fix(swap-widget): restore redirect-only chains in the asset selector

[kaladinlight]

Description

The redirect-only chain support added in #12435 shipped with its chains filtered out one layer upstream, so it has never actually been reachable for the six chains it was built for.

TokenSelectModal gates on isWidgetSupportedChainId and only narrows to executable chains when the redirect is off — that part is correct. But its input comes from useAssets, which filters through BASE_ASSETS_BY_CHAIN_ID in constants/chains.ts, and that map never gained the chains REDIRECT_ONLY_CHAIN_IDS introduced in types/index.ts. Assets were dropped before the redirect-aware filter ever saw them.

Zcash, Tron, Sui, TON, NEAR and Starknet were therefore unselectable, leaving the redirect reachable only for the cosmos chains. This adds their base assets so the modal's existing filter can do its job.

Issue (if applicable)

closes #

Risk

Low.

Purely additive — five new entries in a lookup map plus zcash, and no change to any existing entry, filter, or execution path. Everything downstream of the picker already handled these chains; they just never arrived. No on-chain transaction is introduced or modified: these chains are redirect-only by definition, and selecting one hands off to app.shapeshift.com rather than signing in the widget.

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

None. No swapper, signing, or broadcast code is touched.

Testing

Engineering

Run the widget and open the asset selector with the redirect enabled — Zcash, Tron, Sui, TON, NEAR and Starknet now appear and are selectable, and selecting one routes to the app redirect rather than the in-widget swap flow. With the redirect disabled they remain hidden, as before.

Verified locally by asserting the invariant directly: every chain in EVM_CHAIN_IDS, UTXO_CHAIN_IDS, COSMOS_CHAIN_IDS, OTHER_CHAIN_IDS and REDIRECT_ONLY_CHAIN_IDS resolves through both isSupportedChainId and getBaseAsset — 27/27 pass with this change. Reverting the six entries makes 5 of the 6 redirect chains fail on the isSupportedChainId line specifically, confirming that map is the layer that was eating them.

Operations

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

The redirect itself is already gated. With it on, confirm the six chains are offered in the asset picker and that picking one opens app.shapeshift.com with the swap pre-filled.

Screenshots (if applicable)

n/a

Summary by CodeRabbit

• New Features
  • Added support for Near, Starknet, Sui, Ton, Tron, and Zcash assets in the swap widget.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4b5855ce-7bef-469f-bc22-b4452f5eddf8

📥 Commits

Reviewing files that changed from the base of the PR and between c0d8cb5 and 6dfb524.

📒 Files selected for processing (1)

• packages/swap-widget/src/constants/chains.ts

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📝 Walkthrough

Walkthrough

The swap widget now imports and registers Near, Starknet, Sui, Ton, Tron, and Zcash in its base-asset chain mapping.

Changes

Swap Widget Chain Support

Layer / File(s)	Summary
Chain asset imports and lookup mapping packages/swap-widget/src/constants/chains.ts	The file imports six chain assets and registers them in BASE_ASSETS_BY_CHAIN_ID.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Mergeability Score: ⚪ Minimal · up to 6dfb5

The PR restores asset-selector visibility for six redirect-only chains without changing swap execution or transaction behavior. No actionable merge-blocking risk remains beyond normal checks and review.

Possibly related issues

• swap-widget: stop requesting rates for chains the API rejects as sell assets #12557 — Both changes extend swap widget support for Tron, Sui, TON, NEAR, and Starknet.

Possibly related PRs

• shapeshift/web#12432 — Adds the same six chains to supported-chain constants.
• shapeshift/web#12435 — Extends chain-support mappings in chains.ts.

Suggested reviewers: 0xapotheosis

Poem

A rabbit hops through chains anew,
With Near and Starknet in the queue.
Sui, Ton, Tron, and Zcash align,
In one neat mapping, row by line.
“The swap path grows!” the rabbit sings.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes restoring redirect-only chains in the swap widget asset selector, which matches the primary change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/swap-widget-redirect-chain-assets

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