Added typescript type declaration

package.json

@@ -8,6 +8,7 @@
   ],
   "license": "MIT",
   "repository": "pillarjs/router",
+  "types": "types/index.d.ts",
   "dependencies": {
     "array-flatten": "3.0.0",
     "debug": "2.6.9",

types/index.d.ts

@@ -0,0 +1,38 @@
+import { IncomingMessage, ServerResponse } from "http";
+
+type handler = (req:IncomingMessage, res:ServerResponse, next:Function) => void
+
+interface Router {
+    (req:IncomingMessage, res:ServerResponse, next:Function):Router
+    get(path:string|handler[]|handler, handlers?:handler|handler[], handler?:handler):Router
+    post(path:string|handler[]|handler, handlers?:handler|handler[], handler?:handler):Router
+    put(path:string|handler[]|handler, handlers?:handler|handler[], handler?:handler):Router
+    patch(path:string|handler[]|handler, handlers?:handler|handler[], handler?:handler):Router
+    delete(path:string|handler[]|handler, handlers?:handler|handler[], handler?:handler):Router
+    route(path:string):Router
+    all(handler:|handler[]):Router
+    use(path:string|handler[]|handler, handler:handler|handler[]):Router
+
+}
+interface RouterOptions {
+    /**
+     * Enable case sensitivity.
+     */
+    caseSensitive?: boolean | undefined;
+
+    /**
+     * Preserve the req.params values from the parent router.
+     * If the parent and the child have conflicting param names, the child’s value take precedence.
+     *
+     * @default false
+     * @since 4.5.0
+     */
+    mergeParams?: boolean | undefined;
+
+    /**
+     * Enable strict routing.
+     */
+    strict?: boolean | undefined;
+}
+declare function Router(options?:RouterOptions):Router
+export = Router

types/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "moduleResolution": "node",
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": false,
+        "strictNullChecks": false,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": ["node"],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "./index.d.ts",
+    ]
+}