Add types for slack-winston (#18373)

types/slack-winston/index.d.ts

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+// Type definitions for slack-winston 0.0
+// Project: https://github.com/niftylettuce/slack-winston
+// Definitions by: Elliot Blackburn <https://github.com/BlueHatbRit>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as winston from 'winston';
+
+export interface SlackTransportOptions extends winston.WinstonModuleTransportOptions {
+  domain: string;
+  token: string;
+  webhook_url: string;
+  channel: string;
+
+  username?: string;
+  icon_emoji?: string;
+  message?: string;
+  queueDelay?: number;
+}
+
+export class Slack extends winston.Transport implements winston.TransportInstance {
+  constructor(options?: SlackTransportOptions);
+}

types/slack-winston/slack-winston-tests.ts

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+import { Slack, SlackTransportOptions } from 'slack-winston';
+
+const slackOptions: SlackTransportOptions = {
+  domain: "abc",
+  token: "abc",
+  webhook_url: "abc",
+  channel: "abc",
+  username: "abc",
+  icon_emoji: ":sparkles:",
+  level: 'alert',
+};
+
+const slackTransport = new Slack(slackOptions);

types/slack-winston/tsconfig.json

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

types/slack-winston/tslint.json

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