Unhandled Promise Rejection in v0.7.20

[barakman]

Using:

• solidity-coverage 0.7.20
• truffle 5.4.33
• solc 0.8.12

Executing truffle run coverage results with:

UnhandledRejections detected
Promise {
  <rejected> TypeError: Cannot read private member from an object whose class did not declare it
      at __classPrivateFieldGet (/MyProject/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:10:94)
      at close (/MyProject/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:221:13)
      at /MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:32:6
      at new Promise (<anonymous>)
      at /MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:6:9
      at ret (/MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:56:76)
      at API.finish (/MyProject/node_modules/solidity-coverage/lib/api.js:226:36)
      at Object.finish (/MyProject/node_modules/solidity-coverage/plugins/resources/plugin.utils.js:299:22)
      at plugin (/MyProject/node_modules/solidity-coverage/plugins/truffle.plugin.js:121:15)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
} TypeError: Cannot read private member from an object whose class did not declare it
    at __classPrivateFieldGet (/MyProject/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:10:94)
    at close (/MyProject/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:221:13)
    at /MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:32:6
    at new Promise (<anonymous>)
    at /MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:6:9
    at ret (/MyProject/node_modules/solidity-coverage/node_modules/pify/index.js:56:76)
    at API.finish (/MyProject/node_modules/solidity-coverage/lib/api.js:226:36)
    at Object.finish (/MyProject/node_modules/solidity-coverage/plugins/resources/plugin.utils.js:299:22)
    at plugin (/MyProject/node_modules/solidity-coverage/plugins/truffle.plugin.js:121:15)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

This problem does not occur when using:

• solidity-coverage 0.7.18
• truffle 5.4.32
• solc 0.8.11

[cgewecke]

Ah! Could you try installing ganache-cli@6.12.2 and then in .solcover.js set the client option as below:

module.exports = {
  client: require('ganache-cli')
}

solidity-coverage is not working correctly with ganache v7 (see #694) which is now default in Truffle >= 5.4.30.

As discussed in the issue you opened last week, I've made ganache-cli something the user has to have as an explicit dependency in their own project (rather than something they're incidentally getting from the plugin).

Apologies, I didn't think this would be a breaking change.

[barakman]

NP, your quick response is well appreciated :)
I followed your instructions, and now I'm getting:

Error: Error: Could not load .solcover.js config file. This can happen if it has a syntax error or the path you specified for it is wrong.Cannot find module 'ganache-cli'
Require stack:
- /MyProject/.solcover.js
- /MyProject/node_modules/solidity-coverage/plugins/resources/plugin.utils.js
- /MyProject/node_modules/solidity-coverage/plugins/truffle.plugin.js
- /MyProject/node_modules/original-require/index.js
- /MyProject/node_modules/truffle/build/cli.bundled.js
    at Object.loadSolcoverJS (/MyProject/node_modules/solidity-coverage/plugins/resources/plugin.utils.js:212:13)
    at plugin (/MyProject/node_modules/solidity-coverage/plugins/truffle.plugin.js:31:25)
    at Object.run (/MyProject/node_modules/truffle/build/webpack:/packages/core/lib/commands/run/runHandler.js:20:1)
    at node:internal/util:360:7
    at new Promise (<anonymous>)
    at bound run (node:internal/util:346:12)
    at Object.module.exports [as run] (/MyProject/node_modules/truffle/build/webpack:/packages/core/lib/commands/run/run.js:18:1)
    at Command.run (/MyProject/node_modules/truffle/build/webpack:/packages/core/lib/command.js:189:1)

[cgewecke]

@barakman Could you double-check that ganache-cli@6.12.2 is installed as a separate dependency in your project?

This error:

Cannot find module 'ganache-cli'

... is what I'd expect if it was missing from the outermost layer of your node_modules.

[barakman]

Oh, it most certainly isn't.
Ever since Truffle has incorporated Ganache as part of its services (no need to run ganache as a separate process, etc), I no longer have it as part of my project dependencies.
Here's what I have in package.json:

    "devDependencies": {
        "decimal.js": "10.3.1",
        "solidity-coverage": "0.7.20",
        "truffle": "5.4.33",
        "web3": "1.7.0"
    }

I would highly prefer to keep it this way, in order to avoid "version collisions" around that area.
To my understanding, part of the idea in incorporating Ganache into Truffle, is that Truffle users no longer need to be "aware of" Ganache in any way (and that includes installation).

[cgewecke]

@barakman This isn't optional for moment because solidity-coverage has stopped working with the latest version of Truffle. Your near-term choices are:

• inconsistent ganache versions: install ganache-cli@6.12.2 and use the client option to load it
• consistent ganache versions: use Truffle <= 5.4.29 (and don't install ganache-cli)

[barakman]

So if I wish to avoid adding a Ganache dependency in my project, my options are:

• Use a non-latest Truffle version
• Use a non-latest Solidity Coverage version

Got it.

Thank you very much for your support, I appreciate it!

[ehsomma]

I have the same issue with version 0.7.20...but if I run "truffle run coverage" from powershell terminal (windows) it works!. Instead if I run it from wsl (linux) I get the error. Just to add more info.

[barakman]

Resolved in 0.8.1. Thank you!

[KaiRo-at]

Resolved in 0.8.1. Thank you!

How can this be resolved in 0.8.1 when that version apparently doesn't support truffle at all any more?

[barakman]

@KaiRo-at - well, TBH, I moved to "Truffle-based" Hardhat configuration:

    "devDependencies": {
        "@nomiclabs/hardhat-truffle5": "2.0.7",
        "@nomiclabs/hardhat-web3": "2.0.0",
        "hardhat": "2.12.4"
    }

So that might be the reason why I've considered it resolved in solidity-coverage 0.8.1.

[cgewecke]

This is ganache related, closing.