Press n or j to go to the next uncovered block, b, p or k for the previous block.
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2x 193x 193x 193x 193x 193x 629x 629x 629x 407x 407x 407x 407x 407x 629x 192x 192x 629x 193x 193x 192x 1x 1x 191x 191x 192x 192x 8x 192x 183x 6x 6x 177x 177x 177x 183x 5x 5x 172x 172x 172x 183x 1x 4x 2x 2x 2x 4x 2x 1x 1x 2x 1x 1x 1x 183x 193x 1x 1x 193x 2x 2x 2x 2x 2x 3681x 3681x 2194x 2194x 3681x 8x 8x 3681x 2x 2x 2x 2x 2x 2x 2019x 2x 2x 896x 896x 896x 896x 896x 896x 890x 890x 890x 890x 896x 896x 896x 492x 492x 492x 490x 490x 490x 490x 490x 490x 490x 492x 2x 2x 490x 492x 1x 1x 489x 492x 1x 1x 488x 492x 1x 1x 492x 885x 896x 126x 126x 885x 896x 5x 5x 5x 5x 5x 5x 5x 5x 885x 885x 885x 885x 896x 896x 896x 896x 254x 896x 631x 1x 1x 1x 1x 1x 1x 1x 1x 630x 631x 627x 627x 3x 3x 3x 3x 3x 3x 3x 624x 627x 348x 348x 348x 348x 3x 1x 1x 2x 2x 345x 348x 1x 1x 344x 348x 348x 620x 626x 68x 68x 82x 82x 82x 6x 68x 68x 1x 1x 68x 619x 627x 1x 1x 1x 1x 1x 1x 1x 618x 626x 20x 20x 20x 20x 1x 20x 1x 1x 20x 631x 3x 3x 1x 1x 1x 1x 1x 2x 2x 631x 2x 2x 3x 2x 2x 257x 257x 257x 257x 257x 257x 257x 257x 257x 257x 257x 14x 257x 257x 2x 2x 2x 2x 1658x 35x 39x 39x 39x 38x 39x 1x 1x 39x 39x 34x 2x 2x 214x 214x 214x 214x 214x 214x 214x 214x 214x 214x 214x 1x 1x 2x 2x 8212x 24x 5x 1x 1x 5x 23x 8211x 8211x 8211x 8212x 8212x 2x 8212x 1x 1x 1x 1x 1x 1x 1x 1x 8211x 8211x 8211x 8212x 1111x 1111x 8180x 8212x 1367x 1367x 1948x 1948x 1948x 1x 1948x 1x 1x 1948x 1366x 8179x 8212x 2921x 2921x 5358x 1x 1x 5358x 2920x 8178x 8178x 8212x 8212x 8212x 98x 8212x 52x 52x 52x 52x 52x 52x 52x 52x 8178x 8178x 8178x 8178x 8178x 2x 2x 90x 90x 90x 90x 38x 38x 90x 90x 90x 90x 90x 9x 90x 1x 1x 89x 89x 125x 125x 125x 125x 125x 89x 90x 2x 2x 605x 605x 2x 2x 923x 923x 2x 2x 171x 171x 171x 2x 2x 28x 2x 2x 84x 84x 84x 10x 10x 10x 84x 10x 82x 84x 1x 84x 9x 9x 9x 9x 9x 1x 1x 9x 2x 2x 60x 1x 1x 2x 2x 54x 54x 1x 1x 2x 2x 128x 128x 128x 128x 128x 2x 2x 69x 69x 2x 2x 67x 67x 109x 60x 60x 60x 109x 109x 2x 2x 468x 337x 327x 157x 1x 1x 156x 157x 1x 1x 157x 337x 337x 2x 2x 2x 2x 2x 23631x 23631x 3658x 3658x 2x 2x 33x 33x 1x 1x 32x 32x 32x 1x 1x 2x 2x 318x 2x 2x 6556x 6470x 3996x 3996x 6556x 2x 2x 2x 2x 6021x 6021x 6021x 347x 347x 347x 5637x 277x 6021x 346x 346x 1x 6021x 2x 2x 1410x 1410x 1410x 2x 2x 291x 291x 287x 287x 291x 2x 2x 2x 2x 92x 92x 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 2105x 2105x 2105x 1224x 1224x 1224x 2105x 173x 1051x 2105x 36x 36x 36x 36x 36x 36x 34x 34x 36x 2x 2x 1015x 1015x 2105x 2105x 2105x 175x 2105x 846x 846x 5x 5x 169x 2105x 134x 2x 2x 132x 132x 2x 2x 134x 165x 2044x 6x 6x 165x 2044x 6x 6x 165x 2044x 16x 16x 165x 2044x 4x 4x 165x 2001x 3x 1x 1x 3x 2105x 2x 2x 2x 2x 2x 7289x 7289x 7289x 7767x 7767x 7051x 7767x 1x 1x 7767x 7288x 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 78x 78x 78x 78x 212x 212x 212x 34x 212x 24x 24x 4x 4x 24x 212x 78x 78x 78x 78x 78x 2x 2x 75x 75x 75x 75x 75x 75x 1x 1x 2x 2x 111x 2x 2x 111x 2x 2x 2x 2x 2x 2x 2x 2x 5084x 5084x 86x 190x 190x 190x 190x 5084x 88x 152x 152x 152x 152x 4998x 3607x 3607x 18x 18x 18x 18x 18x 18x 18x 18x 15x 18x 18x 3607x 5084x 2x 2x 2x 2x 2x 2x 3846x 3846x 3846x 3846x 2669x 2669x 2669x 504x 2x 2x 502x 504x 1x 1x 504x 2666x 2669x 1x 1x 2669x 3830x 3830x 3830x 3830x 3830x 3830x 3837x 1103x 1103x 1103x 3830x 3846x 36x 2x 2x 36x 3846x 2x 2x 2x 2x 2x 37x 13x 9x 9x 9x 9x 9x 9x 9x 9x 8x 37x 24x 8x 2x 1x 1x 2x 2x 10x 2x 2x 2082x 2082x 1x 2082x 1x 1x 1x 1x 1x 2080x 2080x 2x 2x 135x 135x 135x 129x 135x 1x 1x 134x 2x 2x 1268x 1268x 1268x 1268x 1268x 1268x 368x 1x 1x 368x 368x 900x 900x 900x 900x 1268x 1x 1268x 1x 899x 177x 1x 1x 176x 176x 176x 177x 1x 1x 175x 177x 175x 177x 1x 1x 174x 177x 262x 246x 246x 246x 246x 246x 246x 246x 262x 174x 895x 1268x 80x 80x 80x 22x 80x 80x 2x 2x 141x 141x 141x 1x 141x 1x 1x 2x 2x 15x 15x 15x 2x 2x 290x 290x 290x 287x 287x 2x 2x 2x 2x 2x 2x | import {
disallowed_paragraph_contents,
interactive_elements,
is_tag_valid_with_parent
} from '../../../constants.js';
