From edbb4de95dde261fa5540dc4425d82d74bfa8cef Mon Sep 17 00:00:00 2001
From: Madhukar Kedlaya <mkedlaya@outlook.com>
Date: Fri, 16 Jun 2017 10:21:58 -0700
Subject: [PATCH] Creating a separate interface for IncomingMessageHeaders in
 node/index.d.ts (#17157)

* Creating a separate interface for IncomingMessageHeaders

This allows for IncomingMessage.headers types to be extensible per project. Suppose a node service expects a fixed set of headers of certain type (say string), that service can specify custom IncomingMessageHeaders with more concrete types defined.
For example

```
interface IncomingMessageHeaders {
    "host": string;
    "set-cookie": string[]
}
```

* Changing IncomingMessageHeaders defn

This definition adds undefined in addition to string and string[].
---
 types/node/index.d.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 178a8920e1..580769b975 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -804,12 +804,15 @@ declare module "http" {
         end(str: string, encoding?: string, cb?: Function): void;
         end(data?: any, encoding?: string): void;
     }
+    export interface IncomingMessageHeaders {
+        [key: string]: string | string[] | undefined;
+    }
     export interface IncomingMessage extends stream.Readable {
         httpVersion: string;
         httpVersionMajor: number;
         httpVersionMinor: number;
         connection: net.Socket;
-        headers: { [key: string]: string | string[] };
+        headers: IncomingMessageHeaders;
         rawHeaders: string[];
         trailers: { [key: string]: string };
         rawTrailers: string[];