From 7cde134a4c5e1ec005f85768a11533a28b95bca3 Mon Sep 17 00:00:00 2001
From: keroxp <kerokerokerop@gmail.com>
Date: Sat, 2 Feb 2019 22:09:42 +0900
Subject: [PATCH] fix: ReadaeblStream#cancel type

---
 readable_stream_reader.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/readable_stream_reader.ts b/readable_stream_reader.ts
index afa6392..63ab4be 100644
--- a/readable_stream_reader.ts
+++ b/readable_stream_reader.ts
@@ -14,7 +14,7 @@ import { ReadableStreamBYOBReader } from "./readable_stream_byob_reader.ts";
 export interface ReadableStreamReader<T = any> {
   readonly closed: Promise<any>;
 
-  cancel(reason): Promise<any>;
+  cancel(reason?): Promise<void>;
 
   read(view?: ArrayBufferView): Promise<ReadableStreamReadResult<T>>;
 
@@ -46,7 +46,7 @@ export class ReadableStreamDefaultReader<T = any>
   closedPromise: Defer<undefined>;
   ownerReadableStream: ReadableStream;
 
-  cancel(reason): Promise<undefined> {
+  cancel(reason?): Promise<void> {
     if (!IsReadableStreamDefaultReader(this)) {
       return Promise.reject(new TypeError());
     }