Press n or j to go to the next uncovered block, b, p or k for the previous block.
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6x 6x 6x 6x 172x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 172x 100x 2x 2x 2x 2x 2x 8354x 8354x 8354x 6136x 182x 182x 6136x 8354x 8354x 8354x 8354x 2x 2x 2x 2x 60x 60x 60x 60x 60x 2x 2x 2x 2x 2x 60x 60x 60x 60x 60x 2x 2x 2x 2x 3788x 3788x 3788x 3788x 3788x 3788x 3788x 295x 250x 250x 250x 250x 295x 3788x 3788x 3788x 3788x 3788x 295x 250x 394x 335x 335x 394x 250x 295x 3788x 3788x 3788x 1x 1x 1x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 3787x 330x 293x 329x 454x 454x 37x 37x 405x 293x 293x 3787x 3787x 3788x 293x 293x 3787x 3787x 3787x | import is_reference from 'is-reference';
import { walk } from 'zimmerframe';
import * as e from '../../errors.js';
import * as w from '../../warnings.js';
import {
extract_identifiers,
extract_all_identifiers_from_expression,
extract_paths,
is_event_attribute,
is_text_attribute,
object
} from '../../utils/ast.js';
import * as b from '../../utils/builders.js';
import { MathMLElements, ReservedKeywords, Runes, SVGElements } from '../constants.js';
import { Scope, ScopeRoot, create_scopes, get_rune, set_scope } from '../scope.js';
import { merge } from '../visitors.js';
import { validation_legacy, validation_runes, validation_runes_js } from './validation.js';
import check_graph_for_cycles from './utils/check_graph_for_cycles.js';
import { regex_starts_with_newline } from '../patterns.js';
import { create_attribute, is_element_node } from '../nodes.js';
import { DelegatedEvents, namespace_mathml, namespace_svg } from '../../../constants.js';
import { should_proxy_or_freeze } from '../3-transform/client/utils.js';
import { analyze_css } from './css/css-analyze.js';
import { prune } from './css/css-prune.js';
import { hash } from './utils.js';
import { warn_unused } from './css/css-warn.js';
import { extract_svelte_ignore } from '../../utils/extract_svelte_ignore.js';
/**
* @param {import('#compiler').Script | null} script
* @param {ScopeRoot} root
* @param {boolean} allow_reactive_declarations
* @param {Scope | null} parent
* @returns {import('../types.js').Js}
*/
function js(script, root, allow_reactive_declarations, parent) {
/** @type {import('estree').Program} */
const ast = script?.content ?? {
type: 'Program',
sourceType: 'module',
start: -1,
end: -1,
body: []
};
const { scope, scopes } = create_scopes(ast, root, allow_reactive_declarations, parent);
return { ast, scope, scopes };
}
/**
* @param {string} filename
*/
function get_component_name(filename) {
const parts = filename.split(/[/\\]/);
const basename = /** @type {string} */ (parts.pop());
const last_dir = /** @type {string} */ (parts.at(-1));
let name = basename.replace('.svelte', '');
if (name === 'index' && last_dir && last_dir !== 'src') {
name = last_dir;
}
return name[0].toUpperCase() + name.slice(1);
}
/**
* Checks if given event attribute can be delegated/hoisted and returns the corresponding info if so
* @param {string} event_name
* @param {import('estree').Expression | null} handler
* @param {import('./types').Context} context
* @returns {null | import('#compiler').DelegatedEvent}
*/
function get_delegated_event(event_name, handler, context) {
// Handle delegated event handlers. Bail-out if not a delegated event.
if (!handler || !DelegatedEvents.includes(event_name)) {
return null;
}
// If we are not working with a RegularElement, then bail-out.
const element = context.path.at(-1);
if (element?.type !== 'RegularElement') {
return null;
}
/** @type {import('#compiler').DelegatedEvent} */
const non_hoistable = { type: 'non-hoistable' };
/** @type {import('estree').FunctionExpression | import('estree').FunctionDeclaration | import('estree').ArrowFunctionExpression | null} */
let target_function = null;
let binding = null;
if (element.metadata.has_spread) {
// event attribute becomes part of the dynamic spread array
return non_hoistable;
}
if (handler.type === 'ArrowFunctionExpression' || handler.type === 'FunctionExpression') {
target_function = handler;
} else if (handler.type === 'Identifier') {
binding = context.state.scope.get(handler.name);
if (context.state.analysis.module.scope.references.has(handler.name)) {
// If a binding with the same name is referenced in the module scope (even if not declared there), bail-out
return non_hoistable;
}
if (binding != null) {
for (const { path } of binding.references) {
const parent = path.at(-1);
if (parent == null) {
return non_hoistable;
}
/** @type {import('#compiler').RegularElement | null} */
let element = null;
/** @type {string | null} */
let event_name = null;
if (parent.type === 'OnDirective') {
element = /** @type {import('#compiler').RegularElement} */ (path.at(-2));
event_name = parent.name;
} else if (
parent.type === 'ExpressionTag' &&
is_event_attribute(/** @type {import('#compiler').Attribute} */ (path.at(-2)))
) {
element = /** @type {import('#compiler').RegularElement} */ (path.at(-3));
const attribute = /** @type {import('#compiler').Attribute} */ (path.at(-2));
event_name = get_attribute_event_name(attribute.name);
}
if (element && event_name) {
if (
element.type !== 'RegularElement' ||
determine_element_spread(element).metadata.has_spread ||
!DelegatedEvents.includes(event_name)
) {
return non_hoistable;
}
} else if (parent.type !== 'FunctionDeclaration' && parent.type !== 'VariableDeclarator') {
return non_hoistable;
}
}
}
// If the binding is exported, bail-out
if (context.state.analysis.exports.find((node) => node.name === handler.name)) {
return non_hoistable;
}
if (binding !== null && binding.initial !== null && !binding.mutated && !binding.is_called) {
const binding_type = binding.initial.type;
if (
binding_type === 'ArrowFunctionExpression' ||
binding_type === 'FunctionDeclaration' ||
binding_type === 'FunctionExpression'
) {
target_function = binding.initial;
}
}
}
// If we can't find a function, bail-out
if (target_function == null) {
return non_hoistable;
}
// If the function is marked as non-hoistable, bail-out
if (target_function.metadata.hoistable === 'impossible') {
return non_hoistable;
}
// If the function has more than one arg, then bail-out
if (target_function.params.length > 1) {
return non_hoistable;
}
const visited_references = new Set();
const scope = target_function.metadata.scope;
for (const [reference] of scope.references) {
// Bail-out if the arguments keyword is used
if (reference === 'arguments') {
return non_hoistable;
}
const binding = scope.get(reference);
const local_binding = context.state.scope.get(reference);
// If we are referencing a binding that is shadowed in another scope then bail out.
if (local_binding !== null && binding !== null && local_binding.node !== binding.node) {
return non_hoistable;
}
// If we have multiple references to the same store using $ prefix, bail out.
if (
binding !== null &&
binding.kind === 'store_sub' &&
visited_references.has(reference.slice(1))
) {
return non_hoistable;
}
// If we reference the index within an each block, then bail-out.
if (binding !== null && binding.initial?.type === 'EachBlock') {
return non_hoistable;
}
if (
binding !== null &&
// Bail-out if the the binding is a rest param
(binding.declaration_kind === 'rest_param' ||
// Bail-out if we reference anything from the EachBlock (for now) that mutates in non-runes mode,
(((!context.state.analysis.runes && binding.kind === 'each') ||
// or any normal not reactive bindings that are mutated.
binding.kind === 'normal' ||
// or any reactive imports (those are rewritten) (can only happen in legacy mode)
binding.kind === 'legacy_reactive_import') &&
binding.mutated))
) {
return non_hoistable;
}
visited_references.add(reference);
}
return { type: 'hoistable', function: target_function };
}
/**
* @param {import('estree').Program} ast
* @param {import('#compiler').ValidatedModuleCompileOptions} options
* @returns {import('../types.js').Analysis}
*/
export function analyze_module(ast, options) {
const { scope, scopes } = create_scopes(ast, new ScopeRoot(), false, null);
for (const [name, references] of scope.references) {
if (name[0] !== '$' || ReservedKeywords.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
}
walk(
/** @type {import('estree').Node} */ (ast),
{ scope, analysis: { runes: true } },
// @ts-expect-error TODO clean this mess up
merge(set_scope(scopes), validation_runes_js, runes_scope_js_tweaker)
);
return {
module: { ast, scope, scopes },
name: options.filename || 'module',
accessors: false,
runes: true,
immutable: true
};
}
/**
* @param {import('#compiler').Root} root
* @param {string} source
* @param {import('#compiler').ValidatedCompileOptions} options
* @returns {import('../types.js').ComponentAnalysis}
*/
export function analyze_component(root, source, options) {
const scope_root = new ScopeRoot();
const module = js(root.module, scope_root, false, null);
const instance = js(root.instance, scope_root, true, module.scope);
const { scope, scopes } = create_scopes(root.fragment, scope_root, false, instance.scope);
/** @type {import('../types.js').Template} */
const template = { ast: root.fragment, scope, scopes };
// create synthetic bindings for store subscriptions
for (const [name, references] of module.scope.references) {
if (name[0] !== '$' || ReservedKeywords.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
const store_name = name.slice(1);
const declaration = instance.scope.get(store_name);
// If we're not in legacy mode through the compiler option, assume the user
// is referencing a rune and not a global store.
if (
options.runes === false ||
!Runes.includes(/** @type {any} */ (name)) ||
(declaration !== null &&
// const state = $state(0) is valid
get_rune(declaration.initial, instance.scope) === null &&
// allow `import { derived } from 'svelte/store'` in the same file as `const x = $derived(..)` because one is not a subscription to the other
!(
name === '$derived' &&
declaration.initial?.type === 'ImportDeclaration' &&
declaration.initial.source.value === 'svelte/store'
))
) {
let is_nested_store_subscription_node = undefined;
search: for (const reference of references) {
for (let i = reference.path.length - 1; i >= 0; i--) {
const scope =
scopes.get(reference.path[i]) ||
module.scopes.get(reference.path[i]) ||
instance.scopes.get(reference.path[i]);
if (scope) {
const owner = scope?.owner(store_name);
if (!!owner && owner !== module.scope && owner !== instance.scope) {
is_nested_store_subscription_node = reference.node;
break search;
}
break;
}
}
}
if (is_nested_store_subscription_node) {
e.store_invalid_scoped_subscription(is_nested_store_subscription_node);
}
if (options.runes !== false) {
if (declaration === null && /[a-z]/.test(store_name[0])) {
e.global_reference_invalid(references[0].node, name);
} else if (declaration !== null && Runes.includes(/** @type {any} */ (name))) {
for (const { node, path } of references) {
if (path.at(-1)?.type === 'CallExpression') {
w.store_rune_conflict(node, store_name);
}
}
}
}
if (module.ast) {
for (const { node, path } of references) {
// if the reference is inside context="module", error. this is a bit hacky but it works
if (
/** @type {number} */ (node.start) > /** @type {number} */ (module.ast.start) &&
/** @type {number} */ (node.end) < /** @type {number} */ (module.ast.end) &&
// const state = $state(0) is valid
get_rune(/** @type {import('estree').Node} */ (path.at(-1)), module.scope) === null
) {
e.store_invalid_subscription(node);
}
}
}
const binding = instance.scope.declare(b.id(name), 'store_sub', 'synthetic');
binding.references = references;
instance.scope.references.set(name, references);
module.scope.references.delete(name);
}
}
const component_name = get_component_name(options.filename ?? 'Component');
const runes =
options.runes ??
