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buffer: add @@toStringTag to Blob
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This commit adds the toStringTag to the Blob class to match
the behavior of Chrome and Firefox.

PR-URL: #37336
Backport-PR-URL: #39704
Fixes: #37337
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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cjihrig authored and MylesBorins committed Aug 31, 2021
1 parent f90b22d commit e7cf2ef
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Showing 2 changed files with 18 additions and 0 deletions.
7 changes: 7 additions & 0 deletions lib/internal/blob.js
Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,14 @@

const {
ArrayFrom,
ObjectDefineProperty,
ObjectSetPrototypeOf,
PromiseResolve,
RegExpPrototypeTest,
StringPrototypeToLowerCase,
Symbol,
SymbolIterator,
SymbolToStringTag,
Uint8Array,
} = primordials;

Expand Down Expand Up @@ -219,6 +221,11 @@ class Blob extends JSTransferable {
}
}

ObjectDefineProperty(Blob.prototype, SymbolToStringTag, {
configurable: true,
value: 'Blob',
});

InternalBlob.prototype.constructor = Blob;
ObjectSetPrototypeOf(
InternalBlob.prototype,
Expand Down
11 changes: 11 additions & 0 deletions test/parallel/test-blob.js
Original file line number Diff line number Diff line change
Expand Up @@ -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
});
}

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