import { error } from '../../errors.js';
import {
extract_identifiers,
get_parent,
is_expression_attribute,
is_text_attribute,
object,
unwrap_optional
} from '../../utils/ast.js';
import { warn } from '../../warnings.js';
import fuzzymatch from '../1-parse/utils/fuzzymatch.js';
import { binding_properties } from '../bindings.js';
import {
ContentEditableBindings,
EventModifiers,
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'
) {
error(attribute, 'invalid-component-directive');
}
if (
attribute.type === 'OnDirective' &&
(attribute.modifiers.length > 1 || attribute.modifiers.some((m) => m !== 'once'))
) {
error(attribute, 'invalid-event-modifier');
}
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 === '{') error(expression, 'invalid-sequence-expression');
}
}
}
validate_attribute_name(attribute, context);
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;
let has_in_transition = false;
let has_out_transition = false;
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 === '{') error(expression, 'invalid-sequence-expression');
}
}
}
if (regex_illegal_attribute_character.test(attribute.name)) {
error(attribute, 'invalid-attribute-name', attribute.name);
}
if (attribute.name.startsWith('on') && attribute.name.length > 2) {
if (!is_expression) {
error(attribute, 'invalid-event-attribute-value');
}
const value = attribute.value[0].expression;
if (
value.type === 'Identifier' &&
value.name === attribute.name &&
!context.state.scope.get(value.name)
) {
warn(
context.state.analysis.warnings,
attribute,
context.path,
'global-event-reference',
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') {
warn(context.state.analysis.warnings, attribute, context.path, 'avoid-is');
}
const correct_name = react_attributes.get(attribute.name);
if (correct_name) {
warn(
context.state.analysis.warnings,
attribute,
context.path,
'invalid-html-attribute',
attribute.name,
correct_name
);
}
validate_attribute_name(attribute, context);
} else if (attribute.type === 'AnimateDirective') {
const parent = context.path.at(-2);
if (parent?.type !== 'EachBlock') {
error(attribute, 'invalid-animation', 'no-each');
} else if (!parent.key) {
error(attribute, 'invalid-animation', 'each-key');
} else if (
parent.body.nodes.filter(
(n) =>
n.type !== 'Comment' &&
n.type !== 'ConstTag' &&
(n.type !== 'Text' || n.data.trim() !== '')
).length > 1
) {
error(attribute, 'invalid-animation', 'child');
}
if (has_animate_directive) {
error(attribute, 'duplicate-animation');
} else {
has_animate_directive = true;
}
} else if (attribute.type === 'TransitionDirective') {
if ((attribute.outro && has_out_transition) || (attribute.intro && has_in_transition)) {
/** @param {boolean} _in @param {boolean} _out */
const type = (_in, _out) => (_in && _out ? 'transition' : _in ? 'in' : 'out');
error(
attribute,
'duplicate-transition',
type(has_in_transition, has_out_transition),
type(attribute.intro, attribute.outro)
);
}
has_in_transition = has_in_transition || attribute.intro;
has_out_transition = has_out_transition || attribute.outro;
} else if (attribute.type === 'OnDirective') {
let has_passive_modifier = false;
let conflicting_passive_modifier = '';
for (const modifier of attribute.modifiers) {
if (!EventModifiers.includes(modifier)) {
error(attribute, 'invalid-event-modifier', EventModifiers);
}
if (modifier === 'passive') {
has_passive_modifier = true;
} else if (modifier === 'nonpassive' || modifier === 'preventDefault') {
conflicting_passive_modifier = modifier;
}
if (has_passive_modifier && conflicting_passive_modifier) {
error(
attribute,
'invalid-event-modifier-combination',
'passive',
conflicting_passive_modifier
);
}
}
}
}
}
/**
* @param {import('#compiler').Attribute} attribute
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types.js').AnalysisState>} context
*/
function validate_attribute_name(attribute, context) {
if (
attribute.name.includes(':') &&
!attribute.name.startsWith('xmlns:') &&
!attribute.name.startsWith('xlink:') &&
