diff --git a/packages/mermaid-layout-tidy-tree/src/non-layered-tidy-tree-layout.ts b/packages/mermaid-layout-tidy-tree/src/non-layered-tidy-tree-layout.d.ts
similarity index 100%
rename from packages/mermaid-layout-tidy-tree/src/non-layered-tidy-tree-layout.ts
rename to packages/mermaid-layout-tidy-tree/src/non-layered-tidy-tree-layout.d.ts
diff --git a/packages/mermaid-layout-tidy-tree/tsconfig.json b/packages/mermaid-layout-tidy-tree/tsconfig.json
index 0d701cede..6a0765629 100644
--- a/packages/mermaid-layout-tidy-tree/tsconfig.json
+++ b/packages/mermaid-layout-tidy-tree/tsconfig.json
@@ -5,6 +5,6 @@
     "outDir": "./dist",
     "types": ["vitest/importMeta", "vitest/globals"]
   },
-  "include": ["./src/**/*.ts"],
+"include": ["./src/**/.ts", "./src/**/*.d.ts"],
   "typeRoots": ["./src/types"]
 }
diff --git a/packages/mermaid/package.json b/packages/mermaid/package.json
index 9b888760c..7e4a2469a 100644
--- a/packages/mermaid/package.json
+++ b/packages/mermaid/package.json
@@ -83,7 +83,6 @@
     "khroma": "^2.1.0",
     "lodash-es": "^4.17.21",
     "marked": "^15.0.7",
-    "non-layered-tidy-tree-layout": "^2.0.2",
     "roughjs": "^4.6.6",
     "stylis": "^4.3.6",
     "ts-dedent": "^2.2.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d64bd1c0f..318cedabe 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -271,9 +271,6 @@ importers:
       marked:
         specifier: ^15.0.7
         version: 15.0.12
-      non-layered-tidy-tree-layout:
-        specifier: ^2.0.2
-        version: 2.0.2
       roughjs:
         specifier: ^4.6.6
         version: 4.6.6(patch_hash=3543d47108cb41b68ec6a671c0e1f9d0cfe2ce524fea5b0992511ae84c3c6b64)