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/** @import { ValidatedCompileOptions, SvelteNode, ValidatedModuleCompileOptions } 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 { 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 { filename } from '../../../state.js';
/**
* This function ensures visitor sets don't accidentally clobber each other
* @param {...Visitors} array
* @returns {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: ${key}`);
}
// @ts-ignore
visitors[key] = member[key];
}
}
return visitors;
}
/**
* @param {string} source
* @param {ComponentAnalysis} analysis
* @param {ValidatedCompileOptions} options
* @returns {ESTree.Program}
*/
export function client_component(source, analysis, options) {
/** @type {ComponentClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.template.scopes,
hoisted: [b.import_all('$', 'svelte/internal/client')],
node: /** @type {any} */ (null), // populated by the root node
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,
// 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,
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 {ESTree.Program} */ (
walk(
/** @type {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 {ESTree.Program} */ (
walk(
/** @type {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('$$_import_' + name, b.call('$.reactive_import', b.thunk(b.id(name))))
);
}
}
}
/** @type {ESTree.Statement[]} */
const store_setup = [];
/** @type {ESTree.VariableDeclaration[]} */
const legacy_reactive_declarations = [];
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'legacy_reactive') {
legacy_reactive_declarations.push(b.const(name, b.call('$.mutable_source')));
}
if (binding.kind === 'store_sub') {
if (store_setup.length === 0) {
store_setup.push(b.const('$$stores', b.call('$.setup_stores')));
}
// We're creating an arrow function that gets the store value which minifies better for two or more references
const store_reference = serialize_get_binding(b.id(name.slice(1)), instance_state);
const store_get = b.call('$.store_get', store_reference, b.literal(name), b.id('$$stores'));
store_setup.push(
b.const(
binding.node,
options.dev
? b.thunk(
b.sequence([
b.call('$.validate_store', store_reference, b.literal(name.slice(1))),
store_get
])
)
: b.thunk(store_get)
)
);
}
}
for (const [node] of analysis.reactive_statements) {
const statement = [...state.legacy_reactive_statements].find(([n]) => n === node);
if (statement === undefined) {
throw new Error('Could not find reactive statement');
}
instance.body.push(statement[1]);
}
if (analysis.reactive_statements.size > 0) {
instance.body.push(b.stmt(b.call('$.legacy_pre_effect_reset')));
}
/**
* Used to store the group nodes
* @type {ESTree.VariableDeclaration[]}
*/
const group_binding_declarations = [];
for (const group of analysis.binding_groups.values()) {
group_binding_declarations.push(b.const(group.name, b.array([])));
}
/** @type {Array<ESTree.Property | ESTree.SpreadElement>} */
const component_returned_object = analysis.exports.flatMap(({ name, alias }) => {
const binding = instance_state.scope.get(name);
const expression = serialize_get_binding(b.id(name), instance_state);
const getter = b.get(alias ?? name, [b.return(expression)]);
if (expression.type === 'Identifier') {
if (binding?.declaration_kind === 'let' || binding?.declaration_kind === 'var') {
return [
getter,
b.set(alias ?? name, [b.stmt(b.assignment('=', expression, b.id('$$value')))])
];
} else if (!options.dev) {
return b.init(alias ?? name, expression);
}
}
if (binding?.kind === 'state' || binding?.kind === 'frozen_state') {
return [
getter,
b.set(alias ?? name, [
b.stmt(
b.call(
'$.set',
b.id(name),
b.call(binding.kind === 'state' ? '$.proxy' : '$.freeze', b.id('$$value'))
)
)
])
];
}
return getter;
});
const properties = [...analysis.instance.scope.declarations].filter(
([name, binding]) =>
(binding.kind === 'prop' || binding.kind === 'bindable_prop') && !name.startsWith('$$')
);
if (analysis.runes && options.dev) {
const exports = analysis.exports.map(({ name, alias }) => b.literal(alias ?? name));
/** @type {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 (options.dev) {
component_returned_object.push(b.spread(b.call(b.id('$.legacy_api'))));
}
const push_args = [b.id('$$props'), b.literal(analysis.runes)];
if (options.dev) push_args.push(b.id(analysis.name));
