fix: switch to our fork acorn typescript plugin (#15393)

* fix: switch to our fork acorn typescript plugin

* changeset

* bump

* bump

* bump

* adjust snapshots

* this should be obsolete now

* bump

* bump

.changeset/selfish-cougars-allow.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: switch acorn-typescript plugin

packages/svelte/package.json

@@ -150,7 +150,7 @@
     "@jridgewell/sourcemap-codec": "^1.5.0",
     "@types/estree": "^1.0.5",
     "acorn": "^8.12.1",
-    "acorn-typescript": "^1.4.13",
+    "@sveltejs/acorn-typescript": "^1.0.5",
     "aria-query": "^5.3.1",
     "axobject-query": "^4.1.0",
     "clsx": "^2.1.1",

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

@@ -1,11 +1,9 @@
 /** @import { Comment, Program } from 'estree' */
-/** @import { Node } from 'acorn' */
 import * as acorn from 'acorn';
 import { walk } from 'zimmerframe';
-import { tsPlugin } from 'acorn-typescript';
-import { locator } from '../../state.js';
+import { tsPlugin } from '@sveltejs/acorn-typescript';
 
-const ParserWithTS = acorn.Parser.extend(tsPlugin({ allowSatisfies: true }));
+const ParserWithTS = acorn.Parser.extend(tsPlugin());
 
 /**
  * @param {string} source
@@ -48,7 +46,6 @@ export function parse(source, typescript, is_script) {
 		}
 	}
 
-	if (typescript) amend(source, ast);
 	add_comments(ast);
 
 	return /** @type {Program} */ (ast);
@@ -71,7 +68,6 @@ export function parse_expression_at(source, typescript, index) {
 		locations: true
 	});
 
-	if (typescript) amend(source, ast);
 	add_comments(ast);
 
 	return ast;
@@ -173,42 +169,3 @@ function get_comment_handlers(source) {
 		}
 	};
 }
-
-/**
- * Tidy up some stuff left behind by acorn-typescript
- * @param {string} source
- * @param {Node} node
- */
-function amend(source, node) {
-	return walk(node, null, {
-		_(node, context) {
-			// @ts-expect-error
-			delete node.loc.start.index;
-			// @ts-expect-error
-			delete node.loc.end.index;
-
-			if (typeof node.loc?.end === 'number') {
-				const loc = locator(node.loc.end);
-				if (loc) {
-					node.loc.end = {
-						line: loc.line,
-						column: loc.column
-					};
-				}
-			}
-
-			if (
-				/** @type {any} */ (node).typeAnnotation &&
-				(node.end === undefined || node.end < node.start)
-			) {
-				// i think there might be a bug in acorn-typescript that prevents
-				// `end` from being assigned when there's a type annotation
-				let end = /** @type {any} */ (node).typeAnnotation.start;
-				while (/\s/.test(source[end - 1])) end -= 1;
-				node.end = end;
-			}
-
-			context.next();
-		}
-	});
-}

packages/svelte/tests/parser-modern/samples/comment-before-script/output.json

@@ -75,7 +75,7 @@
 							"id": {
 								"type": "Identifier",
 								"start": 52,
-								"end": 57,
+								"end": 65,
 								"loc": {
 									"start": {
 										"line": 3,

packages/svelte/tests/parser-modern/samples/snippets/output.json

@@ -28,7 +28,7 @@
 					{
 						"type": "Identifier",
 						"start": 43,
-						"end": 46,
+						"end": 54,
 						"loc": {
 							"start": {
 								"line": 3,

packages/svelte/tests/parser-modern/samples/typescript-in-event-handler/output.json

@@ -25,7 +25,6 @@
 						"end": 147,
 						"type": "OnDirective",
 						"name": "click",
-						"modifiers": [],
 						"expression": {
 							"type": "ArrowFunctionExpression",
 							"start": 73,
@@ -48,7 +47,7 @@
 								{
 									"type": "Identifier",
 									"start": 74,
-									"end": 75,
+									"end": 87,
 									"loc": {
 										"start": {
 											"line": 6,
@@ -155,7 +154,7 @@
 												"id": {
 													"type": "Identifier",
 													"start": 102,
-													"end": 106,
+													"end": 114,
 													"loc": {
 														"start": {
 															"line": 7,
@@ -316,7 +315,8 @@
 									}
 								]
 							}
-						}
+						},
+						"modifiers": []
 					}
 				],
 				"fragment": {

packages/svelte/tsconfig.json

@@ -15,7 +15,6 @@
 		"allowJs": true,
 		"checkJs": true,
 		"paths": {
-			"acorn-typescript": ["./src/compiler/phases/1-parse/ambient.d.ts"],
 			"svelte": ["./src/index.d.ts"],
 			"svelte/action": ["./src/action/public.d.ts"],
 			"svelte/compiler": ["./src/compiler/public.d.ts"],