Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import * as b from '../../../../utils/builders.js';
import { extract_paths } from '../../../../utils/ast.js';
import { get_prop_source, serialize_get_binding } from '../utils.js';
/**
* Creates the output for a state declaration.
* @param {import('estree').VariableDeclarator} declarator
* @param {import('../../../scope.js').Scope} scope
* @param {import('estree').Expression} value
*/
function create_state_declarators(declarator, scope, value) {
if (declarator.id.type === 'Identifier') {
return [b.declarator(declarator.id, b.call('$.mutable_source', value))];
}
const tmp = scope.generate('tmp');
const paths = extract_paths(declarator.id);
return [
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = scope.get(/** @type {import('estree').Identifier} */ (path.node).name);
return b.declarator(
path.node,
binding?.kind === 'state' ? b.call('$.mutable_source', value) : value
);
})
];
}
/** @type {import('../types.js').ComponentVisitors} */
export const javascript_visitors_legacy = {
VariableDeclaration(node, { state, visit }) {
/** @type {import('estree').VariableDeclarator[]} */
const declarations = [];
for (const declarator of node.declarations) {
const bindings = /** @type {import('#compiler').Binding[]} */ (
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_hoistable_function(init)) {
const hoistable_function = visit(init);
state.hoisted.push(
b.declaration(
'const',
declarator.id,
/** @type {import('estree').Expression} */ (hoistable_function)
)
);
continue;
}
declarations.push(/** @type {import('estree').VariableDeclarator} */ (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 = state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(
b.id(tmp),
/** @type {import('estree').Expression} */ (
visit(/** @type {import('estree').Expression} */ (declarator.init))
)
)
);
for (const path of paths) {
const name = /** @type {import('estree').Identifier} */ (path.node).name;
const binding = /** @type {import('#compiler').Binding} */ (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, state, binding.prop_alias ?? name, value)
: value
)
);
}
continue;
}
const binding = /** @type {import('#compiler').Binding} */ (
state.scope.get(declarator.id.name)
);
declarations.push(
b.declarator(
declarator.id,
get_prop_source(
binding,
state,
binding.prop_alias ?? declarator.id.name,
declarator.init && /** @type {import('estree').Expression} */ (visit(declarator.init))
)
)
);
continue;
}
declarations.push(
...create_state_declarators(
declarator,
state.scope,
/** @type {import('estree').Expression} */ (declarator.init && visit(declarator.init))
)
);
}
if (declarations.length === 0) {
return b.empty;
}
return {
...node,
declarations
};
},
LabeledStatement(node, context) {
if (context.path.length > 1 || node.label.name !== '$') {
context.next();
return;
}
const state = context.state;
// To recreate Svelte 4 behaviour, we track the dependencies
// the compiler can 'see', but we untrack the effect itself
const reactive_stmt = /** @type {import('#compiler').ReactiveStatement} */ (
state.analysis.reactive_statements.get(node)
);
if (!reactive_stmt) return; // not the instance context
const { dependencies } = reactive_stmt;
let serialized_body = /** @type {import('estree').Statement} */ (context.visit(node.body));
if (serialized_body.type !== 'BlockStatement') {
serialized_body = b.block([serialized_body]);
}
const body = serialized_body.body;
/** @type {import('estree').Expression[]} */
const sequence = [];
for (const binding of dependencies) {
if (binding.kind === 'normal') continue;
const name = binding.node.name;
let serialized = serialize_get_binding(b.id(name), state);
// If the binding is a prop, we need to deep read it because it could be fine-grained $state
// from a runes-component, where mutations don't trigger an update on the prop as a whole.
if (name === '$$props' || name === '$$restProps' || binding.kind === 'bindable_prop') {
serialized = b.call('$.deep_read_state', serialized);
}
sequence.push(serialized);
}
// these statements will be topologically ordered later
state.legacy_reactive_statements.set(
node,
b.stmt(
b.call(
'$.legacy_pre_effect',
sequence.length > 0 ? b.thunk(b.sequence(sequence)) : b.thunk(b.block([])),
b.thunk(b.block(body))
)
)
);
return b.empty;
},
BreakStatement(node, context) {
if (!node.label || node.label.name !== '$') return;
const in_reactive_statement =
context.path[1].type === 'LabeledStatement' && context.path[1].label.name === '$';
if (in_reactive_statement) {
return b.return();
}
}
};
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