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193x 2389x 22x 22x 193x 2389x 4x 4x 193x 2347x 5x 1x 1x 5x 192x 2344x 4x 4x 2453x 2x 2x 2x 2x 2x 7529x 7529x 7529x 8019x 8019x 7265x 8019x 1x 1x 8019x 7528x 2x 2x 2x 2x 2x 2x 1x 1x 1x 2x 2x 2x 2x 17x 15x 15x 15x 15x 15x 15x 15x 15x 12x 2x 2x 26x 1x 1x 25x 2x 2x 23x 23x 23x 23x 21x 21x 21x 23x 1x 23x 1x 20x 1x 19x 2x 2x 3x 2x 2x 4x 2x 2x 86x 86x 86x 86x 228x 228x 228x 36x 228x 26x 26x 4x 4x 26x 228x 86x 86x 86x 86x 86x 2x 2x 83x 83x 83x 83x 83x 83x 1x 1x 2x 2x 117x 2x 2x 117x 2x 2x 2x 2x 2x 2x 2x 2x 5320x 5320x 86x 190x 190x 190x 190x 5320x 92x 156x 156x 156x 156x 5234x 3789x 3789x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 6x 18x 12x 12x 18x 3789x 5320x 2x 2x 2x 2x 2x 2x 4043x 4043x 4043x 4043x 2814x 2814x 2814x 597x 2x 2x 595x 597x 1x 1x 597x 2811x 2814x 1x 1x 2814x 4027x 4027x 4027x 4027x 4027x 4027x 4034x 1159x 1159x 1159x 4027x 4043x 36x 2x 2x 36x 4043x 2x 2x 2x 317x 1x 1x 2x 2x 12027x 12027x 12027x 12027x 12027x 12027x 12027x 1380x 12027x 1340x 1340x 1340x 1340x 1340x 90x 90x 90x 90x 90x 90x 90x 90x 1340x 1340x 2x 2x 1340x 2x 2x 2x 2x 39x 15x 9x 9x 9x 9x 9x 9x 9x 9x 8x 39x 24x 7x 1x 1x 1x 2x 2x 11x 2x 2x 2430x 2430x 1x 2430x 1x 1x 1x 1x 1x 2428x 2428x 2x 2x 143x 143x 143x 137x 143x 1x 1x 142x 2x 2x 1468x 1468x 1468x 1468x 1468x 1468x 1058x 1058x 1058x 1058x 1468x 1x 1468x 1x 1057x 198x 1x 1x 197x 197x 197x 198x 1x 1x 196x 198x 196x 198x 1x 1x 195x 198x 295x 271x 271x 271x 271x 271x 271x 271x 295x 195x 1053x 1468x 96x 96x 96x 22x 96x 96x 2x 2x 17x 17x 17x 2x 2x 304x 304x 304x 286x 286x 2x 2x 2x 2x 2x 2x | import is_reference from 'is-reference';
import {
disallowed_paragraph_contents,
interactive_elements,
is_tag_valid_with_parent
} from '../../../constants.js';
import * as e from '../../errors.js';
import {
extract_identifiers,
get_parent,
is_expression_attribute,
is_text_attribute,
object,
unwrap_optional
} from '../../utils/ast.js';
import * as w from '../../warnings.js';
import fuzzymatch from '../1-parse/utils/fuzzymatch.js';
import { binding_properties } from '../bindings.js';
import {
ContentEditableBindings,
EventModifiers,
Runes,
SVGElements,
VoidElements
} from '../constants.js';
import { is_custom_element_node } from '../nodes.js';
import {
regex_illegal_attribute_character,
regex_not_whitespace,
regex_only_whitespaces
} from '../patterns.js';
import { Scope, get_rune } from '../scope.js';
import { merge } from '../visitors.js';
import { a11y_validators } from './a11y.js';
/** @param {import('#compiler').Attribute} attribute */
function validate_attribute(attribute) {
if (attribute.value === true || attribute.value.length === 1) return;
const is_quoted = attribute.value.at(-1)?.end !== attribute.end;
if (!is_quoted) {
e.attribute_unquoted_sequence(attribute);
}
}
/**
* @param {import('#compiler').Component | import('#compiler').SvelteComponent | import('#compiler').SvelteSelf} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types.js').AnalysisState>} context
*/
function validate_component(node, context) {
for (const attribute of node.attributes) {
if (
attribute.type !== 'Attribute' &&
attribute.type !== 'SpreadAttribute' &&
attribute.type !== 'LetDirective' &&
attribute.type !== 'OnDirective' &&
attribute.type !== 'BindDirective'
) {
e.component_invalid_directive(attribute);
}
if (
attribute.type === 'OnDirective' &&
(attribute.modifiers.length > 1 || attribute.modifiers.some((m) => m !== 'once'))
) {
e.event_handler_invalid_component_modifier(attribute);
}
if (attribute.type === 'Attribute') {
if (context.state.analysis.runes) {
validate_attribute(attribute);
if (is_expression_attribute(attribute)) {
const expression = attribute.value[0].expression;
if (expression.type === 'SequenceExpression') {
let i = /** @type {number} */ (expression.start);
while (--i > 0) {
const char = context.state.analysis.source[i];
if (char === '(') break; // parenthesized sequence expressions are ok
if (char === '{') e.attribute_invalid_sequence_expression(expression);
}
}
}
}
validate_attribute_name(attribute);
if (attribute.name === 'slot') {
validate_slot_attribute(context, attribute, true);
}
}
}
context.next({
...context.state,
parent_element: null,
component_slots: new Set()
});
}
const react_attributes = new Map([
