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/** @import { Binding } from '#compiler' */
/** @import { ComponentContext } from '../types' */
/** @import { Scope } from '../../../scope' */
import { dev } from '../../../../state.js';
import { extract_paths } from '../../../../utils/ast.js';
import * as b from '../../../../utils/builders.js';
import * as assert from '../../../../utils/assert.js';
import { get_rune } from '../../../scope.js';
import {
get_prop_source,
is_prop_source,
is_state_source,
should_proxy_or_freeze
} from '../utils.js';
import { is_hoisted_function } from '../../utils.js';
/**
* @param {VariableDeclaration} node
* @param {ComponentContext} context
*/
export function VariableDeclaration(node, context) {
/** @type {VariableDeclarator[]} */
const declarations = [];
if (context.state.analysis.runes) {
for (const declarator of node.declarations) {
const init = declarator.init;
const rune = get_rune(init, context.state.scope);
if (
!rune ||
rune === '$effect.tracking' ||
rune === '$effect.root' ||
rune === '$inspect' ||
rune === '$state.snapshot' ||
rune === '$state.is'
) {
if (init != null && is_hoisted_function(init)) {
context.state.hoisted.push(
b.declaration('const', declarator.id, /** @type {Expression} */ (context.visit(init)))
);
continue;
}
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (rune === '$props') {
/** @type {string[]} */
const seen = ['$$slots', '$$events', '$$legacy'];
if (context.state.analysis.custom_element) {
seen.push('$$host');
}
if (declarator.id.type === 'Identifier') {
/** @type {Expression[]} */
const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
if (dev) {
// include rest name, so we can provide informative error messages
args.push(b.literal(declarator.id.name));
}
declarations.push(b.declarator(declarator.id, b.call('$.rest_props', ...args)));
} else {
assert.equal(declarator.id.type, 'ObjectPattern');
for (const property of declarator.id.properties) {
if (property.type === 'Property') {
const key = /** @type {Identifier | Literal} */ (property.key);
const name = key.type === 'Identifier' ? key.name : /** @type {string} */ (key.value);
seen.push(name);
let id =
property.value.type === 'AssignmentPattern' ? property.value.left : property.value;
assert.equal(id.type, 'Identifier');
const binding = /** @type {Binding} */ (context.state.scope.get(id.name));
let initial =
binding.initial && /** @type {Expression} */ (context.visit(binding.initial));
// We're adding proxy here on demand and not within the prop runtime function so that
// people not using proxied state anywhere in their code don't have to pay the additional bundle size cost
if (
initial &&
binding.kind === 'bindable_prop' &&
should_proxy_or_freeze(initial, context.state.scope)
) {
initial = b.call('$.proxy', initial);
}
if (is_prop_source(binding, context.state)) {
declarations.push(
b.declarator(id, get_prop_source(binding, context.state, name, initial))
);
}
} else {
// RestElement
/** @type {Expression[]} */
const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
if (dev) {
// include rest name, so we can provide informative error messages
args.push(b.literal(/** @type {Identifier} */ (property.argument).name));
}
declarations.push(b.declarator(property.argument, b.call('$.rest_props', ...args)));
}
}
}
// TODO
continue;
}
const args = /** @type {CallExpression} */ (init).arguments;
const value =
args.length === 0 ? b.id('undefined') : /** @type {Expression} */ (context.visit(args[0]));
if (rune === '$state' || rune === '$state.frozen') {
/**
* @param {Identifier} id
* @param {Expression} value
*/
const create_state_declarator = (id, value) => {
const binding = /** @type {import('#compiler').Binding} */ (
context.state.scope.get(id.name)
);
if (should_proxy_or_freeze(value, context.state.scope)) {
value = b.call(rune === '$state' ? '$.proxy' : '$.freeze', value);
}
if (is_state_source(binding, context.state)) {
value = b.call('$.source', value);
}
return value;
};
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(declarator.id, create_state_declarator(declarator.id, value))
);
} else {
const tmp = context.state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = context.state.scope.get(/** @type {Identifier} */ (path.node).name);
return b.declarator(
path.node,
binding?.kind === 'state' || binding?.kind === 'frozen_state'
? create_state_declarator(binding.node, value)
: value
);
})
);
}
continue;
}
if (rune === '$derived' || rune === '$derived.by') {
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(
declarator.id,
b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value))
)
);
} else {
const bindings = extract_paths(declarator.id);
const init = /** @type {CallExpression} */ (declarator.init);
/** @type {Identifier} */
let id;
let rhs = value;
if (init.arguments[0].type === 'Identifier') {
id = init.arguments[0];
} else {
id = b.id(context.state.scope.generate('$$d'));
rhs = b.call('$.get', id);
declarations.push(
b.declarator(id, b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value)))
);
}
for (let i = 0; i < bindings.length; i++) {
const binding = bindings[i];
declarations.push(
b.declarator(binding.node, b.call('$.derived', b.thunk(binding.expression(rhs))))
);
}
}
continue;
}
}
} else {
for (const declarator of node.declarations) {
const bindings = /** @type {Binding[]} */ (context.state.scope.get_bindings(declarator));
const has_state = bindings.some((binding) => binding.kind === 'state');
const has_props = bindings.some((binding) => binding.kind === 'bindable_prop');
if (!has_state && !has_props) {
const init = declarator.init;
if (init != null && is_hoisted_function(init)) {
context.state.hoisted.push(
b.declaration('const', declarator.id, /** @type {Expression} */ (context.visit(init)))
);
continue;
}
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (has_props) {
if (declarator.id.type !== 'Identifier') {
// Turn export let into props. It's really really weird because export let { x: foo, z: [bar]} = ..
// means that foo and bar are the props (i.e. the leafs are the prop names), not x and z.
const tmp = context.state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(
b.id(tmp),
/** @type {Expression} */ (context.visit(/** @type {Expression} */ (declarator.init)))
)
);
for (const path of paths) {
const name = /** @type {Identifier} */ (path.node).name;
const binding = /** @type {Binding} */ (context.state.scope.get(name));
const value = path.expression?.(b.id(tmp));
declarations.push(
b.declarator(
path.node,
binding.kind === 'bindable_prop'
? get_prop_source(binding, context.state, binding.prop_alias ?? name, value)
: value
)
);
}
continue;
}
const binding = /** @type {Binding} */ (context.state.scope.get(declarator.id.name));
declarations.push(
b.declarator(
declarator.id,
get_prop_source(
binding,
context.state,
binding.prop_alias ?? declarator.id.name,
declarator.init && /** @type {Expression} */ (context.visit(declarator.init))
)
)
);
continue;
}
declarations.push(
...create_state_declarators(
declarator,
context.state.scope,
/** @type {Expression} */ (declarator.init && context.visit(declarator.init))
)
);
}
}
if (declarations.length === 0) {
return b.empty;
}
return {
...node,
declarations
};
}
/**
* Creates the output for a state declaration.
* @param {VariableDeclarator} declarator
* @param {Scope} scope
* @param {Expression} value
*/
function create_state_declarators(declarator, scope, value) {
if (declarator.id.type === 'Identifier') {
return [b.declarator(declarator.id, b.call('$.mutable_source', value))];
}
const tmp = scope.generate('tmp');
const paths = extract_paths(declarator.id);
return [
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = scope.get(/** @type {Identifier} */ (path.node).name);
return b.declarator(
path.node,
binding?.kind === 'state' ? b.call('$.mutable_source', value) : value
);
})
];
}
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