# CHANGELOG

## master

## 2.1.0 (2022-02-02)

RBS 2.1 is a release to deliver the types and documents of the new and updated methods of Ruby 3.1.

### Signature updates

* Documents imported from Ruby 3.1 ([\#881](https://github.com/ruby/rbs/pull/881))
* Methods/classes updated in Ruby 3.1 ([\#886](https://github.com/ruby/rbs/pull/886))
* io/wait ([\#865](https://github.com/ruby/rbs/pull/865))
* json ([\#863](https://github.com/ruby/rbs/pull/863))
* nkf ([\#873](https://github.com/ruby/rbs/pull/873))
* openssl ([\#866](https://github.com/ruby/rbs/pull/866))
* `Dir.exists?`, `FileTest#exists?` ([\#884](https://github.com/ruby/rbs/pull/884))
* `FileTest` ([\#880](https://github.com/ruby/rbs/pull/880))
* `Gem::Version#<=>` ([\#869](https://github.com/ruby/rbs/pull/869))
* `Process.clock_gettime` ([\#858](https://github.com/ruby/rbs/pull/858))

### Library changes

* Introduce `rbs annotate` command ([\#881](https://github.com/ruby/rbs/pull/881))
* Make prototype rb to be aware of prepend ([\#861](https://github.com/ruby/rbs/pull/861))
* Fixes incorrect "Invalid Variance" error when method type variable shadows outer type variable ([#889](https://github.com/ruby/rbs/pull/889))

## 2.0.0 (2021-12-24)

### Bounded Generics

RBS 2.0 ships with _bounded generics_, which improves the expressiveness of the language by adding a new syntax to define constraints on type parameters.

```rbs
class PrettyPrint[T < _Output]
  interface _Output
    def <<: (String) -> void
  end

  attr_reader output: T

  def initialize: (T output) -> void
end
```

This is the motivating example I found in the [prettyprint library](https://github.com/ruby/prettyprint).
The `#initialize` receives a object of type `T` and it must have `#<<` method.
This is defined with `< _Output` syntax in the example.
It means _`T` has to be compatible with `_Output` interface._
`PrettyPrint[String]` is okay, but `PrettyPrint[Integer]` is a type error.

See [the PR for details](https://github.com/ruby/rbs/pull/844).

### RBS Collection manager

RBS Collection feature is generally available on RBS 2.0. In short, it is Bundler for RBS. You can manage RBSs of standard libraries and third party gems with `rbs collection` subcommand.

```bash
$ rbs collection init
created: rbs_collection.yaml

# The `install` command set up RBS files and creates `rbs_collection.lock.yaml` file
$ rbs collection install
Installing actionpack:6.0 (actionpack@ce6664cec73)
(...snip...)
Using tsort:0 (/path/to/rbs-2.0.0/stdlib/tsort/0)
It's done! 21 gems' RBSs now installed.

# Now you can use `rbs`, `typeprof` and `steep` commands with the dependencies out of the box!
$ rbs validate
$ typeprof app.rb
$ steep check
```

RBS 2.0 also introduces `manifest.yaml` to declare the dependencies from your gems to standard libraries explicitly.
See [the documentation](https://github.com/ruby/rbs/blob/master/docs/collection.md) for more information.

### Breaking changes

This version contains a bug fix, which potentially breaks the compatibility with older versions.
The super class names in class definitions are now resolved in _outer_ context.
It was an incompatibility with Ruby and [this PR](https://github.com/ruby/rbs/pull/856) fixed the problem.

### Signature updates

* uri ([\#846](https://github.com/ruby/rbs/pull/846), [\#852](https://github.com/ruby/rbs/pull/852), [\#851](https://github.com/ruby/rbs/pull/851), [\#850](https://github.com/ruby/rbs/pull/850), [#849](https://github.com/ruby/rbs/pull/849))

### Language updates

* Bounded generics ([\#844](https://github.com/ruby/rbs/pull/844))
* Resolve super type names in outer context ([\#856](https://github.com/ruby/rbs/pull/856))

### Library changes

* Add `manifest.yaml` for collection to specify stdlib dependencies ([\#808](https://github.com/ruby/rbs/pull/808))
* Remove experimental warning of `rbs collection` ([\#855](https://github.com/ruby/rbs/pull/855))
* Add the utility `#map_type` methods ([\#841](https://github.com/ruby/rbs/pull/841))

## 1.8.1 (2021-12-13)

### Library changes

* Validate `extend` arguments ([\#840](https://github.com/ruby/rbs/pull/840))
* Allow a relative path as git remote in collection ([\#839](https://github.com/ruby/rbs/pull/839))

## 1.8.0 (2021-12-02)

RBS 1.8.0 ships with a language feature enhancement, _generic type alias_.
You can define a type alias with type parameters now.

```rbs
type list[T] = [T, list[T]] | nil  # Defines a list of type T

type int_list = list[Integer]      # List of Integer
type string_list = list[String]    # List of String
```

You can find the detail in the [PR](https://github.com/ruby/rbs/pull/823).

