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/** @import { ValidatedCompileOptions, AST, ValidatedModuleCompileOptions, SvelteNode } from '#compiler' */
/** @import { ComponentAnalysis, Analysis } from '../../types' */
/** @import { Visitors, ComponentClientTransformState, ClientTransformState } from './types' */
import { walk } from 'zimmerframe';
import * as b from '../../../utils/builders.js';
import { build_getter, is_state_source } from './utils.js';
import { render_stylesheet } from '../css/index.js';
import { dev, filename } from '../../../state.js';
import { AnimateDirective } from './visitors/AnimateDirective.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 { BinaryExpression } from './visitors/BinaryExpression.js';
import { BindDirective } from './visitors/BindDirective.js';
import { BlockStatement } from './visitors/BlockStatement.js';
import { BreakStatement } from './visitors/BreakStatement.js';
import { CallExpression } from './visitors/CallExpression.js';
import { ClassBody } from './visitors/ClassBody.js';
import { Comment } from './visitors/Comment.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 { ExportNamedDeclaration } from './visitors/ExportNamedDeclaration.js';
import { ExpressionStatement } from './visitors/ExpressionStatement.js';
import { Fragment } from './visitors/Fragment.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 { OnDirective } from './visitors/OnDirective.js';
import { Program } from './visitors/Program.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 { 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 { TitleElement } from './visitors/TitleElement.js';
import { TransitionDirective } from './visitors/TransitionDirective.js';
import { UpdateExpression } from './visitors/UpdateExpression.js';
import { UseDirective } from './visitors/UseDirective.js';
import { VariableDeclaration } from './visitors/VariableDeclaration.js';
/** @type {Visitors} */
const visitors = {
_: function set_scope(node, { next, state }) {
const scope = state.scopes.get(node);
if (scope && scope !== state.scope) {
const transform = { ...state.transform };
for (const [name, binding] of scope.declarations) {
if (
binding.kind === 'normal' ||
// Reads of `$state(...)` declarations are not
// transformed if they are never reassigned
(binding.kind === 'state' && !is_state_source(binding, state.analysis))
) {
delete transform[name];
}
}
next({ ...state, transform, scope });
} else {
next();
}
},
AnimateDirective,
ArrowFunctionExpression,
AssignmentExpression,
Attribute,
AwaitBlock,
BinaryExpression,
BindDirective,
BlockStatement,
BreakStatement,
CallExpression,
ClassBody,
Comment,
Component,
ConstTag,
DebugTag,
EachBlock,
ExportNamedDeclaration,
ExpressionStatement,
Fragment,
FunctionDeclaration,
FunctionExpression,
HtmlTag,
Identifier,
IfBlock,
ImportDeclaration,
KeyBlock,
LabeledStatement,
LetDirective,
MemberExpression,
OnDirective,
Program,
RegularElement,
RenderTag,
SlotElement,
SnippetBlock,
SpreadAttribute,
SvelteBody,
SvelteComponent,
SvelteDocument,
SvelteElement,
SvelteFragment,
SvelteHead,
SvelteSelf,
SvelteWindow,
TitleElement,
TransitionDirective,
UpdateExpression,
UseDirective,
VariableDeclaration
};
/**
* @param {ComponentAnalysis} analysis
* @param {ValidatedCompileOptions} options
* @returns {ESTree.Program}
*/
export function client_component(analysis, options) {
/** @type {ComponentClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
is_instance: false,
hoisted: [b.import_all('$', 'svelte/internal/client')],
node: /** @type {any} */ (null), // populated by the root node
legacy_reactive_imports: [],
legacy_reactive_statements: new Map(),
metadata: {
context: {
template_needs_import_node: false,
template_contains_script_tag: false
},
namespace: options.namespace,
bound_contenteditable: false
},
events: new Set(),
preserve_whitespace: options.preserveWhitespace,
public_state: new Map(),
private_state: new Map(),
transform: {},
