react-scripts@next.a671462c no-unused-args

[javadoug]

react-scripts@next.a671462c build fails on CI=true because eslint rules no-unused-args.

This used to pass. I'm hoping it will still pass.

// production build and env var is set CI=true
function doStuffWithSomeArgs(argNotUsed, argUsed) {
    return argUsed + 1
}
Failed to compile.
warning 'argNotUsed' is defined but never used no-unused-vars

Environment

OS: macOS High Sierra 10.13.6
Node: 10.8.0
Yarn: 1.9.4
npm: 6.2.0
Watchman: Not Found
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: Not Found

Steps to Reproduce

build a file that has an unused arg before a used arg

// production build and env var is set CI=true
function doStuffWithSomeArgs(argNotUsed, argUsed) {
    return argUsed + 1
}

build with CI=true environment variable set

### Expected Behavior

should compile without warnings

### Actual Behavior

Failed to compile.
warning 'argNotUsed' is defined but never used no-unused-vars

### Reproducible Demo

[Timer]

Hmm, I don't remember why we made unused args a warning. We'll probably remove this, but I'm not sure of the original reasoning.

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