VariableDeclaration.js — svelte Source File

Source Code

/** @import { CallExpression, Expression, Identifier, Literal, VariableDeclaration, VariableDeclarator } from 'estree' */
/** @import { Binding } from '#compiler' */
/** @import { ComponentContext } from '../types' */
import { dev, is_ignored, locate_node } from '../../../../state.js';
import { extract_paths, save } from '../../../../utils/ast.js';
import * as b from '#compiler/builders';
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 } from '../utils.js';
import { get_value } from './shared/declarations.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 = /** @type {Expression} */ (declarator.init);
			const rune = get_rune(init, context.state.scope);

			if (
				!rune ||
				rune === '$effect.tracking' ||
				rune === '$effect.root' ||
				rune === '$inspect' ||
				rune === '$inspect.trace' ||
				rune === '$state.snapshot' ||
				rune === '$host'
			) {
				declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
				continue;
			}

			if (rune === '$props.id') {
				// skip
				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)));
// ... (363 more lines)