!attribute.name.startsWith('xml:')
) {
warn(context.state.analysis.warnings, attribute, context.path, 'illegal-attribute-character');
}
}
/**
* @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)) {
error(attribute, 'invalid-slot-attribute');
}
if (
owner.type === 'Component' ||
owner.type === 'SvelteComponent' ||
owner.type === 'SvelteSelf'
) {
if (owner !== context.path.at(-2)) {
error(attribute, 'invalid-slot-placement');
}
const name = attribute.value[0].data;
if (context.state.component_slots.has(name)) {
error(attribute, 'duplicate-slot-name', 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;
}
}
error(node, 'invalid-default-slot-content');
}
}
}
} else {
error(attribute, 'invalid-slot-placement');
}
}
/**
* @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()) {
warn(context.state.analysis.warnings, node.nodes[0], context.path, 'empty-block');
}
}
/**
* @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) {
error(node, 'invalid-binding-expression');
}
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)
) {
error(node.expression, 'invalid-binding-value');
}
if (binding.kind === 'derived') {
error(node.expression, 'invalid-derived-binding');
}
if (context.state.analysis.runes && binding.kind === 'each') {
error(node, 'invalid-each-assignment');
}
if (binding.kind === 'snippet') {
error(node, 'invalid-snippet-assignment');
}
}
if (node.name === 'group') {
if (!binding) {
error(node, 'INTERNAL', 'Cannot find declaration for bind:group');
}
}
if (binding?.kind === 'each' && binding.metadata?.inside_rest) {
warn(
context.state.analysis.warnings,
binding.node,
context.path,
'invalid-rest-eachblock-binding',
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') {
error(
node,
'invalid-binding',
node.name,
undefined,
'. 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)) {
error(
node,
'invalid-binding',
node.name,
property.valid_elements.map((valid_element) => `<${valid_element}>`).join(', ')
);
}
if (parent.name === 'input' && node.name !== 'this') {
const type = /** @type {import('#compiler').Attribute | undefined} */ (
parent.attributes.find((a) => a.type === 'Attribute' && a.name === 'type')
);
if (type && !is_text_attribute(type)) {
if (node.name !== 'value' || type.value === true) {
error(type, 'invalid-type-attribute');
}
return; // bind:value can handle dynamic `type` attributes
}
if (node.name === 'checked' && type?.value[0].data !== 'checkbox') {
error(node, 'invalid-binding', node.name, '<input type="checkbox">');
}
if (node.name === 'files' && type?.value[0].data !== 'file') {
error(node, 'invalid-binding', node.name, '<input type="file">');
}
}
if (parent.name === 'select') {
const multiple = parent.attributes.find(
(a) =>
a.type === 'Attribute' &&
a.name === 'multiple' &&
!is_text_attribute(a) &&
a.value !== true
);
if (multiple) {
error(multiple, 'invalid-multiple-attribute');
}
}
if (node.name === 'offsetWidth' && SVGElements.includes(parent.name)) {
error(
node,
'invalid-binding',
node.name,
`non-<svg> elements. Use 'clientWidth' for <svg> instead`
);
}
if (ContentEditableBindings.includes(node.name)) {
const contenteditable = /** @type {import('#compiler').Attribute} */ (
parent.attributes.find((a) => a.type === 'Attribute' && a.name === 'contenteditable')
);
if (!contenteditable) {
error(node, 'missing-contenteditable-attribute');
} else if (!is_text_attribute(contenteditable) && contenteditable.value !== true) {
error(contenteditable, 'dynamic-contenteditable-attribute');
}
}
} else {
const match = fuzzymatch(node.name, Object.keys(binding_properties));
if (match) {
const property = binding_properties[match];
if (!property.valid_elements || property.valid_elements.includes(parent.name)) {
error(node, 'invalid-binding', node.name, undefined, ` (did you mean '${match}'?)`);
}
}
error(node, 'invalid-binding', node.name);
}
}
},
ExportDefaultDeclaration(node) {
error(node, 'default-export');
},
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')))
) {