### Signature updates

* `Date#+`, `Date#-` ([\#830](https://github.com/ruby/rbs/pull/830))
* `#include?`, `#member?`, `#delete`, `#count` ([\#835](https://github.com/ruby/rbs/pull/835))

### Language updates

* Generic type alias ([\#823](https://github.com/ruby/rbs/pull/823))

## 1.7.1 (2021-11-18)

### Signature updates

* `Thread#value` ([\#824](https://github.com/ruby/rbs/pull/824/files))

### Library changes

* Unquote parameter name ([\#827](https://github.com/ruby/rbs/pull/827))
* Remove `ruby/signature.rb` ([\#825](https://github.com/ruby/rbs/pull/825))

### Miscellaneous

* Use `untyped` as an expectation of return value of `IO#ready?` in test ([\#828](https://github.com/ruby/rbs/pull/828/files))

## 1.7.0 (2021-11-11)

This version replaces `RBS::Parser` implementation from pure Ruby code based on [Racc](https://github.com/ruby/racc) to C extension.
It improves the RBS file parsing performance up to 5 times faster. :rocket:

* There are some incompatibilities to drop obsolete syntax rules: `super` keyword and `any` type are no longer supported.
* [re2c](https://github.com/skvadrik/re2c) is used to generate lexical generator.

When you want to change the parser/lexer, change the files under `ext/rbs_extension` directory and run `rake compile` to compile the extension.

### Signature updates

* io/console ([\#783](https://github.com/ruby/rbs/pull/783))
* `ENV` -- Note that it introduces a dummy `::ENVClass` class, which is not defined in Ruby. ([\#812](https://github.com/ruby/rbs/pull/812))
* `Net::HTTPRequest` ([\#784](https://github.com/ruby/rbs/pull/784))
* `#clone` ([#811](https://github.com/ruby/rbs/pull/811), [\#813](https://github.com/ruby/rbs/pull/813))
* `Kernel#BigDecimal` ([\#817](https://github.com/ruby/rbs/pull/817))
* `Tempfile.new`, `Tempfile.create` ([\#792](https://github.com/ruby/rbs/pull/792), [\#791](https://github.com/ruby/rbs/pull/791))

### Library changes

* Replace `RBS::Parser` ([#788](https://github.com/ruby/rbs/pull/788), [#789](https://github.com/ruby/rbs/pull/789))
* Fix unexpected `CollectionNotAvailable` without `gems` from git source ([\#795](https://github.com/ruby/rbs/pull/795))
* Print deprecation warning ([\#801](https://github.com/ruby/rbs/pull/801))
* Make `Parser::KEYWORDS` a hash ([\#804](https://github.com/ruby/rbs/pull/804))
* Use _partial clone_ for `rbs collection` installer ([#805](https://github.com/ruby/rbs/pull/805))
* Respect logger level for test/setup logger ([\#819](https://github.com/ruby/rbs/pull/819), [\#822](https://github.com/ruby/rbs/pull/822))

## Miscellaneous

* Avoid a mixture of `Array#filter` and `Array#select` ([\#820](https://github.com/ruby/rbs/pull/820))
* Remove leftover documentation about `super` ([\#807](https://github.com/ruby/rbs/pull/807))

## 1.6.2 (2021-09-09)

### Signature updates

* `Enumerator::Lazy#force` ([\#782](https://github.com/ruby/rbs/pull/782))
* `IO.readlines` ([\#780](https://github.com/ruby/rbs/pull/780))

### Miscellaneous

* Set `$XDG_CACHE_HOME` during test ([\#781](https://github.com/ruby/rbs/pull/781))

## 1.6.1 (2021-09-05)

This is a minor release including test fixes.

### Miscellaneous

* Fix stdlib test for `Resolv::Hosts` by removing `/etc/hosts` dependency ([\#779](https://github.com/ruby/rbs/pull/779))
* Fix bundler related test for test-bundled-gems ([\#778](https://github.com/ruby/rbs/pull/778))

## 1.6.0 (2021-09-05)

This release includes a preview of `rbs collection` commands, which is _bundler for RBS_.
The command helps you manage RBS files from gem_rbs_collection or other repositories.

