ExportNamedDeclaration.js — svelte Source File

Source Code

/** @import { ExportNamedDeclaration, Identifier } from 'estree' */
/** @import { Context } from '../types' */
import * as e from '../../../errors.js';
import { extract_identifiers } from '../../../utils/ast.js';

/**
 * @param {ExportNamedDeclaration} node
 * @param {Context} context
 */
export function ExportNamedDeclaration(node, context) {
	// visit children, so bindings are correctly initialised
	context.next();

	if (
		context.state.ast_type &&
		node.specifiers.some((specifier) =>
			specifier.exported.type === 'Identifier'
				? specifier.exported.name === 'default'
				: specifier.exported.value === 'default'
		)
	) {
		e.module_illegal_default_export(node);
	}

	if (node.declaration?.type === 'VariableDeclaration') {
		// in runes mode, forbid `export let`
		if (
			context.state.analysis.runes &&
			context.state.ast_type === 'instance' &&
			node.declaration.kind === 'let'
		) {
			e.legacy_export_invalid(node);
		}

		for (const declarator of node.declaration.declarations) {
			for (const id of extract_identifiers(declarator.id)) {
				const binding = context.state.scope.get(id.name);
				if (!binding) continue;

				if (binding.kind === 'derived') {
					e.derived_invalid_export(node);
				}

				if ((binding.kind === 'state' || binding.kind === 'raw_state') && binding.reassigned) {
					e.state_invalid_export(node);
				}
			}
		}
	}

	if (context.state.analysis.runes) {
		if (node.declaration && context.state.ast_type === 'instance') {
			if (
				node.declaration.type === 'FunctionDeclaration' ||
				node.declaration.type === 'ClassDeclaration'
			) {
				context.state.analysis.exports.push({
					name: /** @type {Identifier} */ (node.declaration.id).name,
					alias: null
				});
			} else if (node.declaration.kind === 'const') {
				for (const declarator of node.declaration.declarations) {
					for (const node of extract_identifiers(declarator.id)) {
						context.state.analysis.exports.push({ name: node.name, alias: null });
					}
				}
			}
		}
	}
}