Crash report: `TypeError: Cannot read properties of undefined (reading '0')`
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- Dominant language
- TypeScript
- Stars
- 5.5k
- Forks
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Description
URL
https://app.uniswap.org/#/add/ETH/0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
mintV3 state
{
"independentField": "CURRENCY_A",
"typedValue": "",
"startPriceTypedValue": "",
"leftRangeTypedValue": "",
"rightRangeTypedValue": ""
}
Error
TypeError: Cannot read properties of undefined (reading '0')
Stacktrace
TypeError: Cannot read properties of undefined (reading '0')
at https://app.uniswap.org/static/js/main.44a3bb87.chunk.js:1:402078
at Array.reduce (<anonymous>)
at https://app.uniswap.org/static/js/main.44a3bb87.chunk.js:1:402002
at Object.Ta [as useMemo] (https://app.uniswap.org/static/js/4.ab98f63c.chunk.js:2:1764876)
at t.useMemo (https://app.uniswap.org/static/js/4.ab98f63c.chunk.js:2:1684348)
at https://app.uniswap.org/static/js/main.44a3bb87.chunk.js:1:401639
at _g (https://app.uniswap.org/static/js/main.44a3bb87.chunk.js:1:402960)
at Xg (https://app.uniswap.org/static/js/main.44a3bb87.chunk.js:1:405353)
at ia (https://app.uniswap.org/static/js/4.ab98f63c.chunk.js:2:1760143)
at za (https://app.uniswap.org/static/js/4.ab98f63c.chunk.js:2:1769710)
Device data
{
"ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36",
"browser": {
"name": "Chrome",
"version": "99.0.4844.74",
"major": "99"
},
"engine": {
"name": "Blink",
"version": "99.0.4844.74"
},
"os": {
"name": "Mac OS",
"version": "10.15.7"
},
"device": {},
"cpu": {}
}
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the crash at the supplied add-liquidity URL using the recorded mintV3 state, then trace the minified stack through the useMemo and Array.reduce call sites to locate the source entry point. Done means this URL and state no longer throw the reported TypeError, with coverage for the failing case if the project’s existing tests support it.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- react, typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100