This feature is a preview, and any feedback is welcome!

### Signature updates

* objspace ([\#763](https://github.com/ruby/rbs/pull/763), [\#776](https://github.com/ruby/rbs/pull/776))
* tempfile ([\#767](https://github.com/ruby/rbs/pull/767), [\#775](https://github.com/ruby/rbs/pull/775))
* `IO#set_encoding_by_bom` ([\#106](https://github.com/ruby/rbs/pull/106))
* `OpenSSL::PKey::EC#dh_compute_key` ([\#775](https://github.com/ruby/rbs/pull/775))

### Library changes

* Add `rbs collection` ([\#589](https://github.com/ruby/rbs/pull/589), [\#772](https://github.com/ruby/rbs/pull/772), [\#773](https://github.com/ruby/rbs/pull/773))

### Miscellaneous

* Let `bin/annotate-with-rdoc` process nested constants/classes ([\#766](https://github.com/ruby/rbs/pull/766), [\#768](https://github.com/ruby/rbs/pull/768))
* Stop printing version mismatch message in CI ([\#777](https://github.com/ruby/rbs/pull/777))
* Update Steep and fix type errors ([\#770](https://github.com/ruby/rbs/pull/770), [\#774](https://github.com/ruby/rbs/pull/774))
* Add dependabot configuration ([\#771](https://github.com/ruby/rbs/pull/771))

## 1.5.1 (2021-08-22)

### Miscellaneous

* Fix Net_HTTP_test ([\#759](https://github.com/ruby/rbs/pull/759))

## 1.5.0 (2021-08-22)

This release includes stdlib signature updates.

### Signature updates

* digest ([\#744](https://github.com/ruby/rbs/pull/744), [\#757](https://github.com/ruby/rbs/pull/757))
* io-wait ([\#756](https://github.com/ruby/rbs/pull/756), [\#758](https://github.com/ruby/rbs/pull/758))
* `Ractor` ([\#755](https://github.com/ruby/rbs/pull/755))
* `File::Stat#size?` ([\#754](https://github.com/ruby/rbs/pull/754))
* `$-i`, `$0`, `$PROGRAM_NAME` ([\#753](https://github.com/ruby/rbs/pull/753))

## 1.4.0 (2021-08-19)

This release includes feature enhancements including recursive `type` definition validation, improved compatibility of global variable names, and various method type updates.

### Signature updates

* openssl ([\#743](https://github.com/ruby/rbs/pull/743))
* `Array`, `Enumerator`, `Enumerable`, `Hash`, `FalseClass`, `Float`, `Hash`, `Integer`, `Object`, `Range`, `TrueClass` ([\#728](https://github.com/ruby/rbs/pull/728))
* `Array#[]` ([\#732](https://github.com/ruby/rbs/pull/732))
* `Exception#set_backtrace` ([\#738](https://github.com/ruby/rbs/pull/738))
* `Kernel#Array` ([\#733](https://github.com/ruby/rbs/pull/733))
* `Kernel#spawn` ([\#748](https://github.com/ruby/rbs/pull/748))
* `Kernel#String` ([\#745](https://github.com/ruby/rbs/pull/745), [\#751](https://github.com/ruby/rbs/pull/751))
* `URI::Generic#fragment` ([\#752](https://github.com/ruby/rbs/pull/752))
* `URI::Generic#merge` ([\#746](https://github.com/ruby/rbs/pull/746))

### Language updates

* Add global variables signature ([\#749](https://github.com/ruby/rbs/pull/749))

### Library changes

* Add Recursive type alias definition validation ([\#719](https://github.com/ruby/rbs/pull/719))
* Generate included modules with complete name ([\#731](https://github.com/ruby/rbs/pull/731))
* Fix `rbs-prototype-rb` error when multi assign with const ([\#740](https://github.com/ruby/rbs/pull/740))

## 1.3.3 (2021-07-28)

This release includes a minor update of `resolv` library RBS and a fix of test for `ruby/ruby` CI.

### Signature updates

* resolv ([#726](https://github.com/ruby/rbs/pull/726))

## 1.3.2 (2021-07-23)

This release is to fix a bug introduced by parser update in 1.3.0.

* Fix parser to accept alias names starting with `_` ([#723](https://github.com/ruby/rbs/pull/723))

## 1.3.1 (2021-07-21)

This release is to fix a bug introduced by parser update in 1.3.0.

* Fix parser to accept param names starting with `_` ([#721](https://github.com/ruby/rbs/pull/721))

## 1.3.0 (2021-07-20)

### Summary

RBS 1.3.0 includes bug fixes of the parser and class/module definition validations.

