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Introducing the All New SvelteKit and SCSS Kit for


At This Dot Labs, we love Svelte. We've even created a kit for SvelteKit that you can use to scaffold your next frontend project using SCSS, TypeScript, Vitest and Storybook.

What is helps developers get started building web apps with a variety of frameworks, showcasing how various libraries can fit together to solve similar problems. To do that, This Dot Labs has built a series of showcase apps that recreate the experience of using GitHub.

What is SvelteKit? How is it unique?

SvelteKit is a full-stack framework that gives you the best of both worlds: the page is server-side rendered on your first visit, but when you navigate to other pages, they are client-side rendered. SvelteKit gives you levers for your pages to use SSR (server-side rendering), CSR (client-side rendering), SSG (static site generation), SPA (single page application) & MPA (multi page application). The core of SvelteKit provides a highly configurable rendering engine.

Why SvelteKit and not Svelte?

SvelteKit isn’t built on top of Svelte, but it’s a backend web framework where Svelte is used as the view layer. In theory, you could rip it out and replace it with another component framework that supports server-side rendering, and the same is true for other web frameworks.

This allows us to deploy everything as a Node server, or even use Vercel and serverless functions.

Other reasons to use SvelteKit include:

  1. Pages (file based routing)
  2. Endpoints (API routes)
  3. Nested layouts (way more powerful than just nesting files because the segment of the URL maps to your component hierarchy)
  4. Hot module replacement (instant updates in the browser when you make a change preserving application state)
  5. Preprocessing (TypeScript, SCSS, and Pug among others)
  6. Building component libraries (creating and publishing npm packages)
  7. Deployment options (adapters for any platform)

Building a SvelteKit showcase presented several challenges given its uniqueness and different approach to building web apps. This blog post details what we chose to include in our SvelteKit GitHub clone, and how we integrated them.

Project Structures and Naming Conventions

SvelteKit-SCSS Project Structure

SvelteKit has unique conventions in its project structure and naming conventions.

Project Files


This is the meat of the project:

  • lib contains your library code, which can be imported via the $lib alias, or packaged up for distribution using svelte-package. It can be imported by using the $lib/* alias.
    • server contains your server-only library code. SvelteKit will prevent you from importing these in client code.
    • components contain single responsibility components that are imported in our routes. They typically contain three files: .spec.ts for unit tests, .svelte and .stories.ts for storybook stories. Barrel files were not necessary here.
    • images contains images that can be imported, and used in the project.
    • stores contains state that needs to be accessed by multiple unrelated components, or by a regular JS module.
    • styles contains styles that can be imported in our Svelte applications.
  • params contains any param matchers your app needs
  • routes contains the routes of your application
  • app.html is your page template — an HTML document containing the following placeholders:
    • %sveltekit.head% — link and script elements needed by the app, plus any head content
    • %sveltekit.body% — the markup for a rendered page. This should live inside a <div> or other element, rather than directly inside the body element, to prevent bugs caused by browser extensions injecting elements that are then destroyed by the hydration process. SvelteKit will warn you in development if this is not the case
    • %sveltekit.assets% — either paths.assets, if specified, or a relative path to paths.base
    • %sveltekit.nonce% — a CSP nonce for manually included links and scripts, if used
  • hooks.server.ts contains your application's hooks


Any static assets that should be served as-is, like robots.txt or favicon.png, go in here.


This file contains your Svelte and SvelteKit configuration.


Since SvelteKit relies on certain configuration being set a specific way, it generates its own .svelte-kit/tsconfig.json file, which your own config extends.


A SvelteKit project is really just a Vite project that uses the @sveltejs/kit/vite plugin, along with any other Vite configuration.


To get a deep dive of how routing works with SvelteKit, please check out this article.


SvelteKit supports a number of CSS preprocessors.

For people who are new to Svelte or SvelteKit, the syntax for using SCSS or SASS is simple, just need to add the lang="sass" attribute to the style tag.

    <style lang="scss">
        ul {
            list-style-type: circle;
            li {
                position: relative;
    npm i -D sass

Then add SCSS support with the svelte-preprocess package.

