4.0.2

Release note

Library changes

rbs collection

• Fix: pathname not written to lockfile. (#2889)

Miscellaneous

• Fix test failure on Windows in ruby/ruby (#2900)
• Fix test for Ruby 4.1 (#2899)

3.10.4

Release note

Library changes

rbs collection

• [Backport] [3.10] Fix: pathname not written to lockfile. (#2896)

4.0.0

Release note

RBS 4.0 ships with experimental RBS inline syntax support, allowing you to write type annotations directly in Ruby source files. See docs/inline.md for the syntax details.

class Calculator
  # @rbs (Integer, Integer) -> Integer
  def add(a, b) = a + b
end

Note: RBS inline is still experimental and may change in future releases.

This release also introduces two language changes: type argument support for singleton types (singleton(T)[S]) mainly for Sorbet integration, and generic type parameter lower bounds (T < S).

Signature updates

Updated classes/modules/methods: Addrinfo, Array, BasicObject, BigDecimal, Binding, CGI, Comparable, Complex, Digest::SHA2, Encoding::Converter, Enumerable, Enumerator, Enumerator::ArithmeticSequence, Enumerator::Lazy, Fiber, File, FileUtils, Float, Hash, IO, IO::TimeoutError, Integer, JSON, Kernel, Kconv, Math, Method, Minitest, Module, Numeric, ObjectSpace, Open3, OpenURI, OptionParser, PStore, Pathname, Proc, Process::Status, Psych, Ractor, Random, Random::Formatter, Range, Rational, RBS::Unnamed::TopLevelSelfClass, Ripper::Lexer::Elem, Ruby, RubyVM, SecureRandom, Set, Socket, String, StringScanner, TCPSocket, Thread, URI, URI::Generic, Zlib::GzipReader, Zlib::GzipWriter

• Remove deprecated types (#2880)
• Add type RBS::Unnamed::TopLevelSelfClass to core (#2362)
• Graduate bundled gems from Ruby v4.0 (#2852)
• stdlib: Add missing Psych methods and exception classes (#2850)
• Add variants with positional argument to Hash#transform_keys (#2848)
• add extra kwarg options for File#initialize and derivatives (#2798)
• pstore: fixes types, treat it as a collection (#2806)
• Add signatures for {Module,Proc}#ruby2_keywords (#2805)
• Make Zlib::GzipWriter.new level and strategy parameters optional (#2810)
• URI.(s) does string coercion (#2825)
• Fix String#append_as_bytes to accept Integer (#2817)
• [Comparable] Add in Comparable::_CompareToZero (#2697)
• [Kernel] Add Kernel.trace_var and Kernel.untrace_var (#2682)
• Add signature for Module#method_undefined (#2804)
• Fix Zlib::GzipWriter signatures (#2803)
• GzipWriter#initialize only takes 1 required positional arg (#2799)
• Fix accessibility of method in Module (#2802)
• Graduate kconv (#2794)
• Fix test related to pathname (#2789)
• Split pathname to core and stdlib (#2777)
• [Kernel] Narrow caller_locations (#2745)
• Ruby 4.1 changed source_location type (#2784)
• Remove ObjectSpace.count_nodes (#2779)
• Support selector for String#strip family. (#2775)
• Add Ruby, Array#find, and Array#rfind (#2767)
• Update minitest (#2761)
• Support BigDecimal v4 (#2758)
• Update rdoc and comments (#2733)
• Update cgi and cgi/escape type definitions (#2728)
• Update RBS files for Ruby 4 (#2731)
• Update existing docs (#2724)
• Remove reference to JSON.deep_const_get (#2701)
• Remove deprecated methods in JSON (#2366)
• Update FileUtils to v1.8.0 (#2700)
• Avoid overloading where arguments are identical (#2559)
• Move Pathname to core from stdlib (#2705)
• Remove undocumented #nonzero? (#2543)
• Add signature for OptionParser#raise_unknown (#2735)
• Add signature for Open3.popen2 (#2734)
• Add RFC2396_PARSER to URI module (#2727)
• Add signature for Open3.capture3 (#2714)
• Remove sig for IO#{ready?,nread} (#2710)
• Accept nil state parameter in to_json type signatures (#2691)
• Add type of Open3.popen3 (#2699)
• unsetenv_others and close_others only allows bool. (#2698)
• Add deprecated annotation to attr with bool args (#2693)
• Update open3 (#2692)
• Add signature for SecureRandom.bytes (#2690)
• Set %a{deprecated} to deprecated core methods (#2664)
• Migrate usages of ::_ToPath to use ::path instead (#2677)
• Add missing signatures for Random::Formatter (#2680)
• Split Random::Formatter to core and stdlib (#2661)
• Skip test cases of developing methods for Pathname (#2648)
• Add signature Random.seed (#2649)
• Update string.rbs to avoid deprecation warning in Steep (#2655)
• Add sig IO#pread and IO#pwrite (#2647)
• Refine signature of Numeric#step and add type of Enumerator::ArithmeticSequence (#2600)
• Remove undocumented override methods (#2622)
• Add docs (#2625)
• Remove undocumented methods for imaginary (#2620)
• Update securerandom (#2619)
• Drop undocumented #eql? (#2618)
• Just use Numeric#+@ and return self (#2597)
• Drop undocumented #dup (#2598)
• Add signature for Digest::SHA2 (#2573)
• Add signatures for OpenURI (#2574)
• Add signature for IO::TimeoutError (#2571)
• Add signatures for Set (#2570)
• Add signature for Enumerator#+ (#2567)
• Add signature for Enumerator::Lazy#eager (#2568)
• Add signature for Fiber#blocking (#2566)
• Support BasicObject to avoid NoMethodError for RBS::Test::TypeCheck (#2565)
• Add documentation for Range#{minmax,count,to_a,entries} (#2562)
• Delegate to Enumerable from Range#{min,max} (#2540)
• Add URI::Generic#+ (#2535)
• Make IO.binread, IO.binwrite, IO.read and IO.write accept _ToPath (#2378)
• Support pattern argument for Enumerable#{all,any,none,one}? (#2368)
• fixing sig for addrinfo (#2464)

