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chore: set `binding.kind` before analysis (#12843)

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* analyse exports before walking

* more

* another

* this is unused

* move stuff/tidy up

* this appears to be unnecessary

* this is all unnecessary

* simplify

* simplify

* simplify

* simplify

* move more stuff over

* changeset

* unused

* separate reassignment from mutation

* regenerate

* lint
pull/12850/head
Rich Harris 1 month ago committed by GitHub
parent 32808ac054
commit 19beb7754e
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
15 changed files with 143 additions and 152 deletions
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5
.changeset/pink-countries-repair.md
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@ -0,0 +1,5 @@
---
'svelte': patch
---
chore: set `binding.kind` before analysis

7
packages/svelte/src/compiler/migrate/index.js
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@ -331,10 +331,7 @@ const instance_script = {
const binding = /** @type {Compiler.Binding} */ (state.scope.get(declarator.id.name));
if (
state.analysis.uses_props &&
(declarator.init || binding.mutated || binding.reassigned)
) {
if (state.analysis.uses_props && (declarator.init || binding.updated)) {
throw new Error(
'$$props is used together with named props in a way that cannot be automatically migrated.'
);
@ -350,7 +347,7 @@ const instance_script = {
)
: '',
optional: !!declarator.init,
bindable: binding.mutated || binding.reassigned,
bindable: binding.updated,
...extract_type_and_comment(declarator, state.str, path)
});
state.props_insertion_point = /** @type {number} */ (declarator.end);

115
packages/svelte/src/compiler/phases/2-analyze/index.js
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@ -1,13 +1,13 @@
/** @import { Node, Program } from 'estree' */
/** @import { Root, Script, SvelteNode, ValidatedCompileOptions, ValidatedModuleCompileOptions } from '#compiler' */
/** @import { Expression, Node, Program } from 'estree' */
/** @import { Binding, Root, Script, 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 { is_text_attribute } from '../../utils/ast.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 } from '../scope.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 } from '../nodes.js';
import { analyze_css } from './css/css-analyze.js';
@ -62,6 +62,7 @@ import { Text } from './visitors/Text.js';
import { TitleElement } from './visitors/TitleElement.js';
import { UpdateExpression } from './visitors/UpdateExpression.js';
import { VariableDeclarator } from './visitors/VariableDeclarator.js';
import is_reference from 'is-reference';
/**
* @type {Visitors}
@ -397,6 +398,112 @@ export function analyze_component(root, source, options) {
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') {

4
packages/svelte/src/compiler/phases/2-analyze/visitors/Attribute.js
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@ -134,7 +134,7 @@ function get_delegated_event(event_name, handler, context) {
return unhoisted;
}
if (binding !== null && binding.initial !== null && !binding.mutated && !binding.is_called) {
if (binding !== null && binding.initial !== null && !binding.updated && !binding.is_called) {
const binding_type = binding.initial.type;
if (
@ -188,7 +188,7 @@ function get_delegated_event(event_name, handler, context) {
(((!context.state.analysis.runes && binding.kind === 'each') ||
// or any normal not reactive bindings that are mutated.
binding.kind === 'normal') &&
binding.mutated))
binding.updated))
) {
return unhoisted;
}

6
packages/svelte/src/compiler/phases/2-analyze/visitors/BindDirective.js
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@ -39,7 +39,7 @@ export function BindDirective(node, context) {
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'store_sub' &&
!binding.mutated))
!binding.updated)) // TODO wut?
) {
e.bind_invalid_value(node.expression);
}
@ -80,10 +80,6 @@ export function BindDirective(node, context) {
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]);

31
packages/svelte/src/compiler/phases/2-analyze/visitors/ExportNamedDeclaration.js
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@ -39,37 +39,6 @@ export function ExportNamedDeclaration(node, context) {
}
}
if (context.state.ast_type === 'instance' && !context.state.analysis.runes) {
context.state.analysis.needs_props = true;
if (node.declaration) {
if (
node.declaration.type === 'FunctionDeclaration' ||
node.declaration.type === 'ClassDeclaration'
) {
context.state.analysis.exports.push({
name: /** @type {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)) {
context.state.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} */ (context.state.scope.get(id.name));
binding.kind = 'bindable_prop';
}
}
}
}
}
}
if (context.state.analysis.runes) {
if (node.declaration && context.state.ast_type === 'instance') {
if (

