feat: near intents bch support

[gomesalexandre]

Description

Add BCH as a supported chain for NEAR Intents swapper.

Issue (if applicable)

Risk

Low - BCH uses existing UTXO infrastructure, and NEAR Intents API handles BCH addresses correctly.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

NEAR Intents swaps involving BCH.

Testing

Engineering

Test BCH swaps via NEAR Intents (BCH → X and X → BCH).

Operations

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

Screenshots (if applicable)

https://jam.dev/c/acff7864-7fda-45bb-89ff-59916677ee17

Summary by CodeRabbit

New Features

• Added Bitcoin Cash Mainnet support to the swapper functionality, enabling Bitcoin Cash transactions and expanding chain compatibility.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds Bitcoin Cash Mainnet support to the NearIntentsSwapper by extending the supported chain IDs and providing a mapping to its short name 'bch'. This enables Bitcoin Cash transactions within the NEAR Intents swapping framework.

Changes

Cohort / File(s)	Change Summary
Bitcoin Cash Mainnet Support packages/swapper/src/swappers/NearIntentsSwapper/types.ts	Added KnownChainIds.BitcoinCashMainnet to the nearIntentsSupportedChainIds union type and added corresponding mapping entry in chainIdToNearIntentsChain with short name 'bch'

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• #11298 — Modifies the same NearIntentsSwapper types file by adding chain ID entries to nearIntentsSupportedChainIds and chainIdToNearIntentsChain
• #11043 — Adds support for multiple chains (BSC, Polygon, Avalanche, Optimism) to the same types file using the same pattern as this PR

Suggested reviewers

• premiumjibles
• kaladinlight

Poem

🐰 Bitcoin Cash hops into our swapper's embrace,
With 'bch' mapped to its rightful place,
NEAR Intents now knows the way,
Two lines added, chains expand today! 🥕✨

🚥 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 'feat: near intents bch support' directly and concisely describes the main change: adding Bitcoin Cash (BCH) support to NEAR intents, which matches the file modifications and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat_near_bch

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between c34d534 and 118ef38.

📒 Files selected for processing (1)

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

🧰 Additional context used

📓 Path-based instructions (7)

**/*.{ts,tsx,js,jsx}

📄 CodeRabbit inference engine (CLAUDE.md)

**/*.{ts,tsx,js,jsx}: Never assume a library is available - always check imports/package.json first
Prefer composition over inheritance
Write self-documenting code with clear variable and function names
Keep functions small and focused on a single responsibility
Avoid deep nesting - use early returns instead
Prefer procedural and easy to understand code
Never expose, log, or commit secrets, API keys, or credentials
Validate all inputs, especially user inputs
Handle errors gracefully with meaningful messages
Don't silently catch and ignore exceptions
Log errors appropriately for debugging
Provide fallback behavior when possible
Use appropriate data structures for the task
Never add code comments unless explicitly requested
When modifying code, do not add comments that reference previous implementations or explain what changed. Comments should only describe the current logic and functionality.
Use meaningful names for branches, variables, and functions
Always run yarn lint --fix and yarn type-check after making changes
Avoid let variable assignments - prefer const with inline IIFE switch statements or extract to functions for conditional logic

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

**/*.{ts,tsx}

📄 CodeRabbit inference engine (CLAUDE.md)

**/*.{ts,tsx}: Avoid useEffect where practical - use it only when necessary and following best practices
Avoid 'any' types - use specific type annotations instead
For default values with user overrides, use computed values (useMemo) instead of useEffect - pattern: userSelected ?? smartDefault ?? fallback
When function parameters are unused due to interface requirements, refactor the interface or implementation to remove them rather than prefixing with underscore
Sanitize data before displaying to prevent XSS
Memoize aggressively - wrap component variables in useMemo and callbacks in useCallback where possible
For static JSX icon elements (e.g., <TbCopy />) that don't depend on state/props, define them as constants outside the component to avoid re-renders instead of using useMemo
Account for light/dark mode using useColorModeValue hook
Account for responsive mobile designs in all UI components
When applying styles, use the existing standards and conventions of the codebase
Use Chakra UI components and conventions
All copy/text must use translation keys - never hardcode strings
Use the translation hook: useTranslate() from react-polyglot
Use useFeatureFlag('FlagName') hook to access feature flag values in components
Prefer type over interface for type definitions
Use strict typing - avoid any
Use Nominal types for domain identifiers (e.g., WalletId, AccountId)
Import types from @shapeshiftoss/caip for chain/account/asset IDs
Use useAppSelector for Redux state
Use useAppDispatch for Redux actions
Memoize expensive computations with useMemo
Memoize callbacks with useCallback

**/*.{ts,tsx}: Use Result<T, E> pattern for error handling in swappers and APIs; ALWAYS use Ok() and Err() from @sniptt/monads; AVOID throwing within swapper API implementations
ALWAYS use custom error classes from @shapeshiftoss/errors with meaningful error codes for internationalization and relevant details in error objects
ALWAYS wrap async op...