// svelte.config.js

import adapter from "@sveltejs/adapter-auto";
import preprocess from "svelte-preprocess";

/** @type {import('@sveltejs/kit').Config} */
const config = {
  // Consult
  // for more information about preprocessors
  preprocess: preprocess({ typescript: true, scss: true }),

  kit: {
    adapter: adapter(),

export default config;

Why SCSS and not Tailwind?

Tailwind CSS has been used by several other starter kits. We otherwise decided to go with SCSS as the syntax is simple and easily understood by even beginners.


Test Driven Development (TDD) is one of the best ways to ensure your code works like it's supposed to work. It can also help you create reliable builds during continuous deployments.

Vitest is an up-and-coming testing framework which has similar functionality to Jest.

Since we are using Vite as our build tool for Svelte in this kit, Vitest has very good integration with Vite, and offers a similar testing environment without needing extra configuration.

To test Svelte components that seemed to be hard to test. Such as two-way bindings, name slots, Context API, etc., we need to add more configuration.

We added @testing-library/svelte, jsdom and @testing-library/jest-dom that allow for similar functionality as Jest.

npm i -D @testing-library/svelte @testing-library/jest-dom jsdom

We ensured the $lib alias is supported in our tests by resolving the alias in our vite.config.ts. We also added a setupTest.ts to add @testing-library/jest-dom matchers & mocks of SvelteKit modules.

// vite.config.ts

import { sveltekit } from "@sveltejs/kit/vite";
import type { UserConfig } from "vite";
import { configDefaults, type UserConfig as VitestConfig } from "vitest/config";
import path from "path";

const config: UserConfig & { test: VitestConfig["test"] } = {
  plugins: [sveltekit()],
  define: {
    // Eliminate in-source test code
    "import.meta.vitest": "undefined",
  test: {
    // jest like globals
    globals: true,
    environment: "jsdom",
    // in-source testing
    includeSource: ["src/**/*.{js,ts,svelte}"],
    // Add @testing-library/jest-dom matchers & mocks of SvelteKit modules
    setupFiles: ["./setupTests.ts"],
    // Exclude files in c8
    coverage: {
      exclude: ["setupTest.ts"],
    deps: {
      // Put Svelte component here, e.g., inline: [/svelte-multiselect/, /msw/]
      inline: [],
    // Exclude playwright tests folder
    exclude: [...configDefaults.exclude, "tests"],

  // Ensure the $lib alias is supported in our tests
  resolve: {
    alias: {
      $lib: path.resolve(__dirname, "./src/lib"),

export default config;
// setupTest.ts

/* eslint-disable @typescript-eslint/no-empty-function */
import matchers from "@testing-library/jest-dom/matchers";
import { expect, vi } from "vitest";
import type { Navigation, Page } from "@sveltejs/kit";
import { readable } from "svelte/store";
import * as environment from "$app/environment";
import * as navigation from "$app/navigation";
import * as stores from "$app/stores";

// Add custom jest matchers

// Mock SvelteKit runtime module $app/environment
vi.mock("$app/environment", (): typeof environment => ({
  browser: false,
  dev: true,
  building: false,
  version: "any",

// Mock SvelteKit runtime module $app/navigation
vi.mock("$app/navigation", (): typeof navigation => ({
  afterNavigate: () => {},
  beforeNavigate: () => {},
  disableScrollHandling: () => {},
  goto: () => Promise.resolve(),
  invalidate: () => Promise.resolve(),
  invalidateAll: () => Promise.resolve(),
  preloadData: () => Promise.resolve(),
  preloadCode: () => Promise.resolve(),

// Mock SvelteKit runtime module $app/stores
vi.mock("$app/stores", (): typeof stores => {
  const getStores: typeof stores.getStores = () => {
    const navigating = readable<Navigation | null>(null);
    const page = readable<Page>({
      url: new URL("http://localhost"),
      params: {},
      route: {
        id: null,
      status: 200,
      error: null,
      data: {},
      form: undefined,
    const updated = {
      subscribe: readable(false).subscribe,
      check: () => false,

    return { navigating, page, updated };

  const page: typeof = {
    subscribe(fn) {
      return getStores().page.subscribe(fn);
  const navigating: typeof stores.navigating = {
    subscribe(fn) {
      return getStores().navigating.subscribe(fn);
  const updated: typeof stores.updated = {
    subscribe(fn) {
      return getStores().updated.subscribe(fn);
    check: () => false,

  return {

If you want to see some test recipes you can use on your SvelteKit projects, check out our SvelteKit-SCSS Github showcase.


