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import * as b from '../../../utils/builders.js';
import { set_scope } from '../../scope.js';
import { template_visitors } from './visitors/template.js';
import { global_visitors } from './visitors/global.js';
import { javascript_visitors } from './visitors/javascript.js';
import { javascript_visitors_runes } from './visitors/javascript-runes.js';
import { javascript_visitors_legacy } from './visitors/javascript-legacy.js';
import { serialize_get_binding } from './utils.js';
import { render_stylesheet } from '../css/index.js';
import { getLocator } from 'locate-character';
/**
* This function ensures visitor sets don't accidentally clobber each other
* @param {...import('./types').Visitors} array
* @returns {import('./types').Visitors}
*/
function combine_visitors(...array) {
/** @type {Record<string, any>} */
const visitors = {};
for (const member of array) {
for (const key in member) {
if (visitors[key]) {
throw new Error(`Duplicate visitor: ${key}`);
}
// @ts-ignore
visitors[key] = member[key];
}
}
return visitors;
}
/**
* @param {string} source
* @param {import('../../types').ComponentAnalysis} analysis
* @param {import('#compiler').ValidatedCompileOptions} options
* @returns {import('estree').Program}
*/
export function client_component(source, analysis, options) {
/** @type {import('./types').ComponentClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.template.scopes,
hoisted: [b.import_all('$', 'svelte/internal/client')],
node: /** @type {any} */ (null), // populated by the root node
source_locator: getLocator(source, { offsetLine: 1 }),
// these should be set by create_block - if they're called outside, it's a bug
get before_init() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('before_init.push should not be called outside create_block');
};
return a;
},
get init() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('init.push should not be called outside create_block');
};
return a;
},
get update() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('update.push should not be called outside create_block');
};
return a;
},
get after_update() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('after_update.push should not be called outside create_block');
};
return a;
},
get template() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('template.push should not be called outside create_block');
};
return a;
},
get locations() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('locations.push should not be called outside create_block');
};
return a;
},
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(),
in_constructor: false
};
const module = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.module.ast),
state,
combine_visitors(
set_scope(analysis.module.scopes),
global_visitors,
// @ts-expect-error TODO
javascript_visitors,
analysis.runes ? javascript_visitors_runes : javascript_visitors_legacy
)
)
);
const instance_state = { ...state, scope: analysis.instance.scope };
const instance = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.instance.ast),
instance_state,
combine_visitors(
set_scope(analysis.instance.scopes),
global_visitors,
// @ts-expect-error TODO
javascript_visitors,
analysis.runes ? javascript_visitors_runes : javascript_visitors_legacy,
{
ImportDeclaration(node) {
state.hoisted.push(node);
return b.empty;
},
ExportNamedDeclaration(node, context) {
if (node.declaration) {
return context.visit(node.declaration);
}
return b.empty;
}
}
)
)
);
const template = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.template.ast),
{ ...state, scope: analysis.instance.scope },
combine_visitors(
set_scope(analysis.template.scopes),
global_visitors,
// @ts-expect-error TODO
template_visitors
)
)
);
// Very very dirty way of making import statements reactive in legacy mode if needed
if (!analysis.runes) {
for (const [name, binding] of analysis.module.scope.declarations) {
if (binding.kind === 'legacy_reactive_import') {
instance.body.unshift(
b.var('$$_import_' + name, b.call('$.reactive_import', b.thunk(b.id(name))))
);
}
}
}
/** @type {import('estree').Statement[]} */
const store_setup = [];
