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Monorepo implementing the Hifi fixed-rate, fixed-term lending protocol

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Unfortunately, the script I wrote last month is still failing in [certain](https://github.com/hifi-finance/hifi/issues/22#issuecomment-920760316) circumstances. I will switch back to running integration on all packages, regardless of what has been modified. I...

enhancement

These functions are tested as part of the integration tests for the trade functions, but we should go the extra mile and write unit tests for them.

enhancement
stale
package:amm

The `@actions/setup-node@v2` action is used in four jobs in the CI workflow, which causes the following error: > Unable to reserve cache with key node-cache-Linux-yarn-ed73988f6a7bd1a0270433a2d2ff89c15016643cf8f05a2fb87a270786528399, another job may be creating...

bug

We can do this once Waffle adds support for checking against a subset of args emitted in events.

enhancement
package:amm

That is, on [line 254](https://github.com/hifi-finance/hifi-amm/blob/2f53c72fbd4feed1ddcce0d6d40d6f6a9d1c0968/contracts/HifiPool.sol#L254) in `HifiPool`. This is not a priority because there isn't enough DAI or USDC in existence for a phantom overflow to be possible.

enhancement
package:amm

There are many number constants duplicated across the `YieldSpace` tests. We should use one of the following tools to enable shared snapshots in a declarative way: + [mocha-chai-jest-snapshot](https://github.com/mochiya98/mocha-chai-jest-snapshot) + [snap-shot-it](https://github.com/bahmutov/snap-shot-it)

enhancement
package:amm

See the [documentation](https://ethereum-waffle.readthedocs.io/en/latest/matchers.html#change-token-balance).

enhancement
package:protocol
package:flash-swap

Consider implementing a library for the `normalize` and the `denormalize` functions. See how I implemented them in the [amm](https://github.com/hifi-finance/hifi-amm/blob/c71807ab9f13ad8cce7536a0552a428f1255de03/contracts/HifiPool.sol#L310-L328).

enhancement
package:protocol

See the [Hardhat guide](https://hardhat.org/guides/mainnet-forking.html).

enhancement
package:protocol