Array.from(module.scope.references).some(([name]) => Runes.includes(/** @type {any} */ (name)));
// TODO remove all the ?? stuff, we don't need it now that we're validating the config
/** @type {import('../types.js').ComponentAnalysis} */
const analysis = {
name: module.scope.generate(options.name ?? component_name),
root: scope_root,
module,
instance,
template,
elements: [],
runes,
immutable: runes || options.immutable,
exports: [],
uses_props: false,
uses_rest_props: false,
uses_slots: false,
uses_component_bindings: false,
uses_render_tags: false,
needs_context: false,
needs_props: false,
event_directive_node: null,
uses_event_attributes: false,
custom_element: options.customElementOptions ?? options.customElement,
inject_styles: options.css === 'injected' || options.customElement,
accessors: options.customElement
? true
: (runes ? false : !!options.accessors) ||
// because $set method needs accessors
!!options.legacy?.componentApi,
reactive_statements: new Map(),
binding_groups: new Map(),
slot_names: new Map(),
top_level_snippets: [],
css: {
ast: root.css,
hash: root.css
? options.cssHash({
css: root.css.content.styles,
filename: options.filename ?? '<unknown>',
name: component_name,
hash
})
: '',
keyframes: []
},
source
};
if (root.options) {
for (const attribute of root.options.attributes) {
if (attribute.name === 'accessors') {
w.options_deprecated_accessors(attribute);
}
if (attribute.name === 'customElement' && !options.customElement) {
w.options_missing_custom_element(attribute);
}
if (attribute.name === 'immutable') {
w.options_deprecated_immutable(attribute);
}
}
}
if (analysis.runes) {
const props_refs = module.scope.references.get('$$props');
if (props_refs) {
e.legacy_props_invalid(props_refs[0].node);
}
const rest_props_refs = module.scope.references.get('$$restProps');
if (rest_props_refs) {
e.legacy_rest_props_invalid(rest_props_refs[0].node);
}
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {import('./types').AnalysisState} */
const state = {
scope,
analysis,
options,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
parent_element: null,
has_props_rune: false,
component_slots: new Set(),
expression: null,
private_derived_state: [],
function_depth: scope.function_depth,
ignores: new Set()
};
walk(
/** @type {import('#compiler').SvelteNode} */ (ast),
state,
merge(set_scope(scopes), validation_runes, runes_scope_tweaker, common_visitors)
);
}
// warn on any nonstate declarations that are a) reassigned and b) referenced in the template
for (const scope of [module.scope, instance.scope]) {
outer: for (const [name, binding] of scope.declarations) {
if (binding.kind === 'normal' && binding.reassigned) {
inner: for (const { path } of binding.references) {
if (path[0].type !== 'Fragment') continue;
for (let i = 1; i < path.length; i += 1) {
const type = path[i].type;
if (
type === 'FunctionDeclaration' ||
type === 'FunctionExpression' ||
type === 'ArrowFunctionExpression'
) {
continue inner;
}
// bind:this doesn't need to be a state reference if it will never change
if (
type === 'BindDirective' &&
/** @type {import('#compiler').BindDirective} */ (path[i]).name === 'this'
) {
for (let j = i - 1; j >= 0; j -= 1) {
const type = path[j].type;
if (
type === 'IfBlock' ||
type === 'EachBlock' ||
type === 'AwaitBlock' ||
type === 'KeyBlock'
) {
w.non_reactive_update(binding.node, name);
continue outer;
}
}
continue inner;
}
}
w.non_reactive_update(binding.node, name);
continue outer;
}
}
}
}
} else {
instance.scope.declare(b.id('$$props'), 'rest_prop', 'synthetic');
instance.scope.declare(b.id('$$restProps'), 'rest_prop', 'synthetic');
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {import('./types').LegacyAnalysisState} */
const state = {
scope,
analysis,
options,
parent_element: null,
has_props_rune: false,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
instance_scope: instance.scope,
reactive_statement: null,
reactive_statements: analysis.reactive_statements,
component_slots: new Set(),
expression: null,
private_derived_state: [],
function_depth: scope.function_depth,
ignores: new Set()
};
walk(
/** @type {import('#compiler').SvelteNode} */ (ast),
state,
// @ts-expect-error TODO
merge(set_scope(scopes), validation_legacy, legacy_scope_tweaker, common_visitors)
);
}
for (const [name, binding] of instance.scope.declarations) {
if (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
binding.node.name !== '$$props'
) {
const references = binding.references.filter(
(r) => r.node !== binding.node && r.path.at(-1)?.type !== 'ExportSpecifier'
);
if (!references.length && !instance.scope.declarations.has(`$${name}`)) {
w.export_let_unused(binding.node, name);
}
}
}
analysis.reactive_statements = order_reactive_statements(analysis.reactive_statements);
}
if (analysis.event_directive_node && analysis.uses_event_attributes) {
e.mixed_event_handler_syntaxes(
analysis.event_directive_node,
analysis.event_directive_node.name
);
}
if (analysis.uses_render_tags && (analysis.uses_slots || analysis.slot_names.size > 0)) {
e.slot_snippet_conflict(analysis.slot_names.values().next().value);
}
if (analysis.css.ast) {
analyze_css(analysis.css.ast, analysis);
// mark nodes as scoped/unused/empty etc
for (const element of analysis.elements) {
prune(analysis.css.ast, element);
}
if (
!analysis.css.ast.content.comment ||
!extract_svelte_ignore(analysis.css.ast.content.comment.data).includes('css_unused_selector')
) {
warn_unused(analysis.css.ast);
}
outer: for (const element of analysis.elements) {
if (element.metadata.scoped) {
// Dynamic elements in dom mode always use spread for attributes and therefore shouldn't have a class attribute added to them
// TODO this happens during the analysis phase, which shouldn't know anything about client vs server