['className', 'class'],
['htmlFor', 'for']
]);
/**
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types.js').AnalysisState>} context
*/
function validate_element(node, context) {
let has_animate_directive = false;
/** @type {import('#compiler').TransitionDirective | null} */
let in_transition = null;
/** @type {import('#compiler').TransitionDirective | null} */
let out_transition = null;
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
const is_expression = is_expression_attribute(attribute);
if (context.state.analysis.runes) {
validate_attribute(attribute);
if (is_expression) {
const expression = attribute.value[0].expression;
if (expression.type === 'SequenceExpression') {
let i = /** @type {number} */ (expression.start);
while (--i > 0) {
const char = context.state.analysis.source[i];
if (char === '(') break; // parenthesized sequence expressions are ok
if (char === '{') e.attribute_invalid_sequence_expression(expression);
}
}
}
}
if (regex_illegal_attribute_character.test(attribute.name)) {
e.attribute_invalid_name(attribute, attribute.name);
}
if (attribute.name.startsWith('on') && attribute.name.length > 2) {
if (!is_expression) {
e.attribute_invalid_event_handler(attribute);
}
const value = attribute.value[0].expression;
if (
value.type === 'Identifier' &&
value.name === attribute.name &&
!context.state.scope.get(value.name)
) {
w.attribute_global_event_reference(attribute, attribute.name);
}
}
if (attribute.name === 'slot') {
/** @type {import('#compiler').RegularElement | import('#compiler').SvelteElement | import('#compiler').Component | import('#compiler').SvelteComponent | import('#compiler').SvelteSelf | undefined} */
validate_slot_attribute(context, attribute);
}
if (attribute.name === 'is' && context.state.options.namespace !== 'foreign') {
w.attribute_avoid_is(attribute);
}
const correct_name = react_attributes.get(attribute.name);
if (correct_name) {
w.attribute_invalid_property_name(attribute, attribute.name, correct_name);
}
validate_attribute_name(attribute);
} else if (attribute.type === 'AnimateDirective') {
const parent = context.path.at(-2);
if (parent?.type !== 'EachBlock') {
e.animation_invalid_placement(attribute);
} else if (!parent.key) {
e.animation_missing_key(attribute);
} else if (
parent.body.nodes.filter(
(n) =>
n.type !== 'Comment' &&
n.type !== 'ConstTag' &&
(n.type !== 'Text' || n.data.trim() !== '')
).length > 1
) {
e.animation_invalid_placement(attribute);
}
if (has_animate_directive) {
e.animation_duplicate(attribute);
} else {
has_animate_directive = true;
}
} else if (attribute.type === 'TransitionDirective') {
const existing = /** @type {import('#compiler').TransitionDirective | null} */ (
(attribute.intro && in_transition) || (attribute.outro && out_transition)
);
if (existing) {
const a = existing.intro ? (existing.outro ? 'transition' : 'in') : 'out';
const b = attribute.intro ? (attribute.outro ? 'transition' : 'in') : 'out';
if (a === b) {
e.transition_duplicate(attribute, a);
} else {
e.transition_conflict(attribute, a, b);
}
}
if (attribute.intro) in_transition = attribute;
if (attribute.outro) out_transition = attribute;
} else if (attribute.type === 'OnDirective') {
let has_passive_modifier = false;
let conflicting_passive_modifier = '';
for (const modifier of attribute.modifiers) {
if (!EventModifiers.includes(modifier)) {
const list = `${EventModifiers.slice(0, -1).join(', ')} or ${EventModifiers.at(-1)}`;
e.event_handler_invalid_modifier(attribute, list);
}
if (modifier === 'passive') {
has_passive_modifier = true;
} else if (modifier === 'nonpassive' || modifier === 'preventDefault') {
conflicting_passive_modifier = modifier;
}
if (has_passive_modifier && conflicting_passive_modifier) {
e.event_handler_invalid_modifier_combination(
attribute,
'passive',
conflicting_passive_modifier
);
}
}
}
}
}
/**
* @param {import('#compiler').Attribute} attribute
*/
function validate_attribute_name(attribute) {
if (
attribute.name.includes(':') &&
!attribute.name.startsWith('xmlns:') &&
!attribute.name.startsWith('xlink:') &&
!attribute.name.startsWith('xml:')
) {
w.attribute_illegal_colon(attribute);
}
}
/**
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types.js').AnalysisState>} context
* @param {import('#compiler').Attribute} attribute
