fix bn imports

Author: spacedragon

package.json

@@ -6,7 +6,7 @@
   ],
   "type": "module",
   "dependencies": {
-    "@sentio/sdk": "^2.36.0-rc.16",
+    "@sentio/sdk": "^2.36.0-rc.17",
     "node-fetch": "^3.3.1"
   },
   "resolutions": {

projects/spark/src/processor.ts

@@ -17,11 +17,12 @@ OrderbookProcessor.bind({
 //   }
 // })
     .onLogTradeEvent(async (trade, ctx) => {
-        const vol = BigInt(trade.data.trade_price.toString()) * BigInt(trade.data.trade_size.toString())
+        
+        const vol = trade.data.trade_price.mul(trade.data.trade_size)
         ctx.eventLogger.emit('trade', {
           distinctId: ctx.transaction?.sender,
           ...trade,
-          vol: vol.scaleDown(2 * 10)
+          vol: BigInt(vol.scaleDown(2 * 10).toString())
         })
     })
     .onLogOrderChangeEvent(async (order, ctx) => {