if (element.type === 'SvelteElement' && options.generate === 'client') continue;
/** @type {import('#compiler').Attribute | undefined} */
let class_attribute = undefined;
for (const attribute of element.attributes) {
if (attribute.type === 'SpreadAttribute') {
// The spread method appends the hash to the end of the class attribute on its own
continue outer;
}
if (attribute.type !== 'Attribute') continue;
if (attribute.name.toLowerCase() !== 'class') continue;
class_attribute = attribute;
}
if (class_attribute && class_attribute.value !== true) {
const chunks = class_attribute.value;
if (chunks.length === 1 && chunks[0].type === 'Text') {
chunks[0].data += ` ${analysis.css.hash}`;
} else {
chunks.push({
type: 'Text',
data: ` ${analysis.css.hash}`,
raw: ` ${analysis.css.hash}`,
start: -1,
end: -1,
parent: null
});
}
} else {
element.attributes.push(
create_attribute('class', -1, -1, [
{
type: 'Text',
data: analysis.css.hash,
raw: analysis.css.hash,
parent: null,
start: -1,
end: -1
}
])
);
}
}
}
}
// TODO
// analysis.stylesheet.warn_on_unused_selectors(analysis);
return analysis;
}
/** @type {import('./types').Visitors<import('./types').LegacyAnalysisState>} */
const legacy_scope_tweaker = {
LabeledStatement(node, { next, path, state }) {
if (
state.ast_type !== 'instance' ||
node.label.name !== '$' ||
/** @type {import('#compiler').SvelteNode} */ (path.at(-1)).type !== 'Program'
) {
return next();
}
// Find all dependencies of this `$: {...}` statement
/** @type {import('../types.js').ReactiveStatement} */
const reactive_statement = {
assignments: new Set(),
dependencies: []
};
next({ ...state, reactive_statement, function_depth: state.scope.function_depth + 1 });
// Every referenced binding becomes a dependency, unless it's on
// the left-hand side of an `=` assignment
for (const [name, nodes] of state.scope.references) {
const binding = state.scope.get(name);
if (binding === null) continue;
for (const { node, path } of nodes) {
/** @type {import('estree').Expression} */
let left = node;
let i = path.length - 1;
let parent = /** @type {import('estree').Expression} */ (path.at(i));
while (parent.type === 'MemberExpression') {
left = parent;
parent = /** @type {import('estree').Expression} */ (path.at(--i));
}
if (
parent.type === 'AssignmentExpression' &&
parent.operator === '=' &&
parent.left === left
) {
continue;
}
reactive_statement.dependencies.push(binding);
break;
}
}
state.reactive_statements.set(node, reactive_statement);
// Ideally this would be in the validation file, but that isn't possible because this visitor
// calls "next" before setting the reactive statements.
if (
reactive_statement.dependencies.length &&
reactive_statement.dependencies.every(
(d) => d.scope === state.analysis.module.scope && d.declaration_kind !== 'const'
)
) {
w.reactive_declaration_module_script(node);
}
if (
node.body.type === 'ExpressionStatement' &&
node.body.expression.type === 'AssignmentExpression'
) {
let ids = extract_identifiers(node.body.expression.left);
if (node.body.expression.left.type === 'MemberExpression') {
const id = object(node.body.expression.left);
if (id !== null) {
ids = [id];
}
}
for (const id of ids) {
const binding = state.scope.get(id.name);
if (binding?.kind === 'legacy_reactive') {
// TODO does this include `let double; $: double = x * 2`?
binding.legacy_dependencies = Array.from(reactive_statement.dependencies);
}
}
}
},
AssignmentExpression(node, { state, next }) {
if (state.reactive_statement) {
const id = node.left.type === 'MemberExpression' ? object(node.left) : node.left;
if (id !== null) {
for (const id of extract_identifiers(node.left)) {
const binding = state.scope.get(id.name);
if (binding) {
state.reactive_statement.assignments.add(binding);
}
}
}
}
next();
},
UpdateExpression(node, { state, next }) {
if (state.reactive_statement) {
const id = node.argument.type === 'MemberExpression' ? object(node.argument) : node.argument;
if (id?.type === 'Identifier') {
const binding = state.scope.get(id.name);
if (binding) {
state.reactive_statement.assignments.add(binding);
}
}
}
next();
},
Identifier(node, { state, path }) {
const parent = /** @type {import('estree').Node} */ (path.at(-1));
if (is_reference(node, parent)) {
if (node.name === '$$props') {
state.analysis.uses_props = true;
}
if (node.name === '$$restProps') {
state.analysis.uses_rest_props = true;
}
if (node.name === '$$slots') {
state.analysis.uses_slots = true;
}
let binding = state.scope.get(node.name);
if (binding?.kind === 'store_sub') {
// get the underlying store to mark it as reactive in case it's mutated
binding = state.scope.get(node.name.slice(1));
}
if (
binding !== null &&
binding.kind === 'normal' &&
((binding.scope === state.instance_scope && binding.declaration_kind !== 'function') ||
binding.declaration_kind === 'import')
) {
if (binding.declaration_kind === 'import') {
if (
binding.mutated &&
// TODO could be more fine-grained - not every mention in the template implies a state binding
(state.reactive_statement || state.ast_type === 'template') &&
parent.type === 'MemberExpression'
) {
binding.kind = 'legacy_reactive_import';
}
} else if (
binding.mutated &&
// TODO could be more fine-grained - not every mention in the template implies a state binding
(state.reactive_statement || state.ast_type === 'template')
) {
binding.kind = 'state';
} else if (
state.reactive_statement &&
parent.type === 'AssignmentExpression' &&
parent.left === binding.node
) {
binding.kind = 'derived';
} else {
let idx = -1;
let ancestor = path.at(idx);
while (ancestor) {
if (ancestor.type === 'EachBlock') {
// Ensures that the array is reactive when only its entries are mutated
// TODO: this doesn't seem correct. We should be checking at the points where
// the identifier (the each expression) is used in a way that makes it reactive.
