How to tell Rubocop to ignore a specific directory or file

Question

My project is extending open-source classes from a third-party gem that we don't want to hold to the same coding standards as our own code. Refactoring the gem code isn't a viable option. We just want Rubocop to ignore the copied code.

How can I instruct Rubocop to completely ignore a file or directory?

Answer 1

As per orde's comment with the link to the manual I found .rubocop.yml and added the following:

AllCops:
  Exclude:
    - 'path/to/excluded/file.rb'

where the path is relative to .rubocop.yml

Answer 2

From rubocop/default.yml:

AllCops:
  Exclude:
    - 'node_modules/**/*'
    - 'vendor/**/*'

Answer 3

Can also consider comments for a single file. Great for ignoring the linter for a quick and dirty temporary task.

# rubocop:disable all

module TempTask
  ...
end

# rubocop:enable all