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

bindable_invalid_location

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

constant_assignment

Cannot assign to %thing%

constant_binding

Cannot bind to %thing%

declaration_duplicate

%name% has already been declared

declaration_duplicate_module_import

Cannot declare same variable name which is imported inside <script context="module">

derived_invalid_export

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

dollar_binding_invalid

The $ name is reserved, and cannot be used for variables and imports

dollar_prefix_invalid

The $ prefix is reserved, and cannot be used for variables and imports

each_item_invalid_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)

effect_invalid_placement

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

global_reference_invalid

%name% is an illegal variable name. To reference a global variable called %name%, use globalThis.%name%

host_invalid_placement

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

legacy_export_invalid

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

legacy_props_invalid

Cannot use $$props in runes mode

legacy_reactive_statement_invalid

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

legacy_rest_props_invalid

Cannot use $$restProps in runes mode

module_illegal_default_export

A component cannot have a default export

props_duplicate

Cannot use $props() more than once

props_invalid_identifier

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

props_invalid_pattern

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

props_invalid_placement

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

reactive_declaration_cycle

Cyclical dependency detected: %cycle%

rune_invalid_arguments

%rune% cannot be called with arguments

rune_invalid_arguments_length

%rune% must be called with %args%

rune_invalid_computed_property

Cannot access a computed property of a rune

rune_invalid_name

%name% is not a valid rune

rune_invalid_usage

Cannot use %rune% rune in non-runes mode

rune_missing_parentheses

Cannot use rune without parentheses

runes_mode_invalid_import

%name% cannot be used in runes mode

snippet_parameter_assignment

Cannot reassign or bind to snippet parameter

state_invalid_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

state_invalid_placement

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

store_invalid_scoped_subscription

Cannot subscribe to stores that are not declared at the top level of the component

store_invalid_subscription

Cannot reference store value inside <script context="module">