From d573bead367883ce7258861fafcc441ca8df964d Mon Sep 17 00:00:00 2001
From: cjihrig <cjihrig@gmail.com>
Date: Fri, 12 Feb 2021 17:27:06 -0500
Subject: [PATCH] buffer: add @@toStringTag to Blob

This commit adds the toStringTag to the Blob class to match
the behavior of Chrome and Firefox.

PR-URL: https://github.com/nodejs/node/pull/37336
Backport-PR-URL: https://github.com/nodejs/node/pull/39704
Fixes: https://github.com/nodejs/node/issues/37337
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 lib/internal/blob.js       |  7 +++++++
 test/parallel/test-blob.js | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/lib/internal/blob.js b/lib/internal/blob.js
index accfdf9539c1d2..9b60171e65aef0 100644
--- a/lib/internal/blob.js
+++ b/lib/internal/blob.js
@@ -2,12 +2,14 @@
 
 const {
   ArrayFrom,
+  ObjectDefineProperty,
   ObjectSetPrototypeOf,
   PromiseResolve,
   RegExpPrototypeTest,
   StringPrototypeToLowerCase,
   Symbol,
   SymbolIterator,
+  SymbolToStringTag,
   Uint8Array,
 } = primordials;
 
@@ -219,6 +221,11 @@ class Blob extends JSTransferable {
   }
 }
 
+ObjectDefineProperty(Blob.prototype, SymbolToStringTag, {
+  configurable: true,
+  value: 'Blob',
+});
+
 InternalBlob.prototype.constructor = Blob;
 ObjectSetPrototypeOf(
   InternalBlob.prototype,
diff --git a/test/parallel/test-blob.js b/test/parallel/test-blob.js
index b32cacdda723a9..eef9d3dbd1e1d4 100644
--- a/test/parallel/test-blob.js
+++ b/test/parallel/test-blob.js
@@ -185,3 +185,14 @@ assert.throws(() => new Blob(['test', 1]), {
   const b = new Blob(['hello'], { type: '\x01' });
   assert.strictEqual(b.type, '');
 }
+
+{
+  const descriptor =
+      Object.getOwnPropertyDescriptor(Blob.prototype, Symbol.toStringTag);
+  assert.deepStrictEqual(descriptor, {
+    configurable: true,
+    enumerable: false,
+    value: 'Blob',
+    writable: false
+  });
+}