From 6beb925f0baabc5abba0397d372932055b8fb459 Mon Sep 17 00:00:00 2001
From: Yury Delendik <ydelendik@mozilla.com>
Date: Thu, 3 Aug 2017 08:48:51 -0500
Subject: [PATCH] Checks Edge support for streams.
---
src/shared/streams_polyfill.js | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/src/shared/streams_polyfill.js b/src/shared/streams_polyfill.js
index 5e3ce9050..e35da6cd9 100644
--- a/src/shared/streams_polyfill.js
+++ b/src/shared/streams_polyfill.js
@@ -13,7 +13,22 @@
* limitations under the License.
*/
+let isReadableStreamSupported = false;
if (typeof ReadableStream !== 'undefined') {
+ // MS Edge may say it has ReadableStream but they are not up to spec yet.
+ try {
+ // eslint-disable-next-line no-new
+ new ReadableStream({
+ start(controller) {
+ controller.close();
+ },
+ });
+ isReadableStreamSupported = true;
+ } catch (e) {
+ // The ReadableStream constructor cannot be used.
+ }
+}
+if (isReadableStreamSupported) {
exports.ReadableStream = ReadableStream;
} else {
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME')) {