diff --git a/types/browser-or-node/browser-or-node-tests.ts b/types/browser-or-node/browser-or-node-tests.ts
new file mode 100644
index 0000000000..bdf3f639f3
--- /dev/null
+++ b/types/browser-or-node/browser-or-node-tests.ts
@@ -0,0 +1,13 @@
+import { isBrowser, isWebWorker, isNode } from 'browser-or-node';
+
+if (isBrowser) {
+  console.log('isBrowser');
+}
+
+if (isWebWorker) {
+  console.log('isBrowser');
+}
+
+if (isNode) {
+  console.log('isBrowser');
+}
diff --git a/types/browser-or-node/index.d.ts b/types/browser-or-node/index.d.ts
new file mode 100644
index 0000000000..2dbe78490b
--- /dev/null
+++ b/types/browser-or-node/index.d.ts
@@ -0,0 +1,9 @@
+// Type definitions for browser-or-node 1.2
+// Project: https://github.com/flexdinesh/browser-or-node
+// Definitions by: Jussi Kinnula <https://github.com/jussikinnula>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+export const isBrowser: boolean;
+export const isWebWorker: boolean;
+export const isNode: boolean;
diff --git a/types/browser-or-node/tsconfig.json b/types/browser-or-node/tsconfig.json
new file mode 100644
index 0000000000..ffcb46571d
--- /dev/null
+++ b/types/browser-or-node/tsconfig.json
@@ -0,0 +1,24 @@
+{
+  "files": [
+    "index.d.ts",
+    "browser-or-node-tests.ts"
+  ],
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": [
+      "es6",
+      "dom"
+    ],
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "strictFunctionTypes": true,
+    "baseUrl": "../",
+    "typeRoots": [
+      "../"
+    ],
+    "types": [],
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true
+  }
+}
diff --git a/types/browser-or-node/tslint.json b/types/browser-or-node/tslint.json
new file mode 100644
index 0000000000..b4b47a0378
--- /dev/null
+++ b/types/browser-or-node/tslint.json
@@ -0,0 +1,3 @@
+{
+	"extends": "dtslint/dt.json"
+}