src/language-js/print/html-binding.js/isVueEventBindingExpression
function isVueEventBindingExpression(node) {
  switch (node.type) {
    case "MemberExpression":
      switch (node.property.type) {
        case "Identifier":
        case "NumericLiteral":
        case "StringLiteral":
          return isVueEventBindingExpression(node.object);
      }
      return false;
    case "Identifier":
      return true;
    default:
      return false;
  }
}