24
packages/svelte/src/compiler/phases/2-analyze/visitors/ExportSpecifier.js
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@ -17,29 +17,7 @@ export function ExportSpecifier(node, context) {
});
const binding = context.state.scope.get(node.local.name);
if (binding) binding.reassigned = true;
} else {
context.state.analysis.needs_props = true;
const binding = /** @type {Binding} */ (context.state.scope.get(node.local.name));
if (
binding !== null &&
(binding.kind === 'state' ||
binding.kind === 'raw_state' ||
(binding.kind === 'normal' &&
(binding.declaration_kind === 'let' || binding.declaration_kind === 'var')))
) {
binding.kind = 'bindable_prop';
if (node.exported.name !== node.local.name) {
binding.prop_alias = node.exported.name;
}
} else {
context.state.analysis.exports.push({
name: node.local.name,
alias: node.exported.name
});
}
if (binding) binding.reassigned = binding.updated = true;
}
} else {
validate_export(node, context.state.scope, node.local.name);

41
packages/svelte/src/compiler/phases/2-analyze/visitors/Identifier.js
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@ -1,4 +1,5 @@
/** @import { Expression, Identifier } from 'estree' */
/** @import { EachBlock } from '#compiler' */
/** @import { Context } from '../types' */
import is_reference from 'is-reference';
import { should_proxy } from '../../3-transform/client/utils.js';
@ -77,46 +78,6 @@ export function Identifier(node, context) {
if (node.name === '$$restProps') {
context.state.analysis.uses_rest_props = true;
}
if (
binding?.kind === 'normal' &&
((binding.scope === context.state.instance_scope &&
binding.declaration_kind !== 'function') ||
binding.declaration_kind === 'import')
) {
if (
binding.declaration_kind !== 'import' &&
binding.mutated &&
// TODO could be more fine-grained - not every mention in the template implies a state binding
(context.state.reactive_statement || context.state.ast_type === 'template')
) {
binding.kind = 'state';
} else if (
context.state.reactive_statement &&
parent.type === 'AssignmentExpression' &&
parent.left === binding.node
) {
binding.kind = 'derived';
}
} else if (binding?.kind === 'each' && binding.mutated) {
// Ensure that the array is marked as reactive even when only its entries are mutated
let i = context.path.length;
while (i--) {
const ancestor = context.path[i];
if (
ancestor.type === 'EachBlock' &&
context.state.analysis.template.scopes.get(ancestor)?.declarations.get(node.name) ===
binding
) {
for (const binding of ancestor.metadata.references) {
if (binding.kind === 'normal') {
binding.kind = 'state';
}
}
break;
}
}
}
}
if (binding) {

4
packages/svelte/src/compiler/phases/2-analyze/visitors/StyleDirective.js
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@ -17,10 +17,6 @@ export function StyleDirective(node, context) {
let binding = context.state.scope.get(node.name);
if (binding) {
if (!context.state.analysis.runes && binding.mutated) {
binding.kind = 'state';
}
if (binding.kind !== 'normal') {
node.metadata.expression.has_state = true;
}

2
packages/svelte/src/compiler/phases/3-transform/client/utils.js
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@ -235,7 +235,7 @@ export function is_prop_source(binding, state) {
binding.initial ||
// Until legacy mode is gone, we also need to use the prop source when only mutated is true,
// because the parent could be a legacy component which needs coarse-grained reactivity
binding.mutated)
binding.updated)
);
}

6
packages/svelte/src/compiler/phases/3-transform/client/visitors/EachBlock.js
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@ -114,7 +114,7 @@ export function EachBlock(node, context) {
const indirect_dependencies = collect_parent_each_blocks(context).flatMap((block) => {
const array = /** @type {Expression} */ (context.visit(block.expression));
const transitive_dependencies = build_transitive_dependencies(
block.metadata.references,
block.metadata.expression.dependencies,
context
);
return [array, ...transitive_dependencies];
@ -126,7 +126,7 @@ export function EachBlock(node, context) {
indirect_dependencies.push(collection);
const transitive_dependencies = build_transitive_dependencies(
each_node_meta.references,
each_node_meta.expression.dependencies,
context
);
indirect_dependencies.push(...transitive_dependencies);
@ -279,7 +279,7 @@ function collect_parent_each_blocks(context) {
}
/**
* @param {Binding[]} references
* @param {Set<Binding>} references
* @param {ComponentContext} context
*/
function build_transitive_dependencies(references, context) {

