Jonathan Neal jonathantneal

CSS Container Queries Notes

If the target rule represents a style rule;
If the target rule style contains a fallback contain property; 1. If the fallback contain property represents a layout container;
1. For each element matching the selector of the target rule;
2. Add the element to the list of layout containers, then;
Add a fallback layout containment rule for that specific element.

Install Command Line Tools for macOS:

xcode-select --install

	import { existsSync } from 'fs'
	import { readFile } from 'fs/promises'
	import { transform } from 'esbuild'

	/** @typedef {{ conditions: string[], parentURL: string }} Context */
	/** @typedef {(specifier: string, context: Context, defaultResolve: ResolveHook) => { url: string }} ResolveHook */
	/** @typedef {(url: string, context: Context, defaultGetFormat: GetFormatHook) => { format: string }} GetFormatHook */
	/** @typedef {(url: string, context: Context, defaultGetSource: GetSourceHook) => Promise<{ source: string \| SharedArrayBuffer \| Uint8Array }>} GetSourceHook */

	/** Matches any JavaScript/TypeScript module. */

	try {
	new CSSStyleSheet()
	} catch {
	CSSStyleSheet = ((
	stylePtt = CSSStyleSheet.prototype,
	styleDoc = new Document(),
	styleDom = styleDoc.appendChild(document.createElement('style')),
	sheet
	) => Object.assign(stylePtt.constructor = function CSSStyleSheet() {
	if (!new.target) {

	/** Observes stylesheet lists and runs a callback whenever it encounteres added or removed stylesheets. */
	export const createStyleSheetObserver = (/** @type {(addedSheets?: CSSStyleSheet[], removedSheets?: CSSStyleSheet[]) => void} */ callback) => {
	/** @type {Set<StyleSheetList>} Observed style sheet lists. */
	const sheetLists = new Set
	/** @type {Set<CSSStyleSheet>} Previously observed style sheets. */
	let lastSheets = new Set
	/** Observes style sheet on each animation frame. */
	const onAnimationFrame = () => {
	requestAnimationFrame(onAnimationFrame)
	/** @type {CSSStyleSheet[]} Observed StyleSheets after this frame. */

	function deepAssign(objectA, objectB) {
	for (var n in objectB) {
	var objectBN = objectB[n]

	if (objectBN === Object(objectBN)) {
	var objectAN = objectA[n]

	if (objectAN === Object(objectAN)) {
	objectA[n] = deepAssign(objectAN, objectBN)

	(
	(
	d,
	c = d.createElement('b').style,
	a = c.gap = 0,
	polyfillList = new WeakMap,
	ungapful = /^(normal\|0px)+$/,
	polyfillNode = element => {
	if (polyfillList.has(element)) return
	polyfillList.set(element, true)

	/** Returns a unique identifier tied to the document in the window on which it was created. */
	const createObjectUID = (): string => URL.createObjectURL(new Blob()).slice(-5)