Press n or j to go to the next uncovered block, b, p or k for the previous block.
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8117x 2882x 2882x 5307x 1x 1x 5307x 2881x 8084x 8084x 8084x 8084x 8084x 2x 2x 81x 81x 36x 36x 81x 81x 81x 81x 81x 9x 81x 1x 1x 80x 80x 112x 112x 112x 112x 112x 80x 80x 2x 2x 603x 603x 2x 2x 917x 917x 2x 2x 171x 171x 171x 2x 2x 28x 2x 2x 80x 80x 80x 10x 10x 10x 78x 10x 78x 80x 1x 80x 9x 9x 9x 9x 9x 1x 1x 9x 2x 2x 60x 1x 1x 2x 2x 54x 54x 1x 1x 2x 2x 121x 121x 121x 121x 121x 2x 2x 69x 69x 2x 2x 67x 67x 109x 60x 60x 60x 109x 109x 2x 2x 463x 336x 326x 156x 1x 1x 155x 155x 1x 1x 156x 336x 336x 2x 2x 2x 2x 2x 23354x 23354x 3598x 3598x 2x 2x 33x 33x 1x 1x 32x 32x 32x 1x 1x 2x 2x 318x 2x 2x 6453x 6367x 3930x 3930x 6453x 2x 2x 2x 2x 6018x 6018x 6018x 347x 347x 347x 5635x 277x 6018x 346x 346x 1x 6018x 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 22x 22x 22x 22x 22x 1x 1x 21x 22x 3x 3x 22x 2x 2x 2x 2x 2x 2x 2x 2003x 2003x 2003x 1177x 1177x 1177x 2003x 155x 1022x 2003x 28x 28x 28x 28x 28x 28x 26x 26x 28x 2x 2x 994x 994x 2003x 2003x 2003x 172x 2003x 828x 828x 5x 5x 166x 2003x 134x 2x 2x 132x 132x 2x 2x 134x 162x 1904x 6x 6x 162x 1904x 6x 6x 162x 1904x 16x 16x 162x 1904x 4x 4x 2003x 2x 2x 2x 2x 2x 7237x 7237x 7237x 7711x 7711x 6995x 7711x 1x 1x 7711x 7236x 2x 2x 2x 2x 2x 2x 2x 2x 15x 13x 13x 13x 13x 13x 13x 13x 13x 10x 2x 2x 24x 1x 1x 23x 2x 2x 21x 21x 21x 21x 19x 19x 19x 21x 1x 21x 1x 18x 1x 17x 2x 2x 3x 2x 2x 4x 2x 2x 80x 80x 80x 80x 216x 216x 216x 34x 216x 24x 24x 4x 4x 24x 216x 80x 80x 80x 80x 80x 2x 2x 77x 77x 77x 77x 77x 77x 1x 1x 2x 2x 103x 2x 2x 103x 2x 2x 2x 2x 2x 2x 2x 2x 5038x 5038x 86x 190x 190x 190x 190x 5038x 88x 152x 152x 152x 152x 4952x 3587x 3587x 18x 18x 18x 18x 18x 18x 18x 18x 15x 18x 18x 3587x 5038x 2x 2x 2x 2x 2x 2x 3811x 3811x 3811x 3811x 488x 488x 2x 2x 486x 488x 1x 1x 488x 3796x 3796x 3796x 3796x 3796x 3796x 3803x 1087x 1087x 1087x 3796x 3811x 36x 2x 2x 36x 3811x 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 1982x 1982x 1x 1982x 1x 1x 1x 1x 1x 1980x 1980x 2x 2x 129x 129x 129x 125x 129x 1x 1x 128x 2x 2x 1219x 1219x 1219x 1219x 1219x 1219x 358x 1x 1x 358x 358x 861x 861x 861x 861x 1219x 1x 1219x 1x 860x 159x 1x 1x 158x 158x 158x 159x 1x 1x 157x 159x 157x 159x 1x 1x 156x 159x 240x 224x 224x 224x 224x 224x 224x 224x 240x 156x 856x 1219x 78x 78x 78x 22x 78x 78x 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 } 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') {
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');
}
// TODO handle mutations of non-state/props in runes mode
}
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);
}
}
}
context.next({
...context.state,
parent_element: node.name
});
},
RenderTag(node, context) {
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]);
}
}
}
/**
* @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 (state.analysis.runes && argument.type === 'Identifier') {
const binding = state.scope.get(argument.name);
if (binding?.kind === 'derived') {
error(node, 'invalid-derived-assignment');
}
if (binding?.kind === 'each') {
error(node, 'invalid-each-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');
}
}
},
// 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
});
|