Link to bug demonstration repository

We are trying to update to v15 in https://github.com/webhintio/hint, the PR is webhintio/hint#3513

And the relevant output of CI is here

Expected Behavior

webhint uses a monorepo approach where we have a common .nycrc file in the root of the project. In that file we set the minimum threshold to 80 for branches.
Some packages might override the default configuration. packages/hint is one of those where the package.json has an nyc property that sets "branches": 75.

Unfortunately, it seems like with the newest nyc version, properties in the extends file cannot be override.

Observed Behavior

I've tried:

• removing 80 from extends and having 75 in the package: test pass (expected as the coverage is 75.66%)
• removing 80 from extends and having 80 in the package: test fail (expected)
• changing 80 by 90 in the extends. Test fail saying the minimum threshold of 90 is not meet

This does not happen with previous nyc versions.

The documentation says:

You can then add the specific configuration options you want that aren't in that particular shared config, e.g.

(emphasis is mine) which maybe believe this might be intentional, but seems like a huge step back (ie.: having to have to set the coverage in each project).

Troubleshooting steps

• still occurring when I put cache: false in my nyc config

Environment Information

  System:
    OS: Linux 4.19 Ubuntu 18.04.4 LTS (Bionic Beaver)
    CPU: (8) x64 Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz
    Memory: 8.63 GB / 12.17 GB
  Binaries:
    Node: 12.16.0 - ~/.nvm/versions/node/v12.16.0/bin/node
    Yarn: 1.21.1 - /usr/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.16.0/bin/npm