in
 * `.npmrc` when argument is omitted.
 * @param [options] - a configuration object describing the
 * contents of the .npmrc file.  If an `npmrc` config object was passed in as the
 * first parameter, this parameter is ignored.
 * @returns The `NpmCredentials` object or undefined if no match found.
 */
declare function registryAuthToken(
  registryUrl?: string | registryAuthToken.AuthOptions,
  options?: registryAuthToken.AuthOptions
): registryAuthToken.NpmCredentials | undefined;

export = registryAuthToken;