diff --git a/semver-diff/index.d.ts b/semver-diff/index.d.ts
new file mode 100644
index 0000000000..550784e697
--- /dev/null
+++ b/semver-diff/index.d.ts
@@ -0,0 +1,12 @@
+// Type definitions for semver-diff 2.1
+// Project: https://github.com/sindresorhus/semver-diff
+// Definitions by: Chris Barr <https://github.com/chrismbarr>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/semver-diff
+
+declare namespace SemverDiff {
+    type SemverDiffReturn = 'major' | 'minor' | 'patch' | 'prerelease' | 'build' | null;
+}
+
+declare function SemverDiff(versionA: string, versionB: string): SemverDiff.SemverDiffReturn;
+
+export = SemverDiff;
\ No newline at end of file
diff --git a/semver-diff/semver-diff-tests.ts b/semver-diff/semver-diff-tests.ts
new file mode 100644
index 0000000000..fca7d8552e
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+++ b/semver-diff/semver-diff-tests.ts
@@ -0,0 +1,15 @@
+import semverDiff = require('semver-diff');
+
+semverDiff('1.1.1', '1.1.2'); //=> 'patch'
+
+semverDiff('0.0.1', '1.0.0'); //=> 'major'
+
+semverDiff('0.0.1', '0.1.0'); //=> 'minor'
+
+semverDiff('0.0.1-foo', '0.0.1-foo.bar'); //=> 'prerelease'
+
+semverDiff('0.1.0', '0.1.0+foo'); //=> 'build'
+
+semverDiff('0.0.1', '0.0.1'); //=> null
+
+semverDiff('0.0.2', '0.0.1'); //=> null 
diff --git a/semver-diff/tsconfig.json b/semver-diff/tsconfig.json
new file mode 100644
index 0000000000..33f2ad3018
--- /dev/null
+++ b/semver-diff/tsconfig.json
@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "semver-diff-tests.ts"
+    ]
+}
\ No newline at end of file
diff --git a/semver-diff/tslint.json b/semver-diff/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/semver-diff/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }