diff --git a/types/exenv/exenv-tests.ts b/types/exenv/exenv-tests.ts
new file mode 100644
index 0000000000..d13633b4a6
--- /dev/null
+++ b/types/exenv/exenv-tests.ts
@@ -0,0 +1,6 @@
+import * as ExecutionEnvironment from 'exenv';
+
+JSON.stringify(ExecutionEnvironment.canUseDOM);
+JSON.stringify(ExecutionEnvironment.canUseEventListeners);
+JSON.stringify(ExecutionEnvironment.canUseViewport);
+JSON.stringify(ExecutionEnvironment.canUseWorkers);
diff --git a/types/exenv/index.d.ts b/types/exenv/index.d.ts
new file mode 100644
index 0000000000..701494f6d8
--- /dev/null
+++ b/types/exenv/index.d.ts
@@ -0,0 +1,10 @@
+// Type definitions for exenv 1.2
+// Project: https://github.com/JedWatson/exenv
+// Definitions by: Christian Chown <https://github.com/christianchown>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+export const canUseDOM: boolean;
+export const canUseEventListeners: boolean;
+export const canUseViewport: boolean;
+export const canUseWorkers: boolean;
diff --git a/types/exenv/tsconfig.json b/types/exenv/tsconfig.json
new file mode 100644
index 0000000000..d8825637a1
--- /dev/null
+++ b/types/exenv/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "exenv-tests.ts"
+    ]
+}
\ No newline at end of file
diff --git a/types/exenv/tslint.json b/types/exenv/tslint.json
new file mode 100644
index 0000000000..2750cc0197
--- /dev/null
+++ b/types/exenv/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }
\ No newline at end of file