### Signature updates

* dbm ([#718](https://github.com/ruby/rbs/pull/718))
* net-http ([#686](https://github.com/ruby/rbs/pull/686))
* optparse ([#693](https://github.com/ruby/rbs/pull/693))
* resolv ([#697](https://github.com/ruby/rbs/pull/697))
* socket ([#699](https://github.com/ruby/rbs/pull/699))
* `IO` ([#698](https://github.com/ruby/rbs/pull/698))
* `Marshal` ([#684](https://github.com/ruby/rbs/pull/684))
* `Mutex` ([#683](https://github.com/ruby/rbs/pull/683))
* `Array#shift` ([#707](https://github.com/ruby/rbs/pull/707))
* `BasicObject#method_missing` ([#707](https://github.com/ruby/rbs/pull/706), [#710](https://github.com/ruby/rbs/pull/710))
* `Kernel#caller` ([#705](https://github.com/ruby/rbs/pull/705))

### Library changes

* Interface names starting with lower case characters are now syntax error ([#678](https://github.com/ruby/rbs/pull/678), [#720](https://github.com/ruby/rbs/pull/720))
* Mixins of classes are rejected ([#681](https://github.com/ruby/rbs/pull/681))
* Generate prototype of `initialize` method with return type `void` ([#685](https://github.com/ruby/rbs/pull/685))
* Let `prototype runtime` generate class/module declarations in nested syntax ([#700](https://github.com/ruby/rbs/pull/700))
* Fix race condition for multi-thread support ([#702](https://github.com/ruby/rbs/pull/702))

### Miscellaneous

* Add new doc `docs/rbs_by_example.md` ([#694](https://github.com/ruby/rbs/pull/694))

## 1.2.1 (2021-05-27)

This release includes the following minor changes:

* Fix test to run the tests in ruby repository. ([#679](https://github.com/ruby/rbs/pull/679))
* Remove unnecessary files from the gem package. ([#675](https://github.com/ruby/rbs/pull/675))
* Suppress unused variable warning ([#674](https://github.com/ruby/rbs/pull/674))
* Update documents ([#672](https://github.com/ruby/rbs/pull/672))

## 1.2.0 (2021-04-21)

### Summary

RBS 1.2 ships with better support for AST/token locations and `Locator` utility class. The AST objects now keep the locations of tokens. The `Locator` class is to translate the text position (line and column) to semantic object at the location. The class allows to find if a text position is on the class name of a class declaration.

### Signature updates

* Hash ([#631](https://github.com/ruby/rbs/pull/631), [#632](https://github.com/ruby/rbs/pull/632), [\#637](https://github.com/ruby/rbs/pull/637), [\#638](https://github.com/ruby/rbs/pull/638), [\#639](https://github.com/ruby/rbs/pull/639), )
* Module ([\#645](https://github.com/ruby/rbs/pull/645))
* Enumerable ([\#647](https://github.com/ruby/rbs/pull/647))
* Array ([\#648](https://github.com/ruby/rbs/pull/648))
* Proc ([\#649](https://github.com/ruby/rbs/pull/649))
* Struct ([\#650](https://github.com/ruby/rbs/pull/650), [\#668](https://github.com/ruby/rbs/pull/668))
* Thread ([\#651](https://github.com/ruby/rbs/pull/651))
* Random ([\#669](https://github.com/ruby/rbs/pull/669))
* Shellwords ([\#665](https://github.com/ruby/rbs/pull/665))
* IO ([\#659](https://github.com/ruby/rbs/pull/659))

### Language updates

* Module self type syntax update ([\#653](https://github.com/ruby/rbs/pull/653))

### Library changes

* Token locations ([\#666](https://github.com/ruby/rbs/pull/666))
* Add RBS::Locator ([\#667](https://github.com/ruby/rbs/pull/667))
* Fix runtime type checker ([\#644](https://github.com/ruby/rbs/pull/644))

### Miscellaneous

* Update documentation for overloading ([\#658](https://github.com/ruby/rbs/pull/658))
* Update target ruby version ([\#633](https://github.com/ruby/rbs/pull/633))

## 1.1.1 (2021-03-12)

### Signature updates

* rubygem ([#630](https://github.com/ruby/rbs/pull/630))

## 1.1.0 (2021-03-08)

### Summary

Errors are now organized by `RBS::BaseError`, `RBS::ParsingError`, `RBS::LoadingError`, and `RBS::DefinitionError`.
The library users can rescue RBS related errors with `RBS::BaseError`, parsing errors with `RBS::ParsingError`, and other errors with `RBS::LoadingError` and `RBS::DefinitionErrors`.

Updating a part of environments are supported. Library users can remove declarations read from a set of files, adding new declarations, running name resolution related to the new decls, and deleting `DefinitionBuilder` caches related to the changes.
See `RBS::Environment#reject`, `RBS::Environment#resolve_type_names`, `RBS::AncestorGraph`, and `RBS::DefinitionBuilder#update`.

`RBS::DefinitionBuilder#build_singleton` now returns definitions containing `instance` type, which had returned resolved class instance types. This is a breaking change, but we consider it a bug fix because `RBS::DefinitionBuilder#build_instance` has returned `instance` types and `#build_singleton` has returned `class` type.

### Signature updates

* rubygem ([\#605](https://github.com/ruby/rbs/pull/605), [\#610](https://github.com/ruby/rbs/pull/610))
* Array ([\#612](https://github.com/ruby/rbs/pull/612), [\#614](https://github.com/ruby/rbs/pull/614))
* cgi/core ([\#599](https://github.com/ruby/rbs/pull/599))
* Thread ([\#618](https://github.com/ruby/rbs/pull/618))

### Language updates

* Allow trailing comma for Record and Tuple types ([\#606](https://github.com/ruby/rbs/pull/606))

### Library changes

* Allow partial update of RBS declarations ([\#608](https://github.com/ruby/rbs/pull/608), [\#621](https://github.com/ruby/rbs/pull/621))
* Let errors have `TypeName` ([\#611](https://github.com/ruby/rbs/pull/611))
* Add `Parser::LexerError` ([\#615](https://github.com/ruby/rbs/pull/615))
* Performance improvement ([\#617](https://github.com/ruby/rbs/pull/617), [\#620](https://github.com/ruby/rbs/pull/620))
* No substitute `instance` types on `#build_singleton` ([\#619](https://github.com/ruby/rbs/pull/619))

### Miscellaneous

* Make racc name customizable by `RACC` environment variable ([\#602](https://github.com/ruby/rbs/pull/602))
* Suppress warnings ([\#624](https://github.com/ruby/rbs/pull/624))
* Remove needless `Gem::Version` polyfill ([\#622](https://github.com/ruby/rbs/pull/622))

## 1.0.6 (2021-02-17)

* Signature Updates
  * `Enumerable` ([\#595](https://github.com/ruby/rbs/pull/595), [\#596](https://github.com/ruby/rbs/pull/596), [\#601](https://github.com/ruby/rbs/pull/601))
  * `#as_json` ([\#597](https://github.com/ruby/rbs/pull/597))

## 1.0.5 (2021-02-13)

* Signature Updates
  * Enumerable ([\#596](https://github.com/ruby/rbs/pull/596))
  * Set ([\#595](https://github.com/ruby/rbs/pull/595))
  * `#to_json` ([\#592](https://github.com/ruby/rbs/pull/592))
  * `<=>` ([\#593](https://github.com/ruby/rbs/pull/593))
  * Timeout ([\#586](https://github.com/ruby/rbs/pull/586))
  * URI::RFC2396_Parser ([\#587](https://github.com/ruby/rbs/pull/587))
* Rename generic class parameters on re-open ([\#594](https://github.com/ruby/rbs/pull/594))
* Make `refute_send_type` check that method call doesn't match with types in RBS ([\#588](https://github.com/ruby/rbs/pull/588))

## 1.0.4 (2021-01-31)

* Unbundle `rr` to run test in `ruby/ruby` repo ([#585](https://github.com/ruby/rbs/pull/585))

## 1.0.3 (2021-01-28)

* Set up `#ancestors` and `#location` of `RecursiveAncestorError` ([#583](https://github.com/ruby/rbs/pull/583))

## 1.0.2 (2021-01-28)

* Signature Updates
  * Kernel([#582](https://github.com/ruby/rbs/pull/582))

