code: public static NamedConfigSource
      classpathResource(final String resourceBasename) {
  
          checkNotNull(resourceBasename);
  
          return new ClasspathResourceConfigSource(resourceBasename)
              .named(String.format("classpath: %s", resourceBasename));
      }
docs: A config source that loads Config from the classpath using
  {@code resourceBasename} as the name of the resource.
  
  <p>The {@link ClassLoader} and {@link ConfigParseOptions} parameters
  are retrieved from the {@link Bindings}. If either is not present,
  we defer to the defaults from the Config library.</p>
  
  <p>See
  {@code com.typesafe.config.ConfigFactory.parseResourcesAnySyntax}
  for further details.</p>