text: const printJS = require("./util/printJS");
  
  module.exports = function migrator(oldNode, context) {
    const attributes = oldNode.attributes;
    const argument = oldNode.argument;
  
    context.deprecate('The "<unless(x)>" tag is deprecated. Please use "<if(!x)>" instead. See: https://github.com/marko-js/marko/wiki/Deprecation:-unless-tag');
    if (!argument) {
      context.addError("Invalid <unless> tag. Argument is missing. Example; <unless(foo === true)>");
      return oldNode;
    }
    if (attributes.length) {
      context.addError("Invalid <unless> tag. Attributes not allowed.");
      return oldNode;
    }
  
    const builder = context.builder;
    const newNode = builder.htmlElement("if", undefined, [], printJS(builder.negate(argument), context), false, false);
  
    oldNode.moveChildrenTo(newNode);
    oldNode.replaceWith(newNode);
  };