Missing magic comment `# frozen_string_literal: true` and "Freeze mutable objects assigned to constants.".

[ghost]

I have this graphql_policy.rb:

class GraphqlPolicy
  RULES = {

    Types::QueryType => {
      '*': ->(_obj, _args, ctx) { ctx[:current_user] }
    }
  }

  def self.guard(type, field)
    RULES.dig(type, field)
  end
end

Now using rubocop on it I got this:

What we can do?

[ghost]

Maybe RULES.freeze = {?

[exAspArk]

@johnunclesam the issue doesn't seem to be related to the gem. You or your IDE is using https://github.com/bbatsov/rubocop which checks the syntax of your code.

• Add the # frozen_string_literal: true comment on top of your file to make the strings defined in the file immutable

• Add RULES = { ... }.freeze to make your hash object immutable