Lcf.vs Lcfvs

🎯

Focusing

Lcfvs / resolved.js

Last active April 1, 2022 20:08

Lcfvs / events.js

Last active January 23, 2022 18:05

Event listening avoiding memory leaks & associating a weak context

	const { assign, create, freeze } = Object

	const contexts = new Map()

	export const capture = true
	export const once = true
	export const passive = true

	export const context = (listener, event) => {
	const { currentTarget, target, type } = event

Lcfvs / EventHandler.js

Last active September 28, 2021 11:41

An iterable event handler

	const registry = new FinalizationRegistry(handler => handler.disconnect())

	class EventHandler {
	#consumed = false
	#options = null
	#prevent = false
	#promises = []
	#resolve = null
	#ref = null
	#type = null

Lcfvs / MutationObserver.js

Last active September 28, 2021 13:22

A MutationObserver providing an iterator

	export class MutationObserver extends globalThis.MutationObserver {
	#consumed = false
	#promises = []
	#resolve = null

	#enqueue = record => {
	if (this.#resolve) {
	this.#resolve(record)
	this.#next()
	}

Lcfvs / dependencies.js

Created July 19, 2021 11:26

Late dependencies

	export default new Proxy(new Map(), {
	get: (target, name) => {
	if (!target.has(name)) {
	target.set(name, [[]])
	}

	const entry = target.get(name)
	const [resolvers, value] = entry

	return entry.length === 2

Lcfvs / example.js

Created June 17, 2021 00:59

typed fetcher

	import * as fetcher from './text-fetcher.js'

	const fetchText = event => fetcher.resolver.resolve(event)

	document.querySelector('form')
	.addEventListener('submit', fetchText)

	document.querySelector('a')
	.addEventListener('click', fetchText)

Lcfvs / example.js

Last active June 16, 2021 17:31

a simple fetcher, based on actions

	import { resolve, text } from './fetcher.js'

	const fetchText = event => resolve(event, [
	fetch,
	text,
	data => console.log({ data })
	])

	document.querySelector('form')
	.addEventListener('submit', fetchText)

Lcfvs / fileToURI.js

Created June 11, 2021 22:40

fileToURI.js

	const fileToURI = async file => new Promise((onload, onerror) =>
	Object.assign(new FileReader(), { onload, onerror })
	.readAsDataURL(file))

Lcfvs / controller.js

Last active May 25, 2021 11:02

abort controller with progress

Lcfvs / controller.js

Last active July 8, 2021 09:50

abort controller generator

	function* controller (end) {
	while (end !== (yield)) {}
	}

	const end = Symbol()
	const it = controller(end)

	console.log(it.next()) // { value: undefined, done: false }
	console.log(it.next(end)) // { value: undefined, done: true } -> aborted