diff --git a/types/slack-winston/index.d.ts b/types/slack-winston/index.d.ts
index 91d3e4c5ce..eef4312287 100644
--- a/types/slack-winston/index.d.ts
+++ b/types/slack-winston/index.d.ts
@@ -4,9 +4,7 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
-import Transport = require("winston-transport");
-
-export interface SlackTransportOptions extends Transport.TransportStreamOptions {
+export interface SlackTransportOptions {
   domain: string;
   token: string;
   webhook_url: string;
@@ -16,8 +14,39 @@ export interface SlackTransportOptions extends Transport.TransportStreamOptions
   icon_emoji?: string;
   message?: string;
   queueDelay?: number;
+
+  // from winston-transport TransportStreamOptions
+  format?: Format;
+  level?: string;
+  silent?: boolean;
+  handleExceptions?: boolean;
+
+  log?(info: any, next: () => void): any;
+  logv?(info: any, next: () => void): any;
+  close?(): void;
 }
 
-export class Slack extends Transport {
+export class Slack {
   constructor(options?: SlackTransportOptions);
+  format?: Format;
+  level?: string;
+  silent?: boolean;
+  handleExceptions?: boolean;
+
+  log?(info: any, next: () => void): any;
+  logv?(info: any, next: () => void): any;
+  close?(): void;
+}
+
+export class Format {
+  constructor(opts?: object);
+
+  options?: object;
+  transform: (info: TransformableInfo, opts?: any) => TransformableInfo | boolean;
+}
+
+export interface TransformableInfo {
+  level: string;
+  message: string;
+  [key: string]: any;
 }
diff --git a/types/slack-winston/package.json b/types/slack-winston/package.json
deleted file mode 100644
index 33e1a4f018..0000000000
--- a/types/slack-winston/package.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "private": true,
-    "dependencies": {
-        "@types/winston": "^2.3.9"
-    }
-}