fix: prevent TypeError in PreparedStatement.execute() when streaming without callback

lib/base/prepared-statement.js

@@ -356,11 +356,10 @@ class PreparedStatement extends EventEmitter {
       }
     }
 
-    req.execute('sp_execute', (err, result) => {
-      if (err) return callback(err)
-
-      callback(null, result)
-    })
+    req.execute('sp_execute', typeof callback === 'function'
+      ? callback
+      : () => {}
+    )
 
     return req
   }

test/common/unit.js

@@ -1401,5 +1401,22 @@ describe('connection string auth - tedious', () => {
         assert.strictEqual(ps.overrides.requestTimeout, undefined)
       })
     })
+
+    describe('PreparedStatement streaming', () => {
+      it('execute does not throw when stream=true and no callback provided', (done) => {
+        const pool = new ConnectionPool({ server: 'localhost' })
+        const ps = new BasePreparedStatement(pool)
+        ps.stream = true
+        ps.prepared = true
+        ps._handle = 1
+
+        // Should not throw TypeError — returns the inner Request
+        const req = ps.execute({})
+        assert.ok(req, 'execute() should return the inner Request')
+        // The request will error (no connection) — that's fine,
+        // the point is it doesn't throw TypeError
+        req.on('error', () => done())
+      })
+    })
   })
 })