marko/dist/express.js

require("./");

var express = module.parent ? module.parent.require("express") : require("express");

patchResponse(express.response);
delete require.cache[__filename];

module.exports = function markoAppMiddleware() {
  var sacrificialApp = express();

  sacrificialApp.once("mount", function onmount(parent) {
    // Patch the response
    patchResponse(parent.response);

    // Remove sacrificial express app
    if (parent._router) {
      // Support Express <= 4.x
      parent._router.stack.pop();
    } else {
      // Support express 5.x
      parent.router.stack.pop();
    }
  });

  return sacrificialApp;
};

function patchResponse(response) {
  response.marko = response.marko || function (template, data) {
    if (typeof template === "string") {
      throw new Error("res.marko does not take a template name or path like res.render.  " + "Instead you should use `require('./path/to/template.marko')` " + "and pass the loaded template to this function.");
    }

    var res = this;
    var req = res.req;
    var app = res.app;
    var $global = Object.assign({ app, req, res }, app.locals, res.locals);

    if (data) {
      data = Object.assign(data, {
        $global: Object.assign($global, data.$global)
      });
    } else {
      data = { $global };
    }

    res.set({ "content-type": "text/html; charset=utf-8" });
    return template.render(data, res).on("error", req.next);
  };
}