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4007x 4007x 4007x 4007x 4007x 4007x 4007x 4007x 4007x 373x 334x 370x 493x 493x 39x 39x 438x 334x 334x 4007x 4007x 4008x 334x 334x 4007x 4007x 4007x | /** @import { Expression, Node, Program } from 'estree' */ /** @import { Binding, AST, SvelteNode, ValidatedCompileOptions, ValidatedModuleCompileOptions } from '#compiler' */ /** @import { AnalysisState, Visitors } from './types' */ /** @import { Analysis, ComponentAnalysis, Js, ReactiveStatement, Template } from '../types' */ import { walk } from 'zimmerframe'; import * as e from '../../errors.js'; import * as w from '../../warnings.js'; import { extract_identifiers, is_text_attribute } from '../../utils/ast.js'; import * as b from '../../utils/builders.js'; import { Scope, ScopeRoot, create_scopes, get_rune, set_scope } from '../scope.js'; import check_graph_for_cycles from './utils/check_graph_for_cycles.js'; import { create_attribute, is_custom_element_node } from '../nodes.js'; import { analyze_css } from './css/css-analyze.js'; import { prune } from './css/css-prune.js'; import { hash, is_rune } from '../../../utils.js'; import { warn_unused } from './css/css-warn.js'; import { extract_svelte_ignore } from '../../utils/extract_svelte_ignore.js'; import { ignore_map, ignore_stack, pop_ignore, push_ignore } from '../../state.js'; import { ArrowFunctionExpression } from './visitors/ArrowFunctionExpression.js'; import { AssignmentExpression } from './visitors/AssignmentExpression.js'; import { Attribute } from './visitors/Attribute.js'; import { AwaitBlock } from './visitors/AwaitBlock.js'; import { BindDirective } from './visitors/BindDirective.js'; import { CallExpression } from './visitors/CallExpression.js'; import { ClassBody } from './visitors/ClassBody.js'; import { ClassDeclaration } from './visitors/ClassDeclaration.js'; import { ClassDirective } from './visitors/ClassDirective.js'; import { Component } from './visitors/Component.js'; import { ConstTag } from './visitors/ConstTag.js'; import { DebugTag } from './visitors/DebugTag.js'; import { EachBlock } from './visitors/EachBlock.js'; import { ExportDefaultDeclaration } from './visitors/ExportDefaultDeclaration.js'; import { ExportNamedDeclaration } from './visitors/ExportNamedDeclaration.js'; import { ExportSpecifier } from './visitors/ExportSpecifier.js'; import { ExpressionStatement } from './visitors/ExpressionStatement.js'; import { ExpressionTag } from './visitors/ExpressionTag.js'; import { FunctionDeclaration } from './visitors/FunctionDeclaration.js'; import { FunctionExpression } from './visitors/FunctionExpression.js'; import { HtmlTag } from './visitors/HtmlTag.js'; import { Identifier } from './visitors/Identifier.js'; import { IfBlock } from './visitors/IfBlock.js'; import { ImportDeclaration } from './visitors/ImportDeclaration.js'; import { KeyBlock } from './visitors/KeyBlock.js'; import { LabeledStatement } from './visitors/LabeledStatement.js'; import { LetDirective } from './visitors/LetDirective.js'; import { MemberExpression } from './visitors/MemberExpression.js'; import { NewExpression } from './visitors/NewExpression.js'; import { OnDirective } from './visitors/OnDirective.js'; import { RegularElement } from './visitors/RegularElement.js'; import { RenderTag } from './visitors/RenderTag.js'; import { SlotElement } from './visitors/SlotElement.js'; import { SnippetBlock } from './visitors/SnippetBlock.js'; import { SpreadAttribute } from './visitors/SpreadAttribute.js'; import { StyleDirective } from './visitors/StyleDirective.js'; import { SvelteBody } from './visitors/SvelteBody.js'; import { SvelteComponent } from './visitors/SvelteComponent.js'; import { SvelteDocument } from './visitors/SvelteDocument.js'; import { SvelteElement } from './visitors/SvelteElement.js'; import { SvelteFragment } from './visitors/SvelteFragment.js'; import { SvelteHead } from './visitors/SvelteHead.js'; import { SvelteSelf } from './visitors/SvelteSelf.js'; import { SvelteWindow } from './visitors/SvelteWindow.js'; import { TaggedTemplateExpression } from './visitors/TaggedTemplateExpression.js'; import { Text } from './visitors/Text.js'; import { TitleElement } from './visitors/TitleElement.js'; import { UpdateExpression } from './visitors/UpdateExpression.js'; import { UseDirective } from './visitors/UseDirective.js'; import { VariableDeclarator } from './visitors/VariableDeclarator.js'; import is_reference from 'is-reference'; import { mark_subtree_dynamic } from './visitors/shared/fragment.js'; /** * @type {Visitors} */ const visitors = { _(node, { state, next, path }) { const parent = path.at(-1); /** @type {string[]} */ const ignores = []; if (parent?.type === 'Fragment' && node.type !