🦾 Standard::Rubocop::Lts

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I've summarized my thoughts in this blog post.

Extended standard (Standard Ruby) config shims for any and every version of Ruby, back to Ruby version 1.8. Enables Ruby projects to more confidently support even the most finely-aged Rubies. Part of the rubocop-lts gem family.

Use the rules standard gives you, and then add more, to increase your code's compatibility across multiple versions of Ruby.

Only reach as far back as you need to go.

The RuboCop LTS family of gems is the distillation of Ruby source-compatibility expertise into per-Ruby-version sets of configurations. It remains unsafe to upgrade RuboCop, or Standard, in a project that supports EOL Rubies.

Avoid bike-shedding, use rubocop-lts in every project, and let it manage your linting complexity.

Tokens to Remember
Works with JRuby
Works with Truffle Ruby
Works with MRI Ruby 4
Works with MRI Ruby 3
Support & Community
Source
Documentation
Compliance
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Maintainer 🎖️
... 💖	🧊 🐙 🛖 🧪

Compatible with MRI Ruby 3.2.0+, and concordant releases of JRuby, and TruffleRuby. CI workflows and Appraisals are generated for MRI Ruby 3.2.0+. This test floor is configured by ruby.test_minimum in .kettle-jem.yml and may be higher than the gem's runtime compatibility floor when legacy Rubies are not practical for the current toolchain.

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Alternatively:

Install the gem and add to the application's Gemfile by executing:

bundle add standard-rubocop-lts

If bundler is not being used to manage dependencies, install the gem by executing:

gem install standard-rubocop-lts

Add to the top of your project's .rubocop.yml configuration file:

inherit_gem:
  # Replace {RUBY_MAJOR_VERSION} with the minimum major version of ruby you want to target.
  # Replace {RUBY_MINOR_VERSION} with the minimum minor version of ruby you want to target.
  standard-rubocop-lts: config/ruby-{RUBY_MAJOR_VERSION}.{RUBY_MINOR_VERSION}.yml

Among other settings specific to your chosen minimum version of ruby, the above effectively results in the following config (& more):

# We want the Exclude and Include directives from different
#   config files to get merged, not overwritten
inherit_mode:
  merge:
    - Exclude
    - Include

require:
  - standard-rubocop-lts
  - standard
  - standard-performance
  - standard-custom
  - rubocop-performance

# Load basic rules for this version of Ruby from standard.
# Rules are overridden in a LIFO stack.
# If rubocop-performance is listed first, and standard-performance after it,
#   then rubocop-performance's rules will take precedence.
# This is the opposite of what you might expect.
# Below: standard's rules override rubocop-performance's (mostly disabling rules)
inherit_gem:
  standard: config/ruby-1.8.yml
  standard-performance: config/ruby-1.8.yml
  standard-custom: config/base.yml
  rubocop-performance: config/default.yml

AllCops:
  NewCops: enable

# See:
#   https://github.com/rubocop/rubocop-performance/issues/240
#   https://github.com/rubocop/rubocop-performance/pull/241
Performance/Casecmp:
  Enabled: false

# See: https://github.com/rubocop/rubocop-performance/issues/329#issuecomment-1375527811
Performance/BlockGivenWithExplicitBlock:
  Enabled: false

# See: https://github.com/rubocop/rubocop-performance/issues/329#issuecomment-1451511402
Performance/ArraySemiInfiniteRangeSlice:
  Enabled: false

# See: https://github.com/rubocop/rubocop-performance/issues/329#issuecomment-1451511402
Performance/BigDecimalWithNumericArgument:
  Enabled: false

# See: https://github.com/rubocop/rubocop-performance/issues/329#issuecomment-1451511402
Performance/IoReadlines:
  Enabled: false

# Plus: Ruby-version-specific configs provided by "standard" family of gems
# Plus+: Ruby-version-specific configs that standard does not have

Instead of directly using this gem, standard-rubocop-lts, use rubocop-lts, which depends on this gem. Then you don't need to worry about it, as it will be configured for you by rubocop-lts.

# NOTE: Picking the right version of rubocop-lts automatically aligns:
#       - gemspec's required_ruby_version
#       - RuboCop's TargetRubyVersion
# e.g. v24 for Ruby >= 3.2.0
gem "rubocop-lts", "~> 24.0", require: false

See CONTRIBUTING.md.

While rubocop-lts tools are free software and will always be, the project would benefit immensely from some funding. Raising a monthly budget of... "dollars" would make the project more sustainable.

We welcome both individual and corporate sponsors! We also offer a wide array of funding channels to account for your preferences. Currently, Open Collective is our preferred funding platform.

If you're working in a company that's making significant use of rubocop-lts tools we'd appreciate it if you suggest to your company to become a rubocop-lts sponsor.

You can support the development of rubocop-lts tools via GitHub Sponsors, Liberapay, PayPal, Open Collective and Tidelift.

Support us with a monthly donation and help us continue our activities. [Become a backer]

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I’m driven by a passion to foster a thriving open-source community – a space where people can tackle complex problems, no matter how small. Revitalizing libraries that have fallen into disrepair, and building new libraries focused on solving real-world challenges, are my passions. I was recently affected by layoffs, and the tech jobs market is unwelcoming. I’m reaching out here because your support would significantly aid my efforts to provide for my family, and my farm (11 🐔 chickens, 2 🐶 dogs, 3 🐰 rabbits, 8 🐈‍ cats).

If you work at a company that uses my work, please encourage them to support me as a corporate sponsor. My work on gems you use might show up in bundle fund.

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See SECURITY.md.

If you need some ideas of where to help, you could work on adding more code coverage, or if it is already 💯 (see below) check issues or PRs, or use the gem and think about how it could be better.

We so if you make changes, remember to update it.

See CONTRIBUTING.md for more detailed instructions.

See CONTRIBUTING.md.

Everyone interacting with this project's codebases, issue trackers, chat rooms and mailing lists agrees to follow the .

Made with contributors-img.

Also see GitLab Contributors: https://gitlab.com/rubocop-lts/standard-rubocop-lts/-/graphs/main

This library follows for its public API where practical. For most applications, prefer the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency("standard-rubocop-lts", "~> 2.0")

Dropping support for a platform can be a breaking change for affected users. If a release changes supported platforms, it should be called out clearly in the changelog and versioned with that impact in mind.

To get a better understanding of how SemVer is intended to work over a project's lifetime, read this article from the creator of SemVer:

• "Major Version Numbers are Not Sacred"

See CHANGELOG.md for a list of releases.

The gem is available as open source under the terms of the MIT .

See LICENSE.md for the official copyright notice.

• Copyright (c) 2023-2026 Peter H. Boling

Maintainers have teeth and need to pay their dentists. After getting laid off in an RIF in March, and encountering difficulty finding a new one, I began spending most of my time building open source tools. I'm hoping to be able to pay for my kids' health insurance this month, so if you value the work I am doing, I need your support. Please consider sponsoring me or the project.

To join the community or get help 👇️ Join the Discord.

To say "thanks!" ☝️ Join the Discord or 👇️ send money.

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Many parts of this project are actively managed by a kettle-jem smart template utilizing StructuredMerge.org merge contracts.

Thanks for RTFM. ☺️