Language updates

• Add type arguments support to singleton types (#2502)
• Move the note about lower bound (#2517)
• Add support for lower bounds in type parameters (#2490)

Library changes

• Add #type_fingerprint methods (#2879)
• top for membership predicates of collection types (#2878)
• Add block parameter (&block) type declaration (#2875)
• Add splat (*a) and double-splat (**a) parameter support (#2873)
• Add parameter type inline annotation (#2443)
• Reduce compile warnings (#2871)
• Specify input range by byte offsets (#2863)
• add extern "C" wrapping to rbs.h when using C++ (#2855)
• Automatically inherits super method type if unannotated (#2858)
• Add ... syntax to method type inline annotation syntax (#2856)
• Fix for string reference corruption issue ([#2836](https://github....

3.10.3

Release note

This is a minor fix around the dependency to tsort.

Pull Requests

• Merge pull request #2601 from ima1zumi/add-tsort-dep (#2834)

4.0.0.dev.5

Release note

Miscellaneous

• Update steep (#2328)

3.10.2

Release note

This is a minor fix on arena allocator alignment.

Pull Requests

• Merge pull request #2788 from ruby/fix-alloc-alignment (#2790)

3.10.1

Release note

This is a follow-up release for Ruby 4.0.0 with documentation update based on Ruby 4.0.0, and bugfixes related to set/pathname library loading.

Pull Requests

• Merge pull request #2777 from ksss/pathname-ext (#2786)
• Ruby 4.0.0 backports (#2785)
• [Backport] Fix subtraction of civar (#2783)
• [Backport] Update ruby to 4.0 (#2778)

3.10.0

Release note

RBS 3.10.0 ships with a pure C parser implementation, signature updates for Ruby 4.0, and various bug fixes.

Pure C parser implementation

The new parser implementation was announced at RubyKaigi 2025 and is finally shipped as a RubyGem!

The new parser is faster than the one in 3.9 and is portable — it is independent of the Ruby runtime and is used to implement Sorbet’s RBS support.

Type definition of bundled gems

The type definitions of cgi have been moved to gem_rbs_collection, as it has been migrated to a bundled gem in Ruby 4.0

cgi-escape has been added to stdlib. You may need to declare a dependency on cgi-escape in your manifest.yaml, add -r cgi-escape to your command line, or update your type checker configuration.

dependencies:
  - name: cgi-escape

The type definitions for pathname have also been moved from stdlib to core, as it is now implemented as part of the core library.

Pull Requests

• [Backport] Support rdoc v7 (#2770)
• [Backport] Check tuple type length (#2766)
• Backport update to 4.0.0-preview3 (#2768)
• [Backport] Remove test code for bundled gems (#2762)
• Merge pull request #2761 from ruby/update-minitest (#2763)
• [Backport] Support BigDecimal v4 (#2759)
• Parser/lexer backports (#2756)
• Merge pull request #2753 from ruby/delete-printf (#2754)
• Backports (#2751)
• Merge pull request #2728 from ruby/cgi (#2747)
• Merge pull request #2729 from ruby/rbs-assert (#2748)
• Merge pull request #2749 from ruby/fix-test (#2750)
• Backport RBS file updates (#2742)
• Backport JSON PRs (#2740)
• Merge pull request #2718 from ruby/ruby-4 (#2741)
• [Backport] Move Pathname to core from stdlib (#2730)
• Backport rdoc 6.16 (#2722)
• Backport rdoc support (#2719)
• Backport "Remove sig for IO#{ready?,nread}" (#2720)
• Backport more pure C parsers (#2679)
• Backport module name normalization (#2673)
• Backport pure-C parser (#2671)
• Fix test failure (#2672)

3.10.0.pre.2

Release note

3.10.0.pre.1

Release note