Csaba Palfi csabapalfi

Genomics - A programmer's guide.

Andy Thomason is a Senior Programmer at Genomics PLC. He has been witing graphics systems, games and compilers since the '70s and specialises in code performance.

https://www.genomicsplc.com

In this article, I would like to share three features of PageSpeed Insights (PSI), that is not easy to find in the official documentation. I discovered them while hacking on the Lighthouse plugin and integrating PSI to Treo.sh.

For a context, PSI is a simple yet powerful API by Google, that audits your page using Lighthouse and provides real-world users' data from Chrome UX Report (CrUX).

1. Audit many categories with one request

By default, PSI API returns only performance category. It's possible to pass ?category argument multiple times and get a report with many Lighthouse categories using one request (available categories: performance, accessibility, best-practices, seo, pwa).

curl -i "https://www.googleapis.com/pagespe

JavaScript File Format Differences

There's the pervarsive notion that all JS is created equal and that there's only minor and easily detectable differences between the various file formats used to author JavaScript. This is correct, from a certain point of view.

For many people writing JavaScript that gets passed into build tools,

As we were preparing Playwright 1.1.0, I learned quite a lot about Web Proxies. Below is the summary of my findings.

TIL: WEB Proxies

Reverse Web Proxy vs Forwarding Web Proxy

There are two groups of proxies that drive internet:

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

Deobfuscating / Unminifying Obfuscated Web App / JavaScript Code

	SELECT
	form_factor.name AS form_factor,
	cls.start,
	ROUND(SUM(cls.density), 4) AS density
	FROM
	`chrome-ux-report.all.201905`,
	UNNEST(experimental.cumulative_layout_shift.histogram.bin) AS cls
	WHERE
	origin = 'https://www.nytimes.com'
	GROUP BY

	const minute = 60;
	const hour = minute * 60;
	const day = hour * 24;
	const week = day * 7;
	const month = day * 30;
	const year = day * 365;

	/**
	* Convert a date to a relative time string, such as
	* "a minute ago", "in 2 hours", "yesterday", "3 months ago", etc.