const coach = require('coach-core');
  
// Get the JavaScript code that will analyse a page
const domAdviceJavaScript = await coach.getDomAdvice();
// Take the *domAdviceJavaScript* and run it in your browser and take care of the result.
const domResult = ...

const har = // we get the HAR from a browser

// If your HARhar contains multiple pages (multiple runs etc) you can use the API
// to get the page that you want
const firstPageHar = coach.pickAPage(har, 0);

const harResult = await coach.analyseHar(firstPageHar);

// Say that you got the result from the browser in domAdviceResult
// and the HAR result in harAdviceResult
const coachResult = coach.merge(domResult, harResult);