* @param {boolean} is_component
*/
function validate_slot_attribute(context, attribute, is_component = false) {
let owner = undefined;
let i = context.path.length;
while (i--) {
const ancestor = context.path[i];
if (
!owner &&
(ancestor.type === 'Component' ||
ancestor.type === 'SvelteComponent' ||
ancestor.type === 'SvelteSelf' ||
ancestor.type === 'SvelteElement' ||
(ancestor.type === 'RegularElement' && is_custom_element_node(ancestor)))
) {
owner = ancestor;
}
}
if (owner) {
if (!is_text_attribute(attribute)) {
e.slot_attribute_invalid(attribute);
}
if (
owner.type === 'Component' ||
owner.type === 'SvelteComponent' ||
owner.type === 'SvelteSelf'
) {
if (owner !== context.path.at(-2)) {
e.slot_attribute_invalid_placement(attribute);
}
const name = attribute.value[0].data;
if (context.state.component_slots.has(name)) {
e.slot_attribute_duplicate(attribute, name, owner.name);
}
context.state.component_slots.add(name);
if (name === 'default') {
for (const node of owner.fragment.nodes) {
if (node.type === 'Text' && regex_only_whitespaces.test(node.data)) {
continue;
}
if (node.type === 'RegularElement' || node.type === 'SvelteFragment') {
if (node.attributes.some((a) => a.type === 'Attribute' && a.name === 'slot')) {
continue;
}
}
e.slot_default_duplicate(node);
}
}
}
} else if (!is_component) {
e.slot_attribute_invalid_placement(attribute);
}
}
/**
* @param {import('#compiler').Fragment | null | undefined} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types.js').AnalysisState>} context
*/
function validate_block_not_empty(node, context) {
if (!node) return;
// Assumption: If the block has zero elements, someone's in the middle of typing it out,
// so don't warn in that case because it would be distracting.
if (node.nodes.length === 1 && node.nodes[0].type === 'Text' && !node.nodes[0].raw.trim()) {
w.block_empty(node.nodes[0]);
}
}
/**
* @type {import('zimmerframe').Visitors<import('#compiler').SvelteNode, import('./types.js').AnalysisState>}
*/
const validation = {
AssignmentExpression(node, context) {
validate_assignment(node, node.left, context.state);
},
BindDirective(node, context) {
validate_no_const_assignment(node, node.expression, context.state.scope, true);
const assignee = node.expression;
const left = object(assignee);
if (left === null) {
e.bind_invalid_expression(node);
}
const binding = context.state.scope.get(left.name);
if (
assignee.type === 'Identifier' &&
node.name !== 'this' // bind:this also works for regular variables
) {
// reassignment
if (
!binding ||
(binding.kind !== 'state' &&
binding.kind !== 'frozen_state' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'store_sub' &&
!binding.mutated)
) {
e.bind_invalid_value(node.expression);
}
if (binding.kind === 'derived') {
e.constant_binding(node.expression, 'derived state');
}
if (context.state.analysis.runes && binding.kind === 'each') {
e.each_item_invalid_assignment(node);
}
if (binding.kind === 'snippet') {
e.snippet_parameter_assignment(node);
}
}
if (node.name === 'group') {
if (!binding) {
throw new Error('Cannot find declaration for bind:group');
}
}
if (binding?.kind === 'each' && binding.metadata?.inside_rest) {
w.bind_invalid_each_rest(binding.node, binding.node.name);
}
const parent = context.path.at(-1);
if (
parent?.type === 'RegularElement' ||
parent?.type === 'SvelteElement' ||
parent?.type === 'SvelteWindow' ||
parent?.type === 'SvelteDocument' ||
parent?.type === 'SvelteBody'
) {
if (context.state.options.namespace === 'foreign' && node.name !== 'this') {
e.bind_invalid_name(node, node.name, 'Foreign elements only support `bind:this`');
}
if (node.name in binding_properties) {
const property = binding_properties[node.name];
if (property.valid_elements && !property.valid_elements.includes(parent.name)) {
e.bind_invalid_target(
node,
node.name,
property.valid_elements.map((valid_element) => `<${valid_element}>`).join(', ')
);
}
if (property.invalid_elements && property.invalid_elements.includes(parent.name)) {
const valid_bindings = Object.entries(binding_properties)
.filter(([_, binding_property]) => {
return (
binding_property.valid_elements?.includes(parent.name) ||
(!binding_property.valid_elements &&
!binding_property.invalid_elements?.includes(parent.name))
);
})
