old chalk 2 using __proto__ is installed by babel/code-frame

Hi,

this is problematic, because some node/deno users disable __proto__.

However https://github.com/babel/babel/issues/13728 babel 7 supports node 6, and won't update its chalk dependency.
Best solution would be to use another lib for codeFrameColumns.

Trace how Babel's code-frame package and codeFrameColumns are brought into better-ajv-errors, starting with the package dependency and the entry point that formats validation errors. Check the existing behavior around __proto__ usage and identify a replacement that fits the stated Node 6 compatibility; done means the old Chalk 2 path is no longer installed while code-frame output still works.

Written by the indexing model from the issue text.