diff --git a/global.d.ts b/global.d.ts
new file mode 100644
index 00000000..44cebfe2
--- /dev/null
+++ b/global.d.ts
@@ -0,0 +1,7 @@
+// This file is required for the use of process.browser, which is
+// not defined in @types/node but a property added by browserify.
+declare namespace NodeJS {
+  interface Process {
+    browser: boolean;
+  }
+}
diff --git a/package.json b/package.json
index 31fc0e0c..c7776b27 100644
--- a/package.json
+++ b/package.json
@@ -35,16 +35,20 @@
     "xtend": "~4.0.0"
   },
   "devDependencies": {
+    "@types/node": "^9.3.0",
     "rimraf": "^2.6.1",
     "sinon": "^4.0.0",
     "standard": "^10.0.3",
-    "tape": "^4.7.0"
+    "tape": "^4.7.0",
+    "ts-node": "^4.1.0",
+    "typescript": "^2.6.2"
   },
   "browser": {
     "rimraf": false
   },
   "scripts": {
-    "test": "standard && node test.js"
+    "test": "standard && node test.js && npm run test-ts",
+    "test-ts": "ts-node --type-check --no-cache test.js"
   },
   "license": "MIT",
   "engines": {
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..4af83144
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "target": "es2015",
+    "moduleResolution": "node",
+    "checkJs": true,
+    "allowJs": true
+  }
+}