== 'Comment' && node.type !== 'Text') { const idx = parent.nodes.indexOf(/** @type {any} */ (node)); for (let i = idx - 1; i >= 0; i--) { const prev = parent.nodes[i]; if (prev.type === 'Comment') { ignores.push( ...extract_svelte_ignore( prev.start + 4 /* '<!--'.length */, prev.data, state.analysis.runes ) ); } else if (prev.type !== 'Text') { break; } } } else { const comments = /** @type {any} */ (node).leadingComments; if (comments) { for (const comment of comments) { ignores.push( ...extract_svelte_ignore( comment.start + 2 /* '//'.length */, comment.value, state.analysis.runes ) ); } } } if (ignores.length > 0) { push_ignore(ignores); } ignore_map.set(node, structuredClone(ignore_stack)); const scope = state.scopes.get(node); next(scope !== undefined && scope !== state.scope ? { ...state, scope } : state); if (ignores.length > 0) { pop_ignore(); } }, ArrowFunctionExpression, AssignmentExpression, Attribute, AwaitBlock, BindDirective, CallExpression, ClassBody, ClassDeclaration, ClassDirective, Component, ConstTag, DebugTag, EachBlock, ExportDefaultDeclaration, ExportNamedDeclaration, ExportSpecifier, ExpressionStatement, ExpressionTag, FunctionDeclaration, FunctionExpression, HtmlTag, Identifier, IfBlock, ImportDeclaration, KeyBlock, LabeledStatement, LetDirective, MemberExpression, NewExpression, OnDirective, RegularElement, RenderTag, SlotElement, SnippetBlock, SpreadAttribute, StyleDirective, SvelteBody, SvelteComponent, SvelteDocument, SvelteElement, SvelteFragment, SvelteHead, SvelteSelf, SvelteWindow, TaggedTemplateExpression, Text, TitleElement, UpdateExpression, UseDirective, VariableDeclarator }; /** * @param {AST.Script | null} script * @param {ScopeRoot} root * @param {boolean} allow_reactive_declarations * @param {Scope | null} parent * @returns {Js} */ function js(script, root, allow_reactive_declarations, parent) { /** @type {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); } const RESERVED = ['$$props', '$$restProps', '$$slots']; /** * @param {Program} ast * @param {ValidatedModuleCompileOptions} options * @returns {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] !== '$' || RESERVED.includes(name)) continue; if (name === '$' || name[1] === '$') { e.global_reference_invalid(references[0].node, name); } const binding = scope.get(name.slice(1)); if (binding !== null && !is_rune(name)) { e.store_invalid_subscription_module(references[0].node); } } walk( /** @type {Node} */ (ast), { scope, scopes, // @ts-expect-error TODO analysis: { runes: true } }, visitors ); return { module: { ast, scope, scopes }, name: options.filename, accessors: false, runes: true, immutable: true }; } /** * @param {AST.Root} root * @param {string} source * @param {ValidatedCompileOptions} options * @returns {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 {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] !== '$' || RESERVED.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 || !is_rune(name) || (declaration !== null && // const state = $state(0) is valid (get_rune(declaration.initial, instance.scope) === null || // rune-line names received as props are valid too (but we have to protect against $props as store) (store_name !