text: const nunjucks = require('nunjucks');
  
  function createEnv(path, opts) {
      var
          autoescape = opts.autoescape === undefined ? true : opts.autoescape,
          noCache = opts.noCache || false,
          watch = opts.watch || false,
          throwOnUndefined = opts.throwOnUndefined || false,
          env = new nunjucks.Environment(
              new nunjucks.FileSystemLoader(path, {
                  noCache: noCache,
                  watch: watch,
              }), {
                  autoescape: autoescape,
                  throwOnUndefined: throwOnUndefined
              });
      if (opts.filters) {
          for (var f in opts.filters) {
              env.addFilter(f, opts.filters[f]);
          }
      }
      return env;
  }
  
  var env = createEnv('views', {
      watch: true,
      filters: {
          hex: function (n) {
              return '0x' + n.toString(16);
          }
      }
  });
  
  var s = env.render('hello.html', {
      name: '<Nunjucks>',
      fruits: ['Apple', 'Pear', 'Banana'],
      count: 12000
  });
  
  console.log(s);
  
  console.log(env.render('extend.html', {
      header: 'Hello',
      body: 'bla bla bla...'
  }));