In this episode of Syntax, Scott teaches Wes about Svelte and Sapper — general premise, best practices, and more!
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Show Notes
03:14 - General premise
- Sapper compiles away, removing framework code from build
- Component & Props based
- Easy reactivity
- Built-in tools like animation
- Template-based
07:57 - Svelte 101
- .svelte files
- Files can include , , and straight-up CSS
- Variables are used in templates via {var} - even works
- Import component and use just like React and Vue
10:49 - Stylin’
- All styles are scoped by default
- global() to wrap around global declarations
- Language type sass to use sass
12:22 - Reactivity
- Baked in
- let count = 0
- count = count + 1 will reactively update in template
- variables are essentially state
- $: double = count + 2 - to create a reactive variable that updates when another variable updates
- $: console.log(count) = will run whenever count is update a-la useEffect
- $: if (count >10) = same… reactive if
- updates let name in script
15:55 - Props
- Same was React, but need to be exported before they can be used
- Seems counterintuitive, but you get over it quickly
- EZ defaults export let answer = 'a mystery';
import Nested from './Nested.svelte'; export let answer = 'a mystery';
The answer is {answer}
20:08 - Template logic
{#await promise}
...waiting
{:then number}
The number is {number}
{:catch error}
{error.message}
{/await}
23:12 - Events
-
- On directive
- Functions can also be inline
- Modifiers
Click me
26:11 - Baked-in goodies
{text}
- Lifecycle methods
- Advanced State Via Stores
- A store is simply an object with a subscribe method that allows interested parties to be notified whenever the store value changes.
- import { writable } from ‘svelte/store’;
- export const count = writable(0);
- count.update(0)
- Slots
- React helmet like stuff, ie
36:39 - Sapper
- Similar to Next.js
- Folder routes
- Static export with all of the good stuff like service workers and preloading
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