work around acorn-typescript quirks

Author: Rich-Harris

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

@@ -1,6 +1,7 @@
 import * as acorn from 'acorn';
 import { walk } from 'zimmerframe';
 import { tsPlugin } from 'acorn-typescript';
+import { locator } from '../../state.js';
 
 const ParserWithTS = acorn.Parser.extend(tsPlugin({ allowSatisfies: true }));
 
@@ -127,6 +128,16 @@ function amend(source, node) {
 			// @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) {
 				// i think there might be a bug in acorn-typescript that prevents
 				// `end` from being assigned when there's a type annotation

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

@@ -36,8 +36,7 @@
 							},
 							"end": {
 								"line": 3,
-								"column": 25,
-								"character": 54
+								"column": 25
 							}
 						},
 						"end": 46,

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

@@ -54,7 +54,10 @@
 											"line": 6,
 											"column": 12
 										},
-										"end": 87
+										"end": {
+											"line": 6,
+											"column": 25
+										}
 									},
 									"name": "e",
 									"typeAnnotation": {