// This just forces the collection identifier to always be reactive even if it's
// not.
if (ancestor.expression === (idx === -1 ? node : path.at(idx + 1))) {
binding.kind = 'state';
break;
}
}
ancestor = path.at(--idx);
}
}
}
}
},
ExportNamedDeclaration(node, { next, state }) {
if (state.ast_type !== 'instance') {
return next();
}
state.analysis.needs_props = true;
if (!node.declaration) {
for (const specifier of node.specifiers) {
const binding = /** @type {import('#compiler').Binding} */ (
state.scope.get(specifier.local.name)
);
if (
binding !== null &&
(binding.kind === 'state' ||
binding.kind === 'frozen_state' ||
(binding.kind === 'normal' &&
(binding.declaration_kind === 'let' || binding.declaration_kind === 'var')))
) {
binding.kind = 'bindable_prop';
if (specifier.exported.name !== specifier.local.name) {
binding.prop_alias = specifier.exported.name;
}
} else {
state.analysis.exports.push({
name: specifier.local.name,
alias: specifier.exported.name
});
}
}
return next();
}
if (
node.declaration.type === 'FunctionDeclaration' ||
node.declaration.type === 'ClassDeclaration'
) {
state.analysis.exports.push({
name: /** @type {import('estree').Identifier} */ (node.declaration.id).name,
alias: null
});
return next();
}
if (node.declaration.type === 'VariableDeclaration') {
if (node.declaration.kind === 'const') {
for (const declarator of node.declaration.declarations) {
for (const node of extract_identifiers(declarator.id)) {
state.analysis.exports.push({ name: node.name, alias: null });
}
}
return next();
}
for (const declarator of node.declaration.declarations) {
for (const id of extract_identifiers(declarator.id)) {
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(id.name));
binding.kind = 'bindable_prop';
}
}
}
},
StyleDirective(node, { state }) {
// the case for node.value different from true is already covered by the Identifier visitor
if (node.value === true) {
// get the binding for node.name and change the binding to state
let binding = state.scope.get(node.name);
if (binding?.mutated && binding.kind === 'normal') {
binding.kind = 'state';
}
}
}
};
/** @type {import('zimmerframe').Visitors<import('#compiler').SvelteNode, { scope: Scope, analysis: { runes: true } }>} */
const runes_scope_js_tweaker = {
VariableDeclarator(node, { state }) {
if (node.init?.type !== 'CallExpression') return;
const rune = get_rune(node.init, state.scope);
if (rune === null) return;
const callee = node.init.callee;
if (callee.type !== 'Identifier' && callee.type !== 'MemberExpression') return;
if (
rune !== '$state' &&
rune !== '$state.frozen' &&
rune !== '$derived' &&
rune !== '$derived.by'
)
return;
for (const path of extract_paths(node.id)) {
// @ts-ignore this fails in CI for some insane reason
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(path.node.name));
binding.kind =
rune === '$state' ? 'state' : rune === '$state.frozen' ? 'frozen_state' : 'derived';
}
}
};
/** @type {import('./types').Visitors} */
const runes_scope_tweaker = {
CallExpression(node, { state, next }) {
const rune = get_rune(node, state.scope);
// `$inspect(foo)` should not trigger the `static-state-reference` warning
if (rune === '$inspect') {
next({ ...state, function_depth: state.function_depth + 1 });
}
},
VariableDeclarator(node, { state }) {
const init = node.init;
if (!init || init.type !== 'CallExpression') return;
const rune = get_rune(init, state.scope);
if (rune === null) return;
const callee = init.callee;
if (callee.type !== 'Identifier' && callee.type !== 'MemberExpression') return;
if (
rune !== '$state' &&
rune !== '$state.frozen' &&
rune !== '$derived' &&
rune !== '$derived.by' &&
rune !== '$props'
)
return;
for (const path of extract_paths(node.id)) {
// @ts-ignore this fails in CI for some insane reason
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(path.node.name));
binding.kind =
rune === '$state'
? 'state'
: rune === '$state.frozen'
? 'frozen_state'
: rune === '$derived' || rune === '$derived.by'
? 'derived'
: path.is_rest
? 'rest_prop'
: 'prop';
}
if (rune === '$props') {
state.analysis.needs_props = true;
for (const property of /** @type {import('estree').ObjectPattern} */ (node.id).properties) {
if (property.type !== 'Property') continue;
const name =
property.value.type === 'AssignmentPattern'
? /** @type {import('estree').Identifier} */ (property.value.left).name
: /** @type {import('estree').Identifier} */ (property.value).name;
const alias =
property.key.type === 'Identifier'
? property.key.name
: /** @type {string} */ (/** @type {import('estree').Literal} */ (property.key).value);
let initial = property.value.type === 'AssignmentPattern' ? property.value.right : null;
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(name));
binding.prop_alias = alias;
// rewire initial from $props() to the actual initial value, stripping $bindable() if necessary
if (
initial?.type === 'CallExpression' &&
initial.callee.type === 'Identifier' &&
initial.callee.name === '$bindable'
) {
binding.initial = /** @type {import('estree').Expression | null} */ (
initial.arguments[0] ?? null
);
binding.kind = 'bindable_prop';
} else {
binding.initial = initial;
}
}
}
},
ExportSpecifier(node, { state }) {
if (state.ast_type !== 'instance') return;
state.analysis.exports.push({
name: node.local.name,
alias: node.exported.name
});
},
ExportNamedDeclaration(node, { next, state }) {
if (!node.declaration || state.ast_type !== 'instance') {
return next();
}
if (
node.declaration.type === 'FunctionDeclaration' ||
node.declaration.type === 'ClassDeclaration'
) {
state.analysis.exports.push({
name: /** @type {import('estree').Identifier} */ (node.declaration.id).name,
alias: null
});
return next();
}
if (node.declaration.type === 'VariableDeclaration' && node.declaration.kind === 'const') {
for (const declarator of node.declaration.declarations) {