.map(([property_name]) => property_name)
.sort();
e.bind_invalid_name(
node,
node.name,
`Possible bindings for <${parent.name}> are ${valid_bindings.join(', ')}`
);
}
if (parent.name === 'input' && node.name !== 'this') {
const type = /** @type {import('#compiler').Attribute | undefined} */ (
parent.attributes.find((a) => a.type === 'Attribute' && a.name === 'type')
);
if (type && !is_text_attribute(type)) {
if (node.name !== 'value' || type.value === true) {
e.attribute_invalid_type(type);
}
return; // bind:value can handle dynamic `type` attributes
}
if (node.name === 'checked' && type?.value[0].data !== 'checkbox') {
e.bind_invalid_target(node, node.name, '<input type="checkbox">');
}
if (node.name === 'files' && type?.value[0].data !== 'file') {
e.bind_invalid_target(node, node.name, '<input type="file">');
}
}
if (parent.name === 'select' && node.name !== 'this') {
const multiple = parent.attributes.find(
(a) =>
a.type === 'Attribute' &&
a.name === 'multiple' &&
!is_text_attribute(a) &&
a.value !== true
);
if (multiple) {
e.attribute_invalid_multiple(multiple);
}
}
if (node.name === 'offsetWidth' && SVGElements.includes(parent.name)) {
e.bind_invalid_target(
node,
node.name,
`non-<svg> elements. Use 'clientWidth' for <svg> instead`
);
}
if (ContentEditableBindings.includes(node.name)) {
const contenteditable = /** @type {import('#compiler').Attribute} */ (
parent.attributes.find((a) => a.type === 'Attribute' && a.name === 'contenteditable')
);
if (!contenteditable) {
e.attribute_contenteditable_missing(node);
} else if (!is_text_attribute(contenteditable) && contenteditable.value !== true) {
e.attribute_contenteditable_dynamic(contenteditable);
}
}
} else {
const match = fuzzymatch(node.name, Object.keys(binding_properties));
if (match) {
const property = binding_properties[match];
if (!property.valid_elements || property.valid_elements.includes(parent.name)) {
e.bind_invalid_name(node, node.name, `Did you mean '${match}'?`);
}
}
e.bind_invalid_name(node, node.name);
}
}
},
ExportDefaultDeclaration(node) {
e.module_illegal_default_export(node);
},
ConstTag(node, context) {
const parent = context.path.at(-1);
const grand_parent = context.path.at(-2);
if (
parent?.type !== 'Fragment' ||
(grand_parent?.type !== 'IfBlock' &&
grand_parent?.type !== 'SvelteFragment' &&
grand_parent?.type !== 'Component' &&
grand_parent?.type !== 'SvelteComponent' &&
grand_parent?.type !== 'EachBlock' &&
grand_parent?.type !== 'AwaitBlock' &&
grand_parent?.type !== 'SnippetBlock' &&
((grand_parent?.type !== 'RegularElement' && grand_parent?.type !== 'SvelteElement') ||
!grand_parent.attributes.some((a) => a.type === 'Attribute' && a.name === 'slot')))
) {
e.const_tag_invalid_placement(node);
}
},
ImportDeclaration(node, context) {
if (node.source.value === 'svelte' && context.state.analysis.runes) {
for (const specifier of node.specifiers) {
if (specifier.type === 'ImportSpecifier') {
if (
specifier.imported.name === 'beforeUpdate' ||
specifier.imported.name === 'afterUpdate'
) {
e.runes_mode_invalid_import(specifier, specifier.imported.name);
}
}
}
}
},
LetDirective(node, context) {
const parent = context.path.at(-1);
if (
parent === undefined ||
(parent.type !== 'Component' &&
parent.type !== 'RegularElement' &&
parent.type !== 'SlotElement' &&
parent.type !== 'SvelteElement' &&
parent.type !== 'SvelteComponent' &&
parent.type !== 'SvelteSelf' &&
parent.type !== 'SvelteFragment')
) {
e.let_directive_invalid_placement(node);
}
},
RegularElement(node, context) {
if (node.name === 'textarea' && node.fragment.nodes.length > 0) {
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute' && attribute.name === 'value') {
e.textarea_invalid_content(node);
}
}
}
const binding = context.state.scope.get(node.name);
if (
binding !== null &&
binding.declaration_kind === 'import' &&
binding.references.length === 0
) {
w.component_name_lowercase(node, node.name);
}
validate_element(node, context);
if (context.state.parent_element) {
if (!is_tag_valid_with_parent(node.name, context.state.parent_element)) {
e.node_invalid_placement(node, `<${node.name}>`, context.state.parent_element);
}
}
// can't add form to interactive elements because those are also used by the parser
// to check for the last auto-closing parent.
