Hifi Flash Swap has been merged into the Hifi Monorepo
You can find the latest version of the source code in the hifi-finance/hifi repository, where it will continue to be developed.
Please report any bugs to the Hifi Monorepo issue tracker.
The approach we used to merge this repository into a monorepo is described in this article.
An archive of the source code before the merge is available here.