42
packages/svelte/src/compiler/phases/scope.js
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@ -113,13 +113,14 @@ export class Scope {
references: [],
legacy_dependencies: [],
initial,
reassigned: false,
mutated: false,
updated: false,
scope: this,
kind,
declaration_kind,
is_called: false,
prop_alias: null,
reassigned: false,
metadata: null
};
this.declarations.set(node.name, binding);
@ -506,17 +507,7 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
},
EachBlock(node, { state, visit }) {
// Array part is still from the scope above
/** @type {Set<Identifier>} */
const references_within = new Set();
const idx = references.length;
visit(node.expression);
for (let i = idx; i < references.length; i++) {
const [scope, { node: id }] = references[i];
if (scope === state.scope) {
references_within.add(id);
}
}
// context and children are a new scope
const scope = state.scope.child();
@ -582,9 +573,6 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
index: scope.root.unique('$$index'),
item: node.context.type === 'Identifier' ? node.context : b.id('$$item'),
declarations: scope.declarations,
references: [...references_within]
.map((id) => /** @type {Binding} */ (state.scope.get(id.name)))
.filter(Boolean),
is_controlled: false
};
},
@ -671,7 +659,7 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
// the css property
StyleDirective(node, { path, state, next }) {
if (node.value === true) {
state.scope.reference(b.id(node.name), path);
state.scope.reference(b.id(node.name), path.concat(node));
}
next();
}
@ -693,25 +681,19 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
}
for (const [scope, node] of updates) {
if (node.type === 'MemberExpression') {
let object = node.object;
while (object.type === 'MemberExpression') {
object = object.object;
}
for (const expression of unwrap_pattern(node)) {
const left = object(expression);
const binding = left && scope.get(left.name);
const binding = scope.get(/** @type {Identifier} */ (object).name);
if (binding) binding.mutated = true;
} else {
unwrap_pattern(node).forEach((node) => {
let id = node.type === 'Identifier' ? node : object(node);
if (id === null) return;
if (binding !== null && left !== binding.node) {
binding.updated = true;
const binding = scope.get(id.name);
if (binding && id !== binding.node) {
if (left === expression) {
binding.reassigned = true;
} else {
binding.mutated = true;
binding.reassigned = node.type === 'Identifier';
}
});
}
}
}

2
packages/svelte/src/compiler/types/index.d.ts vendored
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@ -300,6 +300,8 @@ export interface Binding {
references: { node: Identifier; path: SvelteNode[] }[];
mutated: boolean;
reassigned: boolean;
/** `true` if mutated _or_ reassigned */
updated: boolean;
scope: Scope;
/** For `legacy_reactive`: its reactive dependencies */
legacy_dependencies: Binding[];

2
packages/svelte/src/compiler/types/template.d.ts vendored
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@ -404,8 +404,6 @@ export interface EachBlock extends BaseNode {
index: Identifier;
item: Identifier;
declarations: Map<string, Binding>;
/** List of bindings that are referenced within the expression */
references: Binding[];
/**
* Optimization path for each blocks: If the parent isn't a fragment and
* it only has a single child, then we can classify the block as being "controlled".

4
packages/svelte/types/index.d.ts vendored
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@ -949,6 +949,8 @@ declare module 'svelte/compiler' {
references: { node: Identifier; path: SvelteNode[] }[];
mutated: boolean;
reassigned: boolean;
/** `true` if mutated _or_ reassigned */
updated: boolean;
scope: Scope;
/** For `legacy_reactive`: its reactive dependencies */
legacy_dependencies: Binding[];
@ -1859,8 +1861,6 @@ declare module 'svelte/compiler' {
index: Identifier;
item: Identifier;
declarations: Map<string, Binding>;
/** List of bindings that are referenced within the expression */
references: Binding[];
/**
* Optimization path for each blocks: If the parent isn't a fragment and
* it only has a single child, then we can classify the block as being "controlled".

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