in_constructor: false,
// these are set inside the `Fragment` visitor, and cannot be used until then
before_init: /** @type {any} */ (null),
init: /** @type {any} */ (null),
update: /** @type {any} */ (null),
after_update: /** @type {any} */ (null),
template: /** @type {any} */ (null),
locations: /** @type {any} */ (null)
};
const module = /** @type {ESTree.Program} */ (
walk(/** @type {SvelteNode} */ (analysis.module.ast), state, visitors)
);
const instance_state = {
...state,
transform: { ...state.transform },
scope: analysis.instance.scope,
scopes: analysis.instance.scopes,
is_instance: true
};
const instance = /** @type {ESTree.Program} */ (
walk(/** @type {SvelteNode} */ (analysis.instance.ast), instance_state, visitors)
);
const template = /** @type {ESTree.Program} */ (
walk(
/** @type {SvelteNode} */ (analysis.template.ast),
{
...state,
transform: instance_state.transform,
scope: analysis.instance.scope,
scopes: analysis.template.scopes
},
visitors
)
);
module.body.unshift(...state.legacy_reactive_imports);
/** @type {ESTree.Statement[]} */
const store_setup = [];
/** @type {ESTree.VariableDeclaration[]} */
const legacy_reactive_declarations = [];
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'legacy_reactive') {
legacy_reactive_declarations.push(
b.const(name, b.call('$.mutable_state', undefined, analysis.immutable ? b.true : undefined))
);
}
if (binding.kind === 'store_sub') {
if (store_setup.length === 0) {
store_setup.push(b.const('$$stores', b.call('$.setup_stores')));
}
// We're creating an arrow function that gets the store value which minifies better for two or more references
const store_reference = build_getter(b.id(name.slice(1)), instance_state);
const store_get = b.call('$.store_get', store_reference, b.literal(name), b.id('$$stores'));
store_setup.push(
b.const(
binding.node,
dev
? b.thunk(
b.sequence([
b.call('$.validate_store', store_reference, b.literal(name.slice(1))),
store_get
])
)
: b.thunk(store_get)
)
);
}
}
for (const [node] of analysis.reactive_statements) {
const statement = [...state.legacy_reactive_statements].find(([n]) => n === node);
if (statement === undefined) {
throw new Error('Could not find reactive statement');
}
instance.body.push(statement[1]);
}
if (analysis.reactive_statements.size > 0) {
instance.body.push(b.stmt(b.call('$.legacy_pre_effect_reset')));
}
/**
* Used to store the group nodes
* @type {ESTree.VariableDeclaration[]}
*/
const group_binding_declarations = [];
for (const group of analysis.binding_groups.values()) {
group_binding_declarations.push(b.const(group.name, b.array([])));
}
/** @type {Array<ESTree.Property | ESTree.SpreadElement>} */
const component_returned_object = analysis.exports.flatMap(({ name, alias }) => {
const binding = instance_state.scope.get(name);
const expression = build_getter(b.id(name), instance_state);
const getter = b.get(alias ?? name, [b.return(expression)]);
if (expression.type === 'Identifier') {
if (binding?.declaration_kind === 'let' || binding?.declaration_kind === 'var') {
return [
getter,
b.set(alias ?? name, [b.stmt(b.assignment('=', expression, b.id('$$value')))])
];
} else if (!dev) {
return b.init(alias ?? name, expression);
}
}
if (binding?.kind === 'prop' || binding?.kind === 'bindable_prop') {
return [getter, b.set(alias ?? name, [b.stmt(b.call(name, b.id('$$value')))])];
}
if (binding?.kind === 'state' || binding?.kind === 'raw_state') {
const value = binding.kind === 'state' ? b.call('$.proxy', b.id('$$value')) : b.id('$$value');
return [getter, b.set(alias ?? name, [b.stmt(b.call('$.set', b.id(name), value))])];
}
return getter;
});
const properties = [...analysis.instance.scope.declarations].filter(
([name, binding]) =>
(binding.kind === 'prop' || binding.kind === 'bindable_prop') && !name.startsWith('$$')
);
if (dev && analysis.runes) {
const exports = analysis.exports.map(({ name, alias }) => b.literal(alias ?? name));
/** @type {ESTree.Literal[]} */
const bindable = [];
