svelte

Svelte binding on non-writable value

bind:.*Cannot bind to.*not writable|binding.*readonly

Fixes

1.Only bind to writable variables (let declarations or writable stores)
2.Use on:input event handler instead of bind:value for derived values
3.Create a local writable copy if the source is a prop or derived store

sveltebindingreactivity

Related Errors

Component not valid for SSR rendering

is not a valid SSR component

•Add export default to the component or check the import path
•Ensure the component doesn't use browser APIs at top level

Svelte $ reactive syntax error

\$.*is not defined|\$state.*not allowed

•Ensure $ reactive declarations are at the top level of a .svelte file
•In Svelte 5, use $state() rune inside .svelte.ts files only with proper config

Lifecycle function called outside component initialization

lifecycle.*can only be.*during.*initialisation|onMount.*outside component

•Call onMount/onDestroy at the top level of the component script, not in callbacks
•Move lifecycle calls out of async functions or setTimeout