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 subscribable package ported from @solana/subscribable.

solana_kit_subscribable (33 tests):

• DataPublisher interface with on(channelName, subscriber) returning unsubscribe function
• WritableDataPublisher concrete implementation with publish(channelName, data) for testing
• createStreamFromDataPublisher converting DataPublisher to Dart Stream<TData> with error channel support
• createAsyncIterableFromDataPublisher with AbortSignal support, message queuing, and pre-poll message dropping
• demultiplexDataPublisher splitting single channel into multiple typed channels with lazy subscription and reference counting
• Idempotent unsubscribe and proper cleanup on abort