Swig custom tag which depending on the argument escapes all var controls.

escapes.js

var swig = require('swig');

var source = '';

source += '{% escapes true %}';
source += '<li>{{ name }}</li>';
source += '{% endescapes %}';

swig.setTag('escapes', parse, compile, true, false);

console.log(swig.render(source));

function parse(str, line, parser, types) {
  parser.on(types.COMPARATOR, function (token) {
    if (this.isLast) {
      throw new Error('Unexpected logic "' + token.match + '" on line ' + line + '.');
    }
    if (this.prevToken.type === types.NOT) {
      throw new Error('Attempted logic "not ' + token.match + '" on line ' + line + '. Use !(foo ' + token.match + ') instead.');
    }
    this.out.push(token.match);
  });

  parser.on(types.NOT, function (token) {
    if (this.isLast) {
      throw new Error('Unexpected logic "' + token.match + '" on line ' + line + '.');
    }
    this.out.push(token.match);
  });

  parser.on(types.BOOL, function (token) {
    this.out.push(token.match);
  });

  parser.on(types.LOGIC, function (token) {
    if (!this.out.length || this.isLast) {
      throw new Error('Unexpected logic "' + token.match + '" on line ' + line + '.');
    }
    this.out.push(token.match);
    this.filterApplyIdx.pop();
  });

  return true;
};

function compile(compiler, args, content, parents, options, blockName) {
    return 'if (!' + args.join(' ') + ') {\n' +
             compiler(content, parents, options, blockName) + '\n' +
           '}';
};