diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a44aa95030f..4e08aa9b8ff 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -756,13 +756,13 @@ importers:
       '@cspell/cspell-bundled-dicts': workspace:*
       cspell-lib: workspace:*
       import-fresh: ^3.3.0
-      magic-string: ^0.27.0
+      magic-string: ^0.29.0
     dependencies:
       '@cspell/cspell-bundled-dicts': link:../../../packages/cspell-bundled-dicts
       import-fresh: 3.3.0
     devDependencies:
       cspell-lib: link:../../../packages/cspell-lib
-      magic-string: 0.27.0
+      magic-string: 0.29.0
 
   test-packages/cspell-lib/test-cspell-lib-webpack:
     specifiers:
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/package.json b/test-packages/cspell-lib/test-cspell-lib-rollup/package.json
index 41c266a1934..644bd5bd3c5 100644
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/package.json
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/package.json
@@ -11,7 +11,7 @@
   "scripts": {
     "clean": "shx rm -rf dist .tsbuildinfo",
     "build": "pnpm build:plugin && pnpm build:rollup",
-    "build:plugin": "tsc -p tsconfig.plugin.json",
+    "build:plugin": "tsc -p plugin/tsconfig.json",
     "build:rollup": "rollup -c rollup.config.mjs",
     "clean-build": "pnpm run clean && pnpm run build",
     "compile": "tsc -p .",
@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "cspell-lib": "workspace:*",
-    "magic-string": "^0.27.0"
+    "magic-string": "^0.29.0"
   },
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/index.mjs b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/index.mjs
new file mode 100644
index 00000000000..bbfeb2dd2e8
--- /dev/null
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/index.mjs
@@ -0,0 +1 @@
+export { injectDirname } from './dist/rollup-plugin-inject-dirname.mjs';
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.d.mts b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.d.mts
new file mode 100644
index 00000000000..950ab430336
--- /dev/null
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.d.mts
@@ -0,0 +1,8 @@
+export function injectSnippet(
+    code,
+    pos,
+    codeSnippet
+): {
+    code: string;
+    map: { mappings: string };
+};
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.mjs b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.mjs
new file mode 100644
index 00000000000..468e26c4361
--- /dev/null
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/inject.mjs
@@ -0,0 +1,17 @@
+// eslint-disable-next-line node/no-unpublished-import
+import MagicString from 'magic-string';
+
+export function injectSnippet(code, pos, codeSnippet) {
+    const ms = new MagicString(code);
+
+    const newCode = ms.appendLeft(pos, codeSnippet);
+
+    const map = newCode.generateMap();
+
+    return {
+        code: newCode.toString(),
+        map: {
+            mappings: map.mappings,
+        },
+    };
+}
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/rollup-plugin-inject-dirname.mts b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/src/rollup-plugin-inject-dirname.mts
similarity index 79%
rename from test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/rollup-plugin-inject-dirname.mts
rename to test-packages/cspell-lib/test-cspell-lib-rollup/plugin/src/rollup-plugin-inject-dirname.mts
index 9e2b2c8e817..77b0a41b844 100644
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/rollup-plugin-inject-dirname.mts
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/src/rollup-plugin-inject-dirname.mts
@@ -1,7 +1,7 @@
 /* eslint-disable node/no-extraneous-import */
 import type { Plugin } from 'rollup';
 
-import MagicString from './magic-string.mjs';
+import { injectSnippet } from '../inject.mjs';
 
 const codeSnippet = `\
 import {fileURLToPath as $$inject_fileURLToPath} from 'url';
@@ -10,7 +10,7 @@ const __filename = $$inject_fileURLToPath(import.meta.url);
 const __dirname = $$inject_dirname(__filename);
 `;
 