## 1.0.1 (2021-01-27)

* Signature Updates
  * PrettyPrint ([\#573](https://github.com/ruby/rbs/pull/573))
  * FileUtils ([\#576](https://github.com/ruby/rbs/pull/576))
  * UnboundMethod ([\#555](https://github.com/ruby/rbs/pull/555))
  * IO ([\#571](https://github.com/ruby/rbs/pull/571))
  * Kernel ([\#549](https://github.com/ruby/rbs/pull/549), [\#569](https://github.com/ruby/rbs/pull/569))
  * File ([\#552](https://github.com/ruby/rbs/pull/552))
  * Data is removed ([\#570](https://github.com/ruby/rbs/pull/570))
  * Module ([\#568](https://github.com/ruby/rbs/pull/568))
  * Object ([\#557](https://github.com/ruby/rbs/pull/557))
* Renew test sample code ([#581](https://github.com/ruby/rbs/pull/581))
* Add description to `generate:stdlib_test` Rake task ([\#578](https://github.com/ruby/rbs/pull/578))
* Declare supported ruby version >= 2.6 ([\#548](https://github.com/ruby/rbs/pull/548))
* Fix module self-type override ([\#577](https://github.com/ruby/rbs/pull/577))
* Fix parser to support all operator symbols ([\#550](https://github.com/ruby/rbs/pull/550))
* Migrate from Minitest to Test::Unit ([\#556](https://github.com/ruby/rbs/pull/556))
* Fix type alias parsing ([\#565](https://github.com/ruby/rbs/pull/565))
* Support end-less method definition in `prototype rb` ([\#561](https://github.com/ruby/rbs/pull/561))
* Support method argument forwarding in `prototype rb` ([\#560](https://github.com/ruby/rbs/pull/560))

## 1.0.0 (2020-12-24)

* Signature updates for `URI`, `IO`, `File`, `Pathname`, `Module`, and `Time` ([#529](https://github.com/ruby/rbs/pull/529), [#521](https://github.com/ruby/rbs/pull/521), [#520](https://github.com/ruby/rbs/pull/520), [#511](https://github.com/ruby/rbs/pull/511), [#517](https://github.com/ruby/rbs/pull/517), [#542](https://github.com/ruby/rbs/pull/542), [#546](https://github.com/ruby/rbs/pull/546), [#540](https://github.com/ruby/rbs/pull/540), [#538](https://github.com/ruby/rbs/pull/538))
* `rbs prototype runtime` generates `extend`s ([#535](https://github.com/ruby/rbs/pull/535))
* `rbs prototype runtime` stability improvements ([#533](https://github.com/ruby/rbs/pull/533), [#526](https://github.com/ruby/rbs/pull/526))
* `rbs prototype rb` compatibility improvements ([#545](https://github.com/ruby/rbs/pull/545))
* Implement method names escape in `RBS::Writer` ([#537](https://github.com/ruby/rbs/pull/537))
* Improve runtime type checker compatibility ([#532](https://github.com/ruby/rbs/pull/532), [#528](https://github.com/ruby/rbs/pull/528), [#547](https://github.com/ruby/rbs/pull/547))
* Fix `ruby2_keywords` for `Proc` in Ruby <2.7 ([#513](https://github.com/ruby/rbs/pull/513))
* Better compatibility for record type attribute names ([#525](https://github.com/ruby/rbs/pull/525), [#524](https://github.com/ruby/rbs/pull/524))
* Let module self-types be classes ([#523](https://github.com/ruby/rbs/pull/523))
* Delete `extension` syntax ([#543](https://github.com/ruby/rbs/pull/543))
* Method resolution improvements about `alias` and `.new` ([#522](https://github.com/ruby/rbs/pull/522), [#519](https://github.com/ruby/rbs/pull/519), [#516](https://github.com/ruby/rbs/pull/516))
* Better message for `DuplicatedMethodDefinitionError` ([#539](https://github.com/ruby/rbs/pull/539))

## 0.20.1 (2020-12-06)

* Make the order of RBS load reproducible ([#508](https://github.com/ruby/rbs/pull/508))

## 0.20.0 (2020-12-06)

* Signature updates for `TSort`, `DBM`, `Time`, and `Hash` ([#496](https://github.com/ruby/rbs/pull/496), [#497](https://github.com/ruby/rbs/pull/497), [#499](https://github.com/ruby/rbs/pull/499), [#507](https://github.com/ruby/rbs/pull/507))
* Add _singleton attribute_ syntax ([#502](https://github.com/ruby/rbs/pull/502), [#506](https://github.com/ruby/rbs/pull/506), [#505](https://github.com/ruby/rbs/pull/505))
* Proc types with blocks ([#503](https://github.com/ruby/rbs/pull/503))
* Add support for escape sequences in string literal types ([#501](https://github.com/ruby/rbs/pull/501))
* Fix runtime type checking of blocks with keyword args ([#500](https://github.com/ruby/rbs/pull/500))

## 0.19.0 (2020-12-02)

* Signature updates for `Monitor` and File ([#485](https://github.com/ruby/rbs/pull/485), [#495](https://github.com/ruby/rbs/pull/495))

