From c73efcad7ea338064cda49ec793f01fdf9ac1135 Mon Sep 17 00:00:00 2001
From: Richie Bendall <richiebendall@gmail.com>
Date: Fri, 14 Feb 2020 20:37:28 +1300
Subject: [PATCH] Add optional `ReadableStream` polyfill (#12)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
---
 index.js     |  6 ++++++
 package.json |  8 +++++++-
 readme.md    | 22 ++++++++++++++++++++++
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 84a47a9..cb6099a 100644
--- a/index.js
+++ b/index.js
@@ -22,4 +22,10 @@ if (!global.AbortController) {
 	global.AbortController = AbortController;
 }
 
+if (!global.ReadableStream) {
+	try {
+		global.ReadableStream = require('web-streams-polyfill/ponyfill/es2018');
+	} catch (_) {}
+}
+
 module.exports = require('ky/umd');
diff --git a/package.json b/package.json
index 94eb65f..49f8355 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,13 @@
 		"xo": "^0.25.3"
 	},
 	"peerDependencies": {
-		"ky": ">=0.17.0"
+		"ky": ">=0.17.0",
+		"web-streams-polyfill": ">=2.0.0"
+	},
+	"peerDependenciesMeta": {
+		"web-streams-polyfill": {
+			"optional": true
+		}
 	},
 	"browser": "browser.js",
 	"ava": {
diff --git a/readme.md b/readme.md
index a8d9742..860d50e 100644
--- a/readme.md
+++ b/readme.md
@@ -35,6 +35,28 @@ const ky = require('ky-universal');
 })();
 ```
 
+## `ReadableStream` support
+
+For [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) support, also install [`web-streams-polyfill`](https://github.com/MattiasBuelens/web-streams-polyfill):
+
+```
+$ npm install web-streams-polyfill
+```
+
+You can then use it normally:
+
+```js
+const ky = require('ky-universal');
+
+(async () => {
+	const {body} = await ky('https://httpbin.org/bytes/16');
+	const {value} = await body.getReader().read();
+	const result = new TextDecoder('utf-8').decode(value);
+	
+	// …
+})();
+```
+
 ## API
 
 The API is exactly the same as the [Ky API](https://github.com/sindresorhus/ky#api).