Press n or j to go to the next uncovered block, b, p or k for the previous block.
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43x 43x 42x 43x 1x 1x 43x 43x 36x 2x 2x 214x 214x 214x 214x 214x 214x 214x 214x 214x 214x 214x 1x 1x 2x 2x 8365x 24x 5x 1x 1x 5x 23x 8364x 8364x 8364x 8365x 8365x 2x 8365x 1x 1x 8364x 8364x 8364x 8365x 1124x 1124x 8333x 8365x 1435x 1435x 2020x 2020x 2020x 1x 2020x 1x 1x 2020x 1434x 8332x 8365x 5003x 5003x 9592x 1x 1x 9592x 5002x 8331x 8331x 8365x 8365x 8365x 98x 8365x 52x 52x 8331x 8331x 8331x 8331x 8331x 2x 2x 105x 105x 105x 105x 39x 39x 105x 105x 105x 105x 105x 9x 105x 1x 1x 104x 104x 166x 166x 166x 166x 166x 104x 105x 2x 2x 620x 620x 2x 2x 930x 930x 2x 2x 171x 171x 171x 2x 2x 30x 2x 2x 89x 89x 89x 89x 89x 10x 10x 10x 86x 10x 86x 89x 1x 89x 9x 9x 9x 9x 9x 1x 1x 9x 2x 2x 64x 1x 1x 2x 2x 54x 54x 1x 1x 2x 2x 136x 136x 136x 136x 136x 2x 2x 69x 69x 2x 2x 67x 67x 109x 60x 60x 60x 109x 109x 2x 2x 471x 340x 330x 159x 1x 1x 158x 159x 1x 1x 159x 340x 340x 2x 2x 2x 2x 2x 24271x 24271x 3744x 3744x 2x 2x 33x 33x 1x 1x 32x 32x 32x 1x 1x 2x 2x 334x 2x 2x 6675x 6588x 4022x 4022x 6675x 2x 2x 2x 2x 6029x 6029x 6029x 347x 347x 347x 5633x 277x 6029x 346x 346x 1x 6029x 2x 2x 1431x 1431x 1431x 2x 2x 305x 305x 301x 301x 305x 2x 2x 2x 2x 96x 96x 2x 2x 2x 2x 2x 2x 2x 2x 24x 24x 24x 24x 24x 1x 1x 23x 24x 3x 3x 24x 2x 2x 2x 2x 2x 2x 2x 2297x 2297x 2297x 1348x 1348x 1348x 2297x 188x 1160x 2297x 38x 38x 38x 38x 38x 38x 36x 36x 38x 2x 2x 1122x 1122x 2297x 2297x 2297x 199x 2297x 935x 935x 5x 5x 187x 2297x 142x 2x 2x 140x 140x 2x 2x 142x 183x 2235x 8x 8x 183x 2235x 6x 6x 183x 2235x 22x 22x 183x 2235x 4x 4x 183x 2193x 5x 1x 1x 5x 2297x 2x 2x 2x 2x 2x 7422x 7422x 7422x 7908x 7908x 7174x 7908x 1x 1x 7908x 7421x 2x 2x 2x 2x 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 82x 82x 82x 82x 224x 224x 224x 36x 224x 26x 26x 4x 4x 26x 224x 82x 82x 82x 82x 82x 2x 2x 79x 79x 79x 79x 79x 79x 1x 1x 2x 2x 117x 2x 2x 117x 2x 2x 2x 2x 2x 2x 2x 2x 5231x 5231x 86x 190x 190x 190x 190x 5231x 90x 154x 154x 154x 154x 5145x 3722x 3722x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 6x 18x 12x 12x 18x 3722x 5231x 2x 2x 2x 2x 2x 2x 3970x 3970x 3970x 3970x 2761x 2761x 2761x 564x 2x 2x 562x 564x 1x 1x 564x 2758x 2761x 1x 1x 2761x 3954x 3954x 3954x 3954x 3954x 3954x 3961x 1133x 1133x 1133x 3954x 3970x 36x 2x 2x 36x 3970x 2x 2x 2x 11373x 11373x 11373x 11373x 11373x 11373x 11373x 1315x 11373x 1279x 1279x 1279x 1279x 1279x 84x 84x 84x 84x 84x 84x 84x 84x 1279x 1279x 2x 2x 1279x 2x 2x 2x 2x 36x 13x 9x 9x 9x 9x 9x 9x 9x 9x 8x 36x 23x 7x 1x 1x 1x 2x 2x 10x 2x 2x 2274x 2274x 1x 2274x 1x 1x 1x 1x 1x 2272x 2272x 2x 2x 139x 139x 139x 133x 139x 1x 1x 138x 2x 2x 1393x 1393x 1393x 1393x 1393x 1393x 1003x 1003x 1003x 1003x 1393x 1x 1393x 1x 1002x 193x 1x 1x 192x 192x 192x 193x 1x 1x 191x 193x 191x 193x 1x 1x 190x 193x 286x 264x 264x 264x 264x 264x 264x 264x 286x 190x 998x 1393x 92x 92x 92x 22x 92x 92x 2x 2x 15x 15x 15x 2x 2x 302x 302x 302x 284x 284x 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_event_attribute,
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').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 && 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);
}
}
}
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 && 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
*/
function validate_slot_attribute(context, attribute) {
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 {
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 (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);
}
}
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);
}
const is_inside_textarea = context.path.find((n) => {
return (
n.type === 'SvelteElement' &&
n.name === 'svelte:element' &&
n.tag.type === 'Literal' &&
n.tag.value === 'textarea'
);
});
if (is_inside_textarea) {
e.tag_invalid_placement(
node,
'inside <textarea> or <svelte:element this="textarea">',
'render'
);
}
},
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 });
if (node.expression.name !== 'children') return;
const { path } = context;
const parent = path.at(-2);
if (!parent) 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.active') {
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');
}
}
}
/**
* @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 = {
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, {
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 += `.${/** @type {import('estree').Identifier} */ (parent.property).name}`;
current = parent;
parent = /** @type {import('estree').Expression} */ (path[--i]);
if (!Runes.includes(/** @type {Runes[number]} */ (name))) {
e.rune_invalid_name(parent, name);
}
}
if (parent.type !== 'CallExpression') {
e.rune_missing_parentheses(current);
}
}
},
LabeledStatement(node, { path }) {
if (node.label.name !== '$' || 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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