What problem does this feature solve?

vue cli (cli-plugin-eslint) 4.4.6 uses eslint-loader 2.2.1. eslint-loader 2.2.1 does not support the 7.x release of eslint, which is the most recent version of eslint. The latest version of eslint-loader is 4.0.2 which does support the 7.x release of eslint. Can the version of eslint-loader used by cli-plugin-eslint be updated to the most recent version? Word of caution that doing so will drop support for versions of eslint less than 6.x.

What does the proposed API look like?

No api change, just version change in package.json for cli-plugin-eslint.