diff --git a/types/websequencediagrams/index.d.ts b/types/websequencediagrams/index.d.ts
new file mode 100644
index 0000000000..59dc8cebb6
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+++ b/types/websequencediagrams/index.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for websequencediagrams 0.1
+// Project: https://github.com/hildjj/node-websequencediagrams
+// Definitions by: Florian Keller <https://github.com/ffflorian>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+export type OutputType = 'png' | 'svg' | 'pdf';
+export type Style = 'default' | 'earth' | 'modern-blue' | 'mscgen' | 'omegapple' | 'qsd' | 'rose' | 'roundgreen' | 'napkin' | 'magazine' | 'vs2010' | 'patent';
+export type diagramCallback = (error: Error | null, buffer?: Buffer, mimeType?: string) => void;
+export type diagramUrlCallback = (error: Error | null, url?: string) => void;
+
+export const root: string;
+export const styles: Style[];
+
+export function diagram(description: string | Buffer, style: Style | null, format: OutputType | null, callback: diagramCallback): void;
+export function diagram_url(description: string | Buffer, style: Style | null, format: OutputType | null, callback: diagramUrlCallback): void;
diff --git a/types/websequencediagrams/tsconfig.json b/types/websequencediagrams/tsconfig.json
new file mode 100644
index 0000000000..d5a406dfe7
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+++ b/types/websequencediagrams/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "websequencediagrams-tests.ts"
+    ]
+}
diff --git a/types/websequencediagrams/tslint.json b/types/websequencediagrams/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
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+++ b/types/websequencediagrams/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }
diff --git a/types/websequencediagrams/websequencediagrams-tests.ts b/types/websequencediagrams/websequencediagrams-tests.ts
new file mode 100644
index 0000000000..34caa4dc19
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+++ b/types/websequencediagrams/websequencediagrams-tests.ts
@@ -0,0 +1,18 @@
+import * as wsd from 'websequencediagrams';
+
+wsd.diagram('Alice->Bob: message', 'modern-blue', 'png', (error, buffer, mimeType) => {
+  if (error) {
+    console.error(error);
+  } else {
+    console.log('Received MIME type:', mimeType);
+    console.log('Received Buffer:', buffer);
+  }
+});
+
+wsd.diagram_url('Alice->Bob: message', 'modern-blue', 'png', (error, url) => {
+  if (error) {
+    console.error(error);
+  } else {
+    console.log('Received URL:', url);
+  }
+});