feat(arbitrum-adapter): scaffold @txkit/arbitrum-adapter (Buildathon Week 1)#18
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Skeleton package for the Arbitrum Open House London Buildathon Week 1 deliverable. Bridges Arbitrum specifics and the ERC-8265 PreparedTransaction Envelope via four additive `meta.arbitrum.*` sub-keys plus an Arbitrum-aware calldata decoder seed. Surface: - attach/extract/isBridgeIntent (canonical / Hop / Across / Stargate + open string) - attach/extract/isRetryableHints (l2Gas, l2GasPriceBid, maxSubmissionCost, refunds) - attach/extract/isSequencerFeePreview (L1 calldata + L2 compute split, Nova compression flag) - previewSequencerFee (stub; viem-driven precompile reads land in alpha.1) - decodeArbitrumCall + KNOWN_ARBITRUM_ADDRESSES (precompiles, Delayed Inbox, Hop / Across L1 entrypoints) 18 vitest tests pass. tsc --noEmit clean. tsup build: 4.86 KB ESM / 5.26 KB CJS / 9.98 KB DTS. Apache-2.0. Zero React or wagmi deps. Mirrors @txkit/x402-adapter and @txkit/ows-adapter structure.
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…ards - New `Publish @txkit/arbitrum-adapter` step before the @txkit/react step (the only consumer of the cohort with internal deps, kept last). - Each publish step now wraps `pnpm publish` in a `npm view ... >/dev/null 2>&1` check so cohort releases ship only the packages whose package.json version is not yet on the registry. A v* tag can add a new package without forcing a synchronized cohort bump for the seven existing ones (alpha.3 will stay alpha.3, arbitrum-adapter alpha.0 publishes cleanly). - Behaviour for the documented synchronized-cohort path is unchanged: bump everyone's version, tag v0.1.0-alpha.N, all eight publish.
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Summary
@txkit/arbitrum-adapterskeleton package for the Arbitrum Open House London Buildathon (Week 1 deliverable, originally due 2026-05-28).@txkit/x402-adapterand@txkit/ows-adapter: typed shape on aPreparedEnvelope.meta.arbitrumslot, zero React or wagmi deps, Apache-2.0.What's in the package
src/types.tsArbitrumChainId,L1ToL2BridgeIntent,L1ToL2BridgeProvider,RetryableTicketHints,SequencerFeePreview,ArbitrumMeta,EnvelopeWithArbitrum,ArbitrumDecodedCallsrc/bridge.tsattachBridgeIntent/extractBridgeIntent/isBridgeIntentsrc/retryable.tsattachRetryableHints/extractRetryableHints/isRetryableHintssrc/sequencer.tsattachSequencerFeePreview/extractSequencerFeePreview/isSequencerFeePreview/previewSequencerFee(stub) /NOVA_USES_COMPRESSED_CALLDATAsrc/decoder.tsdecodeArbitrumCall+KNOWN_ARBITRUM_ADDRESSESregistrysrc/__tests__/arbitrum.spec.tsSkeleton vs full implementation
previewSequencerFeenull)ArbGasInfo+NodeInterface.gasEstimateL1ComponentreadscreateRetryableTicket,ArbSys.sendTxToL1,ArbSys.withdrawEth)@txkit/tx-decoderVerification
Test plan
pnpm --filter @txkit/arbitrum-adapter typecheckgreenpnpm --filter @txkit/arbitrum-adapter test18/18 passpnpm --filter @txkit/arbitrum-adapter buildproduces ESM + CJS + DTSlicense: "Apache-2.0"in package.json@txkit/x402-adapterand@txkit/ows-adapterconventions)Out of scope (intentionally)
previewSequencerFeebody (viem dep would inflate alpha.0 footprint; deferred to alpha.1)@txkit/tx-decoder)size-limitconfig + addition to rootpnpm sizescript (alpha.0 not publish-bound, can land in alpha.1)Forum post draft (out-of-tree, Mike review)
Companion draft for the Builder's Block forum outreach lives at
~/WebstormProjects/claude/wiki/projects/txkit-erc-draft/buildathon-week1-forum-2026-05-29.md(~340 words, intentionally tighter than the 2026-05-28 ERC-composition draft; leads with this adapter as the artifact).Related
~/WebstormProjects/claude/wiki/projects/txkit-erc-draft/arbitrum-buildathon-strategy-2026-05-21.md