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

**/swapper{s,}/**/*.{ts,tsx}

📄 CodeRabbit inference engine (.cursor/rules/error-handling.mdc)

ALWAYS use makeSwapErrorRight for swapper errors with TradeQuoteError enum for error codes and provide detailed error information

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

**/*.{js,jsx,ts,tsx}

📄 CodeRabbit inference engine (.cursor/rules/naming-conventions.mdc)

**/*.{js,jsx,ts,tsx}: Use camelCase for variables, functions, and methods with descriptive names that explain the purpose
Use verb prefixes for functions that perform actions (e.g., fetch, validate, execute, update, calculate)
Use UPPER_SNAKE_CASE for constants and configuration values with descriptive names
Use handle prefix for event handlers with descriptive names in camelCase
Use descriptive boolean variable names with is, has, can, should prefixes
Use named exports for components, functions, and utilities instead of default exports
Use descriptive import names and avoid renaming imports unless necessary
Avoid non-descriptive variable names like data, item, obj, and single-letter variable names except in loops
Avoid abbreviations in names unless they are widely understood
Avoid generic function names like fn, func, or callback

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

packages/swapper/**/*.ts

📄 CodeRabbit inference engine (.cursor/rules/swapper.mdc)

packages/swapper/**/*.ts: Use TypeScript with explicit types (e.g., SupportedChainIds) for all code in the Swapper system
Use camelCase for variable and function names in the Swapper system
Use PascalCase for types, interfaces, and enums in the Swapper system
Use kebab-case for filenames in the Swapper system

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

packages/swapper/src/swappers/**/*.ts

📄 CodeRabbit inference engine (.cursor/rules/swapper.mdc)

packages/swapper/src/swappers/**/*.ts: Adhere to the Swapper directory structure: each swapper resides in packages/swapper/src/swappers// with required files (SwapperName.ts, endpoints.ts, types.ts, utils/constants.ts, utils/helpers.ts)
Validate inputs and log errors for debugging in Swapper system implementations
Swapper files must be located in packages/swapper/src/swappers/ directory structure and not placed outside this location
Avoid side effects in swap logic; ensure swap methods are deterministic and stateless

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

packages/swapper/src/swappers/*/*.ts

📄 CodeRabbit inference engine (.cursor/rules/swapper.mdc)

packages/swapper/src/swappers/*/*.ts: All swappers must implement the Swapper interface from packages/swapper/src/types.ts
Implement filterAssetIdsBySellable method to filter assets by supported chain IDs in the sell property
Implement filterBuyAssetsBySellAssetId method to filter assets by supported chain IDs in the buy property
Reuse executeEvmTransaction utility for EVM-based swappers instead of implementing custom transaction execution

Files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

🧠 Learnings (8)

📓 Common learnings

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11170
File: patches/@shapeshiftoss+bitcoinjs-lib+7.0.0-shapeshift.0.patch:9-19
Timestamp: 2025-11-25T21:43:10.838Z
Learning: In shapeshift/web, gomesalexandre will not expand PR scope to fix latent bugs in unused API surface (like bitcoinjs-lib patch validation methods) when comprehensive testing proves the actual used code paths work correctly, preferring to avoid costly hdwallet/web verdaccio publish cycles and full regression testing for conceptual issues with zero runtime impact.

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/utils/constants.ts : Define supported chain IDs for each swapper in utils/constants.ts with both 'sell' and 'buy' properties following the pattern: SupportedChainIds type

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11016
File: packages/swapper/src/swappers/NearIntentsSwapper/swapperApi/getTradeQuote.ts:109-145
Timestamp: 2025-11-12T12:18:00.863Z
Learning: NEAR Intents swapper: The NEAR 1Click API does not provide gas limit estimation logic like other swappers (e.g., magic gasLimit fields). For ERC20 token swaps in getTradeQuote, accurate fee estimation requires token approval and sufficient balance; without these prerequisites, fees may display as 0 or use inaccurate native transfer estimates. This is a known limitation of the NEAR Intents integration.

