feat(trade): user slippage control with per-chain persistence - #30
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TradePanel hardcoded 1% slippage: too tight on fresh launches (avoidable reverts) with no override. Add 0.5/1/3% presets plus custom 0.1-20% input, persisted per chain, wired into minOut and Minimum received. Default stays 1% so existing behavior is unchanged unless the user picks otherwise. New pure module trade-slippage.ts (presets, parse/clamp/format, external- store with server snapshot so hydration never mismatches) with 7 unit tests.
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Limit details: You’ve used the included review currently available. 📝 WalkthroughWalkthroughTrade slippage is configurable per chain. Values from 0.1% to 20% are validated and persisted. The selected value updates minimum-received calculations and transaction parameters. ChangesTrade slippage configuration
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Trader
participant TradePanel
participant trade_slippage
participant localStorage
Trader->>TradePanel: Select preset or enter custom slippage
TradePanel->>trade_slippage: Parse and set slippage
trade_slippage->>localStorage: Save chain-specific value
trade_slippage-->>TradePanel: Notify updated snapshot
TradePanel-->>Trader: Display slippage and minimum received
TradePanel->>trade_slippage: Read selected slippage for transaction
Merge Risk: ⚪ Minimal · up to The configurable slippage setting remains consistent between the selected chain, displayed minimum received amount, and submitted transaction parameters. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@app/src/lib/launchpad/trade-slippage.ts`:
- Around line 34-35: Update parseSlippageInput so percentage values below 0.1%
are rejected and return null before clampSlippageBps is called, while preserving
existing handling for valid values and upper-bound checks.
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app/src/components/launchpad/TradePanel.tsxapp/src/lib/launchpad/trade-slippage.test.tsapp/src/lib/launchpad/trade-slippage.ts
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…deRabbit, PR Gitlawb#30) parseSlippageInput("0.01") passed validation then clamped to 10bps, silently changing the selection to 0.1%. Reject anything below SLIPPAGE_MIN_BPS so the field keeps the previous value and shows the 0.1-20% hint.
Vasanthdev2004
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Adjustable slippage is useful, and the selected value reaches the transaction's minimum output correctly. Two UI integration issues need fixing: the custom field can silently multiply the intended tolerance, and the error message still reports 1% regardless of what the trade used.
All 7 new helper tests pass. I reproduced both issues by executing the component handlers and helpers with mocked hooks/wallet calls; no funded transaction was sent.
| className="h-7 w-16 rounded-md border border-line bg-transparent px-1.5 pr-5 text-right font-mono text-[11px] text-ink tnum outline-offset-2 placeholder:text-faint disabled:opacity-40" | ||
| value={slippageInput ?? String(slippageBps / 100)} | ||
| onChange={(e) => { | ||
| const raw = e.target.value.replace(/[^0-9.%]/g, ""); |
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[P2] Validate the input before removing characters. Entering or pasting 0,5 becomes 05 here, so the parser accepts and persists 5% slippage rather than 0.5%; -3 likewise becomes valid 3. This is especially easy with decimal keyboards that use commas. Either normalize a supported decimal comma to a dot or reject the raw input while retaining the previous tolerance. Add a test through this handler, since the parser-only tests bypass the transformation.
| const pub = getPublicClient(config, { chainId: CHAIN.id })!; | ||
| const wallet = await getWalletClient(config, { chainId: CHAIN.id }); | ||
| const min = minOut(quote_.out, SLIPPAGE_BPS); | ||
| const min = minOut(quote_.out, slippageBps); |
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[P2] Pass the selected tolerance to the error formatter too. Execution now uses slippageBps, but the catch still calls friendlyError(err) with its default 1%. I reproduced a 3% trade encoding a minimum of 970 from a quote of 1000, then displaying "Price moved more than 1%. Try again." Pass { slippagePct: slippageBps / 100 } to friendlyError using the same transaction-captured value.
…n errors (PR Gitlawb#30) - parseSlippageField rejects minus/letters, normalizes decimal comma to dot - input handler no longer strips chars before parsing (0,5 no longer becomes 5%) - trade captures slippageBps per transaction and passes it to friendlyError
… fallback on preflight fail (PR Gitlawb#30 CI) - declare tradeSlippageBps outside try, assign after preflight awaits - catch uses it when set, else default (preflight errors are never slippage reverts)
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Thanks @Vasanthdev2004 for the review! Addressed both P2s plus the CI failure: new |
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Thanks for working through the earlier feedback. The custom field now handles 0,5 as 0.5% without turning negative or invalid input into a larger tolerance. The transaction and its error message also use the same captured slippage value.
All eight slippage tests passed. Additional handler-level checks covered a preference change while wallet lookup was waiting, duplicate clicks, stale quotes, persistence and blocked storage. Wallet calls were stubbed; no funded transaction was sent. Current app and contract CI are green.
The issues from my previous review are resolved. Approving this version.
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TradePanel hardcoded 1% slippage (Minimum received + execute path). On fresh launches that is often too tight (avoidable reverts / frontrun failures) with no override.
This PR adds 0.5/1/3% presets plus a custom 0.1-20% input, persisted per chain in localStorage, wired into minOut() and the Minimum received row. Default stays 1% so behavior is unchanged unless the user picks otherwise. Stored value loads through useSyncExternalStore with a server snapshot (same pattern as first-buy-session), so hydration never mismatches; invalid input shows an inline 0.1-20% hint and keeps the previous value.
Files: new app/src/lib/launchpad/trade-slippage.ts + trade-slippage.test.ts (7 tests), TradePanel.tsx wiring.
Verified locally on upstream/main base:
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