yard, rubocop and lower ruby to 2.7

.rubocop.yml

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+# https://evilmartians.com/chronicles/rubocoping-with-legacy-bring-your-ruby-code-up-to-standard
+inherit_mode:
+  merge:
+    - Exclude
+
+inherit_from:
+  - .rubocop/rails.yml
+  - .rubocop_todo.yml
+  - .rubocop/strict.yml
+  # - .rubocop/rspec.yml
+  #  - node_modules/@prettier/plugin-ruby/rubocop.yml
+
+require:
+  - rubocop-performance
+  - rubocop-rake
+  # - rubocop-minitest
+
+AllCops:
+  TargetRubyVersion: 3.2
+  TargetRailsVersion: 7.0
+  SuggestExtensions: false
+  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
+  # to ignore them, so only the ones explicitly set in this file are enabled.
+  DisabledByDefault: true
+  Exclude:
+    - 'db/**/*'
+    - 'config/**/*'
+    - 'script/**/*'
+    - '**/Gemfile.lock'
+    - '**/Rakefile'
+    - '**/rails'
+    - '**/vendor/**/*'
+    - '**/spec_helper.rb'
+    - 'node_modules/**/*'
+    - 'bin/*'
+    - !ruby/regexp /old_and_unused\.rb$/
+
+Layout/LineLength:
+  Max: 300
+  AllowedPatterns:
+  - !ruby/regexp /\A#/
+
+# Prefer &&/|| over and/or.
+Style/AndOr:
+  Enabled: true
+
+# Align `when` with `case`.
+Layout/CaseIndentation:
+  Enabled: true
+
+Layout/ClosingHeredocIndentation:
+  Enabled: true
+
+Layout/ClosingParenthesisIndentation:
+  Enabled: true
+
+# Align comments with method definitions.
+Layout/CommentIndentation:
+  Enabled: true
+
+Layout/ElseAlignment:
+  Enabled: true
+
+# Align `end` with the matching keyword or starting expression except for
+# assignments, where it should be aligned with the LHS.
+Layout/EndAlignment:
+  Enabled: true
+  EnforcedStyleAlignWith: variable
+  AutoCorrect: true
+
+Layout/EndOfLine:
+  Enabled: true
+
+Layout/EmptyLineAfterMagicComment:
+  Enabled: true
+
+Layout/EmptyLinesAroundAccessModifier:
+  Enabled: true
+  EnforcedStyle: only_before
+
+Layout/EmptyLinesAroundBlockBody:
+  Enabled: true
+
+# In a regular class definition, no empty lines around the body.
+Layout/EmptyLinesAroundClassBody:
+  Enabled: true
+
+# In a regular method definition, no empty lines around the body.
+Layout/EmptyLinesAroundMethodBody:
+  Enabled: true
+
+# In a regular module definition, no empty lines around the body.
+Layout/EmptyLinesAroundModuleBody:
+  Enabled: true
+
+# Use Ruby >= 1.9 syntax for hashes. Prefer { a: :b } over { :a => :b }.
+Style/HashSyntax:
+  Enabled: true
+
+# Method definitions after `private` or `protected` isolated calls need one
+# extra level of indentation.
+Layout/IndentationConsistency:
+  Enabled: true
+  EnforcedStyle: indented_internal_methods
+  Exclude:
+    - '**/*.md'
+
+# Two spaces, no tabs (for indentation).
+Layout/IndentationWidth:
+  Enabled: true
+
+Layout/LeadingCommentSpace:
+  Enabled: true
+
+Layout/SpaceAfterColon:
+  Enabled: true
+
+Layout/SpaceAfterComma:
+  Enabled: true
+
+Layout/SpaceAfterSemicolon:
+  Enabled: true
+
+Layout/SpaceAroundEqualsInParameterDefault:
+  Enabled: true
+
+Layout/SpaceAroundKeyword:
+  Enabled: true
+
+Layout/SpaceAroundOperators:
+  Enabled: true
+
+Layout/SpaceBeforeComma:
+  Enabled: true
+
+Layout/SpaceBeforeComment:
+  Enabled: true
+
+Layout/SpaceBeforeFirstArg:
+  Enabled: true
+
+Style/DefWithParentheses:
