yeah we work on linters, tooling and the like highly specific single page, highly similar code.
you can't get around it. We have pretty low boilerplate in all the codebases I happen to manage but the sad part is there is no getting around porting of specific rules, setting up better metric analysis and reporting systems and such.
If you have been involved in programming professionally for a while, you would know you just can't get around the chore like works sometimes. Ofc it's not a long term goal to keep going this way but we needed a solution to simplify our challenges as we move on.