developit

import {
	signal,
	effect,
	useSignal,
	type useSignalEffect,
	type Signal,
	type ReadonlySignal,
} from '@preact/signals';
import { VNode, type ComponentChildren } from 'preact';
import {

developit

node_modules

developit

#!/usr/bin/env node

/* eslint-disable no-param-reassign, no-fallthrough, guard-for-in, require-atomic-updates */
const path = require('node:path');
const {Worker} = require('node:worker_threads');

const DEBUG = {parsing: false, timing: false};
const debugEnv = process.env.DEBUG;
if (debugEnv) {
  for (const name in DEBUG) {

developit

computedWithMemo()

It's computed(), but with a second argument that gets passed each newly returned value in order to produce a string cache key. If you return the same cache key as the previous run of the computed, no update will be performed (no effects, no renders, etc).

JSFiddle Demo

- computed(
-   () => ['an', 'unstable', 'return', 'value'],
- )

developit

import { signal, effect } from "@preact/signals-core";

interface CustomStorage {
  getItem(key: string): void;
  setItem(key: string, value: string | null): void;
}

/**
 * A version of signal() that persists and recalls its value in localStorage.
 *

developit

import { createContext } from 'preact';
import { useContext, useRef, useMemo, useState, useLayoutEffect } from 'preact/hooks';

function createSlotContext() {
	const slots = {};
	const owners = {};
	const subs = [];
	const sub = (name, fn) => {
		const e = [name, fn];
		subs.push(e);

developit

Welcome to the wacky world of almost 30 years of web

All of the following values for the <script type=" ••• "> will cause inline or external JavaScript to execute:

Value	Note
""	The default value of script.type (eg: no type attribute present)
"text/javascript"	The official JavaScript MIME type
"application/javascript"	Legacy MIME type from when semantics mattered
"text/x-javascript"	Legacy MIME type from before JavaScript was accepted as a valid MIME type

developit

import { useSignal, signal, effect } from '@preact/signals';
import { useLayoutEffect, useMemo, useRef } from 'preact/hooks';

/** @template T @typedef {T extends (infer U)[] ? U : never} Items */

/** @param {{ v, k?, f }} props */
const Item = ({ v, k, f }) => f(v, k);

/**
 * Like signal.value.map(fn), but doesn't re-render.

developit

/**
 * useSignal, but works as a ref on DOM elements.
 * @template T
 * @param {T} value
 */
export function useSignalRef(value) {
	const ref = /** @type {Signal<T> & { current: T }} */ (useSignal(value));
	if (!('current' in ref)) Object.defineProperty(ref, 'current', refSignalProto);
	return ref;
}

developit

import { hook, OptionsTypes } from './preact-options-helper.ts';

hook(OptionsTypes.RENDER, (old, vnode) => {
    let component = vnode.__c;
    if (component) {
        // do stuff with the component instance
    } else {
        console.log(vnode.props);
 }