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In this episode of Syntax, Scott talks with Wes about moving Level Up Tutorials from React to SvelteKit — why he did it, how, benefits, things to watch out for, and more!
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Show Notes
07:28 - Thoughts
- Apples to oranges, so unfortunately, no super legit ability to compare.
- SvelteKit isn’t analogous with a custom React setup that uses CSR
- SSR is usually going to be faster - we can ship less JS
- Some big things changed beyond React → SvelteKit
- HLS starts grabbing chunks immediately, so it’s hard to get accurate load time and transfer.
- Whole conversion took a couple of months.
- Hardest part was making UI choices and changes, straight up converting components one by one wasn’t actually that tough
16:14 - Converting React components to Svelte
- useState becomes just a straight-up variable
- Graphql calls were hooks now just imported generated functions
- Remove extranous fragments
- Convert {things && } to {#if thing}{/if}
- becomes
24:06 - Spark joys
- State
- Our checkout flow became way more transparent, way easier with Svelte stores
- Render flow
- Was never something we needed to really think about. Didn’t think about memoizing, or worrying about too many renders down the line, just never needed to
- Overall developer experience
- It’s honestly a joy to work in and I don’t want to go back
- Making a library
- Creating a sitemap was extremely easy, because of server-side routes. file.returnformat.ts ie sitemap.xml.ts
- CSS without a css-in-js library for scoping is a dream. CSS props are now 100% via CSS variables using the https://svelte.dev/docs#style_props
- Animations are all done with Svelte’s internal animations lib
32:45 - Hosting
- adapter-node
- Hosted on render.com as a straight-up node process $7/m for more than enough RAM and CPU,
- Lots of other options for static, Vercel, workers whatever, I like having just a straight-up node app you can host anywhere
35:50 - Things to do
37:00 - Challenges
- ESM is not always smooth sailin
- Import has from ‘lodash/has’ didn’t working in dev, but import has from ‘lodash/has.js’ didn’t work in prod.
- Solution was to use lodash.has as the dependency
- Apollo included all React as a dep unless you import from @core
- TS is great, but there was once where I wanted to define the entire props ts object for a spread prop, but was not possible
- Drag animations
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42:46 - Wes’ questions
- What about the ecosystem?
- What about forms + DOM data?
- Serverless functions?
- Do you always bind to state? Or just access directly?
formData = writable({ title: "yo" }) {$formData.title}
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