Cannot read property 'UriResolver' of undefined

[haraldini]

Just did a simple out of the box yarn install on an existing project. npx waffle just throws this error on a very basic test: Cannot read property 'UriResolver' of undefined

[snario]

Also getting this @marekkirejczyk

[marekkirejczyk]

Looking into it

[snario]

This patch fixed it on our repo:

https://github.com/counterfactual/monorepo/blob/c262920ab4b170a3b732e568ee77c7cc5b1aeea4/patches/%40resolver-engine%2Bimports-fs%2B0.3.2.patch#L1-L22

[marekkirejczyk]

I have hard times reproduction. I already looked into @snario repo, I think it might be related to truffle-flattener that requires a different version of @resolver-engine/imports-fs.

@haraldini Can you link repo, or yarn.lock file, so I can look into it?

I'll dig deeper tomorrow.

[haraldini]

I moved on and didn't keep a snapshop I'm afraid. I was using ZepKit as a starting point if that that might help somewhat: truffle unbox zeppelinos/zepkit

[Amxx]

Also getting the same error is some cases:
$ waffle waffle.js
→ ok
$ yarn build ("build": "waffle waffle.json")
→ not ok

Happens on kitsune-contract and universalloginsdk

[Amxx]

@snario 's fix works for me

[cehali]

Hi,
I recreated this error and it turns out that it is a problem with zos-lib. Zos-lib requires truffle-flattener which requires an older version of @resolver-engine/core. Openzeppelin had the same problem: OpenZeppelin/openzeppelin-sdk#1059. Funny thing is that using npm instead of yarn install the newest version of @resolver-engine/core. So there are two solutions, either you can use npm instead of yarn (I believe it is not desired) or you can add "@resolver-engine/core": "^0.3.3" to your dependency to force yarn to install the newest and compatible version. I added this dependency to Amxx code and I could build and run tests without problem mentioned in this issue.

[marekkirejczyk]

Closing, please reopen if it is still an issue