Svelte playground

I've been using React for quite a few projects and I think time has come to learn and deep dive into Svelte... so I'm using this project to do that.

• References
• Steps
  • Tailwindcss
  • DaisyUI
• Caveats
  • DOM: end of block
  • Runes
• Svelte + TS + Vite (original doc)
  • Recommended IDE Setup
  • Need an official Svelte framework?
  • Technical considerations

References

• https://svelte.dev/
  • https://svelte.dev/docs/svelte
  • https://svelte.dev/tutorial
  • https://svelte.dev/playground
• https://github.com/sveltejs/svelte
• https://vite.dev/

Steps

• pnpm create vite@latest -t svelte-ts svelte-playground (pnpm 10.13.1)
• pnpm install
• pnpm run dev

Tailwindcss

Refs:

• https://tailwindcss.com/docs/installation/using-vite → OK: use this
• https://tailwindcss.com/docs/installation/framework-guides
  • https://tailwindcss.com/docs/installation/framework-guides/sveltekit → KO: it's SvelteKit, not Svelte

Steps:

• pnpm install tailwindcss @tailwindcss/vite
• vite.config.ts: add tailwindcss vite plugin configuration → ba10ff0
  • import tailwindcss from '@tailwindcss/vite'
  • plugins: [tailwindcss(), ... ]
• src/app.css: @import "tailwindcss";
• index.html: <link rel="stylesheet" href="/src/app.css" />

DaisyUI

Refs

• https://daisyui.com/docs/install/
  • https://daisyui.com/docs/install/vite/ → OK: use this
  • https://daisyui.com/docs/install/sveltekit/ → KO: it's SvelteKit, not Svelte

Provided that Tailwindcss is already installed:

• pnpm install daisyui@latest
• src/app.css: add @plugin "daisyui";

Caveats

DOM: end of block

https://svelte.dev/tutorial/svelte/keyed-each-blocks:

• By default, updating the value of an each block will add or remove DOM nodes at the end of the block if the size changes, and update the remaining DOM.
• Svelte works differently (vs React): the component "runs" once and subsequent updates are fine-grained. This makes things faster and gives you more control.
• Options
  • {#each things as thing (thing.id)}<Thing name={thing.name}/>{/each}
  • Use $derived() rune on the props withing the nested component

Runes

https://svelte.dev/docs/svelte/what-are-runes: Runes are symbols that you use in .svelte and .svelte.js / .svelte.ts files to control the Svelte compiler. If you think of Svelte as a language, runes are part of the syntax — they are keywords.

Some Svelte runes:

• $state: declares reactive state → let count = $state(0);
• $derived: computed value → let double = $derived(count * 2);
• $effect: runs when dependencies change → $effect(() => { console.log(count); });
• $props: component props → let { name, age } = $props();

Svelte + TS + Vite (original doc)

This template should help get you started developing with Svelte and TypeScript in Vite.

Recommended IDE Setup

VS Code + Svelte.

Need an official Svelte framework?

Check out SvelteKit, which is also powered by Vite. Deploy anywhere with its serverless-first approach and adapt to various platforms, with out of the box support for TypeScript, SCSS, and Less, and easily-added support for mdsvex, GraphQL, PostCSS, Tailwind CSS, and more.

Technical considerations

Why use this over SvelteKit?

• It brings its own routing solution which might not be preferable for some users.
• It is first and foremost a framework that just happens to use Vite under the hood, not a Vite app.

This template contains as little as possible to get started with Vite + TypeScript + Svelte, while taking into account the developer experience with regards to HMR and intellisense. It demonstrates capabilities on par with the other create-vite templates and is a good starting point for beginners dipping their toes into a Vite + Svelte project.

Should you later need the extended capabilities and extensibility provided by SvelteKit, the template has been structured similarly to SvelteKit so that it is easy to migrate.

Why global.d.ts instead of compilerOptions.types inside jsconfig.json or tsconfig.json?

Setting compilerOptions.types shuts out all other types not explicitly listed in the configuration. Using triple-slash references keeps the default TypeScript setting of accepting type information from the entire workspace, while also adding svelte and vite/client type information.

Why include .vscode/extensions.json?

Other templates indirectly recommend extensions via the README, but this file allows VS Code to prompt the user to install the recommended extension upon opening the project.

Why enable allowJs in the TS template?

While allowJs: false would indeed prevent the use of .js files in the project, it does not prevent the use of JavaScript syntax in .svelte files. In addition, it would force checkJs: false, bringing the worst of both worlds: not being able to guarantee the entire codebase is TypeScript, and also having worse typechecking for the existing JavaScript. In addition, there are valid use cases in which a mixed codebase may be relevant.

Why is HMR not preserving my local component state?

HMR state preservation comes with a number of gotchas! It has been disabled by default in both svelte-hmr and @sveltejs/vite-plugin-svelte due to its often surprising behavior. You can read the details here.

If you have state that's important to retain within a component, consider creating an external store which would not be replaced by HMR.

// store.ts
// An extremely simple external store
import { writable } from 'svelte/store'
export default writable(0)