/** @type {import('estree').VariableDeclaration[]} */
const legacy_reactive_declarations = [];
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'legacy_reactive') {
legacy_reactive_declarations.push(b.const(name, b.call('$.mutable_source')));
}
if (binding.kind === 'store_sub') {
if (store_setup.length === 0) {
store_setup.push(
b.const('$$subscriptions', b.object([])),
b.stmt(b.call('$.unsubscribe_on_destroy', b.id('$$subscriptions')))
);
}
// We're creating an arrow function that gets the store value which minifies better for two or more references
const store_reference = serialize_get_binding(b.id(name.slice(1)), instance_state);
const store_get = b.call(
'$.store_get',
store_reference,
b.literal(name),
b.id('$$subscriptions')
);
store_setup.push(
b.const(
binding.node,
options.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 {import('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<import('estree').Property | import('estree').SpreadElement>} */
const component_returned_object = analysis.exports.map(({ name, alias }) => {
const expression = serialize_get_binding(b.id(name), instance_state);
if (expression.type === 'Identifier' && !options.dev) {
return b.init(alias ?? name, expression);
}
return b.get(alias ?? name, [b.return(expression)]);
});
const properties = [...analysis.instance.scope.declarations].filter(
([name, binding]) =>
(binding.kind === 'prop' || binding.kind === 'bindable_prop') && !name.startsWith('$$')
);
if (analysis.runes && options.dev) {
const exports = analysis.exports.map(({ name, alias }) => b.literal(alias ?? name));
/** @type {import('estree').Literal[]} */
const bindable = [];
for (const [name, binding] of properties) {
if (binding.kind === 'bindable_prop') {
bindable.push(b.literal(binding.prop_alias ?? name));
}
}
instance.body.unshift(
b.stmt(
b.call(
'$.validate_prop_bindings',
b.id('$$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 {import('estree').Expression} */ (binding.initial)
};
}
component_returned_object.push(getter, setter);
}
}
if (options.legacy.componentApi) {
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('$$event_cb')
)
)
)
);
} else if (options.dev) {
component_returned_object.push(b.spread(b.call(b.id('$.legacy_api'))));
}
const push_args = [b.id('$$props'), b.literal(analysis.runes)];
if (options.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 {import('estree').Statement[]} */ (instance.body),
analysis.runes || !analysis.needs_context ? b.empty : b.stmt(b.call('$.init')),
.../** @type {import('estree').Statement[]} */ (template.body)
]);
if (!analysis.runes) {
// Bind static exports to props so that people can access them with bind:x
for (const { name, alias } of analysis.exports) {
component_block.body.push(
b.stmt(
b.call(
'$.bind_prop',
b.id('$$props'),
b.literal(alias ?? name),
serialize_get_binding(b.id(name), instance_state)
)
)
);
}
}
const append_styles =
analysis.inject_styles && analysis.css.ast
? () =>
component_block.body.push(
b.stmt(
b.call(
'$.append_styles',
b.id('$$anchor'),
b.literal(analysis.css.hash),
b.literal(render_stylesheet(source, analysis, options).code)
)
)
)
: () => {};
append_styles();
const should_inject_context =
analysis.needs_context ||
analysis.reactive_statements.size > 0 ||
component_returned_object.length > 0 ||
options.dev;
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')];
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('$$props'))));
}
let should_inject_props =
should_inject_context ||
analysis.needs_props ||
analysis.uses_props ||
analysis.uses_rest_props ||
analysis.uses_slots ||
analysis.slot_names.size > 0;
const body = [...state.hoisted, ...module.body];
const component = b.function_declaration(
b.id(analysis.name),
should_inject_props ? [b.id('$$anchor'), b.id('$$props')] : [b.id('$$anchor')],
component_block
);
if (options.hmr) {
const accept_fn = b.arrow(
[b.id('module')],
b.block([b.stmt(b.call('$.set', b.id('s'), b.member(b.id('module'), b.id('default'))))])
);
body.push(
component,
b.if(
b.id('import.meta.hot'),
b.block([
b.const(b.id('s'), b.call('$.source', b.id(analysis.name))),
b.const(b.id('filename'), b.member(b.id(analysis.name), b.id('filename'))),