== 'props' && get_rune(declaration.initial, instance.scope) === '$props')) && // 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 && is_rune(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 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 {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); const runes = options.runes ?? Array.from(module.scope.references.keys()).some(is_rune); if (runes && root.module) { const context = root.module.attributes.find((attribute) => attribute.name === 'context'); if (context) { w.script_context_deprecated(context); } } // TODO remove all the ?? stuff, we don't need it now that we're validating the config /** @type {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.compatibility?.componentApi === 4, 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, name: component_name, hash }) : '', keyframes: [] }, source }; if (!runes) { // every exported `let` or `var` declaration becomes a prop, everything else becomes an export for (const node of instance.ast.body) { if (node.type !== 'ExportNamedDeclaration') continue; analysis.needs_props = true; if (node.declaration) { if ( node.declaration.type === 'FunctionDeclaration' || node.declaration.type === 'ClassDeclaration' ) { analysis.exports.push({ name: /** @type {import('estree').Identifier} */ (node.declaration.id).name, alias: null }); } else 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)) { analysis.exports.push({ name: node.name, alias: null }); } } } else { for (const declarator of node.declaration.declarations) { for (const id of extract_identifiers(declarator.id)) { const binding = /** @type {Binding} */ (instance.scope.get(id.name)); binding.kind = 'bindable_prop'; } } } } } else { for (const specifier of node.specifiers) { const binding = instance.scope.get(specifier.local.name); if ( binding && (binding.declaration_kind === 'var' || binding.declaration_kind === 'let') ) { binding.kind = 'bindable_prop'; if (specifier.exported.name !== specifier.local.name) { binding.prop_alias = specifier.exported.name; } } else { analysis.exports.push({ name: specifier.local.name, alias: specifier.exported.name }); } } } } // if reassigned/mutated bindings are referenced in `$:` blocks // or the template, turn them into state for (const binding of instance.scope.declarations.values()) { if (binding.kind !== 'normal') continue; for (const { node, path } of binding.references) { if (node === binding.node) continue; if (binding.updated) { if ( path[path.length - 1].type === 'StyleDirective' || path.some((node) => node.type === 'Fragment') || (path[1].type === 'LabeledStatement' && path[1].label.name === '$') ) { binding.kind = 'state'; } } } } // more legacy nonsense: if an `each` binding is reassigned/mutated, // treat the expression as being mutated as well walk(/** @type {SvelteNode} */ (template.ast), null, { EachBlock(node) { const scope = /** @type {Scope} */ (template.scopes.get(node)); for (const binding of scope.declarations.values()) { if (binding.updated) { const state = { scope: /** @type {Scope} */ (scope.parent), scopes: template.scopes }; walk(node.expression, state, { // @ts-expect-error _: set_scope, Identifier(node, context) { const parent = /** @type {Expression} */ (context.path.at(-1)); if (is_reference(node, parent)) { const binding = context.state.scope.get(node.name); if (binding && binding.kind === 'normal') { binding.kind = 'state'; binding.mutated = binding.updated = true; } } } }); break; } } } }); } if (root.options) { for (const attribute of root.options.attributes) { if (attribute.name === 'accessors' && analysis.runes) { w.options_deprecated_accessors(attribute); } if (attribute.name === 'customElement' && !options.customElement) { w.options_missing_custom_element(attribute); } if (attribute.name === 'immutable' && analysis.runes) { 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('$$restProps'); if (rest_props_refs) { e.legacy_rest_props_invalid(rest_props_refs[0].node); } for (const { ast, scope, scopes } of [module, instance, template]) { /** @type {AnalysisState} */ const state = { scope, scopes, analysis, options, ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module', parent_element: null, has_props_rune: false, component_slots: new Set(), expression: null, render_tag: null, private_derived_state: [], function_depth: scope.function_depth, instance_scope: instance.scope, reactive_statement: null, reactive_statements: new Map() }; walk(/** @type {SvelteNode} */ (ast), state, visitors); } // warn on any nonstate declarations that are a) reassigned and b) referenced in the template for (const scope of [module.scope, instance.scope]) { outer: for (const [name, binding] of scope.declarations) { if (binding.kind === 'normal' && binding.reassigned) { inner: for (const { path } of binding.references) { if (path[0].type !