code: private boolean isSimpleVueJsExpression(String expressionString) {
      String methodName = expressionString;
      if (expressionString.endsWith("()")) {
        methodName = expressionString.substring(0, expressionString.length() - 2);
      }
  
      return context.hasMethod(methodName);
    }
docs: In some case the expression is already a valid Vue.js expression that will work without any
  processing. In this case we just leave it in place. This avoid creating Computed
  properties/methods for simple expressions.
  
  @param expressionString The expression to check
  @return true if it's already a valid Vue.js expression, false otherwise