if (node.name === 'form') {
const path = context.path;
for (let parent of path) {
if (parent.type === 'RegularElement' && parent.name === 'form') {
e.node_invalid_placement(node, `<${node.name}>`, parent.name);
}
}
}
if (interactive_elements.has(node.name)) {
const path = context.path;
for (let parent of path) {
if (
parent.type === 'RegularElement' &&
parent.name === node.name &&
interactive_elements.has(parent.name)
) {
e.node_invalid_placement(node, `<${node.name}>`, parent.name);
}
}
}
if (disallowed_paragraph_contents.includes(node.name)) {
const path = context.path;
for (let parent of path) {
if (parent.type === 'RegularElement' && parent.name === 'p') {
e.node_invalid_placement(node, `<${node.name}>`, parent.name);
}
}
}
if (
context.state.analysis.source[node.end - 2] === '/' &&
context.state.options.namespace !== 'foreign' &&
!VoidElements.includes(node.name) &&
!SVGElements.includes(node.name)
) {
w.element_invalid_self_closing_tag(node, node.name);
}
context.next({
...context.state,
parent_element: node.name
});
},
RenderTag(node, context) {
context.state.analysis.uses_render_tags = true;
const raw_args = unwrap_optional(node.expression).arguments;
for (const arg of raw_args) {
if (arg.type === 'SpreadElement') {
e.render_tag_invalid_spread_argument(arg);
}
}
const callee = unwrap_optional(node.expression).callee;
if (
callee.type === 'MemberExpression' &&
callee.property.type === 'Identifier' &&
['bind', 'apply', 'call'].includes(callee.property.name)
) {
e.render_tag_invalid_call_expression(node);
}
},
IfBlock(node, context) {
validate_block_not_empty(node.consequent, context);
validate_block_not_empty(node.alternate, context);
},
EachBlock(node, context) {
validate_block_not_empty(node.body, context);
validate_block_not_empty(node.fallback, context);
},
AwaitBlock(node, context) {
validate_block_not_empty(node.pending, context);
validate_block_not_empty(node.then, context);
validate_block_not_empty(node.catch, context);
},
KeyBlock(node, context) {
validate_block_not_empty(node.fragment, context);
},
SnippetBlock(node, context) {
validate_block_not_empty(node.body, context);
context.next({ ...context.state, parent_element: null });
const { path } = context;
const parent = path.at(-2);
if (!parent) return;
if (
parent.type === 'Component' &&
parent.attributes.some(
(attribute) =>
(attribute.type === 'Attribute' || attribute.type === 'BindDirective') &&
attribute.name === node.expression.name
)
) {
e.snippet_shadowing_prop(node, node.expression.name);
}
if (node.expression.name !== 'children') return;
if (
parent.type === 'Component' ||
parent.type === 'SvelteComponent' ||
parent.type === 'SvelteSelf'
) {
if (
parent.fragment.nodes.some(
(node) => node.type !== 'SnippetBlock' && (node.type !== 'Text' || node.data.trim())
)
) {
e.snippet_conflict(node);
}
}
},
StyleDirective(node) {
if (node.modifiers.length > 1 || (node.modifiers.length && node.modifiers[0] !== 'important')) {
e.style_directive_invalid_modifier(node);
}
},
SvelteHead(node) {
const attribute = node.attributes[0];
if (attribute) {
e.svelte_head_illegal_attribute(attribute);
}
},
SvelteElement(node, context) {
validate_element(node, context);
context.next({
...context.state,
parent_element: null
});
},
SvelteFragment(node, context) {
const parent = context.path.at(-2);
if (parent?.type !== 'Component' && parent?.type !== 'SvelteComponent') {
e.svelte_fragment_invalid_placement(node);
}
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'slot') {
validate_slot_attribute(context, attribute);
}
} else if (attribute.type !== 'LetDirective') {
e.svelte_fragment_invalid_attribute(attribute);
}
}
},
SlotElement(node) {
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'name') {
if (!is_text_attribute(attribute)) {
e.slot_element_invalid_name(attribute);
}
const slot_name = attribute.value[0].data;
if (slot_name === 'default') {
e.slot_element_invalid_name_default(attribute);
}
}
} else if (attribute.type !== 'SpreadAttribute' && attribute.type !== 'LetDirective') {
e.slot_element_invalid_attribute(attribute);
}
}
},
Component: validate_component,
SvelteComponent: validate_component,
SvelteSelf: validate_component,
Text(node, context) {
if (!node.parent) return;
if (context.state.parent_element && regex_not_whitespace.test(node.data)) {
if (!is_tag_valid_with_parent('#text', context.state.parent_element)) {
e.node_invalid_placement(node, 'Text node', context.state.parent_element);
}
}
},
TitleElement(node) {
const attribute = node.attributes[0];
if (attribute) {
e.title_illegal_attribute(attribute);
}
const child = node.fragment.nodes.find((n) => n.type !== 'Text' && n.type !== 'ExpressionTag');
if (child) {
e.title_invalid_content(child);
}
},
UpdateExpression(node, context) {
