Robert Mirro robertmirro

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

The final result: require() any module on npm in your browser console with browserify

This article is written to explain how the above gif works in the chrome (and other) browser consoles. A quick disclaimer: this whole thing is a huge hack, it shouldn't be used for anything seriously, and there are probably much better ways of accomplishing the same.

Update: There are much better ways of accomplishing the same, and the script has been updated to use a much simpler method pulling directly from browserify-cdn. See this thread for details: mathisonian/requirify#5

inspiration

Chrome exhibits behavior different from firefox (and other javascript environments) in that console.log requires "this" to be console. This issue is discussed here.

Simple failing code is

var helloWorld = function(callback) { 
  callback("Hello World"); 
}; 
helloWorld(console.log);

The included snippet makes failing code function correctly without any other changes required. It just has to be run before any console.logs. Similar code can be written for console.info and so on.

stopBefore.js

2min screencast

Examples

stopBefore(document, 'getElementById')
stopBefore('document.getElementById') // the same as the previous
stopBefore(Element.prototype, 'removeChild')

	console.log(1);
	(_ => console.log(2))();
	eval('console.log(3);');
	console.log.call(null, 4);
	console.log.apply(null, [5]);
	new Function('console.log(6)')();
	Reflect.apply(console.log, null, [7])
	Reflect.construct(function(){console.log(8)}, []);
	Function.prototype.apply.call(console.log, null, [9]);
	Function.prototype.call.call(console.log, null, 10);

	function throttle(callback, wait, immediate = false) {
	let timeout = null
	let initialCall = true

	return function() {
	const callNow = immediate && initialCall
	const next = () => {
	callback.apply(this, arguments)
	timeout = null
	}

	function mapValues(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	result[key] = fn(obj[key], key);
	return result;
	}, {});
	}

	function pick(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	if (fn(obj[key])) {

	function

	foo(x,y) {
	return x * y;
	}

	foo(3,5); // 15

	// === Arrays

	var [a, b] = [1, 2];
	console.log(a, b);
	//=> 1 2


	// Use from functions, only select from pattern
	var foo = () => [1, 2, 3];

	@echo off
	SET st3Path=C:\Program Files\Sublime Text 3\sublime_text.exe

	rem add it for all file types
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3" /t REG_SZ /v "" /d "Open with Sublime Text 3" /f
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3" /t REG_EXPAND_SZ /v "Icon" /d "%st3Path%,0" /f
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3\command" /t REG_SZ /v "" /d "%st3Path% \"%%1\"" /f

	rem add it for folders
	@reg add "HKEY_CLASSES_ROOT\Folder\shell\Open with Sublime Text 3" /t REG_SZ /v "" /d "Open with Sublime Text 3" /f