Notes #

• First 0.1.0 release of this package.

Features #

Initial scaffold for 18 core packages forming the foundation and middle layers of

the Solana Kit dependency graph. Each package has its pubspec.yaml with correct workspace dependencies, shared analysis_options.yaml, and an empty barrel export file ready for implementation.

Package groups scaffolded:

• Crypto & Identity: addresses (base58), keys (Ed25519), signers (interfaces)
• Codecs: core interfaces, numbers, strings, data structures, umbrella re-export
• Utilities: functional (pipe/compose), options (Rust-like Option codec), fast_stable_stringify, subscribable (reactive patterns)
• Transaction Building: instructions, instruction_plans, transaction_messages, transactions (compilation & signing)
• Other: offchain_messages, test_matchers

Implement transaction messages package ported from @solana/transaction-messages.

solana_kit_transaction_messages (99 tests):

• TransactionMessage immutable class with TransactionVersion (legacy, v0), fee payer, lifetime constraint, and instruction management
• LifetimeConstraint sealed class with BlockhashLifetimeConstraint and DurableNonceLifetimeConstraint subtypes
• Transaction message creation, fee payer setting, and instruction append/prepend
• Blockhash lifetime: validation (isTransactionMessageWithBlockhashLifetime), assertion, and setter
• Durable nonce lifetime: validation, assertion, and setter with automatic AdvanceNonceAccount instruction management
• compileTransactionMessage: compiles high-level messages to wire-format CompiledTransactionMessage
• Account compilation with correct ordering (fee payer, writable signers, readonly signers, writable non-signers, readonly non-signers)
• Address lookup table compression (compressTransactionMessageUsingAddressLookupTables)
• Message decompilation (decompileTransactionMessage) to reconstruct from compiled format
• Full codec suite: transaction version, header (3-byte), instruction, address table lookup, and complete message encoder/decoder

solana_kit_instructions (patch):

• AccountLookupMeta now extends AccountMeta for type compatibility in instruction accounts lists