diff --git a/types/has-yarn/has-yarn-tests.ts b/types/has-yarn/has-yarn-tests.ts
new file mode 100644
index 0000000000..925cfe3c43
--- /dev/null
+++ b/types/has-yarn/has-yarn-tests.ts
@@ -0,0 +1,4 @@
+import hasYarn = require('has-yarn');
+
+// $ExpectType boolean
+hasYarn('foo');
diff --git a/types/has-yarn/index.d.ts b/types/has-yarn/index.d.ts
new file mode 100644
index 0000000000..378f1ee811
--- /dev/null
+++ b/types/has-yarn/index.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for has-yarn 1.0
+// Project: https://github.com/sindresorhus/has-yarn#readme
+// Definitions by: BendingBender <https://github.com/BendgingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = hasYarn;
+
+declare function hasYarn(cwd?: string): boolean;
diff --git a/types/has-yarn/tsconfig.json b/types/has-yarn/tsconfig.json
new file mode 100644
index 0000000000..824092017a
--- /dev/null
+++ b/types/has-yarn/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",
+        "has-yarn-tests.ts"
+    ]
+}
diff --git a/types/has-yarn/tslint.json b/types/has-yarn/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/has-yarn/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }