chore: remove arbitrum nova chain support

[0xApotheosis]

Description

Removes all Arbitrum Nova chain support from the codebase. The upstream unchained repo removed the Arbitrum Nova coinstack in shapeshift/unchained#1258 (merged 2026-02-09) as part of their Railway migration.

This is the follow-up to #11814 which made the minimal fix to unblock yarn generate.

Changes across 77 files (-1,945 lines):

• Remove arbitrumNova generator from openapitools.json, update cosmos/mayachain spec URLs to develop branch
• Remove unchained-client ArbitrumNova EVM module, parser, and tests
• Remove chain-adapters ArbitrumNovaChainAdapter and all type mappings
• Remove KnownChainIds.ArbitrumNovaMainnet from types package
• Remove CAIP constants (arbitrumNovaAssetId, arbitrumNovaChainId, etc.) and coingecko adapter mappings
• Remove utils package helpers (base assets, fee asset mapping, chain short name, etc.)
• Remove contracts package viem/ethers client entries
• Remove swapper/swap-widget ArbitrumNova filtering and chain config
• Remove public-api unchained URL mapping
• Remove ArbitrumNova feature flag, plugin, and config entries
• Remove CSP headers, wagmi/WalletConnect config, and all app-layer references
• Remove asset data generation scripts for ArbitrumNova
• Clean up all related tests and mocks

Issue (if applicable)

N/A — upstream removal in shapeshift/unchained#1258

Risk

Medium. This touches many files but is purely deletion of a chain that no longer has backend infrastructure. No new code is introduced.

Arbitrum Nova transaction handling, wallet support checks, and market data for eip155:42170 assets will no longer function. This is intentional since the unchained backend no longer exists.

Testing

Engineering

1. yarn workspace @shapeshiftoss/unchained-client generate — passes with all 18 generators succeeding
2. yarn type-check — no new type errors (only pre-existing TS6305 stale build artifact warnings)
3. Grep for arbitrumNova|ArbitrumNova|ARBITRUM_NOVA|arbitrum-nova across *.ts, *.tsx, *.json — zero matches

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Arbitrum Nova was already behind the ArbitrumNova feature flag (defaulting to false in production), so this removal has no user-facing impact.

Summary by CodeRabbit

• Refactor

  • Removed Arbitrum Nova network support across the app, simplifying available networks and adapters.

• Chores

  • Cleared Arbitrum Nova environment variables and feature-flag wiring.

• Tests

  • Removed Arbitrum Nova test suites, mocks, and related test data.

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📝 Walkthrough

Walkthrough

Removed Arbitrum Nova support across the codebase: environment vars, feature flags, type entries, chain adapters, unchained/viem clients, asset data, plugin registration, tests, and UI/wagmi configurations.

Changes

Cohort / File(s)	Summary
Environment & Env Types .env, .env.development, .env.test, src/vite-env.d.ts, src/config.ts	Deleted Arbitrum Nova env vars and feature flag declarations and validators.
Types & Constants packages/types/src/base.ts, packages/caip/src/constants.ts, src/constants/chains.ts, src/lib/getTxLink.ts, packages/utils/src/chainIdToFeeAssetId.ts	Removed KnownChainIds.ArbitrumNovaMainnet, related CAIP constants (assetId/chainId), fee-asset and short-name mappings.
Chain Adapters & EVM infra packages/chain-adapters/src/evm/EvmBaseAdapter.ts, packages/chain-adapters/src/evm/...arbitrumNova/*, packages/chain-adapters/src/evm/index.ts, packages/chain-adapters/src/types.ts	Deleted Arbitrum Nova adapter, tests, exports, and removed case handling/support checks across evm adapters/types.
Unchained Client & Parser packages/unchained-client/src/evm/arbitrumNova/..., packages/unchained-client/openapitools.json, packages/unchained-client/src/evm/index.ts, packages/unchained-client/src/index.ts	Removed generated/un-chained Arbitrum Nova client, parser class, tests, mock data, and OpenAPI generator entry; removed public exports.
Viem / RPC / Contracts packages/contracts/src/viemClient.ts, packages/contracts/src/ethersProviderSingleton.ts, src/context/WalletProvider/WalletConnectV2/config.ts	Removed viem Arbitrum Nova client, RPC/network mappings, and WalletConnect RPC entry and optional chain.
Asset Data & Coingecko packages/caip/src/adapters/coingecko/*, packages/caip/src/adapters/coingecko/utils.ts, src/lib/coingecko/utils.ts, scripts/generateAssetData/*, packages/utils/src/assetData/*	Removed Arbitrum Nova platform mappings, asset fetcher, base asset, coingecko supported chain inclusion, and related-index/color-map references.
Swap / Wagmi / UI packages/swap-widget/src/..., src/lib/wagmi-config.ts, src/pages/Markets/components/MarketsRow.tsx, packages/public-api/src/swapperDeps.ts	Excluded arbitrumNova from EVM network lists, SUPPORTED_CHAINS, base-asset maps, wagmi chain list, and unchained URL/fee-asset mappings.
App State, Feature Flags & Plugins src/state/slices/preferencesSlice/preferencesSlice.ts, src/context/PluginProvider/PluginProvider.tsx, src/plugins/arbitrumNova/index.ts, src/plugins/activePlugins.ts	Removed ArbitrumNova feature flag from state, removed feature-flag gating and removed plugin registration and active plugin entry.
Wallet / Account / Support Checks src/hooks/useWalletSupportsChain/useWalletSupportsChain.ts, src/lib/account/evm.ts, src/state/slices/portfolioSlice/utils/index.ts, src/lib/asset-service/service/AssetService.ts	Removed Arbitrum Nova-specific wallet support checks, derivation paths, account/label handling, and asset filtering guard.
Swapper Utilities & Filters packages/swapper/src/swappers/utils/filterBuyAssetsBySellAssetId/...	Removed special-case exclusion for Arbitrum Nova in buy-asset filtering; simplified EVM predicate logic.
Tests & Mocks packages/caip/src/adapters/coingecko/index.test.ts, packages/unchained-client/src/evm/arbitrumNova/parser/__tests__/*, src/test/mocks/*, src/components/.../useFormSend.test.tsx, src/lib/market-service/coingecko/coingecko.test.ts, src/state/slices/portfolioSlice/utils/index.test.ts	Deleted Arbitrum Nova test suites, mock data, and adjusted tests/mocks to remove Nova expectations.
CSP & Headers headers/csps/chains/arbitrumNova.ts, headers/csps/index.ts	Removed Arbitrum Nova CSP module and its registration entry.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

• fix: asset chain selector enabled for new supported chains #11482 — touches portfolioSlice utils where Arbitrum Nova handling was removed (related changes to isAssetSupportedByWallet).
• fix: missing plasma flag filter #11361 — modifies PluginProvider supported-chains gating logic (overlaps feature-flag gating adjustments).
• fix: migrate on chain suffix generation at runtime #10419 — updates asset-generation scripts (overlaps removal from scripts/generateAssetData).

Suggested labels

high risk

Poem

🐰 I hopped through code with nimble paws,
Nova leaves the tree without a cause,
Flags and chains now swept away,
Tests and maps have had their day,
Forward we go—lighter paths to cross. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: remove arbitrum nova chain support' clearly and specifically summarizes the main change: removal of Arbitrum Nova support across the codebase, which aligns with the extensive deletions throughout 77 modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/remove-arbitrum-nova-update-unchained-urls

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[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

src/lib/market-service/coingecko/coingecko.test.ts (1)

169-197: ⚠️ Potential issue | 🔴 Critical

Test count assertions not updated after Arbitrum Nova removal.

Line 224 destructures 5 keys (1 BTC + 4 ETH), confirming ethereum now maps to 4 asset IDs. But:

• Line 172 still expects 6 (should be 5)
• Line 196 still expects 5 (should be 4)

These tests will fail.

Proposed fix

     it('can flatten multiple responses', async () => {
       mocks.get.mockResolvedValueOnce({ data: [eth] }).mockResolvedValue({ data: [btc] })
       const result = await coinGeckoMarketService.findAll()
-      expect(Object.keys(result).length).toEqual(6)
+      expect(Object.keys(result).length).toEqual(5)
     })

     it('can return some results if partially rate limited', async () => {
       mocks.get.mockResolvedValueOnce({ status: 429 }).mockResolvedValue({ data: [eth] })
       const result = await coinGeckoMarketService.findAll()
-      expect(Object.keys(result).length).toEqual(5)
+      expect(Object.keys(result).length).toEqual(4)
     })

[premiumjibles]

Thorough and works well 👌 . Confirmed build works and did my own analysis to check and make sure all arbitrum nova stuff has been ripped out