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/** @import { Binding } from '#compiler' */
/** @import { Context } from '../types.js' */
/** @import { Scope } from '../../../scope.js' */
import { build_fallback, extract_paths } from '../../../../utils/ast.js';
import * as b from '../../../../utils/builders.js';
import { get_rune } from '../../../scope.js';
import { walk } from 'zimmerframe';
/**
* @param {VariableDeclaration} node
* @param {Context} 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 === '$effect.tracking' || rune === '$inspect' || rune === '$effect.root') {
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (rune === '$props') {
let has_rest = false;
// remove $bindable() from props declaration
let id = walk(declarator.id, null, {
RestElement(node, context) {
if (context.path.at(-1) === declarator.id) {
has_rest = true;
}
},
AssignmentPattern(node) {
if (
node.right.type === 'CallExpression' &&
get_rune(node.right, context.state.scope) === '$bindable'
) {
const right = node.right.arguments.length
? /** @type {Expression} */ (context.visit(node.right.arguments[0]))
: b.id('undefined');
return b.assignment_pattern(node.left, right);
}
}
});
if (id.type === 'ObjectPattern' && has_rest) {
// If a rest pattern is used within an object pattern, we need to ensure we don't expose $$slots or $$events
id.properties.splice(
id.properties.length - 1,
0,
// @ts-ignore
b.prop('init', b.id('$$slots'), b.id('$$slots')),
b.prop('init', b.id('$$events'), b.id('$$events'))
);
} else if (id.type === 'Identifier') {
// If $props is referenced as an identifier, we need to ensure we don't expose $$slots or $$events as properties
// on the identifier reference
id = b.object_pattern([
b.prop('init', b.id('$$slots'), b.id('$$slots')),
b.prop('init', b.id('$$events'), b.id('$$events')),
b.rest(b.id(id.name))
]);
}
declarations.push(
b.declarator(/** @type {Pattern} */ (context.visit(id)), b.id('$$props'))
);
continue;
}
const args = /** @type {CallExpression} */ (init).arguments;
const value =
args.length === 0 ? b.id('undefined') : /** @type {Expression} */ (context.visit(args[0]));
if (rune === '$derived.by') {
declarations.push(
b.declarator(/** @type {Pattern} */ (context.visit(declarator.id)), b.call(value))
);
continue;
}
if (declarator.id.type === 'Identifier') {
declarations.push(b.declarator(declarator.id, value));
continue;
}
if (rune === '$derived') {
declarations.push(
b.declarator(/** @type {Pattern} */ (context.visit(declarator.id)), value)
);
continue;
}
declarations.push(...create_state_declarators(declarator, context.state.scope, value));
}
} else {
for (const declarator of node.declarations) {
const bindings = /** @type {Binding[]} */ (context.state.scope.get_bindings(declarator));
const has_state = bindings.some((binding) => binding.kind === 'state');
const has_props = bindings.some((binding) => binding.kind === 'bindable_prop');
if (!has_state && !has_props) {
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (has_props) {
if (declarator.id.type !== 'Identifier') {
// Turn export let into props. It's really really weird because export let { x: foo, z: [bar]} = ..
// means that foo and bar are the props (i.e. the leafs are the prop names), not x and z.
const tmp = context.state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(
b.id(tmp),
/** @type {Expression} */ (context.visit(/** @type {Expression} */ (declarator.init)))
)
);
for (const path of paths) {
const value = path.expression?.(b.id(tmp));
const name = /** @type {Identifier} */ (path.node).name;
const binding = /** @type {Binding} */ (context.state.scope.get(name));
const prop = b.member(b.id('$$props'), b.literal(binding.prop_alias ?? name), true);
declarations.push(b.declarator(path.node, build_fallback(prop, value)));
}
continue;
}
const binding = /** @type {Binding} */ (context.state.scope.get(declarator.id.name));
const prop = b.member(
b.id('$$props'),
b.literal(binding.prop_alias ?? declarator.id.name),
true
);
/** @type {Expression} */
let init = prop;
if (declarator.init) {
const default_value = /** @type {Expression} */ (context.visit(declarator.init));
init = build_fallback(prop, default_value);
}
declarations.push(b.declarator(declarator.id, init));
continue;
}
declarations.push(
...create_state_declarators(
declarator,
context.state.scope,
/** @type {Expression} */ (declarator.init && context.visit(declarator.init))
)
);
}
}
return {
...node,
declarations
};
}
/**
* @param {VariableDeclarator} declarator
* @param {Scope} scope
* @param {Expression} value
* @returns {VariableDeclarator[]}
*/
function create_state_declarators(declarator, scope, value) {
if (declarator.id.type === 'Identifier') {
return [b.declarator(declarator.id, value)];
}
const tmp = scope.generate('tmp');
const paths = extract_paths(declarator.id);
return [
b.declarator(b.id(tmp), value), // TODO inject declarator for opts, so we can use it below
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
return b.declarator(path.node, value);
})
];
}
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