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Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

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© 2024 – Pkg Stats / Ryan Hefner




Allows to write stories in Svelte syntax




Svelte Story Format

Allows you to write your stories in .svelte syntax rather than .js syntax.

It supports:

  • args stories and stories without args ;
  • the "template" pattern for args stories, compatible with a svelte syntax ;
  • extractions of sources of the stories and compatible with addon-sources
  • decorators
  • knobs, actions, controls
  • storyshots (with a special jest transformation shipped under @storybook/addon-svelte-csf/jest-transform)


Have a basic button component:

  export let rounded = true;

  .rounded {
    border-radius: 35px;

  button {
    border: 3px solid;
    padding: 10px 20px;
    background-color: white;
    outline: none;

<button class="button" class:rounded on:click={onClick}>
  <slot />

And a button.stories.svelte file:

<script context="module">
  import Button from './Button.svelte';

  export const meta = {
    title: "Button",
    component: Button

  import { Story, Template } from '@storybook/addon-svelte-csf';

  let count = 0;
  function handleClick() {
    count += 1;

<Template let:args>
  <!--👇 'on:click' allows to forward event to addon-actions  -->
  <Button {...args} 
    You clicked: {count}

<Story name="Rounded" args={{rounded: true}}/>

<Story name="Square" source args={{rounded: false}}/>

<!-- Dynamic snippet should be disabled for this story -->
<Story name="Button No Args">

Actions are automatically registered by Storybook. To be used by this addon, you just have to forward the event (on:click in the previous example).

Getting Started

  1. npm install --save-dev @storybook/addon-svelte-csf or yarn add --dev @storybook/addon-svelte-csf
  2. In .storybook/main.js, add @storybook/addon-svelte-csf to the addons array
  3. In .storybook/main.js, include .stories.svelte files in your stories patterns, eg. by changing the patterns to '../src/**/*.stories.@(js|jsx|ts|tsx|svelte)'

An example main.js configuration could look like this:

module.exports = {
  stories: ['../src/**/*.stories.@(js|jsx|ts|tsx|svelte)'],
  addons: [
  framework: '@storybook/svelte-vite',

Version Dependencies


Version 4 of this addon requires at least:

  • Storybook v7
  • Svelte v4
  • Vite v4 (if using Vite)
  • @sveltejs/vite-plugin-svelte v2 (if using Vite)

If you're using Svelte v3 you can use version ^3.0.0 of this addon instead.


Version 3 of this addon requires at least Storybook v7.

If you're using Storybook between v6.4.20 and v7.0.0, you should instead use version ^2.0.0 of this addon.