-export default function injectDirname(): Plugin {
+export function injectDirname(): Plugin {
     return {
         name: 'inject-dirname',
         renderChunk: {
@@ -21,8 +21,15 @@ export default function injectDirname(): Plugin {
 
                 const ms = inject(code);
                 if (!ms) return;
-                const sm = ms.generateMap();
-                return { code: ms.toString(), map: sm };
+                return {
+                    code: ms.code,
+                    map: {
+                        ...ms.map,
+                        names: [],
+                        sources: [],
+                        version: 1,
+                    },
+                };
             },
         },
         writeBundle: {
@@ -36,13 +43,11 @@ export default function injectDirname(): Plugin {
     };
 }
 
-function inject(code: string): MagicString | undefined {
+function inject(code: string) {
     const pos = calcPosition(code);
     if (pos === undefined) return undefined;
 
-    const ms = new MagicString(code);
-
-    return ms.appendLeft(pos, codeSnippet);
+    return injectSnippet(code, pos, codeSnippet);
 }
 
 function calcPosition(code: string): number | undefined {
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/tsconfig.json b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/tsconfig.json
new file mode 100644
index 00000000000..8b1dd36346f
--- /dev/null
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/plugin/tsconfig.json
@@ -0,0 +1,10 @@
+{
+    "extends": "../../../../tsconfig.esm.json",
+    "compilerOptions": {
+        "outDir": "dist",
+        "allowJs": true
+    },
+    "include": [
+        "src"
+    ]
+}
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/rollup.config.mjs b/test-packages/cspell-lib/test-cspell-lib-rollup/rollup.config.mjs
index c10501f88da..2c8f7d08712 100644
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/rollup.config.mjs
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/rollup.config.mjs
@@ -4,7 +4,7 @@ import rollupPluginTypescript from '@rollup/plugin-typescript';
 import rollupPluginJson from '@rollup/plugin-json';
 import rollupPluginCommonjs from '@rollup/plugin-commonjs';
 import { readFileSync } from 'fs';
-import injectDirname from './dist/plugin/rollup-plugin-inject-dirname.mjs';
+import { injectDirname } from './plugin/index.mjs';
 
 const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'));
 
@@ -67,7 +67,7 @@ const configs = [
         ...common,
         output: [
             { ...common.output, file: pkg.main, format: 'cjs' },
-            { ...common.output, file: pkg.module, format: 'es', globals: { MyGlobalValueJason: '$$filename_Jason$$' } },
+            { ...common.output, file: pkg.module, format: 'es' },
         ],
         plugins: getPlugins(),
     },
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/magic-string.mts b/test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/magic-string.mts
deleted file mode 100644
index 65c6501e5d0..00000000000
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/src/plugin/magic-string.mts
+++ /dev/null
@@ -1,19 +0,0 @@
-/* eslint-disable node/no-unpublished-import */
-/* eslint-disable @typescript-eslint/no-misused-new */
-import type { MagicStringOptions, SourceMap, SourceMapOptions } from 'magic-string';
-import MS from 'magic-string';
-
-export interface MagicString {
-    new (str: string, options?: MagicStringOptions): MagicString;
-    generateMap(options?: SourceMapOptions): SourceMap;
-    /**
-     * Appends the specified content at the index in the original string.
-     * If a range *ending* with index is subsequently moved, the insert will be moved with it.
-     * See also `s.prependLeft(...)`.
-     */
-    appendLeft(index: number, content: string): MagicString;
-    toString(): string;
-}
-export const MagicString = MS as unknown as MagicString;
-
-export default MagicString;
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.json b/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.json
index a9d9e8969a6..58604489b14 100644
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.json
+++ b/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.json
@@ -1,7 +1,8 @@
 {
     "extends": "../../../tsconfig.esm.json",
     "compilerOptions": {
-        "outDir": "dist"
+        "outDir": "dist",
+        "allowJs": true
     },
     "include": [
         "src"
diff --git a/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.plugin.json b/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.plugin.json
deleted file mode 100644
index 7ee748fc341..00000000000
--- a/test-packages/cspell-lib/test-cspell-lib-rollup/tsconfig.plugin.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-    "extends": "../../../tsconfig.esm.json",
-    "compilerOptions": {
-        "outDir": "dist/plugin"
-    },
-    "include": [
-        "src/plugin/*.mts"
-    ]
-}