Can't import fetchLookupTables function

[BladeRunner713]

Overview

fetchLookupTables function not exported in file packages/library/src/decompile-transaction-message-fetching-lookup-tables.ts

Steps to reproduce

Description of bug

[mcintyre94]

Hmm fair point, it's currently just used as part of the implementation for decompileTransactionMessageFetchingLookupTables. But we do use its return type AddressesByLookupTableAddress throughout the library, so it could be useful in other places.

Could you give a rough idea of what you're looking to use it for? Just to make sure it's a sensible API and see if it could be exported as-is.

[BladeRunner713]

Hmm fair point, it's currently just used as part of the implementation for decompileTransactionMessageFetchingLookupTables. But we do use its return type AddressesByLookupTableAddress throughout the library, so it could be useful in other places.

Could you give a rough idea of what you're looking to use it for? Just to make sure it's a sensible API and see if it could be exported as-is.

I used Jupiter's API to get swap instructions https://station.jup.ag/docs/api/swap-instructions. The API returns a list of lookup table addresses (addressLookupTableAddresses) , and I need to fetch look up table on chain using these addresses. By using these lookup tables with compressTransactionMessageUsingAddressLookupTables, I could keep the transaction size under the limit. Not sure if there are other ways to achieve this. Of course I can have fetchLookupTables function locally, but it's better to have it in the SDK.

[mcintyre94]

Gotcha, we can definitely publish this, makes sense to bridge the gap between a list of lookup tables and that input to compress a transaction.

We should move it to its own file and add some unit tests, which can probably be loosely based on the existing ones for the decompress using lookup tables function.