b.stmt(b.assignment('=', b.id(analysis.name), b.call('$.hmr', b.id('s')))),
b.stmt(
b.assignment('=', b.member(b.id(analysis.name), b.id('filename')), b.id('filename'))
),
b.if(
b.id('import.meta.hot.acceptExports'),
b.block([
b.stmt(
b.call('import.meta.hot.acceptExports', b.array([b.literal('default')]), accept_fn)
)
]),
b.block([b.stmt(b.call('import.meta.hot.accept', accept_fn))])
)
])
),
b.export_default(b.id(analysis.name))
);
} else {
body.push(b.export_default(component));
}
if (options.dev) {
if (options.filename) {
let filename = options.filename;
if (/(\/|\w:)/.test(options.filename)) {
// filename is absolute — truncate it
const parts = filename.split(/[/\\]/);
filename = parts.length > 3 ? ['...', ...parts.slice(-3)].join('/') : filename;
}
// add `App.filename = 'App.svelte'` so that we can print useful messages later
body.unshift(
b.stmt(
b.assignment('=', b.member(b.id(analysis.name), b.id('filename')), b.literal(filename))
)
);
}
body.unshift(b.stmt(b.call(b.id('$.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.legacy.componentApi) {
body.unshift(b.imports([['createClassComponent', '$$_createClassComponent']], 'svelte/legacy'));
component_block.body.unshift(
b.if(
b.binary('===', b.id('new.target'), b.id(analysis.name)),
b.return(
b.call(
'$$_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 (options.dev) {
component_block.body.unshift(
b.if(
b.binary('===', b.id('new.target'), b.id(analysis.name)),
b.throw_error(
`Instantiating a component with \`new\` is no longer valid in Svelte 5. ` +
'See https://svelte-5-preview.vercel.app/docs/breaking-changes#components-are-no-longer-classes for more information'
)
)
);
}
if (state.events.size > 0) {
body.push(
b.stmt(b.call('$.delegate', b.array(Array.from(state.events).map((name) => b.literal(name)))))
);
}
if (analysis.custom_element) {
const ce = analysis.custom_element;
/** @type {import('estree').Property[]} */
const props_str = [];
for (const [name, binding] of properties) {
const key = binding.prop_alias ?? name;
const prop_def = typeof ce === 'boolean' ? {} : ce.props?.[key] || {};
if (
!prop_def.type &&
binding.initial?.type === 'Literal' &&
typeof binding.initial.value === 'boolean'
) {
prop_def.type = 'Boolean';
}
const value = b.object(
/** @type {import('estree').Property[]} */ (
[
prop_def.attribute ? b.init('attribute', b.literal(prop_def.attribute)) : undefined,
prop_def.reflect ? b.init('reflect', b.literal(true)) : undefined,
prop_def.type ? b.init('type', b.literal(prop_def.type)) : undefined
].filter(Boolean)
)
);
props_str.push(b.init(key, value));
}
const slots_str = b.array([...analysis.slot_names.keys()].map((name) => b.literal(name)));
const accessors_str = b.array(
analysis.exports.map(({ name, alias }) => b.literal(alias ?? name))
);
const use_shadow_dom = typeof ce === 'boolean' || ce.shadow !== 'none' ? true : false;
const create_ce = b.call(
'$.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 customElement option is set, we define the custom element directly. Else we still create
// the custom element class so that the user may instantiate a custom element themselves later.
if (typeof ce !== 'boolean') {
body.push(b.stmt(b.call('customElements.define', b.literal(ce.tag), create_ce)));
} else {
body.push(b.stmt(create_ce));
}
}
return {
type: 'Program',
sourceType: 'module',
body
};
}
/**
* @param {import('../../types').Analysis} analysis
* @param {import('#compiler').ValidatedModuleCompileOptions} options
* @returns {import('estree').Program}
*/
export function client_module(analysis, options) {
/** @type {import('./types').ClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
legacy_reactive_statements: new Map(),
public_state: new Map(),
private_state: new Map(),
in_constructor: false
};
const module = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.module.ast),
state,
combine_visitors(
set_scope(analysis.module.scopes),
global_visitors,
// @ts-expect-error
javascript_visitors,
javascript_visitors_runes
)
)
);
return {
type: 'Program',
sourceType: 'module',
body: [b.import_all('$', 'svelte/internal/client'), ...module.body]
};
}
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