Like many of the other kits, the SvelteKit starter uses Storybook to interactively view and build components in isolation.

For more information on Storybook and SvelteKit visit the article.


ESLint and Prettier are useful tools for keeping the project neat and consistent among multiple contributors.

To quickly format your project, run:

    npm run format

Running ESLint and Prettier as part of your git workflow is important because it helps you fail fast. This helps us, as contributors, to have a more consistent production codebase.

We achieved this in our SvelteKit-SCSS Github showcase with the help of Husky, lint-staged and Prettier.

How does lint-staged work? It's specifically designed to work on "staged" files, which are files you've changed or created, but haven't yet committed to your project. Working on staged files limits the number of files you need to lint at any given time, and makes the workflow faster.

We configured lint-staged in our package.json. This runs Prettier pre-commit, and ensures the code is up to our ESLint standards.

    // package.json
    "lint-staged": {
        "src/**/*{.js,.ts,.html,.css,.svelte}": [
            "prettier --plugin-search-dir . --write ."
        "src/**/*{.js,.ts,.svelte}": "eslint ."

The commands you configure will run "pre-commit". As you're attempting to commit files to your project you'll see ESLint run in your terminal. Once it's done you may have successfully committed, or find yourself with linting errors you need to fix before you're able to commit the code.

This works hand-in-hand with husky. Husky uses distinct bash files with filenames that match the workflow step they correspond to, e.g. "pre-commit".

    . "$(dirname "$0")/_/"

    cd svelte-kit-scss
    npx lint-staged

Running ESLint, or Prettier as part of your git workflow is important because it helps you fail fast, which helps contributors have a more consistent production codebase.


SvelteKit is a relatively new and novel framework. The structure represents our best judgment of how a basic SvelteKit application should be. We welcome everyone to take a look, and contribute back to the SvelteKit-SCSS and our SvelteKit-SCSS Github showcase if you have any improvements that you would like to propose!

This Dot Labs is a development consultancy that is trusted by top industry companies, including Stripe, Xero, Wikimedia, Docusign, and Twilio. This Dot takes a hands-on approach by providing tailored development strategies to help you approach your most pressing challenges with clarity and confidence. Whether it's bridging the gap between business and technology or modernizing legacy systems, you’ll find a breadth of experience and knowledge you need. Check out how This Dot Labs can empower your tech journey.