== 'Fragment') continue; for (let i = 1; i < path.length; i += 1) { const type = path[i].type; if ( type === 'FunctionDeclaration' || type === 'FunctionExpression' || type === 'ArrowFunctionExpression' ) { continue inner; } // bind:this doesn't need to be a state reference if it will never change if ( type === 'BindDirective' && /** @type {AST.BindDirective} */ (path[i]).name === 'this' ) { for (let j = i - 1; j >= 0; j -= 1) { const type = path[j].type; if ( type === 'IfBlock' || type === 'EachBlock' || type === 'AwaitBlock' || type === 'KeyBlock' ) { w.non_reactive_update(binding.node, name); continue outer; } } continue inner; } } w.non_reactive_update(binding.node, name); continue outer; } } } } } else { instance.scope.declare(b.id('$$props'), 'rest_prop', 'synthetic'); instance.scope.declare(b.id('$$restProps'), 'rest_prop', 'synthetic'); for (const { ast, scope, scopes } of [module, instance, template]) { /** @type {AnalysisState} */ const state = { scope, scopes, analysis, options, parent_element: null, has_props_rune: false, ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module', instance_scope: instance.scope, reactive_statement: null, reactive_statements: analysis.reactive_statements, component_slots: new Set(), expression: null, render_tag: null, private_derived_state: [], function_depth: scope.function_depth }; walk(/** @type {SvelteNode} */ (ast), state, visitors); } for (const [name, binding] of instance.scope.declarations) { if ( (binding.kind === 'prop' || binding.kind === 'bindable_prop') && binding.node.name !== '$$props' ) { const references = binding.references.filter( (r) => r.node !== binding.node && r.path.at(-1)?.type !== 'ExportSpecifier' ); if (!references.length && !instance.scope.declarations.has(`$${name}`)) { w.export_let_unused(binding.node, name); } } } analysis.reactive_statements = order_reactive_statements(analysis.reactive_statements); } if (analysis.event_directive_node && analysis.uses_event_attributes) { e.mixed_event_handler_syntaxes( analysis.event_directive_node, analysis.event_directive_node.name ); } if ( analysis.uses_render_tags && (analysis.uses_slots || (!analysis.custom_element && analysis.slot_names.size > 0)) ) { const pos = analysis.slot_names.values().next().value ?? analysis.source.indexOf('$$slot'); e.slot_snippet_conflict(pos); } 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); } const { comment } = analysis.css.ast.content; const should_ignore_unused = comment && extract_svelte_ignore(comment.start, comment.data, analysis.runes).includes( 'css_unused_selector' ); if (!should_ignore_unused) { 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 {AST.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) { if (is_text_attribute(class_attribute)) { class_attribute.value[0].data += ` ${analysis.css.hash}`; } else { /** @type {AST.Text} */ const css_text = { type: 'Text', data: ` ${analysis.css.hash}`, raw: ` ${analysis.css.hash}`, start: -1, end: -1, parent: null }; if (Array.isArray(class_attribute.value)) { class_attribute.value.push(css_text); } else { class_attribute.value = [class_attribute.value, css_text]; } } } 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 } ]) ); if (is_custom_element_node(element) && element.attributes.length === 1) { mark_subtree_dynamic(element.metadata.path); } } } } } // TODO // analysis.stylesheet.warn_on_unused_selectors(analysis); return analysis; } /** * @param {Map<import('estree').LabeledStatement, ReactiveStatement>} unsorted_reactive_declarations */ function order_reactive_statements(unsorted_reactive_declarations) { /** @typedef {[import('estree').LabeledStatement, 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, ReactiveStatement>} */ const reactive_declarations = new Map(); /** * * @param {import('estree').LabeledStatement} node * @param {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; } |