Anton Karlovskiy anton-karlovskiy

Web Page Usability Matters
PageSpeed Insights w/Lighthouse and Chrome User Experience Report
Data Saver for Chrome on Android - enable and then look at about:flags for Lite Pages and other interventions
web.dev/fast - code-labs and tooling for optimizing performance
Lighthousebot for using Lighthouse in continuous integration
Bundlesize for JavaScript budgets in CI
Start performance budgeting

Workbox runtime caching recipes

Your Service Worker script will need to import in Workbox and initialize it before calling any of the routes documented in this write-up, similar to the below:

importScripts('workbox-sw.prod.v1.3.0.js');
const workbox = new WorkboxSW();

// Placeholder array populated automatically by workboxBuild.injectManifest()

	// array utils
	// =================================================================================================

	const combine = (...arrays) => [].concat(...arrays);

	const compact = arr => arr.filter(Boolean);

	const contains = (() => Array.prototype.includes
	? (arr, value) => arr.includes(value)
	: (arr, value) => arr.some(el => el === value)

	const fetchAsBlob = url => fetch(url).then(response => response.blob());

	const convertBlobToBase64 = blob => new Promise((resolve, reject) => {
	const reader = new FileReader();
	reader.onerror = reject;
	reader.onload = () => {
	resolve(reader.result);
	};
	reader.readAsDataURL(blob);
	});