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In-App DevTools The first thing that caught my attention is that breaking away from traditional browser extensions, Nuxt DevTools v1.0 is seamlessly integrated within your Nuxt app. This ensures universal compatibility across browsers and devices, offering a more stable and consistent development experience. This setup also means the tools are readily available in the app, making your work more efficient. It's a smart move from the usual browser extensions, making it a notable highlight. To use it you just need to press Shift + Option + D` (macOS) or `Shift + Alt + D` (Windows): With simple keystrokes, the Nuxt DevTools v1.0 springs to life directly within your app, ready for action. This integration eliminates the need to toggle between windows or panels, keeping your workflow streamlined and focused. The tools are not only easily accessible but also intelligently designed to enhance your productivity. Pages, Components, and Componsables View The Pages, Components, and Composables View in Nuxt DevTools v1.0 are a clear roadmap for your app. They help you understand how your app is built by simply showing its structure. It's like having a map that makes sense of your app's layout, making the complex parts of your code easier to understand. This is really helpful for new developers learning about the app and experienced developers working on big projects. Pages View lists all your app's pages, making it easier to move around and see how your site is structured. What's impressive is the live update capability. As you explore the DevTools, you can see the changes happening in real-time, giving you instant feedback on your app's behavior. Components View is like a detailed map of all the parts (components) your app uses, showing you how they connect and depend on each other. This helps you keep everything organized, especially in big projects. You can inspect components, change layouts, see their references, and filter them. By showcasing all the auto-imported composables, Nuxt DevTools provides a clear overview of the composables in use, including their source files. This feature brings much-needed clarity to managing composables within large projects. You can also see short descriptions and documentation links in some of them. Together, these features give you a clear picture of your app's layout and workings, simplifying navigation and management. Modules and Static Assets Management This aspect of the DevTools revolutionizes module management. It displays all registered modules, documentation, and repository links, making it easy to discover and install new modules from the community! This makes managing and expanding your app's capabilities more straightforward than ever. On the other hand, handling static assets like images and videos becomes a breeze. The tool allows you to preview and integrate these assets effortlessly within the DevTools environment. These features significantly enhance the ease and efficiency of managing your app's dynamic and static elements. The Runtime Config and Payload Editor The Runtime Config and Payload Editor in Nuxt DevTools make working with your app's settings and data straightforward. The Runtime Config lets you play with different configuration settings in real time, like adjusting settings on the fly and seeing the effects immediately. This is great for fine-tuning your app without guesswork. The Payload Editor is all about managing the data your app handles, especially data passed from server to client. It's like having a direct view and control over the data your app uses and displays. This tool is handy for seeing how changes in data impact your app, making it easier to understand and debug data-related issues. Open Graph Preview The Open Graph Preview in Nuxt DevTools is a feature I find incredibly handy and a real time-saver. It lets you see how your app will appear when shared on social media platforms. This tool is crucial for SEO and social media presence, as it previews the Open Graph tags (like images and descriptions) used when your app is shared. No more deploying first to check if everything looks right – you can now tweak and get instant feedback within the DevTools. This feature not only streamlines the process of optimizing for social media but also ensures your app makes the best possible first impression online. Timeline The Timeline feature in Nuxt DevTools is another standout tool. It lets you track when and how each part of your app (like composables) is called. This is different from typical performance tools because it focuses on the high-level aspects of your app, like navigation events and composable calls, giving you a more practical view of your app's operation. It's particularly useful for understanding the sequence and impact of events and actions in your app, making it easier to spot issues and optimize performance. This timeline view brings a new level of clarity to monitoring your app's behavior in real-time. Production Build Analyzer The Production Build Analyzer feature in Nuxt DevTools v1.0 is like a health check for your app. It looks at your app's final build and shows you how to make it better and faster. Think of it as a doctor for your app, pointing out areas that need improvement and helping you optimize performance. API Playground The API Playground in Nuxt DevTools v1.0 is like a sandbox where you can play and experiment with your app's APIs. It's a space where you can easily test and try out different things without affecting your main app. This makes it a great tool for trying out new ideas or checking how changes might work. Some other cool features Another amazing aspect of Nuxt DevTools is the embedded full-featured VS Code. It's like having your favorite code editor inside the DevTools, with all its powerful features and extensions. It's incredibly convenient for making quick edits or tweaks to your code. Then there's the Component Inspector. Think of it as your code's detective tool. It lets you easily pinpoint and understand which parts of your code are behind specific elements on your page. This makes identifying and editing components a breeze. And remember customization! Nuxt DevTools lets you tweak its UI to suit your style. This means you can set up the tools just how you like them, making your development environment more comfortable and tailored to your preferences. Conclusion In summary, Nuxt DevTools v1.0 marks a revolutionary step in web development, offering a comprehensive suite of features that elevate the entire development process. Features like live updates, easy navigation, and a user-friendly interface enrich the development experience. Each tool within Nuxt DevTools v1.0 is thoughtfully designed to simplify and enhance how developers build and manage their applications. In essence, Nuxt DevTools v1.0 is more than just a toolkit; it's a transformative companion for developers seeking to build high-quality web applications more efficiently and effectively. It represents the future of web development tools, setting new standards in developer experience and productivity....