Progressive Web Apps with React

Logging the results

The results variable comes in as an object. It gives a detailed breakdown of each category with the score given, but we only care about trouble areas. Above our function invocation, let's add a score cutoff:

const CUTOFF = 90launchChromeAndRunLighthouse('http://localhost:5000', {}).then(results => {

We'll use this to say "only show results that score less than 90/100."

The process of logging out the results isn't too exciting, so we won't walk through it here in depth. Here's the complete file:

const serve = require('serve');const lighthouse = require('lighthouse');const chromeLauncher = require('lighthouse/chrome-launcher');function launchChromeAndRunLighthouse(url, flags = {}, config = null) { return chromeLauncher.launch().then(chrome ...