svelte/packages/svelte/messages/compile-errors/runes.md

invalid_legacy_props

Cannot use $$props in runes mode

invalid_legacy_rest_props

Cannot use $$restProps in runes mode

invalid_legacy_reactive_statement

$: is not allowed in runes mode, use $derived or $effect instead

invalid_legacy_export

Cannot use export let in runes mode — use $props instead

invalid_rune_usage

Cannot use %rune% rune in non-runes mode

invalid_state_export

Cannot export state from a module if it is reassigned. Either export a function returning the state value or only mutate the state value's properties

invalid_derived_export

Cannot export derived state from a module. To expose the current derived value, export a function returning its value

invalid_props_id

$props() can only be used with an object destructuring pattern

invalid_props_pattern

$props() assignment must not contain nested properties or computed keys

invalid_props_location

$props() can only be used at the top level of components as a variable declaration initializer

invalid_bindable_location

$bindable() can only be used inside a $props() declaration

invalid_state_location

%rune%(...) can only be used as a variable declaration initializer or a class field

invalid_effect_location

$effect() can only be used as an expression statement

invalid_host_location

$host() can only be used inside custom element component instances

invalid_assignment

Cannot assign to %thing%

invalid_binding

Cannot bind to %thing%

invalid_rune_args

%rune% cannot be called with arguments

invalid_rune_args_length

%rune% must be called with %args%

invalid_runes_mode_import

%name% cannot be used in runes mode

duplicate_props_rune

Cannot use $props() more than once

invalid_each_assignment

Cannot reassign or bind to each block argument in runes mode. Use the array and index variables instead (e.g. array[i] = value instead of entry = value)

invalid_snippet_assignment

Cannot reassign or bind to snippet parameter

invalid_derived_call

$derived.call(...) has been replaced with $derived.by(...)

conflicting_property_name

Cannot have a property and a component export with the same name