const component_block = b.block([
...store_setup,
...legacy_reactive_declarations,
...group_binding_declarations,
...analysis.top_level_snippets,
.../** @type {ESTree.Statement[]} */ (instance.body),
analysis.runes || !analysis.needs_context ? b.empty : b.stmt(b.call('$.init')),
.../** @type {ESTree.Statement[]} */ (template.body)
]);
if (!analysis.runes) {
// Bind static exports to props so that people can access them with bind:x
for (const { name, alias } of analysis.exports) {
component_block.body.push(
b.stmt(
b.call(
'$.bind_prop',
b.id('$$props'),
b.literal(alias ?? name),
serialize_get_binding(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('$$css')))
);
}
const should_inject_context =
analysis.needs_context ||
analysis.reactive_statements.size > 0 ||
component_returned_object.length > 0 ||
options.dev;
if (should_inject_context) {
component_block.body.unshift(b.stmt(b.call('$.push', ...push_args)));
component_block.body.push(
component_returned_object.length > 0
? b.return(b.call('$.pop', b.object(component_returned_object)))
: b.stmt(b.call('$.pop'))
);
}
if (analysis.uses_rest_props) {
const named_props = analysis.exports.map(({ name, alias }) => alias ?? name);
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop') named_props.push(binding.prop_alias ?? name);
}
component_block.body.unshift(
b.const(
'$$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('$$events'),
b.literal('$$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('$$props'))));
}
let should_inject_props =
should_inject_context ||
analysis.needs_props ||
analysis.uses_props ||
analysis.uses_rest_props ||
analysis.uses_slots ||
analysis.slot_names.size > 0;
const body = [...state.hoisted, ...module.body];
const component = b.function_declaration(
b.id(analysis.name),
should_inject_props ? [b.id('$$anchor'), b.id('$$props')] : [b.id('$$anchor')],
component_block
);
if (options.hmr) {
const accept_fn_body = [
b.stmt(b.call('$.set', b.id('s'), b.member(b.id('module.default'), b.id('$.ORIGINAL'), true)))
];
if (analysis.css.hash) {
// remove existing `<style>` element, in case CSS changed
accept_fn_body.unshift(
b.stmt(
b.call(
b.member(
b.call('document.querySelector', b.literal('#' + analysis.css.hash)),
b.id('remove'),
false,
true
)
)
)
);
}
const hmr = 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.const(b.id('$$original'), b.id(analysis.name)),
b.stmt(b.assignment('=', b.id(analysis.name), b.call('$.hmr', b.id('s')))),
b.stmt(b.assignment('=', b.member(b.id(analysis.name), b.id('filename')), b.id('filename'))),
// Assign the original component to the wrapper so we can use it on hot reload patching,
// else we would call the HMR function two times
b.stmt(
b.assignment(
'=',
b.member(b.id(analysis.name), b.id('$.ORIGINAL'), true),
b.id('$$original')
)
),
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 (options.dev) {
if (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'), 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 (options.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(
'$.create_custom_element',
b.id(analysis.name),
b.object(props_str),
slots_str,
accessors_str,
b.literal(use_shadow_dom),
/** @type {any} */ (typeof ce !== 'boolean' ? ce.extend : undefined)
);
// If customElement option is set, we define the custom element directly. Else we still create
// the custom element class so that the user may instantiate a custom element themselves later.
if (typeof ce !== 'boolean') {
body.push(b.stmt(b.call('customElements.define', b.literal(ce.tag), create_ce)));
} else {
body.push(b.stmt(create_ce));
}
}
return {
type: 'Program',
sourceType: 'module',
body
};
}
/**
* @param {Analysis} analysis
* @param {ValidatedModuleCompileOptions} options
* @returns {ESTree.Program}
*/
export function client_module(analysis, options) {
/** @type {ClientTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
legacy_reactive_statements: new Map(),
public_state: new Map(),
private_state: new Map(),
in_constructor: false
};
const module = /** @type {ESTree.Program} */ (
walk(
/** @type {SvelteNode} */ (analysis.module.ast),
state,
combine_visitors(
set_scope(analysis.module.scopes),
global_visitors,
// @ts-expect-error
javascript_visitors,
javascript_visitors_runes
)
)
);
return {
type: 'Program',
sourceType: 'module',
body: [b.import_all('$', 'svelte/internal/client'), ...module.body]
};
}
|