## 0.18.1 (2020-12-01)

* Fix `EnvironmentWalker#each_type_name` ([#494](https://github.com/ruby/rbs/pull/494))

## 0.18.0 (2020-12-01)

* Signature updates for `YAML`, `ObjectSpace`, and `Singleton` ([#408](https://github.com/ruby/rbs/pull/408), [#477](https://github.com/ruby/rbs/pull/477), [#482](https://github.com/ruby/rbs/pull/482))
* `prototype rb` improvements ([#492](https://github.com/ruby/rbs/pull/492), [#487](https://github.com/ruby/rbs/pull/487), [#486](https://github.com/ruby/rbs/pull/486), [#481](https://github.com/ruby/rbs/pull/481))
* Runtime type checker improvements ([#488](https://github.com/ruby/rbs/pull/488), [#489](https://github.com/ruby/rbs/pull/489), [#490](https://github.com/ruby/rbs/pull/490))
* Update `DependencyWalker` API to receive _Node_ objects instead of `TypeName` ([#484](https://github.com/ruby/rbs/pull/484))
* Assume encoding of RBS files to be UTF-8 ([#493](https://github.com/ruby/rbs/pull/493))

## 0.17.0 (2020-11-14)

* Signature updates for `Enumerable`, `Hash`, and `TSort` ([#462](https://github.com/ruby/rbs/pull/462), [#468](https://github.com/ruby/rbs/pull/468), [#471](https://github.com/ruby/rbs/pull/471), [#472](https://github.com/ruby/rbs/pull/472), [#473](https://github.com/ruby/rbs/pull/473), [#474](https://github.com/ruby/rbs/pull/474))
* Parser error handling improvement ([#463](https://github.com/ruby/rbs/pull/463), [#475](https://github.com/ruby/rbs/pull/475))
* Hash spread syntax handling improvement with `prototype rb` ([#465](https://github.com/ruby/rbs/pull/465))

## 0.16.0 (2020-11-05)

* Signature update for `DBM` ([#441](https://github.com/ruby/rbs/pull/441))
* RBS repository ([#405](https://github.com/ruby/rbs/pull/405))
* Support `alias` in `rbs prototype rb` ([#457](https://github.com/ruby/rbs/pull/457))

## 0.15.0 (2020-11-02)

* Signature updates for `Kernel`, `PStore`, `Enumerable`, and `Array` ([#450](https://github.com/ruby/rbs/pull/450), [#443](https://github.com/ruby/rbs/pull/443), [#438](https://github.com/ruby/rbs/pull/438), [#437](https://github.com/ruby/rbs/pull/437), [#433](https://github.com/ruby/rbs/pull/433), [#432](https://github.com/ruby/rbs/pull/432))
* Add helper interfaces ([#434](https://github.com/ruby/rbs/pull/434), [#428](https://github.com/ruby/rbs/pull/428))
* Change `bool` type semantics ([#456](https://github.com/ruby/rbs/pull/456))
* Support alias in `rbs prototype rb` ([#457](https://github.com/ruby/rbs/pull/457))
* Runtime testing improvements ([#455](https://github.com/ruby/rbs/pull/455), [#447](https://github.com/ruby/rbs/pull/447), [#444](https://github.com/ruby/rbs/pull/444), [#431](https://github.com/ruby/rbs/pull/431))
* Fix proc type parsing ([#451](https://github.com/ruby/rbs/pull/451))
* Fix type variable parsing ([#442](https://github.com/ruby/rbs/pull/442))


## 0.14.0 (2020-10-17)

* Allow keyword names ending with `?` and `!` ([#417](https://github.com/ruby/rbs/pull/417))
* Make `Range[T]` covariant ([#418](https://github.com/ruby/rbs/pull/418))

## 0.13.1 (2020-10-09)

* Fix test for CI of ruby/ruby ([#412](https://github.com/ruby/rbs/pull/412))

## 0.13.0 (2020-10-09)

* Signature updates for `URI` classes.
* Fix tests ([#410](https://github.com/ruby/rbs/pull/410))
* Add `--silent` option for `rbs validate` ([#411](https://github.com/ruby/rbs/pull/411))

## 0.12.2 (2020-09-17)

* Minor signature update for `pty`
* Fix `PTY` stdlib test

## 0.12.1 (2020-09-16)

This version is to improve Ruby 3 testing compatibility. Nothing changed for users.