validate_assignment(node, node.argument, context.state);
},
ExpressionTag(node, context) {
if (!node.parent) return;
if (context.state.parent_element) {
if (!is_tag_valid_with_parent('#text', context.state.parent_element)) {
e.node_invalid_placement(node, '{expression}', context.state.parent_element);
}
}
}
};
export const validation_legacy = merge(validation, a11y_validators, {
VariableDeclarator(node, { state }) {
ensure_no_module_import_conflict(node, state);
if (node.init?.type !== 'CallExpression') return;
const callee = node.init.callee;
if (
callee.type !== 'Identifier' ||
(callee.name !== '$state' && callee.name !== '$derived' && callee.name !== '$props')
) {
return;
}
if (state.scope.get(callee.name)?.kind !== 'store_sub') {
e.rune_invalid_usage(node.init, callee.name);
}
},
AssignmentExpression(node, { state, path }) {
const parent = path.at(-1);
if (parent && parent.type === 'ConstTag') return;
validate_assignment(node, node.left, state);
},
LabeledStatement(node, { path, state }) {
if (
node.label.name === '$' &&
(state.ast_type !== 'instance' ||
/** @type {import('#compiler').SvelteNode} */ (path.at(-1)).type !== 'Program')
) {
w.reactive_declaration_invalid_placement(node);
}
},
UpdateExpression(node, { state }) {
validate_assignment(node, node.argument, state);
}
});
/**
*
* @param {import('estree').Node} node
* @param {import('../scope').Scope} scope
* @param {string} name
*/
function validate_export(node, scope, name) {
const binding = scope.get(name);
if (!binding) return;
if (binding.kind === 'derived') {
e.derived_invalid_export(node);
}
if ((binding.kind === 'state' || binding.kind === 'frozen_state') && binding.reassigned) {
e.state_invalid_export(node);
}
}
/**
* @param {import('estree').CallExpression} node
* @param {Scope} scope
* @param {import('#compiler').SvelteNode[]} path
* @returns
*/
function validate_call_expression(node, scope, path) {
const rune = get_rune(node, scope);
if (rune === null) return;
const parent = /** @type {import('#compiler').SvelteNode} */ (get_parent(path, -1));
if (rune === '$props') {
if (parent.type === 'VariableDeclarator') return;
e.props_invalid_placement(node);
}
if (rune === '$bindable') {
if (parent.type === 'AssignmentPattern' && path.at(-3)?.type === 'ObjectPattern') {
const declarator = path.at(-4);
if (
declarator?.type === 'VariableDeclarator' &&
get_rune(declarator.init, scope) === '$props'
) {
return;
}
}
e.bindable_invalid_location(node);
}
if (
rune === '$state' ||
rune === '$state.frozen' ||
rune === '$derived' ||
rune === '$derived.by'
) {
if (parent.type === 'VariableDeclarator') return;
if (parent.type === 'PropertyDefinition' && !parent.static && !parent.computed) return;
e.state_invalid_placement(node, rune);
}
if (rune === '$effect' || rune === '$effect.pre') {
if (parent.type !== 'ExpressionStatement') {
e.effect_invalid_placement(node);
}
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
}
if (rune === '$effect.tracking') {
if (node.arguments.length !== 0) {
e.rune_invalid_arguments(node, rune);
}
}
if (rune === '$effect.root') {
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
}
if (rune === '$inspect') {
if (node.arguments.length < 1) {
e.rune_invalid_arguments_length(node, rune, 'one or more arguments');
}
}
if (rune === '$inspect().with') {
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
}
if (rune === '$state.snapshot') {
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
}
if (rune === '$state.is') {
if (node.arguments.length !== 2) {
e.rune_invalid_arguments_length(node, rune, 'exactly two arguments');
}
}
}
/**
* @param {import('estree').VariableDeclarator} node
* @param {import('./types.js').AnalysisState} state
*/
function ensure_no_module_import_conflict(node, state) {
const ids = extract_identifiers(node.id);
for (const id of ids) {
if (
state.scope === state.analysis.instance.scope &&
state.analysis.module.scope.get(id.name)?.declaration_kind === 'import'
) {
e.declaration_duplicate_module_import(node.id);
}
}
}
/**
* @type {import('zimmerframe').Visitors<import('#compiler').SvelteNode, import('./types.js').AnalysisState>}
*/
export const validation_runes_js = {
ImportDeclaration(node) {
if (typeof node.source.value === 'string' && node.source.value.startsWith('svelte/internal')) {
e.import_svelte_internal_forbidden(node);
}
},
ExportSpecifier(node, { state }) {
validate_export(node, state.scope, node.local.name);
},
ExportNamedDeclaration(node, { state, next }) {
if (node.declaration?.type !== 'VariableDeclaration') return;
// visit children, so bindings are correctly initialised
next();
for (const declarator of node.declaration.declarations) {
for (const id of extract_identifiers(declarator.id)) {
validate_export(node, state.scope, id.name);
}
}
