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Change Log

# v6.1.3

- [bugfix] add support for TypeScript 4.0 peer dependency (#4943)

# v6.1.2

- [bugfix] restore typings compatibility with TS < 3.8 (#4933)

# v6.1.1

- [bugfix] upgrade mkdirp dependency to `^0.5.3` (#4918)

# v6.1.0

- [enhancement] Upgrade to TypeScript 3.8, support new syntax (#4915)
- [docs]`no-object-literal-type-assertion` fix typo in rule description (#4911)

Thanks to our contributors!

- Daniel Zwelling
- Ryan Delaney

# v6.0.0

This version has been marked as deprecated on NPM to encourage users to migrate to ESLint.

- [bugfix] fix `enforce-trailing-newline` option in `file-header` rule (#4890)
- [bugfix] avoid writing to temp files with `writeFileSync` on macOS 10.15 (#4887)
- [bugfix] fix crash in `completed-docs` rule when tag contents are undefined (#4895)
- [docs] fix example code of Radix rule (#4892)
- [docs] Add missing colon after `[error]` in testing rules documentation (#4903)

Thanks to our contributors!

- Ivan Sorokin
- Tanmoy Bhowmik
- Meng Wang
- Jay Bhagat
- Aman Sharma
- Josh Goldberg

# v6.0.0-beta1

No changes from v6.0.0-beta0, just re-released to correctly mark with the `beta` and `next` dist-tags on NPM.

# v6.0.0-beta0

- :fire: BREAKING CHANGES :fire:
  - [api] Changed default formatter to stylish (#4872)
  - [enhancement] Removed formatting and whitespace rules from `tslint:recommended` configuration (#4871)
  - [enhancement] Removed pedantic rules from `tslint:recommended` configuration (#4312)
  - [enhancement] `vso` formatter now reports severity of rule failures (#4286)
  - [enhancement]`typedef` rule `arrow-call-signature` option is more consistent in reporting errors on lambdas and will flag more violations that were missed in the previous rule implementation (#4533)
  - [bugfix]`ordered-imports` is now consistent with TypeScript's Organise Imports ordering (#4064)
  - [bugfix]`member-ordering` now checks property accessors (getters and setters) (#3984)
- Other changes
  - [bugfix] Removed deprecated rules from `tslint:all` configuration (#4862)
  - [bugfix] Preserve significant zeros in fixer for number-literal-format (#4856)
  - [bugfix]`no-redundant-jsdoc` allow `@author` tag (#4854)
  - [bugfix] `RuleFailure#toJson()` no longer forces rule severity to be an uppercase string (#2622)
  - [bugfixfix]`return-undefined` rule now works with TS 3.7 (#4866)
  - [enhancement]`prefer-switch` is more lenient with `if` statements containing multiple OR conditions without any `else` clause (#4873)
  - [enhancement]`completed-doc`: add support for constructor documentation (#4861)
  - [new-rule-option] `case-insensitive-legacy` for `ordered-imports` rule (#4064)
  - [docs]`import-blacklist`: add some options examples (#4858)
  - [docs] Update custom rule example to use recursive walker (#4883)

Thanks to our contributors!

- J Rob Gant
- Tanmoy Bhowmik
- 谭九鼎
- Ahmed Ghoneim
- Josh Goldberg
- Andrew Boyton
- Peter Sandor
- Vincent Langlet
- Adrian Leonhard
- Philipp Foedermayr
- Brian Olore
- andrew bernard
- joon1030

# v5.20.1

No changes from v5.20.0, just re-released to correctly mark with the `latest` dist-tag on NPM.

# v5.20.0

- [bugfix] fix `strict-boolean-expressions` false positive with `"ignore-rhs"` option (#4833)
- [bugfix] fix `no-unnecessary-type-assertion` no error when `"strict": true` in compiler flags (#4841)
- [bugfix] "ignore" option for `file-name-casing` rule works correctly (#4848)
- [bugfix] fix `array-type` false positive for simple parenthesized types with "array-simple" option (#4844)
- [new-rule-option]`object-literal-shorthand` supports `{"property"?: "never", "method"?: "never"}` as config options (#4842)
- [new-rule-option]: `allow-generics` option for `invalid-void` rule (#4839)
- [new-rule-option] `check-super-calls` option for `unnecessary-constructor` rule (#4813)
- [chore] Upgrade `diff` dependency to v4.0.1 (#4845, #4852)

Thanks to our contributors!