## 0.12.0 (2020-09-15)

* Signature updates for `forwardable`, `struct`, `set`, `URI::Generic`, `URI::File`, and `BigDecimal`.
* Define `.new` methods from `initialize` included from modules [#390](https://github.com/ruby/rbs/pull/390)

## 0.11.0 (2020-08-31)

* Signature update for `date/datetime` [#367](https://github.com/ruby/rbs/pull/367)
* Add test double support for runtime type checker [#380](https://github.com/ruby/rbs/pull/380)
* Add `rbs test` command for runtime type checking [#366](https://github.com/ruby/rbs/pull/366)
* Fix runtime type checking for record types [#365](https://github.com/ruby/rbs/pull/365)
* Improve EnvironmentLoader API [#370](https://github.com/ruby/rbs/pull/370)
* Allow overloading from super methods [#364](https://github.com/ruby/rbs/pull/364)

## 0.10.0 (2020-08-10)

* Signature update for `Zlib`
* Make "no type checker installed" message a debug print [#363](https://github.com/ruby/rbs/pull/363)
* Print `...` for overloading method definitions [#362](https://github.com/ruby/rbs/pull/362)
* Allow missing method implementation in Ruby code [#359](https://github.com/ruby/rbs/pull/359)
* Runtime testing improvements [#356](https://github.com/ruby/rbs/pull/356)

## 0.9.1 (2020-08-04)

* Ensure using Module#name [#354](https://github.com/ruby/rbs/pull/354)
* Fix runtime test setup [#353](https://github.com/ruby/rbs/pull/353)

## 0.9.0 (2020-08-03)

* Fix signature validation [#351](https://github.com/ruby/rbs/pull/351), [#352](https://github.com/ruby/rbs/pull/352)
* Parsing performance improvement [#350](https://github.com/ruby/rbs/pull/350)

## 0.8.0 (2020-08-01)

* Signature updates for `Enumerator` and `PTY`
* Fix prototype rb/rbi error handling [#349](https://github.com/ruby/rbs/pull/349)
* Runtime test improvements [#344](https://github.com/ruby/rbs/pull/344), [#343](https://github.com/ruby/rbs/pull/343)
* Add `...` syntax [#342](https://github.com/ruby/rbs/pull/342)

## 0.7.0 (2020-07-20)

* Add `DefinitionBuilder#one_instance_ancestors` and `DefinitionBuilder#one_singleton_ancestors` [#341](https://github.com/ruby/rbs/pull/341)
* Bug fix in ConstantTable [#340](https://github.com/ruby/rbs/pull/340)
* Make `rbs validate` faster [#338](https://github.com/ruby/rbs/pull/338)
* Dedup methods generated by `rbs prototype rb` [#334](https://github.com/ruby/rbs/pull/334)

## 0.6.0 (2020-07-12)

* Signature update for `Logger`.
* Clean `Environment#inspect`. [#331](https://github.com/ruby/rbs/pull/331)
* Module self type syntax update. [#329](https://github.com/ruby/rbs/pull/329)
* Better validation. [#328](https://github.com/ruby/rbs/pull/328)
* Parser performance improvement. [#327](https://github.com/ruby/rbs/pull/327)
* Runtime type checking performance improvements with sampling [#323](https://github.com/ruby/rbs/pull/323)

## 0.5.0 (2020-07-04)

* Signature updates for `Mutex_m`, `IO`, and `Enumerable`.
* Syntax update. [#307](https://github.com/ruby/rbs/pull/307)
* AST command prints _absolute_ type names with file name filtering. [#312](https://github.com/ruby/rbs/pull/312)
* Improve CLI message. [#309](https://github.com/ruby/rbs/pull/309)

## 0.4.0 (2020-06-15)

* Signature update for `Fiber`, `Encoding`, and `Enumerator`.
* Fix syntax error for underscore and `!` `?` [#304](https://github.com/ruby/rbs/pull/304)
* Improved return type inference in `rbs prototype rb` [#303](https://github.com/ruby/rbs/pull/303)
* Skip anonymous modules/classes in `rbs prototype runtime` [#302](https://github.com/ruby/rbs/pull/302)
* Fix `--require-relative` option in `rbs prototype runtime` [#299](https://github.com/ruby/rbs/pull/299)
* Add JSON schema for `rbs ast` [#295](https://github.com/ruby/rbs/pull/295)

## 0.3.1 (2020-05-22)

* Fix constant resolution again [#289](https://github.com/ruby/rbs/pull/289)

## 0.3.0 (2020-05-20)

* Fix constant resolution [#288](https://github.com/ruby/rbs/pull/288)

## 0.2.0

* The first release of RBS gem.

## 0.1.0

* Version 0.1.0 is the original `rbs` gem and it is different software from RBS.
