DOM ready

app.js

// Example using the module.
import domready from "./domready.js";

domready(function() {
  //...
});

domready.js

// Runs `callback` once DOM has been loaded.
// Supported by IE9+ and modern browsers.
export default function(callback) {
  if(document.readyState === "complete") {
    callback();
  } else {
    document.addEventListener("DOMContentLoaded", callback);
  }
}

no-library.js

// Example without using the module.
function ready() {
  //...
}

if(document.readyState === "complete") {
  ready();
} else {
  document.addEventListener("DOMContentLoaded", ready);
}