- Bas Bosman
- Tanmoy Bhowmik
- David Zulaica
- Maxime Kjaer
- @guidsdo
- Pavel Birukov
- Josh Goldberg
- Akshaya Srivatsa

# v5.19.0

- [bugfix] relax `promise-function-async` for short parenthesized arrow functions (#4765)
- [bugfix] fix `no-async-without-await` false positive for abstract methods (#4782)
- [bugfix] fix `strict-comparisons` false positive for `null` and `undefined` literals (#4786)
- [bugfix] improve `no-angle-bracket-type-assertion` autofix semantics with more parentheses (#4823)
- [enhancement] add BigInt support to `restrict-plus-operands` rule (#4814)
- [enhancement]`await-promise` now supports new TypeScript 3.6 AST API symbols for async iterators (#4800)
- [new-rule-option] `check-strings` and `check-regex` options for `max-line-length` rule (#4798)
- [new-rule-option] `variable-declaration-ignore-function` option for `typedef` rule (#4769)
- [new-rule-option] `ignore-blank-lines` option for `object-literal-sort-keys` rule (#4808)
- [new-rule]`no-for-in` (#4747)
- [new-rule]`invalid-void` (#4736)
- [new-rule]`strict-string-expressions` reports errors on type coercions found in string expressions (#4807)
- [new-rule]`no-promise-as-boolean` (#4790)
- [docs] link to OSS fellowship medium post in README (#4821)

Thanks to our contributors!

- Josh Pike
- Tanmoy Bhowmik
- Michael Withagen
- Evgeniy Timokhov
- Vitalij Krotov
- Josh Goldberg
- Veda
- Guido
- Robert Fink
- Max Sysoev

# v5.18.0

- [feature] New `--print-config` CLI flag (#4744)
- [bugfix]`no-unnecessary-type-assertion` no longer flags `x!` non-null assertions if `--strictNullChecks` is not enabled (#3724)
- [bugfix]`quotemark` handles unbalanced quotes more gracefully without crashing (#4344)
- [docs] Add tslint-playground link to README and bug report template (#4150)
- [enhancement]`no-magic-numbers` rule ignores arguments passed into default Number methods (#3668)
- [new-fixer]`comment-format` (#3583)
- [new-rule-option] `"allow-trailing-lowercase"` option for `comment-format` rule (#3583)
- [new-rule-option] `"ignore-accessors"` for `adjacent-overload-signatures` to ignore getters / setters overloads (#3718)
- [new-rule]`no-async-without-await` (#3945)
- [new-rule]`strict-comparisons` (#4519)

Thanks to our contributors!

- Josh Goldberg
- smoehrle
- Mateusz Witkowski
- Andy Hanson
- John Wiseheart
- Eran Shabi
- Tibor Blenessy
- AndreasGassmann
- Ryan Waskiewicz
- Isabelle

# v5.17.0

- [bugfix]`quotemark` backtic option now ignores enum members, use strict declarations, lookup types, and strings containing octal escape sequences. (#4693)
- [bugfix]`no-redundant-jsdoc` no longer errors on `JSDocThisTag` (#4690)
- [chore] Update devDependency mocha from v3.2.0 to v6.1.4 (#4669) (#4674)
- [chore] Update devDependency js-yaml from ^3.13.0 to ^3.13.1 (#4663)
- [chore] Update deprecated devDependency github to @octokit/rest (#4673)
- [chore] Update devDependency nyc from v13.3.0 to v14.1.1 (#4699)
- [deprecation]`no-use-before-declare` rule for typescript >= 2.9.0 (#4695)
- [documentation] Minor fix for `variable-name` rule metadata (#4731)
- [documentation] Fixed `no-unused-variable` argument count (#4683)
- [enhancement] Allow const assertions in `no-object-literal-type-assertion` (#4681)
- [new-fixer]`unnecessary-constructor` (#4694)

Thanks to our contributors!

- Bjorn Stromberg
- Vitaliy Agoshkov
- knafteN
- Bowen Ni
- Waseem Ahmad
- Åsmund Grammeltvedt
- Eric Ferreira
- Zhen Tian
- Tom Lakesman
- zachkirsch

# v5.16.0

- [bugfix] Excuse more `quotemark` backtick edge cases and fix behavior for TS < 2.7.1 (#4642)
- [bugfix] Fix regression in `interface-name` rule related to numeric characters in interface names (#4655, #4626)
- [enhancement] Update `nyc` from v10.2.0 to v13.3.0 (#4633)
- [enhancement] Migrate from deprecated babel-code-frame package to new @babel/code-frame package (#4632)
- [enhancement] Improve error message for `restrict-plus-operands` rule. (#4635)
- [enhancement]`comment-format` rule now whitelists `//region` comments generated by JetBrains IDE (#4609)
- [enhancement] Relax `no-null-undefined-union` rule. (#4625)
- [new-rule-option] `allow-else-if` option for `unnecessary-else` rule (#4599)
- [documentation] Fix "identifer" typo in custom rules docs (#4657)
- [documentation] Fix code example for `switch-default` rule (#4650)
- [documentation] Fix documentation example for prose formatter (#4656)
- [documentation]`no-parameter-properties`: fix unclear rule description (#4629)
- [documentation] Fix typo in rule docs generation (#4638)

Thanks to our contributors!