error(node, 'invalid-const-placement');
}
},
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'
) {
error(specifier, 'invalid-runes-mode-import', 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')
) {
error(node, 'invalid-let-directive-placement');
}
},
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') {
error(node, 'invalid-textarea-content');
}
}
}
const binding = context.state.scope.get(node.name);
if (
binding !== null &&
binding.declaration_kind === 'import' &&
binding.references.length === 0
) {
warn(
context.state.analysis.warnings,
node,
context.path,
'component-name-lowercase',
node.name
);
}
validate_element(node, context);
if (context.state.parent_element) {
if (!is_tag_valid_with_parent(node.name, context.state.parent_element)) {
error(node, 'invalid-node-placement', `<${node.name}>`, context.state.parent_element);
}
}
if (interactive_elements.has(node.name)) {
const path = context.path;
for (let parent of path) {
if (
parent.type === 'RegularElement' &&
parent.name === node.name &&
interactive_elements.has(parent.name)
) {
error(node, 'invalid-node-placement', `<${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') {
error(node, 'invalid-node-placement', `<${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)
) {
warn(
context.state.analysis.warnings,
node,
context.path,
'invalid-self-closing-tag',
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') {
error(arg, 'invalid-render-spread-argument');
}
}
const callee = unwrap_optional(node.expression).callee;
if (
callee.type === 'MemberExpression' &&
callee.property.type === 'Identifier' &&
['bind', 'apply', 'call'].includes(callee.property.name)
) {
error(node, 'invalid-render-call');
}
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) {
error(
node,
'invalid-tag-placement',
'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);
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())
)
) {
error(node, 'conflicting-children-snippet');
}
}
},
StyleDirective(node) {
if (node.modifiers.length > 1 || (node.modifiers.length && node.modifiers[0] !== 'important')) {
error(node, 'invalid-style-directive-modifier');
}
},
SvelteHead(node) {
const attribute = node.attributes[0];
if (attribute) {
error(attribute, 'illegal-svelte-head-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') {
error(node, 'invalid-svelte-fragment-placement');
}
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'slot') {
validate_slot_attribute(context, attribute);
}
} else if (attribute.type !== 'LetDirective') {
error(attribute, 'invalid-svelte-fragment-attribute');
}
}
},
SlotElement(node) {
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'name') {
if (!is_text_attribute(attribute)) {
error(attribute, 'invalid-slot-name', false);
}
const slot_name = attribute.value[0].data;
if (slot_name === 'default') {
error(attribute, 'invalid-slot-name', true);
}
}
} else if (attribute.type !== 'SpreadAttribute' && attribute.type !== 'LetDirective') {
error(attribute, 'invalid-slot-element-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)) {
error(node, 'invalid-node-placement', 'Text node', context.state.parent_element);
}
}
},
TitleElement(node) {
const attribute = node.attributes[0];
if (attribute) {
error(attribute, 'illegal-title-attribute');
}
const child = node.fragment.nodes.find((n) => n.type !== 'Text' && n.type !== 'ExpressionTag');
if (child) {
error(child, 'invalid-title-content');
}
},
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)) {
error(node, 'invalid-node-placement', '{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') {
error(node.init, 'invalid-rune-usage', 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 === '$' &&
(state.ast_type !== 'instance' ||
/** @type {import('#compiler').SvelteNode} */ (path.at(-1)).type !== 'Program')
) {
warn(state.analysis.warnings, node, path, 'no-reactive-declaration');
}
},
UpdateExpression(node, { state }) {
validate_assignment(node, node.argument, state);
}
});
/**
*
* @param {import('estree').Node} node
