code: public static Config loadConfig(File configFile, boolean useSystemEnvironment) {
          return loadConfig(ConfigParseOptions.defaults(),
                  ConfigResolveOptions.defaults().setUseSystemEnvironment(useSystemEnvironment),
                  configFile);
      }
docs: Load, Parse & Resolve configurations from a file, with default parse & resolve options.
  
  @param configFile
  @param useSystemEnvironment
  {@code true} to resolve substitutions falling back to environment
  variables
  @return