},
CallExpression(node, { state, path }) {
if (get_rune(node, state.scope) === '$host') {
e.host_invalid_placement(node);
}
validate_call_expression(node, state.scope, path);
},
VariableDeclarator(node, { state }) {
const init = node.init;
const rune = get_rune(init, state.scope);
if (rune === null) return;
const args = /** @type {import('estree').CallExpression} */ (init).arguments;
if ((rune === '$derived' || rune === '$derived.by') && args.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
} else if (rune === '$state' && args.length > 1) {
e.rune_invalid_arguments_length(node, rune, 'zero or one arguments');
} else if (rune === '$props') {
e.props_invalid_placement(node);
} else if (rune === '$bindable') {
e.bindable_invalid_location(node);
}
},
AssignmentExpression(node, { state }) {
validate_assignment(node, node.left, state);
},
UpdateExpression(node, { state }) {
validate_assignment(node, node.argument, state);
},
ClassBody(node, context) {
/** @type {string[]} */
const private_derived_state = [];
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
definition.key.type === 'PrivateIdentifier' &&
definition.value?.type === 'CallExpression'
) {
const rune = get_rune(definition.value, context.state.scope);
if (rune === '$derived' || rune === '$derived.by') {
private_derived_state.push(definition.key.name);
}
}
}
context.next({
...context.state,
private_derived_state
});
},
ClassDeclaration(node, context) {
// In modules, we allow top-level module scope only, in components, we allow the component scope,
// which is function_depth of 1. With the exception of `new class` which is also not allowed at
// component scope level either.
const allowed_depth = context.state.ast_type === 'module' ? 0 : 1;
if (context.state.scope.function_depth > allowed_depth) {
w.perf_avoid_nested_class(node);
}
},
NewExpression(node, context) {
if (node.callee.type === 'ClassExpression' && context.state.scope.function_depth > 0) {
w.perf_avoid_inline_class(node);
}
}
};
/**
* @param {import('../../errors.js').NodeLike} node
* @param {import('estree').Pattern | import('estree').Expression} argument
* @param {Scope} scope
* @param {boolean} is_binding
*/
function validate_no_const_assignment(node, argument, scope, is_binding) {
if (argument.type === 'ArrayPattern') {
for (const element of argument.elements) {
if (element) {
validate_no_const_assignment(node, element, scope, is_binding);
}
}
} else if (argument.type === 'ObjectPattern') {
for (const element of argument.properties) {
if (element.type === 'Property') {
validate_no_const_assignment(node, element.value, scope, is_binding);
}
}
} else if (argument.type === 'Identifier') {
const binding = scope.get(argument.name);
if (binding?.declaration_kind === 'const' && binding.kind !== 'each') {
// e.invalid_const_assignment(
// node,
// is_binding,
// // This takes advantage of the fact that we don't assign initial for let directives and then/catch variables.
// // If we start doing that, we need another property on the binding to differentiate, or give up on the more precise error message.
// binding.kind !== 'state' &&
// binding.kind !== 'frozen_state' &&
// (binding.kind !== 'normal' || !binding.initial)
// );
// TODO have a more specific error message for assignments to things like `{:then foo}`
const thing = 'constant';
if (is_binding) {
e.constant_binding(node, thing);
} else {
e.constant_assignment(node, thing);
}
}
}
}
/**
* @param {import('estree').AssignmentExpression | import('estree').UpdateExpression} node
* @param {import('estree').Pattern | import('estree').Expression} argument
* @param {import('./types.js').AnalysisState} state
*/
function validate_assignment(node, argument, state) {
validate_no_const_assignment(node, argument, state.scope, false);
if (argument.type === 'Identifier') {
const binding = state.scope.get(argument.name);
if (state.analysis.runes) {
if (binding?.kind === 'derived') {
e.constant_assignment(node, 'derived state');
}
if (binding?.kind === 'each') {
e.each_item_invalid_assignment(node);
}
}
if (binding?.kind === 'snippet') {
e.snippet_parameter_assignment(node);
}
}
let object = /** @type {import('estree').Expression | import('estree').Super} */ (argument);
/** @type {import('estree').Expression | import('estree').PrivateIdentifier | null} */
let property = null;
while (object.type === 'MemberExpression') {
property = object.property;
object = object.object;
}
if (object.type === 'ThisExpression' && property?.type === 'PrivateIdentifier') {
if (state.private_derived_state.includes(property.name)) {
e.constant_assignment(node, 'derived state');
}
}
}
export const validation_runes = merge(validation, a11y_validators, {
ImportDeclaration(node) {
