diff --git a/types/isaac/index.d.ts b/types/isaac/index.d.ts
new file mode 100644
index 0000000000..57d7047b8e
--- /dev/null
+++ b/types/isaac/index.d.ts
@@ -0,0 +1,11 @@
+// Type definitions for isaac 0.0
+// Project: https://github.com/StefanoBalocco/isaac.js
+// Definitions by: Martin Olsson <https://github.com/mo>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function internals(): any;
+export function prng(n: number): void;
+export function rand(): number;
+export function random(): number;
+export function reset(): void;
+export function seed(s: string | number | ReadonlyArray<number>): void;
diff --git a/types/isaac/isaac-tests.ts b/types/isaac/isaac-tests.ts
new file mode 100644
index 0000000000..e6f624f8ec
--- /dev/null
+++ b/types/isaac/isaac-tests.ts
@@ -0,0 +1,8 @@
+import * as isaac from 'isaac';
+
+const r1 = isaac.random();
+const r2 = isaac.rand();
+isaac.reset();
+isaac.seed(42);
+const r3 = isaac.random();
+const r4 = isaac.rand();
diff --git a/types/isaac/tsconfig.json b/types/isaac/tsconfig.json
new file mode 100644
index 0000000000..14e814e3a3
--- /dev/null
+++ b/types/isaac/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",
+        "isaac-tests.ts"
+    ]
+}
diff --git a/types/isaac/tslint.json b/types/isaac/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/isaac/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }