Q1. How does the Svelte compiler implement reactivity?
Svelte is a compiler, not a runtime framework. At build time it parses components and turns reactive statements into precise DOM update instructions. In Svelte 3 and 4, l...
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Q2. What are Svelte 5 runes and how do they differ from $: statements?
Runes are compiler keywords that make reactivity explicit and also work in .svelte.js and .svelte.ts modules, not just components. $state creates a reactive value, deeply...
Q3. How do Svelte stores work?
A Svelte store is any object with a subscribe method that calls a callback with the current value and returns an unsubscribe function. The built-in writable, readable and...
Q4. How does SvelteKit routing and data loading work?
SvelteKit uses filesystem routing under src/routes. A +page.svelte renders a page, +page.js or +page.server.js exports a load function that runs before the page and retur...
Q5. Why does mutating arrays or objects sometimes not update a Svelte 3/4 component?
In Svelte 3 and 4 reactivity is triggered by assignment to the variable the compiler tracks. Mutating an array or object in place does not notify the compiler because no ...
Q6. How do slots and component composition work in Svelte?
Slots let a parent pass markup into a child. A default slot is placed with slot in the child and any children of the parent's component tag fill it. Named slots use slot ...
Q7. What lifecycle functions does Svelte provide and when do you use tick?
Svelte components have a small lifecycle API. onMount runs once after the component is first rendered in the browser. It does not run during SSR, so it is the place for D...
Q8. How do SSR, prerendering and performance options work in SvelteKit?
SvelteKit renders every page on the server by default and then hydrates it on the client, so the first paint is real HTML. You control this per route with page options. e...