for (const [name, binding] of properties) {
if (binding.kind === 'bindable_prop') {
bindable.push(b.literal(binding.prop_alias ?? name));
}
}
instance.body.unshift(
b.stmt(
b.call(
'$.validate_prop_bindings',
b.id('$$props'),
b.array(bindable),
b.array(exports),
b.id(`${analysis.name}`)
)
)
);
}
if (analysis.accessors) {
for (const [name, binding] of properties) {
const key = binding.prop_alias ?? name;
const getter = b.get(key, [b.return(b.call(b.id(name)))]);
const setter = b.set(key, [
b.stmt(b.call(b.id(name), b.id('$$value'))),
b.stmt(b.call('$.flush_sync'))
]);
if (analysis.runes && binding.initial) {
// turn `set foo($$value)` into `set foo($$value = expression)`
setter.value.params[0] = {
type: 'AssignmentPattern',
left: b.id('$$value'),
right: /** @type {ESTree.Expression} */ (binding.initial)
};
}
component_returned_object.push(getter, setter);
}
}
if (options.compatibility.componentApi === 4) {
component_returned_object.push(
b.init('$set', b.id('$.update_legacy_props')),
b.init(
'$on',
b.arrow(
[b.id('$$event_name'), b.id('$$event_cb')],
b.call(
'$.add_legacy_event_listener',
b.id('$$props'),
b.id('$$event_name'),
b.id('$$event_cb')
)
)
)
);
} else if (dev) {
component_returned_object.push(b.spread(b.call(b.id('$.legacy_api'))));
}
const push_args = [b.id('$$props'), b.literal(analysis.runes)];
if (dev) push_args.push(b.id(analysis.name));
const component_block = b.block([
...store_setup,
...legacy_reactive_declarations,
...group_binding_declarations,
...analysis.top_level_snippets,
.../** @type {ESTree.Statement[]} */ (instance.body),
analysis.runes || !analysis.needs_context
? b.empty
: b.stmt(b.call('$.init', analysis.immutable ? b.true : undefined)),
.../** @type {ESTree.Statement[]} */ (template.body)
]);
if (!analysis.runes) {
// Bind static exports to props so that people can access them with bind:x
for (const { name, alias } of analysis.exports) {
component_block.body.push(
b.stmt(
b.call(
'$.bind_prop',
b.id('$$props'),
b.literal(alias ?? name),
build_getter(b.id(name), instance_state)
)
)
);
}
}
if (analysis.css.ast !== null && analysis.inject_styles) {
const hash = b.literal(analysis.css.hash);
const code = b.literal(render_stylesheet(analysis.source, analysis, options).code);
state.hoisted.push(b.const('$$css', b.object([b.init('hash', hash), b.init('code', code)])));
component_block.body.unshift(
b.stmt(b.call('$.append_styles', b.id('$$anchor'), b.id('$$css')))
);
}
const should_inject_context =
dev ||
analysis.needs_context ||
analysis.reactive_statements.size > 0 ||
component_returned_object.length > 0;
if (should_inject_context) {
component_block.body.unshift(b.stmt(b.call('$.push', ...push_args)));
component_block.body.push(
component_returned_object.length > 0
? b.return(b.call('$.pop', b.object(component_returned_object)))
: b.stmt(b.call('$.pop'))
);
}
if (analysis.uses_rest_props) {
const named_props = analysis.exports.map(({ name, alias }) => alias ?? name);
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop') named_props.push(binding.prop_alias ?? name);
}
component_block.body.unshift(
b.const(
'$$restProps',
b.call(
'$.legacy_rest_props',
b.id('$$sanitized_props'),
b.array(named_props.map((name) => b.literal(name)))
)
)
);
}
if (analysis.uses_props || analysis.uses_rest_props) {
const to_remove = [
b.literal('children'),
b.literal('$$slots'),
b.literal('$$events'),
b.literal('$$legacy')
];
if (analysis.custom_element) {
to_remove.push(b.literal('$$host'));
}
component_block.body.unshift(
b.const(
'$$sanitized_props',
b.call('$.legacy_rest_props', b.id('$$props'), b.array(to_remove))
)
);
}
if (analysis.uses_slots) {
component_block.body.unshift(b.const('$$slots', b.call('$.sanitize_slots', b.id('$$props'))));
}
let should_inject_props =
should_inject_context ||
analysis.needs_props ||
analysis.uses_props ||
analysis.uses_rest_props ||
analysis.uses_slots ||
analysis.slot_names.size > 0;
// Merge hoisted statements into module body.