if (typeof node.source.value === 'string' && node.source.value.startsWith('svelte/internal')) {
e.import_svelte_internal_forbidden(node);
}
},
Identifier(node, { path, state }) {
let i = path.length;
let parent = /** @type {import('estree').Expression} */ (path[--i]);
if (
Runes.includes(/** @type {Runes[number]} */ (node.name)) &&
is_reference(node, parent) &&
state.scope.get(node.name) === null &&
state.scope.get(node.name.slice(1)) === null
) {
/** @type {import('estree').Expression} */
let current = node;
let name = node.name;
while (parent.type === 'MemberExpression') {
if (parent.computed) e.rune_invalid_computed_property(parent);
name += `.${/** @type {import('estree').Identifier} */ (parent.property).name}`;
current = parent;
parent = /** @type {import('estree').Expression} */ (path[--i]);
if (!Runes.includes(/** @type {Runes[number]} */ (name))) {
if (name === '$effect.active') {
e.rune_renamed(parent, '$effect.active', '$effect.tracking');
}
e.rune_invalid_name(parent, name);
}
}
if (parent.type !== 'CallExpression') {
e.rune_missing_parentheses(current);
}
}
},
LabeledStatement(node, { path }) {
if (node.label.name !== '$' || path.at(-1)?.type !== 'Program') return;
e.legacy_reactive_statement_invalid(node);
},
ExportNamedDeclaration(node, { state, next }) {
if (state.ast_type === 'module') {
if (node.declaration?.type !== 'VariableDeclaration') return;
// visit children, so bindings are correctly initialised
next();
for (const declarator of node.declaration.declarations) {
for (const id of extract_identifiers(declarator.id)) {
validate_export(node, state.scope, id.name);
}
}
} else {
if (node.declaration?.type !== 'VariableDeclaration') return;
if (node.declaration.kind !== 'let') return;
if (state.analysis.instance.scope !== state.scope) return;
e.legacy_export_invalid(node);
}
},
ExportSpecifier(node, { state }) {
if (state.ast_type === 'module') {
validate_export(node, state.scope, node.local.name);
}
},
CallExpression(node, { state, path }) {
const rune = get_rune(node, state.scope);
if (rune === '$bindable' && node.arguments.length > 1) {
e.rune_invalid_arguments_length(node, '$bindable', 'zero or one arguments');
} else if (rune === '$host') {
if (node.arguments.length > 0) {
e.rune_invalid_arguments(node, '$host');
} else if (state.ast_type === 'module' || !state.analysis.custom_element) {
e.host_invalid_placement(node);
}
}
validate_call_expression(node, state.scope, path);
},
EachBlock(node, { next, state }) {
const context = node.context;
if (
context.type === 'Identifier' &&
(context.name === '$state' || context.name === '$derived')
) {
e.state_invalid_placement(node, context.name);
}
next({ ...state });
},
VariableDeclarator(node, { state }) {
ensure_no_module_import_conflict(node, state);
const init = node.init;
const rune = get_rune(init, state.scope);
if (rune === null) return;
const args = /** @type {import('estree').CallExpression} */ (init).arguments;
// TODO some of this is duplicated with above, seems off
if ((rune === '$derived' || rune === '$derived.by') && args.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
} else if (rune === '$state' && args.length > 1) {
e.rune_invalid_arguments_length(node, rune, 'zero or one arguments');
} else if (rune === '$props') {
if (state.has_props_rune) {
e.props_duplicate(node);
}
state.has_props_rune = true;
if (args.length > 0) {
e.rune_invalid_arguments(node, rune);
}
if (node.id.type !== 'ObjectPattern') {
e.props_invalid_identifier(node);
}
if (state.scope !== state.analysis.instance.scope) {
e.props_invalid_placement(node);
}
for (const property of node.id.properties) {
if (property.type === 'Property') {
if (property.computed) {
e.props_invalid_pattern(property);
}
const value =
property.value.type === 'AssignmentPattern' ? property.value.left : property.value;
if (value.type !== 'Identifier') {
e.props_invalid_pattern(property);
}
}
}
}
if (rune === '$derived') {
const arg = args[0];
if (
arg.type === 'CallExpression' &&
(arg.callee.type === 'ArrowFunctionExpression' || arg.callee.type === 'FunctionExpression')
) {
w.derived_iife(node);
}
}
},
SlotElement(node, { state }) {
if (!state.analysis.custom_element) {
w.slot_element_deprecated(node);
}
},
OnDirective(node, { path }) {
const parent_type = path.at(-1)?.type;
// Don't warn on component events; these might not be under the author's control so the warning would be unactionable
if (parent_type === 'RegularElement' || parent_type === 'SvelteElement') {
w.event_directive_deprecated(node, node.name);
}
},
// TODO this is a code smell. need to refactor this stuff
ClassBody: validation_runes_js.ClassBody,
ClassDeclaration: validation_runes_js.ClassDeclaration,
NewExpression: validation_runes_js.NewExpression
});
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