Use nunchucks to render a precompiled template that doesn't require a `window` object or any global variables.

nunjucks.ts

// requires deno > 1.25.1
// deno run --allow-env --unstable nunjucks.ts 

import nunjucks from "npm:nunjucks";

// we use nunjucks itself to create the wrapper function
let wrapperFn = nunjucks.compile(`
(function() {
  return function appendTemplates(precompiled) {
  {% for template in templates %}
    precompiled["{{template.name | safe}}"] = (function() { {{template.template | safe}} })()
  {% endfor %}
  return precompiled;
  }
})();
`);

let wrapper = templates => wrapperFn.render({ templates });

// define the "salutations" module which has a `greet()` macro
let greet = nunjucks.precompileString(`
{% macro greet(name) %}
Hello {{name}}
{% endmacro %}
`, {
  name: "salutations",
  wrapper,
});

// use the greet macro
let hello = nunjucks.precompileString(`
{% from "salutations" import greet %}
{{greet(name)}}
`, {
  name: "hello.tmpl",
  wrapper,
});

let precompiled = {};

//our custom wrapper returns a function that receives the record
//of global template modules.
eval(greet)(precompiled);
eval(hello)(precompiled);

let environment = new nunjucks.Environment([new nunjucks.PrecompiledLoader(precompiled)])

console.log(environment.render("hello.tmpl", { name: "Charles "}));