code: public boolean containsGlobalVariable(@Nullable final String name) {
      if (name == null) {
        return false;
      }
  
      final String normalized = assertNotNull(PreprocessorUtils.normalizeVariableName(name));
      if (normalized.isEmpty()) {
        return false;
      }
  
      return mapVariableNameToSpecialVarProcessor.containsKey(normalized) || globalVarTable.containsKey(normalized);
    }
docs: Check that there is a named global variable in the inside storage
  
  @param name the checking name, it will be normalized to the supported format, it can be null
  @return true if such variable is presented for its name in the inside storage, otherwise false (also it is false if the name is null)