diff --git a/package.json b/package.json
index de507e6..61a4bb3 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,11 @@
   "description": "Compares two spectra using a tree similarity",
   "main": "lib/index.js",
   "module": "src/index.js",
+  "types": "tree-similarity.d.ts",
   "files": [
     "lib",
-    "src"
+    "src",
+    "tree-similarity.d.ts"
   ],
   "scripts": {
     "compile": "rollup -c",
@@ -40,7 +42,6 @@
   },
   "dependencies": {
     "binary-search": "^1.3.6",
-    "cheminfo-types": "^1.7.2",
-    "num-sort": "^3.0.0"
+    "cheminfo-types": "^1.7.2"
   }
 }
diff --git a/rollup.config.mjs b/rollup.config.mjs
index d1dd155..7b0ccfe 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -4,5 +4,5 @@ export default {
     format: 'cjs',
     file: 'lib/index.js'
   },
-  external: ['binary-search', 'num-sort']
+  external: ['binary-search']
 };
diff --git a/src/createTree.js b/src/createTree.js
index 2aae7f0..b0905cd 100644
--- a/src/createTree.js
+++ b/src/createTree.js
@@ -1,10 +1,9 @@
 import binarySearch from 'binary-search';
-import { numberSortAscending } from 'num-sort';
 
 /**
- * @typedef {import("../types").Tree} Tree
- * @typedef {import("../types").CreateTreeOptions} CreateTreeOptions
- * @typedef {import("../types").Spectrum} Spectrum
+ * @typedef {import("../tree-similarity").Tree} Tree
+ * @typedef {import("../tree-similarity").CreateTreeOptions} CreateTreeOptions
+ * @typedef {import("../tree-similarity").Spectrum} Spectrum
  */
 
 /**
@@ -31,7 +30,7 @@ function mainCreateTree(x, y, from, to, minWindow, threshold) {
   }
 
   // search first point
-  let start = binarySearch(x, from, numberSortAscending);
+  let start = binarySearch(x, from, (a, b) => a - b);
   if (start < 0) {
     start = ~start;
   }
diff --git a/src/treeSimilarity.js b/src/treeSimilarity.js
index 77cc03c..6deeb5c 100644
--- a/src/treeSimilarity.js
+++ b/src/treeSimilarity.js
@@ -1,6 +1,6 @@
 /**
- * @typedef {import("../types").Tree} Tree
- * @typedef {import("../types").TreeSimilarityOptions} TreeSimilarityOptions
+ * @typedef {import("../tree-similarity").Tree} Tree
+ * @typedef {import("../tree-similarity").TreeSimilarityOptions} TreeSimilarityOptions
  */
 /**
  * Similarity between two nodes
diff --git a/types.d.ts b/tree-similarity.d.ts
similarity index 100%
rename from types.d.ts
rename to tree-similarity.d.ts