react_ujs/react_ujs/src/getConstructor/fromGlobal.js

Rails UJS for the react-rails gem

// Assume className is simple and can be found at top-level (window).
// Fallback to eval to handle cases like 'My.React.ComponentName'.
// Also, try to gracefully import Babel 6 style default exports
var topLevel = typeof window === "undefined" ? this : window;

module.exports = function(className) {
  var constructor;
  // Try to access the class globally first
  constructor = topLevel[className];

  // If that didn't work, try eval
  if (!constructor) {
    constructor = eval(className);
  }

  // Lastly, if there is a default attribute try that
  if (constructor && constructor['default']) {
    constructor = constructor['default'];
  }

  return constructor;
}