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/** @import { Context } from '../types' */
import is_reference from 'is-reference';
import { should_proxy_or_freeze } from '../../3-transform/client/utils.js';
import * as e from '../../../errors.js';
import * as w from '../../../warnings.js';
import { is_rune } from '../../../../utils.js';
/**
* @param {Identifier} node
* @param {Context} context
*/
export function Identifier(node, context) {
let i = context.path.length;
let parent = /** @type {Expression} */ (context.path[--i]);
if (!is_reference(node, parent)) {
return;
}
// If we are using arguments outside of a function, then throw an error
if (
node.name === 'arguments' &&
!context.path.some((n) => n.type === 'FunctionDeclaration' || n.type === 'FunctionExpression')
) {
e.invalid_arguments_usage(node);
}
// `$$slots` exists even in runes mode
if (node.name === '$$slots') {
context.state.analysis.uses_slots = true;
}
if (context.state.analysis.runes) {
if (
is_rune(node.name) &&
context.state.scope.get(node.name) === null &&
context.state.scope.get(node.name.slice(1)) === null
) {
/** @type {Expression} */
let current = node;
let name = node.name;
while (parent.type === 'MemberExpression') {
if (parent.computed) e.rune_invalid_computed_property(parent);
name += `.${/** @type {Identifier} */ (parent.property).name}`;
current = parent;
parent = /** @type {Expression} */ (context.path[--i]);
if (!is_rune(name)) {
if (name === '$effect.active') {
e.rune_renamed(parent, '$effect.active', '$effect.tracking');
}
e.rune_invalid_name(parent, name);
}
}
if (parent.type !== 'CallExpression') {
e.rune_missing_parentheses(current);
}
}
}
let binding = context.state.scope.get(node.name);
if (!context.state.analysis.runes) {
if (node.name === '$$props') {
context.state.analysis.uses_props = true;
}
if (node.name === '$$restProps') {
context.state.analysis.uses_rest_props = true;
}
if (
binding?.kind === 'normal' &&
((binding.scope === context.state.instance_scope &&
binding.declaration_kind !== 'function') ||
binding.declaration_kind === 'import')
) {
if (
binding.declaration_kind !== 'import' &&
binding.mutated &&
// TODO could be more fine-grained - not every mention in the template implies a state binding
(context.state.reactive_statement || context.state.ast_type === 'template')
) {
binding.kind = 'state';
} else if (
context.state.reactive_statement &&
parent.type === 'AssignmentExpression' &&
parent.left === binding.node
) {
binding.kind = 'derived';
}
} else if (binding?.kind === 'each' && binding.mutated) {
// Ensure that the array is marked as reactive even when only its entries are mutated
let i = context.path.length;
while (i--) {
const ancestor = context.path[i];
if (
ancestor.type === 'EachBlock' &&
context.state.analysis.template.scopes.get(ancestor)?.declarations.get(node.name) ===
binding
) {
for (const binding of ancestor.metadata.references) {
if (binding.kind === 'normal') {
binding.kind = 'state';
}
}
break;
}
}
}
}
if (binding) {
if (context.state.expression) {
context.state.expression.dependencies.add(binding);
context.state.expression.has_state ||= binding.kind !== 'normal';
}
if (
context.state.analysis.runes &&
node !== binding.node &&
context.state.function_depth === binding.scope.function_depth &&
// If we have $state that can be proxied or frozen and isn't re-assigned, then that means
// it's likely not using a primitive value and thus this warning isn't that helpful.
((binding.kind === 'state' &&
(binding.reassigned ||
(binding.initial?.type === 'CallExpression' &&
binding.initial.arguments.length === 1 &&
binding.initial.arguments[0].type !== 'SpreadElement' &&
!should_proxy_or_freeze(binding.initial.arguments[0], context.state.scope)))) ||
binding.kind === 'frozen_state' ||
binding.kind === 'derived') &&
// We're only concerned with reads here
(parent.type !== 'AssignmentExpression' || parent.left !== node) &&
parent.type !== 'UpdateExpression'
) {
w.state_referenced_locally(node);
}
}
}
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