+  Enabled: true
+
+# Defining a method with parameters needs parentheses.
+Style/MethodDefParentheses:
+  Enabled: true
+
+Style/ExplicitBlockArgument:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  EnforcedStyle: never
+  # Exclude:
+  #   - 'actionview/test/**/*.builder'
+  #   - 'actionview/test/**/*.ruby'
+  #   - 'actionpack/test/**/*.builder'
+  #   - 'actionpack/test/**/*.ruby'
+  #   - 'activestorage/db/migrate/**/*.rb'
+  #   - 'activestorage/db/update_migrate/**/*.rb'
+  #   - 'actionmailbox/db/migrate/**/*.rb'
+  #   - 'actiontext/db/migrate/**/*.rb'
+  #   - '**/*.md'
+
+Style/MapToHash:
+  Enabled: true
+
+Style/RedundantFreeze:
+  Enabled: true
+
+# Use `foo {}` not `foo{}`.
+Layout/SpaceBeforeBlockBraces:
+  Enabled: true
+
+# Use `foo { bar }` not `foo {bar}`.
+Layout/SpaceInsideBlockBraces:
+  Enabled: true
+  EnforcedStyleForEmptyBraces: space
+
+# Use `{ a: 1 }` not `{a:1}`.
+Layout/SpaceInsideHashLiteralBraces:
+  Enabled: true
+
+Layout/SpaceInsideParens:
+  Enabled: true
+
+# Check quotes usage according to lint rule below.
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+# Detect hard tabs, no hard tabs.
+Layout/IndentationStyle:
+  Enabled: true
+
+# Empty lines should not have any spaces.
+Layout/TrailingEmptyLines:
+  Enabled: true
+
+# No trailing whitespace.
+Layout/TrailingWhitespace:
+  Enabled: true
+
+# Use quotes for string literals when they are enough.
+Style/RedundantPercentQ:
+  Enabled: true
+
+Lint/AmbiguousOperator:
+  Enabled: true
+
+Lint/AmbiguousRegexpLiteral:
+  Enabled: true
+
+Lint/DuplicateRequire:
+  Enabled: true
+
+Lint/DuplicateMagicComment:
+  Enabled: true
+
+Lint/DuplicateMethods:
+  Enabled: true
+
+Lint/ErbNewArguments:
+  Enabled: true
+
+Lint/EnsureReturn:
+  Enabled: true
+
+# Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
+Lint/RequireParentheses:
+  Enabled: true
+
+Lint/RedundantStringCoercion:
+  Enabled: true
+
+Lint/UriEscapeUnescape:
+  Enabled: true
+
+Lint/UselessAssignment:
+  Enabled: true
+
+Lint/DeprecatedClassMethods:
+  Enabled: true
+
+Style/EvalWithLocation:
+  Enabled: true
+  Exclude:
+    - '**/test/**/*'
+
+Style/ParenthesesAroundCondition:
+  Enabled: true
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+
+Style/RedundantBegin:
+  Enabled: true
+
+Style/RedundantReturn:
+  Enabled: true
+  AllowMultipleReturnValues: true
+
+Style/RedundantRegexpEscape:
+  Enabled: true
+
+Style/Semicolon:
+  Enabled: true
+  AllowAsExpressionSeparator: true
+
+# Prefer Foo.method over Foo::method
+Style/ColonMethodCall:
+  Enabled: true
+
+Style/TrivialAccessors:
+  Enabled: true
+
+# Prefer a = b || c over a = b ? b : c
+Style/RedundantCondition:
+  Enabled: true

.rubocop/markdown.yml

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+Markdown:
+  # Whether to run RuboCop against non-valid snippets
+  WarnInvalid: false
+  # Whether to lint codeblocks without code attributes
+  Autodetect: false

.rubocop/minitest.yml

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+Minitest/AssertRaisesWithRegexpArgument:
+  Enabled: true
+
+Minitest/AssertWithExpectedArgument:
+  Enabled: true
+
+Minitest/SkipEnsure:
+  Enabled: true
+
+Minitest/UnreachableAssertion:
+  Enabled: true