fix: fix sourcemap in svelte.js (#377)

package.json

@@ -103,6 +103,7 @@
     "jest-environment-jsdom": "^29.7.0",
     "lint-staged": "^15.1.0",
     "lodash-es": "^4.17.15",
+    "magic-string": "^0.30.5",
     "markdown-table": "^3.0.2",
     "markdown-toc": "^1.2.0",
     "npm-run-all": "^4.1.5",

rollup.config.js

@@ -1,3 +1,4 @@
+import MagicString from 'magic-string'
 import inject from '@rollup/plugin-inject'
 import cjs from '@rollup/plugin-commonjs'
 import resolve from '@rollup/plugin-node-resolve'
@@ -102,8 +103,13 @@ const entryPoints = [
       {
         name: 'svelte-v3-compat',
         transform (source) {
-          return source
-            .replaceAll('ensure_array_like(', 'ensure_array_like_shim(')
+          const magicString = new MagicString(source)
+          magicString.replaceAll('ensure_array_like(', 'ensure_array_like_shim(')
+
+          return {
+            code: magicString.toString(),
+            map: magicString.generateMap()
+          }
         }
       },
       inject({

yarn.lock

@@ -5469,7 +5469,7 @@ magic-string@^0.27.0:
   dependencies:
     "@jridgewell/sourcemap-codec" "^1.4.13"
 
-magic-string@^0.30.3, magic-string@^0.30.4:
+magic-string@^0.30.3, magic-string@^0.30.4, magic-string@^0.30.5:
   version "0.30.5"
   resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.30.5.tgz#1994d980bd1c8835dc6e78db7cbd4ae4f24746f9"
   integrity sha512-7xlpfBaQaP/T6Vh8MO/EqXSW5En6INHEvEXQiuff7Gku0PWjU3uf6w/j9o7O+SpB5fOAkrI5HeoNgwjEO0pFsA==