Currently, karma doesn't export karma command.
You recommend to install karma-cli locally to the project in case of npm test.
This is why It's for separation of concerns. #1078 #1322

But, some documents describe using ./node_modules/karma/bin/karma now.

https://github.com/karma-runner/karma/blob/master/docs/plus/02-travis.md
https://github.com/karma-runner/karma/blob/master/docs/plus/04-semaphore.md

In addition, karma-cli specifies the preferGlobal.
https://github.com/karma-runner/karma-cli/blob/master/package.json#L41

I feel that there is no consistency.

Solution

1. Export karma command and treats karma-cli as just global command I/F. (+1)
2. Remove bin/karma from this repository and remove the preferGlobal from karma-cli.

Thank you.