- Oleg Artene
- William Neely
- Bjorn Stromberg
- Matthew Barry
- Neha Rathi
- Vincent Langlet
- rarenal
- Greg Jednaszewski
- Adam Postma
- Eric Ferreira
- Evgeniy Timokhov
- Martin Probst

# v5.15.0

- [api] `WalkContext` and `AbstractWalker` type parameter defaults to `void` (#2600)
- [bugfix]`no-void-expression` now allows conditional expressions (#4606)
- [bugfix] fix linebreak handling in `ordered-imports` (#4583)
- [bugfix] fix `static-this` false positive for higher order components (#4580)
- [bugfix] Fixed crash in `unnecessary-else` from blank `if` statements (#4603)
- [bugfix] Fixed false positive in `unnecessary-else` after non-jumping statement (#4603)
- [bugfix]`interface-name` now handles interface starting with "I18n" correctly (#4486)
- [bugfix]`no-string-throw` fix inserts whitespace if not present after `throw` keyword (#4540)
- [bugfix]`quotemark`: fix some edge cases for `backtick` option (#4618)
- [bugfix]`unnecessary-constructor`: don't flag non-private constructors that are actually necessary (#4619)
- [enhancement] Upgrade js-yaml to avoid security issue (#4595)
- [new-rule-option] `allow-single-line-comments` option for `file-header` rule (#4560)
- [new-rule-option] `ignore-rest-args` option for `no-any` rule (#4581)
- [new-rule]`no-null-undefined-union` (#4589)

Thanks to our contributors!

- Max Belsky
- Steve Moser
- Christian Flach
- Roman Rogowski
- Terry
- Luke
- Andy Hanson
- Vitalij Krotov
- Josh Goldberg
- Vincent Langlet
- Neha Rathi
- Eric Ferreira

# v5.14.0

- [bugfix] `backtick` option for `quotemark` rule no longer incorrectly flags string literals that must use single/double quotes (#4535)
- [bugfix] Fixed regression in CheckstyleFormatter backwards compatibility (#4561)
- [bugfix]`whitespace` rule now lints export statements (#4554)
- [bugfix]`no-trailing-whitespace` no longer flags files starting with a byte order mark (#4543)
- [enhancement]`promise-function-async` now allows single statement lamda functions that delegate to another promise-returning function (#4553)
- [enhancement] Add note to docs about zero-indexing for machine formatters (#4544)
- [enhancement] Fix metadata of the `whitespace` rule (#4551)
- [enhancement] Add junit output for files which are successfully linted (#4566)
- [new-rule-option] `underscore` option for `no-shadowed-variable` rule to ignore shadowed underscores (#4546)
- [new-rule-option] `require-const-for-all-caps` option for `variable-name` rule (#2936)
- [new-rule-option] `overloads` option for `completed-docs` rule to enforce documentation of each overload signature (#4563)
- [new-rule-option] `allow-namespace-imports` option for `no-duplicate-imports` rule (#4524)
- [new-rule-option] `allow-arguments` option for `no-object-literal-type-assertion` rule to allow type assertions on object literals used inside call expressions (#4521)
- [new-rule-option] `allow-delete` option for `no-unbound-method` rule (#4548)
- [new-rule]`no-tautology-expression` (#4470)
- [new-rule]`static-this` (#4475)
- [new-rule]`unnecessary-else` (#4502)

Thanks to our contributors!

- Roman Rogowski
- Max Belsky
- Edward Drapkin
- Dominik Palo
- Matthew McCune
- Debsmita
- Lucas Charles
- Piotr Gajowniczek
- Darren Anderson
- Noam Yogev
- Josh Goldberg
- Karol Majewski

# v5.13.1

- [bugfix] Fix regression in CheckstyleFormatter backwards compatibility (#4561)

