chore: remove some unused code (#9593)

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

.changeset/two-falcons-buy.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: remove unused code

packages/svelte/src/compiler/phases/1-parse/acorn.js

@@ -58,7 +58,6 @@ export function get_comment_handlers(source) {
 	 * @typedef {import('estree').Comment & {
 	 *   start: number;
 	 *   end: number;
-	 *   has_trailing_newline?: boolean
 	 * }} CommentWithLocation
 	 */
 
@@ -91,35 +90,26 @@ export function get_comment_handlers(source) {
 		add_comments(ast) {
 			if (comments.length === 0) return;
 
-			walk(
+			walk(ast, null, {
-				ast,
+				_(node, { next }) {
-				{},
+					let comment;
-				{
-					_(node, { next }) {
-						let comment;
 
-						while (comments[0] && comments[0].start < node.start) {
+					while (comments[0] && comments[0].start < node.start) {
-							comment = /** @type {CommentWithLocation} */ (comments.shift());
+						comment = /** @type {CommentWithLocation} */ (comments.shift());
-
+						(node.leadingComments ||= []).push(comment);
-							const next = comments[0] || node;
+					}
-							comment.has_trailing_newline =
-								comment.type === 'Line' || /\n/.test(source.slice(comment.end, next.start));
-
-							(node.leadingComments ||= []).push(comment);
-						}
 
-						next();
+					next();
 
-						if (comments[0]) {
+					if (comments[0]) {
-							const slice = source.slice(node.end, comments[0].start);
+						const slice = source.slice(node.end, comments[0].start);
 
-							if (/^[,) \t]*$/.test(slice)) {
+						if (/^[,) \t]*$/.test(slice)) {
-								node.trailingComments = [/** @type {CommentWithLocation} */ (comments.shift())];
+							node.trailingComments = [/** @type {CommentWithLocation} */ (comments.shift())];
-							}
 						}
 					}
 				}
-			);
+			});
 		}
 	};
 }

packages/svelte/src/compiler/phases/3-transform/client/visitors/template.js

@@ -1087,9 +1087,7 @@ function create_block(parent, name, nodes, context) {
 		/** @type {import('estree').Statement} */ (update).leadingComments = [
 			{
 				type: 'Block',
-				value: ` Update `,
+				value: ` Update `
-				// @ts-expect-error
-				has_trailing_newline: true
 			}
 		];
 	}
@@ -1107,9 +1105,7 @@ function create_block(parent, name, nodes, context) {
 		body[0].leadingComments = [
 			{
 				type: 'Block',
-				value: ` Init `,
+				value: ` Init `
-				// @ts-expect-error
-				has_trailing_newline: true
 			}
 		];
 	}

packages/svelte/src/compiler/phases/3-transform/index.js

@@ -32,15 +32,11 @@ export function transform_component(analysis, source, options) {
 		program.body[0].leadingComments = [
 			{
 				type: 'Line',
-				value: ` ${basename} (Svelte v${VERSION})`,
+				value: ` ${basename} (Svelte v${VERSION})`
-				// @ts-ignore
-				has_trailing_newline: true
 			},
 			{
 				type: 'Line',
-				value: ' Note: compiler output will change before 5.0 is released!',
+				value: ' Note: compiler output will change before 5.0 is released!'
-				// @ts-ignore
-				has_trailing_newline: true
 			}
 		];
 	}
@@ -86,9 +82,7 @@ export function transform_module(analysis, source, options) {
 		program.body[0].leadingComments = [
 			{
 				type: 'Block',
-				value: ` ${basename} generated by Svelte v${VERSION} `,
+				value: ` ${basename} generated by Svelte v${VERSION} `
-				// @ts-ignore
-				has_trailing_newline: true
 			}
 		];
 	}

packages/svelte/tests/parser-legacy/samples/javascript-comments/output.json

@@ -109,8 +109,7 @@
 												"type": "Block",
 												"value": " another comment ",
 												"start": 163,
-												"end": 184,
+												"end": 184
-												"has_trailing_newline": true
 											}
 										]
 									}
@@ -121,8 +120,7 @@
 									"type": "Line",
 									"value": " comment",
 									"start": 141,
-									"end": 151,
+									"end": 151
-									"has_trailing_newline": true
 								}
 							]
 						}
@@ -222,8 +220,7 @@
 							"type": "Line",
 							"value": " a leading comment",
 							"start": 10,
-							"end": 30,
+							"end": 30
-							"has_trailing_newline": true
 						}
 					],
 					"trailingComments": [
@@ -290,8 +287,7 @@
 							"type": "Block",
 							"value": "* a comment ",
 							"start": 72,
-							"end": 88,
+							"end": 88
-							"has_trailing_newline": true
 						}
 					]
 				}