Sapper VS jest

I built my first simple blog site in 2020 using Svelte and Sapper. The blog posts were powered by markdown files stored in the repository, and it was a great starting point.

Sapper

pancake which has very scarce documentation and is in thorough experimentation(at the time of writing). Since it has been created by Rich Harris, you can rest assured that it might probably never get documentation or a stable release just like our fallen soldier sapper (a moment of silence in remembrance)

You might also want to check out Sapper, a framework built on Svelte that allows you to develop more advanced features like server-side rendering, offline support, and file-based routing.

Does this help https://github.com/sveltejs/sapper/issues/343

SvelteKit can be considered the successor to Sapper or NextJS for Svelte. It is packed with tons of cool features, like server side rendering, routing, and code splitting.

So after using Sapper for some time, I decided to move my website to SvelteKit. I remember saying that I would not move to SvelteKit till they hit version 1 but the framework looks too promising. It had features which I needed and those features weren't in Sapper.

By that time, we had some troubles with virtual dom itself in our custom rich text editor that we based on slate - it was getting a bit laggy when creating huge financial documents (they usually have enormous tables and a lot of infographics) -so we were already thinking about other options and that’s where svelte comes into the light - especially sapper which was de facto default framework to be used with svelte at that time (SvelteKit wasn’t even announced).

Sapper is a framework for building web applications of all sizes, with a beautiful development experience and flexible filesystem-based routing. It is the predecessor of Sveltekit.

GitHub | Website

Jest

you have selected a testing framework. In my case, it's Jest with Supertest

Jest, created and maintained by Facebook, is a JavaScript testing framework with a focus on simplicity. It is often recognized for its zero-configuration setup and seamless integration, especially with React applications, making it a favored choice for developers in both small-scale projects and large enterprise applications.

Jest (https://jestjs.io/)

console.error Jest encountered an unexpected token Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. By default "node\_modules" folder is ignored by transformers. Here's what you can do: • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it. • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript • To have some of your "node\_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option. You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/configuration For information about custom transformations, see: https://jestjs.io/docs/code-transformation

Note: I will be using Jest as testing framework throughout the examples.

We use Jest Framework for testing. Jest is not a dogma, and, of course, in its place can be any other test runner, such as Mocha or Ava. Let's focus on tests. I'll provide a short example because I don’t want to waste your time. You can find the full version here. It's crucial to read the comments in the code below. Let's go!

Jest has long been my favorite got to test runner when it comes to UI unit and integration testing. With tools like React Testing Library (Testing Library framework for React) you get the benefit of very easy to write and maintain tests, as well as a quick and efficient way to run our tests.

Jest is a well-regarded JavaScript testing framework primarily designed for React applications, although its utility extends to projects using Babel, JavaScript, Node, Angular, and Vue. Created by Facebook, Jest emphasizes ensuring the correctness of JavaScript codebases. It allows developers to write tests with a familiar, feature-rich API, making the testing process swift and enjoyable​​.