for (const node of extract_identifiers(declarator.id)) {
state.analysis.exports.push({ name: node.name, alias: null });
}
}
}
}
};
/**
* @param {import('estree').CallExpression} node
* @param {import('./types').Context} context
* @returns {boolean}
*/
function is_known_safe_call(node, context) {
const callee = node.callee;
// String / Number / BigInt / Boolean casting calls
if (callee.type === 'Identifier') {
const name = callee.name;
const binding = context.state.scope.get(name);
if (
binding === null &&
(name === 'BigInt' || name === 'String' || name === 'Number' || name === 'Boolean')
) {
return true;
}
}
return false;
}
/**
* @param {import('estree').ArrowFunctionExpression | import('estree').FunctionExpression | import('estree').FunctionDeclaration} node
* @param {import('./types').Context} context
*/
const function_visitor = (node, context) => {
// TODO retire this in favour of a more general solution based on bindings
node.metadata = {
// module context -> already hoisted
hoistable: context.state.ast_type === 'module' ? 'impossible' : false,
hoistable_params: [],
scope: context.state.scope
};
context.next({
...context.state,
function_depth: context.state.function_depth + 1
});
};
/**
* A 'safe' identifier means that the `foo` in `foo.bar` or `foo()` will not
* call functions that require component context to exist
* @param {import('estree').Expression | import('estree').Super} expression
* @param {Scope} scope
*/
function is_safe_identifier(expression, scope) {
let node = expression;
while (node.type === 'MemberExpression') node = node.object;
if (node.type !== 'Identifier') return false;
const binding = scope.get(node.name);
if (!binding) return true;
if (binding.kind === 'store_sub') {
return is_safe_identifier({ name: node.name.slice(1), type: 'Identifier' }, scope);
}
return (
binding.declaration_kind !== 'import' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'rest_prop'
);
}
/** @type {import('./types').Visitors} */
const common_visitors = {
_(node, context) {
// @ts-expect-error
const comments = /** @type {import('estree').Comment[]} */ (node.leadingComments);
if (comments) {
/** @type {string[]} */
const ignores = [];
for (const comment of comments) {
ignores.push(...extract_svelte_ignore(comment.value));
}
if (ignores.length > 0) {
// @ts-expect-error see below
node.ignores = new Set([...context.state.ignores, ...ignores]);
}
}
// @ts-expect-error
if (node.ignores) {
context.next({
...context.state,
// @ts-expect-error see below
ignores: node.ignores
});
} else if (context.state.ignores.size > 0) {
// @ts-expect-error
node.ignores = context.state.ignores;
}
},
Fragment(node, context) {
/** @type {string[]} */
let ignores = [];
for (const child of node.nodes) {
if (child.type === 'Text' && child.data.trim() === '') {
continue;
}
if (child.type === 'Comment') {
ignores.push(...extract_svelte_ignore(child.data));
} else {
const combined_ignores = new Set(context.state.ignores);
for (const ignore of ignores) combined_ignores.add(ignore);
if (combined_ignores.size > 0) {
// TODO this is a grotesque hack that's made necessary by the fact that
// we can't call `context.visit(...)` here, because we do the convoluted
// visitor merging thing. I'm increasingly of the view that we should
// rearchitect this stuff and have a single visitor per node. It'd be
// more efficient and much simpler.
// @ts-expect-error
child.ignores = combined_ignores;
}
ignores = [];
}
}
},
Attribute(node, context) {
if (node.value === true) return;
context.next();
node.metadata.dynamic = node.value.some((chunk) => {
if (chunk.type !== 'ExpressionTag') {
return false;
}
if (
chunk.expression.type === 'FunctionExpression' ||
chunk.expression.type === 'ArrowFunctionExpression'
) {
return false;
}
return chunk.metadata.dynamic || chunk.metadata.contains_call_expression;
});
if (is_event_attribute(node)) {
const parent = context.path.at(-1);
if (parent?.type === 'RegularElement' || parent?.type === 'SvelteElement') {
context.state.analysis.uses_event_attributes = true;
}
const expression = node.value[0].expression;
const delegated_event = get_delegated_event(node.name.slice(2), expression, context);
if (delegated_event !== null) {
if (delegated_event.type === 'hoistable') {
delegated_event.function.metadata.hoistable = true;
}
node.metadata.delegated = delegated_event;
}
}
},
ClassDirective(node, context) {
context.next({ ...context.state, expression: node });
},
SpreadAttribute(node, context) {
context.next({ ...context.state, expression: node });
},
SlotElement(node, context) {
let name = 'default';
for (const attr of node.attributes) {
if (attr.type === 'Attribute' && attr.name === 'name' && is_text_attribute(attr)) {
name = attr.value[0].data;
break;
}
}
context.state.analysis.slot_names.set(name, node);
},
StyleDirective(node, context) {
if (node.value === true) {
const binding = context.state.scope.get(node.name);
if (binding?.kind !== 'normal') {
node.metadata.dynamic = true;
}
} else {
context.next();
node.metadata.dynamic = node.value.some(
(node) => node.type === 'ExpressionTag' && node.metadata.dynamic
);
}
},
ExpressionTag(node, context) {
context.next({ ...context.state, expression: node });
},
Identifier(node, context) {
const parent = /** @type {import('estree').Node} */ (context.path.at(-1));
if (!is_reference(node, parent)) return;
if (node.name === '$$slots') {
context.state.analysis.uses_slots = true;
return;
}
const binding = context.state.scope.get(node.name);
// if no binding, means some global variable
if (binding && binding.kind !== 'normal') {
if (context.state.expression) {
context.state.expression.metadata.dynamic = true;
}
if (
context.state.analysis.runes &&
node !== binding.node &&
// If we have $state that can be proxied or frozen and isn't re-assigned, then that means
// it's likely not using a primitive value and thus this warning isn't that helpful.
