withDom.js

if (!global.document) {
  try {
    const jsdom = require('jsdom').jsdom; // could throw

    global.document = jsdom('');
    global.window = document.defaultView;
    Object.keys(document.defaultView).forEach((property) => {
      if (typeof global[property] === 'undefined') {
        global[property] = document.defaultView[property];
      }
    });

    global.navigator = {
      userAgent: 'node.js',
    };
  } catch (e) {
    // jsdom is not supported...
    if (e.message === "Cannot find module 'jsdom'") {
      console.error('[enzyme/withDom] Error: missing required module "jsdom"');
      console.error('[enzyme/withDom] To fix this you must run:');
      console.error('[enzyme/withDom]   npm install jsdom --save-dev');
    } else {
      console.error('[enzyme withDom] ' + (e.stack || e.message));
    }
  }
}