Error: TypeError: Cannot read property 'files' of undefined

[steven-gong-aventus]

Hi,
I'm using solidity coverage with the following version:

truffle: v5.1.0
ganache-core: v2.8.0
solidity-coverage: v0.7.0-beta.2

And receives the following error message:

Istanbul reports written to ./coverage/ and ./coverage.json
solidity-coverage cleaning up, shutting down ganache server
Error: TypeError: Cannot read property 'files' of undefined
at Object.run (~\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\migrate\index.js?abc3:92:1)
Truffle v5.1.0 (core: 5.1.0)
Node v10.16.3

I am using the default values in .solcover.js file.

Is there anything I should customize to fix this issue from the default configs?

Thanks

[cgewecke]

@steven-gong-artos If you have a sec could you try using an earlier version of Truffle - maybe 5.0.41 - they just released 5.1.0 - it's possible behavior has changed slightly.

Also, are you getting a coverage report? Is everything except for this final error working?

[cgewecke]

@steven-gong-artos

Was able to run solidity-coverage with Truffle's MetaCoin project on 5.1.0 without any problems.

Do you have a reproduction case for this? Would be happy to look at it.

[cgewecke]

@steven-gong-artos

Suspect this might be caused by something similar to truffle 2419. In that case, an empty folder in the test directory triggers the error. Underlying cause is the node-dir module which solidity-coverage uses for a similar purpose.

[steven-gong-aventus]

Hi @cgewecke,
I've tried truffle 5.0.41 and it returns the same Error.
An incorrect coverage report shows 0% for Stmts, Branch, Funcs, and Lines is generated with this error at the end.

[cgewecke]

@steven-gong-artos

I was able to reproduce your error by adding an empty folder to the migrations folder. Could you check that directory for an empty folder, remove it and see if this error goes away?

[cgewecke]

Fix published in 0.7.0-beta.3

[steven-gong-aventus]

Thanks, @cgewecke ,
You are right, migrations/coverage is generated to contain some empty folders.
Once this migrations/coverage folder is removed, this TypeError disappears.