((binding.kind === 'state' &&
(binding.reassigned ||
(binding.initial?.type === 'CallExpression' &&
binding.initial.arguments.length === 1 &&
binding.initial.arguments[0].type !== 'SpreadElement' &&
!should_proxy_or_freeze(binding.initial.arguments[0], context.state.scope)))) ||
binding.kind === 'frozen_state' ||
binding.kind === 'derived') &&
context.state.function_depth === binding.scope.function_depth
) {
w.state_referenced_locally(node);
}
}
},
CallExpression(node, context) {
if (
context.state.expression?.type === 'ExpressionTag' ||
(context.state.expression?.type === 'SpreadAttribute' && !is_known_safe_call(node, context))
) {
context.state.expression.metadata.contains_call_expression = true;
}
const callee = node.callee;
const rune = get_rune(node, context.state.scope);
if (callee.type === 'Identifier') {
const binding = context.state.scope.get(callee.name);
if (binding !== null) {
binding.is_called = true;
}
if (rune === '$derived') {
// special case — `$derived(foo)` is treated as `$derived(() => foo)`
// for the purposes of identifying static state references
context.next({
...context.state,
function_depth: context.state.function_depth + 1
});
return;
}
}
if (rune === '$effect' || rune === '$effect.pre') {
// `$effect` needs context because Svelte needs to know whether it should re-run
// effects that invalidate themselves, and that's determined by whether we're in runes mode
context.state.analysis.needs_context = true;
} else if (rune === null) {
if (!is_safe_identifier(callee, context.state.scope)) {
context.state.analysis.needs_context = true;
}
}
context.next();
},
MemberExpression(node, context) {
if (context.state.expression) {
context.state.expression.metadata.dynamic = true;
}
if (!is_safe_identifier(node, context.state.scope)) {
context.state.analysis.needs_context = true;
}
context.next();
},
OnDirective(node, { state, path, next }) {
const parent = path.at(-1);
if (parent?.type === 'SvelteElement' || parent?.type === 'RegularElement') {
state.analysis.event_directive_node ??= node;
}
next();
},
BindDirective(node, context) {
let i = context.path.length;
while (i--) {
const parent = context.path[i];
if (
parent.type === 'Component' ||
parent.type === 'SvelteComponent' ||
parent.type === 'SvelteSelf'
) {
if (node.name !== 'this') {
context.state.analysis.uses_component_bindings = true;
}
break;
} else if (is_element_node(parent)) {
break;
}
}
if (node.name !== 'group') return;
// Traverse the path upwards and find all EachBlocks who are (indirectly) contributing to bind:group,
// i.e. one of their declarations is referenced in the binding. This allows group bindings to work
// correctly when referencing a variable declared in an EachBlock by using the index of the each block
// entries as keys.
i = context.path.length;
const each_blocks = [];
const [keypath, expression_ids] = extract_all_identifiers_from_expression(node.expression);
let ids = expression_ids;
while (i--) {
const parent = context.path[i];
if (parent.type === 'EachBlock') {
const references = ids.filter((id) => parent.metadata.declarations.has(id.name));
if (references.length > 0) {
parent.metadata.contains_group_binding = true;
for (const binding of parent.metadata.references) {
binding.mutated = true;
}
each_blocks.push(parent);
ids = ids.filter((id) => !references.includes(id));
ids.push(...extract_all_identifiers_from_expression(parent.expression)[1]);
}
}
}
// The identifiers that make up the binding expression form they key for the binding group.
// If the same identifiers in the same order are used in another bind:group, they will be in the same group.
// (there's an edge case where `bind:group={a[i]}` will be in a different group than `bind:group={a[j]}` even when i == j,
// but this is a limitation of the current static analysis we do; it also never worked in Svelte 4)
const bindings = expression_ids.map((id) => context.state.scope.get(id.name));
let group_name;
outer: for (const [[key, b], group] of context.state.analysis.binding_groups) {
if (b.length !== bindings.length || key !== keypath) continue;
for (let i = 0; i < bindings.length; i++) {
if (bindings[i] !== b[i]) continue outer;
}
group_name = group;
}
if (!group_name) {
group_name = context.state.scope.root.unique('binding_group');
context.state.analysis.binding_groups.set([keypath, bindings], group_name);
}
node.metadata = {
binding_group_name: group_name,
parent_each_blocks: each_blocks
};
},
ArrowFunctionExpression: function_visitor,
FunctionExpression: function_visitor,
FunctionDeclaration: function_visitor,
RegularElement(node, context) {
if (context.state.options.namespace !== 'foreign') {
if (SVGElements.includes(node.name)) node.metadata.svg = true;
else if (MathMLElements.includes(node.name)) node.metadata.mathml = true;
}
determine_element_spread(node);
// Special case: Move the children of <textarea> into a value attribute if they are dynamic
if (
context.state.options.namespace !== 'foreign' &&
node.name === 'textarea' &&
node.fragment.nodes.length > 0
) {
if (node.fragment.nodes.length > 1 || node.fragment.nodes[0].type !== 'Text') {
const first = node.fragment.nodes[0];
if (first.type === 'Text') {
// The leading newline character needs to be stripped because of a qirk:
// It is ignored by browsers if the tag and its contents are set through
// innerHTML, but we're now setting it through the value property at which
// point it is _not_ ignored, so we need to strip it ourselves.