// Ensure imports are on top, with the order preserved, then module body, then hoisted statements
/** @type {ESTree.ImportDeclaration[]} */
const imports = [];
/** @type {ESTree.Program['body']} */
let body = [];
for (const entry of [...module.body, ...state.hoisted]) {
if (entry.type === 'ImportDeclaration') {
imports.push(entry);
} else {
body.push(entry);
}
}
body = [...imports, ...body];
const component = b.function_declaration(
b.id(analysis.name),
should_inject_props ? [b.id('$$anchor'), b.id('$$props')] : [b.id('$$anchor')],
component_block
);
if (options.hmr) {
const id = b.id(analysis.name);
const HMR = b.id('$.HMR');
const existing = b.member(id, HMR, true);
const incoming = b.member(b.id('module.default'), HMR, true);
const accept_fn_body = [
b.stmt(b.assignment('=', b.member(incoming, 'source'), b.member(existing, 'source'))),
b.stmt(b.call('$.set', b.member(existing, 'source'), b.member(incoming, 'original')))
];
if (analysis.css.hash) {
// remove existing `<style>` element, in case CSS changed
accept_fn_body.unshift(b.stmt(b.call('$.cleanup_styles', b.literal(analysis.css.hash))));
}
const hmr = b.block([
b.stmt(b.assignment('=', id, b.call('$.hmr', id, b.thunk(b.member(existing, 'source'))))),
b.stmt(b.call('import.meta.hot.accept', b.arrow([b.id('module')], b.block(accept_fn_body))))
]);
body.push(component, b.if(b.id('import.meta.hot'), hmr), b.export_default(b.id(analysis.name)));
} else {
body.push(b.export_default(component));
}
if (dev) {
// add `App[$.FILENAME] = 'App.svelte'` so that we can print useful messages later
body.unshift(
b.stmt(
b.assignment('=', b.member(b.id(analysis.name), '$.FILENAME', true), b.literal(filename))
)
);
body.unshift(b.stmt(b.call(b.id('$.mark_module_start'))));
body.push(b.stmt(b.call(b.id('$.mark_module_end'), b.id(analysis.name))));
}
if (options.discloseVersion) {
body.unshift(b.imports([], 'svelte/internal/disclose-version'));
}
if (options.compatibility.componentApi === 4) {
body.unshift(b.imports([['createClassComponent', '$$_createClassComponent']], 'svelte/legacy'));
component_block.body.unshift(
b.if(
b.id('new.target'),
b.return(
b.call(
'$$_createClassComponent',
// When called with new, the first argument is the constructor options
b.object([b.init('component', b.id(analysis.name)), b.spread(b.id('$$anchor'))])
)
)
)
);
} else if (dev) {
component_block.body.unshift(b.stmt(b.call('$.check_target', b.id('new.target'))));
}
if (state.events.size > 0) {
body.push(
b.stmt(b.call('$.delegate', b.array(Array.from(state.events).map((name) => b.literal(name)))))
);
}
if (analysis.custom_element) {
const ce = analysis.custom_element;
/** @type {ESTree.Property[]} */
const props_str = [];
for (const [name, binding] of properties) {
const key = binding.prop_alias ?? name;
const prop_def = typeof ce === 'boolean' ? {} : ce.props?.[key] || {};
if (
!prop_def.type &&
binding.initial?.type === 'Literal' &&
typeof binding.initial.value === 'boolean'
) {
prop_def.type = 'Boolean';
}
const value = b.object(
/** @type {ESTree.Property[]} */ (
[
prop_def.attribute ? b.init('attribute', b.literal(prop_def.attribute)) : undefined,
prop_def.reflect ? b.init('reflect', b.literal(true)) : undefined,
prop_def.type ? b.init('type', b.literal(prop_def.type)) : undefined
].filter(Boolean)
)
);
props_str.push(b.init(key, value));
}
const slots_str = b.array([...analysis.slot_names.keys()].map((name) => b.literal(name)));
const accessors_str = b.array(
analysis.exports.map(({ name, alias }) => b.literal(alias ?? name))
);
const use_shadow_dom = typeof ce === 'boolean' || ce.shadow !== 'none' ? true : false;
const create_ce = b.call(
'$.create_custom_element',
b.id(analysis.name),
b.object(props_str),
slots_str,
accessors_str,
b.literal(use_shadow_dom),
/** @type {any} */ (typeof ce !== 'boolean' ? ce.extend : undefined)
);
// If a tag name is provided, call `customElements.define`, otherwise leave to the user
if (typeof ce !== 'boolean' && typeof ce.tag === 'string') {
const define = b.stmt(b.call('customElements.define', b.literal(ce.tag), create_ce));
if (options.hmr) {
body.push(
b.if(b.binary('==', b.call('customElements.get', b.literal(ce.tag)), b.null), define)
);
} else {
body.push(define);
}
} else {
body.push(b.stmt(create_ce));
}
}
return {
type: 'Program',
sourceType: 'module',
body
};
}
/**
* @param {Analysis} analysis
* @param {ValidatedModuleCompileOptions} options
* @returns {ESTree.Program}
*/
export function client_module(analysis, options) {
/** @type {ClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
public_state: new Map(),
private_state: new Map(),
transform: {},
in_constructor: false
};
const module = /** @type {ESTree.Program} */ (
walk(/** @type {SvelteNode} */ (analysis.module.ast), state, visitors)
);
return {
type: 'Program',
sourceType: 'module',
body: [b.import_all('$', 'svelte/internal/client'), ...module.body]
};
}
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