* @param {import('../scope').Scope} scope
* @param {string} name
*/
function validate_export(node, scope, name) {
const binding = scope.get(name);
if (!binding) return;
if (binding.kind === 'derived') {
error(node, 'invalid-derived-export');
}
if ((binding.kind === 'state' || binding.kind === 'frozen_state') && binding.reassigned) {
error(node, 'invalid-state-export');
}
}
/**
* @param {import('estree').CallExpression} node
* @param {Scope} scope
* @param {import('#compiler').SvelteNode[]} path
* @returns
*/
function validate_call_expression(node, scope, path) {
const rune = get_rune(node, scope);
if (rune === null) return;
const parent = /** @type {import('#compiler').SvelteNode} */ (get_parent(path, -1));
if (rune === '$props') {
if (parent.type === 'VariableDeclarator') return;
error(node, 'invalid-props-location');
}
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;
}
}
error(node, 'invalid-bindable-location');
}
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;
error(node, 'invalid-state-location', rune);
}
if (rune === '$effect' || rune === '$effect.pre') {
if (parent.type !== 'ExpressionStatement') {
error(node, 'invalid-effect-location');
}
if (node.arguments.length !== 1) {
error(node, 'invalid-rune-args-length', rune, [1]);
}
}
if (rune === '$effect.active') {
if (node.arguments.length !== 0) {
error(node, 'invalid-rune-args-length', rune, [0]);
}
}
if (rune === '$effect.root') {
if (node.arguments.length !== 1) {
error(node, 'invalid-rune-args-length', rune, [1]);
}
}
if (rune === '$inspect') {
if (node.arguments.length < 1) {
error(node, 'invalid-rune-args-length', rune, [1, 'more']);
}
}
if (rune === '$inspect().with') {
if (node.arguments.length !== 1) {
error(node, 'invalid-rune-args-length', rune, [1]);
}
}
if (rune === '$state.snapshot') {
if (node.arguments.length !== 1) {
error(node, 'invalid-rune-args-length', rune, [1]);
}
}
}
/**
* @param {import('estree').VariableDeclarator} node
* @param {import('./types.js').AnalysisState} state
*/
function ensure_no_module_import_conflict(node, state) {
const ids = extract_identifiers(node.id);
for (const id of ids) {
if (
state.scope === state.analysis.instance.scope &&
state.analysis.module.scope.get(id.name)?.declaration_kind === 'import'
) {
error(node.id, 'illegal-variable-declaration');
}
}
}
/**
* @type {import('zimmerframe').Visitors<import('#compiler').SvelteNode, import('./types.js').AnalysisState>}
*/
export const validation_runes_js = {
ExportSpecifier(node, { state }) {
validate_export(node, state.scope, node.local.name);
},
ExportNamedDeclaration(node, { state, next }) {
if (node.declaration?.type !== 'VariableDeclaration') return;
// visit children, so bindings are correctly initialised
next();
for (const declarator of node.declaration.declarations) {
for (const id of extract_identifiers(declarator.id)) {
validate_export(node, state.scope, id.name);
}
}
},
CallExpression(node, { state, path }) {
if (get_rune(node, state.scope) === '$host') {
error(node, 'invalid-host-location');
}
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) {
error(node, 'invalid-rune-args-length', rune, [1]);
} else if (rune === '$state' && args.length > 1) {
error(node, 'invalid-rune-args-length', rune, [0, 1]);
} else if (rune === '$props') {
error(node, 'invalid-props-location');
} else if (rune === '$bindable') {
error(node, 'invalid-bindable-location');
}
},
AssignmentExpression(node, { state }) {
validate_assignment(node, node.left, state);
},
UpdateExpression(node, { state }) {
validate_assignment(node, node.argument, state);
},
ClassBody(node, context) {
/** @type {string[]} */
const private_derived_state = [];
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
definition.key.type === 'PrivateIdentifier' &&
definition.value?.type === 'CallExpression'
) {
const rune = get_rune(definition.value, context.state.scope);
if (rune === '$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) {
