Tidy up parser (#10407)

* tidy up parser a bit

* better

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>

Author: Rich-Harris

packages/svelte/src/compiler/phases/1-parse/read/context.js

@@ -13,9 +13,9 @@ import { error } from '../../../errors.js';
 
 /**
  * @param {import('../index.js').Parser} parser
- * @returns {any}
+ * @returns {import('estree').Pattern}
  */
-export default function read_context(parser) {
+export default function read_pattern(parser) {
 	const start = parser.index;
 	let i = parser.index;
 

packages/svelte/src/compiler/phases/1-parse/state/element.js

@@ -65,6 +65,7 @@ export default function tag(parser) {
 		const data = parser.read_until(regex_closing_comment);
 		parser.eat('-->', true);
 
+		/** @type {ReturnType<typeof parser.append<import('#compiler').Comment>>} */
 		parser.append({
 			type: 'Comment',
 			start,