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/*.ts : Implement filterBuyAssetsBySellAssetId method to filter assets by supported chain IDs in the buy property

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10206
File: src/config.ts:127-128
Timestamp: 2025-08-07T11:20:44.614Z
Learning: gomesalexandre prefers required environment variables without default values in the config file (src/config.ts). They want explicit configuration and fail-fast behavior when environment variables are missing, rather than having fallback defaults.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/components/modals/ContractInteractionBreakdown.tsx:0-0
Timestamp: 2025-09-13T16:45:18.813Z
Learning: gomesalexandre prefers aggressively deleting unused/obsolete code files ("ramboing") rather than fixing technical issues in code that won't be used, demonstrating his preference for keeping codebases clean and PR scope focused.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10458
File: src/plugins/walletConnectToDapps/types.ts:7-7
Timestamp: 2025-09-10T15:34:29.604Z
Learning: gomesalexandre is comfortable relying on transitive dependencies (like abitype through ethers/viem) rather than explicitly declaring them in package.json, preferring to avoid package.json bloat when the transitive dependency approach works reliably in practice.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10503
File: .env:56-56
Timestamp: 2025-09-16T13:17:02.938Z
Learning: gomesalexandre prefers to enable feature flags globally in the base .env file when the intent is to activate features everywhere, even when there are known issues like crashes, demonstrating his preference for intentional global feature rollouts over cautious per-environment enablement.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10249
File: src/pages/ThorChainLP/components/ReusableLpStatus/TransactionRow.tsx:447-503
Timestamp: 2025-08-13T17:07:10.763Z
Learning: gomesalexandre prefers relying on TypeScript's type system for validation rather than adding defensive runtime null checks when types are properly defined. They favor a TypeScript-first approach over defensive programming with runtime validations.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10276
File: src/hooks/useActionCenterSubscribers/useThorchainLpDepositActionSubscriber.tsx:61-66
Timestamp: 2025-08-14T17:51:47.556Z
Learning: gomesalexandre is not concerned about structured logging and prefers to keep console.error usage as-is rather than implementing structured logging patterns, even when project guidelines suggest otherwise.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10413
File: src/components/Modals/FiatRamps/fiatRampProviders/onramper/utils.ts:29-55
Timestamp: 2025-09-02T14:26:19.028Z
Learning: gomesalexandre prefers to keep preparatory/reference code simple until it's actively consumed, rather than implementing comprehensive error handling, validation, and robustness improvements upfront. They prefer to add these improvements when the code is actually being used in production.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10276
File: src/pages/ThorChainLP/components/ReusableLpStatus/TransactionRow.tsx:396-402
Timestamp: 2025-08-14T17:55:57.490Z
Learning: gomesalexandre is comfortable with functions/variables that return undefined or true (tri-state) when only the truthy case matters, preferring to rely on JavaScript's truthy/falsy behavior rather than explicitly returning boolean values.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10783
File: src/context/ModalStackProvider/useModalRegistration.ts:30-41
Timestamp: 2025-10-16T11:14:40.657Z
Learning: gomesalexandre prefers to add lint rules (like typescript-eslint/strict-boolean-expressions for truthiness checks on numbers) to catch common issues project-wide rather than relying on code review to catch them.

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10206
File: src/lib/moralis.ts:47-85
Timestamp: 2025-08-07T11:22:16.983Z
Learning: gomesalexandre prefers console.error over structured logging for Moralis API integration debugging, as they find it more conventional and prefer to examine XHR requests directly rather than rely on structured logs for troubleshooting.

📚 Learning: 2025-11-24T21:20:57.909Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/utils/constants.ts : Define supported chain IDs for each swapper in utils/constants.ts with both 'sell' and 'buy' properties following the pattern: SupportedChainIds type

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-11-24T21:20:57.909Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/**/*.ts : Use TypeScript with explicit types (e.g., SupportedChainIds) for all code in the Swapper system

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-11-24T21:20:57.909Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/*.ts : Implement filterBuyAssetsBySellAssetId method to filter assets by supported chain IDs in the buy property

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-11-24T21:20:57.909Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/*.ts : Implement filterAssetIdsBySellable method to filter assets by supported chain IDs in the sell property

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-11-24T21:20:04.979Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-11-24T21:20:04.979Z
Learning: Applies to **/*.{ts,tsx} : Import types from `shapeshiftoss/caip` for chain/account/asset IDs

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-10-23T14:27:19.073Z

Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10857
File: src/plugins/walletConnectToDapps/eventsManager/useWalletConnectEventsHandler.ts:101-104
Timestamp: 2025-10-23T14:27:19.073Z
Learning: In WalletConnect wallet_switchEthereumChain and wallet_addEthereumChain requests, the chainId parameter is always present as per the protocol spec. Type guards checking for missing chainId in these handlers (like `if (!evmNetworkIdHex) return`) are solely for TypeScript compiler satisfaction, not real runtime edge cases.

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

📚 Learning: 2025-11-24T21:20:57.909Z

Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/constants.ts : Register new swappers in packages/swapper/src/constants.ts with an entry in the swappers registry mapping SwapperName enum to swapper implementation

Applied to files:

• packages/swapper/src/swappers/NearIntentsSwapper/types.ts

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🔇 Additional comments (2)

packages/swapper/src/swappers/NearIntentsSwapper/types.ts (2)

18-20: LGTM — BCH added to supported chain list.

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41-43: LGTM — BCH short-code mapping added.

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