Add typings for the existing connect-datadog package (#29439)

types/connect-datadog/connect-datadog-tests.ts

@@ -0,0 +1,16 @@
+import connectDD = require('connect-datadog');
+import dogstatsd = require('node-dogstatsd');
+
+// works with no options
+const middleware = connectDD({});
+
+// works with all options
+const middleware2 = connectDD({
+    stat: 'foo',
+    path: true,
+    method: true,
+    protocol: true,
+    response_code: true,
+    tags: ['abc', 'def'],
+    dogstatsd: new dogstatsd.StatsD('localhost'),
+});

types/connect-datadog/index.d.ts

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+// Type definitions for connect-datadog 0.0
+// Project: https://github.com/AppPress/node-connect-datadog
+// Definitions by: Moshe Good <https://github.com/moshegood>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+import express = require('express');
+import dogstatsd = require('node-dogstatsd');
+
+export = Factory;
+
+declare function Factory(options?: Factory.Options): express.RequestHandler;
+
+declare namespace Factory {
+    interface Options {
+        stat?: string;
+        tags?: string[];
+        path?: boolean;
+        method?: boolean;
+        protocol?: boolean;
+        response_code?: boolean;
+        dogstatsd?: dogstatsd.StatsD;
+    }
+}

types/connect-datadog/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "connect-datadog-tests.ts"
+    ]
+}

types/connect-datadog/tslint.json

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+{ "extends": "dtslint/dt.json" }