fix(NODE-6608): calculateObjectSize returns the wrong value for bigint

mongodb · Dec 16, 2024 · 3f22a32 · 3f22a32
1 parent 26549d9
commit 3f22a32
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diff --git a/src/parser/calculate_size.ts b/src/parser/calculate_size.ts
@@ -205,6 +205,9 @@ function calculateElement(
           1
         );
       }
+      return 0;
+    case 'bigint':
+      return (name != null ? ByteUtils.utf8ByteLength(name) + 1 : 0) + (8 + 1);
   }
 
   return 0;

diff --git a/test/node/parser/calculate_size.test.ts b/test/node/parser/calculate_size.test.ts
@@ -24,4 +24,10 @@ describe('calculateSize()', () => {
       })
     ).to.throw(BSONVersionError, /Unsupported BSON version/i);
   });
+
+  it('returns the correct size for a bigint value', function () {
+    const doc = { a: BigInt(1) };
+    expect(BSON.calculateObjectSize(doc)).to.equal(16);
+    expect(BSON.calculateObjectSize(doc)).to.equal(BSON.serialize(doc).byteLength);
+  });
 });