// see https://html.spec.whatwg.org/multipage/syntax.html#element-restrictions
// see https://html.spec.whatwg.org/multipage/grouping-content.html#the-pre-element
first.data = first.data.replace(regex_starts_with_newline, '');
first.raw = first.raw.replace(regex_starts_with_newline, '');
}
node.attributes.push(
create_attribute(
'value',
/** @type {import('#compiler').Text} */ (node.fragment.nodes.at(0)).start,
/** @type {import('#compiler').Text} */ (node.fragment.nodes.at(-1)).end,
// @ts-ignore
node.fragment.nodes
)
);
node.fragment.nodes = [];
}
}
// Special case: single expression tag child of option element -> add "fake" attribute
// to ensure that value types are the same (else for example numbers would be strings)
if (
context.state.options.namespace !== 'foreign' &&
node.name === 'option' &&
node.fragment.nodes?.length === 1 &&
node.fragment.nodes[0].type === 'ExpressionTag' &&
!node.attributes.some(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'value'
)
) {
const child = node.fragment.nodes[0];
node.attributes.push(create_attribute('value', child.start, child.end, [child]));
}
context.state.analysis.elements.push(node);
},
SvelteElement(node, context) {
context.state.analysis.elements.push(node);
// TODO why are we handling the `<svelte:element this="x" />` case? there is no
// reason for someone to use a static value with `<svelte:element>`
if (
context.state.options.namespace !== 'foreign' &&
node.tag.type === 'Literal' &&
typeof node.tag.value === 'string'
) {
if (SVGElements.includes(node.tag.value)) {
node.metadata.svg = true;
return;
}
if (MathMLElements.includes(node.tag.value)) {
node.metadata.mathml = true;
return;
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'xmlns' && is_text_attribute(attribute)) {
node.metadata.svg = attribute.value[0].data === namespace_svg;
node.metadata.mathml = attribute.value[0].data === namespace_mathml;
return;
}
}
}
for (let i = context.path.length - 1; i >= 0; i--) {
const ancestor = context.path[i];
if (
ancestor.type === 'Component' ||
ancestor.type === 'SvelteComponent' ||
ancestor.type === 'SvelteFragment' ||
ancestor.type === 'SnippetBlock'
) {
// Inside a slot or a snippet -> this resets the namespace, so assume the component namespace
node.metadata.svg = context.state.options.namespace === 'svg';
node.metadata.mathml = context.state.options.namespace === 'mathml';
return;
}
if (ancestor.type === 'SvelteElement' || ancestor.type === 'RegularElement') {
node.metadata.svg =
ancestor.type === 'RegularElement' && ancestor.name === 'foreignObject'
? false
: ancestor.metadata.svg;
node.metadata.mathml =
ancestor.type === 'RegularElement' && ancestor.name === 'foreignObject'
? false
: ancestor.metadata.mathml;
return;
}
}
}
};
/**
* @param {import('#compiler').RegularElement} node
*/
function determine_element_spread(node) {
let has_spread = false;
for (const attribute of node.attributes) {
if (!has_spread && attribute.type === 'SpreadAttribute') {
has_spread = true;
}
}
node.metadata.has_spread = has_spread;
return node;
}
/**
* @param {string} event_name
*/
function get_attribute_event_name(event_name) {
if (is_capture_event(event_name)) {
event_name = event_name.slice(0, -7);
}
event_name = event_name.slice(2);
return event_name;
}
/**
* @param {string} name
* @returns boolean
*/
function is_capture_event(name) {
return (
name.endsWith('capture') && name !== 'ongotpointercapture' && name !== 'onlostpointercapture'
);
}
/**
* @param {Map<import('estree').LabeledStatement, import('../types.js').ReactiveStatement>} unsorted_reactive_declarations
*/
function order_reactive_statements(unsorted_reactive_declarations) {
/** @typedef {[import('estree').LabeledStatement, import('../types.js').ReactiveStatement]} Tuple */
/** @type {Map<string, Array<Tuple>>} */
const lookup = new Map();
for (const [node, declaration] of unsorted_reactive_declarations) {
for (const binding of declaration.assignments) {
const statements = lookup.get(binding.node.name) ?? [];
statements.push([node, declaration]);
lookup.set(binding.node.name, statements);
}
}
/** @type {Array<[string, string]>} */
const edges = [];
for (const [, { assignments, dependencies }] of unsorted_reactive_declarations) {
for (const assignment of assignments) {
for (const dependency of dependencies) {
if (!assignments.has(dependency)) {
edges.push([assignment.node.name, dependency.node.name]);
}
}
}
}
const cycle = check_graph_for_cycles(edges);
if (cycle?.length) {
const declaration = /** @type {Tuple[]} */ (lookup.get(cycle[0]))[0];
e.reactive_declaration_cycle(declaration[0], cycle.join(' → '));
}
// We use a map and take advantage of the fact that the spec says insertion order is preserved when iterating
/** @type {Map<import('estree').LabeledStatement, import('../types.js').ReactiveStatement>} */
const reactive_declarations = new Map();
/**
*
* @param {import('estree').LabeledStatement} node
* @param {import('../types.js').ReactiveStatement} declaration
* @returns
*/
const add_declaration = (node, declaration) => {
if ([...reactive_declarations.values()].includes(declaration)) return;
for (const binding of declaration.dependencies) {
if (declaration.assignments.has(binding)) continue;
for (const [node, earlier] of lookup.get(binding.node.name) ?? []) {
add_declaration(node, earlier);
}
}
reactive_declarations.set(node, declaration);
};
for (const [node, declaration] of unsorted_reactive_declarations) {
add_declaration(node, declaration);
}
return reactive_declarations;
}
|