Adding TypeScript support for "datadog-winston" (#37983)

* Added typings for datadog-winston

* Updated comments

* Fixing comments which will also kick the Git checks

* Apparently I can't have a PATCH in my version. I thought this was supposed to be the version of the JS package my types target

* Ahh I see now, it is the version of the JS package, just with PATCH omitted

* Updated library to use CommonJS style imports

* Formatting

* Fixing to not use a declare module

* Fixing whitespace

* Fixed typo

* Adding options into a namespace so it can be referenced by consumer

types/datadog-winston/datadog-winston-tests.ts

@@ -0,0 +1,12 @@
+import DatadogWinston = require("datadog-winston");
+
+const options: DatadogWinston.DatadogTransportOptions = {
+    apiKey: '<key>',
+    ddsource: 'node.js',
+    ddtags: 'key:value',
+    hostname: 'hostname',
+    level: 'error',
+    service: 'service',
+};
+
+const logger = new DatadogWinston(options);

types/datadog-winston/index.d.ts

@@ -0,0 +1,25 @@
+// Type definitions for datadog-winston 1.0
+// Project: https://github.com/itsfadnis/datadog-winston
+// Definitions by: Matt Hintzke <https://github.com/mhintzke13>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+import * as Transport from "winston-transport";
+
+declare namespace DatadogWinston {
+    interface DatadogTransportOptions extends Transport.TransportStreamOptions {
+        apiKey: string;
+        hostname?: string;
+        service?: string;
+        ddsource?: string;
+        ddtags?: string;
+    }
+}
+
+declare class DatadogWinston extends Transport {
+    constructor(options: DatadogWinston.DatadogTransportOptions);
+
+    log?(info: any, next: () => void): void;
+}
+
+export = DatadogWinston;

types/datadog-winston/package.json

@@ -0,0 +1,6 @@
+{
+    "private": true,
+    "dependencies": {
+        "winston-transport": "^4.3.0"
+    }
+}

types/datadog-winston/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",
+        "datadog-winston-tests.ts"
+    ]
+}

types/datadog-winston/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }