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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 2093x 2093x 2093x 1214x 1214x 1214x 2093x 171x 1043x 2093x 36x 36x 36x 36x 36x 36x 34x 34x 36x 2x 2x 1007x 1007x 2093x 2093x 2093x 175x 2093x 838x 838x 5x 5x 169x 2093x 134x 2x 2x 132x 132x 2x 2x 134x 165x 2032x 6x 6x 165x 2032x 6x 6x 165x 2032x 16x 16x 165x 2032x 4x 4x 165x 1989x 3x 1x 1x 3x 2093x 2x 2x 2x 2x 2x 7277x 7277x 7277x 7755x 7755x 7039x 7755x 1x 1x 7755x 7276x 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 5076x 5076x 86x 190x 190x 190x 190x 5076x 88x 152x 152x 152x 152x 4990x 3601x 3601x 18x 18x 18x 18x 18x 18x 18x 18x 15x 18x 18x 3601x 5076x 2x 2x 2x 2x 2x 2x 3838x 3838x 3838x 3838x 2663x 2663x 2663x 498x 2x 2x 496x 498x 1x 1x 498x 2660x 2663x 1x 1x 2663x 3822x 3822x 3822x 3822x 3822x 3822x 3829x 1101x 1101x 1101x 3822x 3838x 36x 2x 2x 36x 3838x 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 2070x 2070x 1x 2070x 1x 1x 1x 1x 1x 2068x 2068x 2x 2x 135x 135x 135x 129x 135x 1x 1x 134x 2x 2x 1258x 1258x 1258x 1258x 1258x 1258x 368x 1x 1x 368x 368x 890x 890x 890x 890x 1258x 1x 1258x 1x 889x 175x 1x 1x 174x 174x 174x 175x 1x 1x 173x 175x 173x 175x 1x 1x 172x 175x 260x 244x 244x 244x 244x 244x 244x 244x 260x 172x 885x 1258x 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 } 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);
}
}
}
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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