diff --git a/.travis.yml b/.travis.yml
index a876834..226a240 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,11 @@ sudo: false
 os:
   - linux
   - osx
+  - windows
 language: node_js
 node_js:
-  - node
+  - '14'
+  - '12'
   - '10'
   - '8'
   - '6'
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..18ca19f
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,3 @@
+declare function getBashPath(paths?: string[]): string | null
+
+export = getBashPath
diff --git a/package.json b/package.json
index e532b27..cebb8f5 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   },
   "devDependencies": {
     "gulp-format-md": "^2.0.0",
-    "mocha": "^6.0.2"
+    "mocha": "^6.2.3"
   },
   "keywords": [
     "bash",