These docs are for v2.0.1. Click to read the latest docs for v3.0.2.

Flash Swap

Allows users to perform a flash swap. The underlying math is same as the swapAssets() function, but the function does not require a balance object for coin A or B to be presented to perform the swap.

You can refer to this guide for a full breakdown on how to use this method: https://bluefin-exchange.readme.io/docs/using-flash-swaps-on-bluefin