warn(context.state.analysis.warnings, node, context.path, 'avoid-nested-class');
}
},
NewExpression(node, context) {
if (node.callee.type === 'ClassExpression' && context.state.scope.function_depth > 0) {
warn(context.state.analysis.warnings, node, context.path, 'avoid-inline-class');
}
}
};
/**
* @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') {
error(
node,
'invalid-const-assignment',
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)
);
}
}
}
/**
* @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') {
error(node, 'invalid-derived-assignment');
}
if (binding?.kind === 'each') {
error(node, 'invalid-each-assignment');
}
}
if (binding?.kind === 'snippet') {
error(node, 'invalid-snippet-assignment');
}
}
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)) {
error(node, 'invalid-derived-assignment');
}
}
}
export const validation_runes = merge(validation, a11y_validators, {
LabeledStatement(node, { path }) {
if (node.label.name !== '$' || path.at(-1)?.type !== 'Program') return;
error(node, 'invalid-legacy-reactive-statement');
},
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;
error(node, 'invalid-legacy-export');
}
},
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 === '$bindable' && node.arguments.length > 1) {
error(node, 'invalid-rune-args-length', '$bindable', [0, 1]);
} else if (rune === '$host') {
if (node.arguments.length > 0) {
error(node, 'invalid-rune-args-length', '$host', [0]);
} else if (state.ast_type === 'module' || !state.analysis.custom_element) {
error(node, 'invalid-host-location');
}
}
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')
) {
error(node, 'invalid-state-location', context.name);
}
next({ ...state });
},
VariableDeclarator(node, { state, path }) {
ensure_no_module_import_conflict(node, state);
const init = node.init;
const rune = get_rune(init, state.scope);
if (rune === null) {
if (init?.type === 'Identifier' && init.name === '$props' && !state.scope.get('props')) {
warn(state.analysis.warnings, node, path, 'invalid-props-declaration');
}
return;
}
const args = /** @type {import('estree').CallExpression} */ (init).arguments;
// TODO some of this is duplicated with above, seems off
if ((rune === '$derived' || rune === '$derived.by') && args.length !== 1) {
error(node, 'invalid-rune-args-length', rune, [1]);
} else if (rune === '$state' && args.length > 1) {
error(node, 'invalid-rune-args-length', rune, [0, 1]);
} else if (rune === '$props') {
if (state.has_props_rune) {
error(node, 'duplicate-props-rune');
}
state.has_props_rune = true;
if (args.length > 0) {
error(node, 'invalid-rune-args-length', rune, [0]);
}
if (node.id.type !== 'ObjectPattern') {
error(node, 'invalid-props-id');
}
if (state.scope !== state.analysis.instance.scope) {
error(node, 'invalid-props-location');
}
for (const property of node.id.properties) {
if (property.type === 'Property') {
if (property.computed) {
error(property, 'invalid-props-pattern');
}
const value =
property.value.type === 'AssignmentPattern' ? property.value.left : property.value;
if (value.type !== 'Identifier') {
error(property, 'invalid-props-pattern');
}
}
}
}
if (rune === '$derived') {
const arg = args[0];
if (
arg.type === 'CallExpression' &&
(arg.callee.type === 'ArrowFunctionExpression' || arg.callee.type === 'FunctionExpression')
) {
warn(state.analysis.warnings, node, path, 'derived-iife');
}
}
},
AssignmentPattern(node, { state, path }) {
if (
node.right.type === 'Identifier' &&
node.right.name === '$bindable' &&
!state.scope.get('bindable')
) {
warn(state.analysis.warnings, node, path, 'invalid-bindable-declaration');
}
},
SlotElement(node, { state, path }) {
if (!state.analysis.custom_element) {
warn(state.analysis.warnings, node, path, 'deprecated-slot-element');
}
},
OnDirective(node, { state, 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') {
warn(state.analysis.warnings, node, path, 'deprecated-event-handler', 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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