# v5.13.0

- [deprecation] Mark `RuleWalker` and `ProgramAwareRuleWalker` as deprecated (#4413)
- [bugfix] Create output directory when the output path (specified by `--out` CLI flag) does not exist. (#4507)
- [bugfix] Explicit disabling of rules is now copied over to jsRules when using `jsRules: true` (#4517)
- [bugfix] `unknown` is recognized as simple type in `array-type` (#4433)
- [bugfix]`ban`: Fix a false positive which would occur when banning method calls nested inside objects. Previously, banning `["a", "b", "c"]` would trigger lint failures on the syntax `b.c()`, which was not the intent of this rule. (#4383)
- [bugfix] Fixed single-line comment parsing for completed-docs (#3557)
- [bugfix]`trailing-comma` no longer crashes if it cannot find the closing parenthesis of a function declaration (#4457)
- [bugfix]`no-unsafe-any`: allow implicitly downcasting `any` to `unknown` (#4442)
- [bugfix] Add `grouped-imports` to `tslint:all` (#4420)
- [docs] Fix docs typo (#4395)
- [enhancement] Add "formatting" rule category (#2832)
- [enhancement]`ordered-imports` now supports a groups option to provide custom grouping rules. (#4134)
- [enhancement] Convert `completed-docs` to an untyped rule (#3557)
- [enhancement] Checkstyle formatter includes every file linted regardless of lint errors. (#3838)
- [enhancement] Formatters now receive the full list of of linted file paths as a third argument. (#3838)
- [enhancement]`array-type` rule handles Typescript 3.0's unknown type properly (#4219)
- [enhancement]`import-blacklist` now supports regular expression patterns for blacklisting (#3504)
- [new-rule] `no-restricted-globals` (#3824)
- [new-fixer] added fixer for `newline-before-return` rule (#4482)
- [new-fixer]`number-literal-format` now includes auto fix (#4496)
- [new-rule-option] Added `whitelist` option to `no-unbound-method` (#4472)
- [new-rule-option] Added `jsx-ignore` option to `no-magic-numbers` rule (#4460)
- [new-rule-option]: `object-literal-sort-keys`: Add `match-declaration-order-only` option (#3748)
- [new-rule-option]`strict-boolean-expressions` accepts `ignore-rhs` option to disable checking the right-hand side of the `&&` and `||` operators as strictly boolean. (#4159)

Thanks to our contributors!

- Enes SOYLU
- jbsingh
- Sven Efftinge
- James C. Davis
- Norio Suzuki
- Thomas den Hollander
- Retsam
- Dobes Vandermeer
- Young Min Kim
- Grant Wu
- Felix Schindler
- Lydia
- Adrian Leonhard
- James Jensen
- Athene Noctua
- Allen
- Vincent Langlet
- Paul Medynski
- Liz
- Piotr Gajowniczek
- Max Sysoev
- Jakub Beneš
- Ian Mobley
- 周昊宇
- Nazanin Delam
- Matt R. Wilson
- Andy Hanson
- Zen
- Josh Goldberg
- Jeff Lau

# v5.12.1

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix] Revert breaking change to tslint:recommended, update tslint:latest (#4404)
- [bugfix] Correcting fixer for the `increment-decrement` rule (#4415)
- [bugfix] Fix `strict-type-predicates` with `unknown` (#4444)
- [bugfix] Skip linting of `.json` files to avoid problems with `--resolveJsonModule` compiler option (#4001)
- [bugfix] fix some `quotemark` issues when using backticks with the `avoid-template` option (#4408)
- [enhancement] Mention file names in test script parse failures (#4397)

Thanks to our contributors!

- Young Min Kim
- Enes SOYLU
- Thomas den Hollander
- Adrian Leonhard

# v5.12.0

# :tada: Features

- [feature] Configure format from file (#4155)
- [feature] Make cli expect array for rules dir (#3788)
- [feature] Set js rules to all valid active rules (#3641)
- [improvement] Add tests for typescript@2.9 and typescript@3.0 (#4053)
- [new-fixer]`type-literal-delimiter` (#3964)
- [new-rule-option]`whitespace` Add whitespace rule for open braces (#4068)
- [new-rule-option]`file-name-casing`: Add file name whitelist (#4206)
- [new-rule-option]`object-literal-sort-keys`: `locale-compare` (#4193)
- [new-rule-option]`strict-boolean-expressions` adds `allow-enum` to allow using enums in boolean expressions (#3604)
- [new-rule-option]`import-blacklist`: support blacklisting specific named exports (#3926)
- [new-rule-option]`type-literal-delimiter`: Add `{ singleLine: "always" | "never"}` (#3964)
- [new-rule-option]`file-name-casing`: Add `snake-case` option (#4081)
- [new-rule-option]`file-header`: Enforce Blank Line after File Header (#3740)
- [new-rule]`ban-ts-ignore` (#3728)
- [new-rule]`function-constructor` (#4198)
- [new-rule]`increment-decrement` (#3575)
- [new-rule]`no-default-import` (#4023)
- [new-rule]`unnecessary-constructor` (#3647)
- [new-rule]`comment-type` (#4008)
- [new-rule]`unnecessary-bind` (#3588)

# :hammer_and_wrench: Bugfixes & enhancements

- [api] Allow `exclude` to work with node API (#4143)
- [api] Upgrade TSLint to support TS 3.1 (#4274)
- [bugfix] Allow whitelisted modules to start with `@` symbol (#4192)
- [bugfix] Added exception for generators in `return-undefined` rule (#4370)
- [bugfix] Allow unknown in 'no-object-literal-type-assertion' rule. (#4362)
- [bugfix] Completed docs rule can check single-line comments (#3841)
- [bugfix]`prefer-method-signature`: Correct the auto-fix code of rule, now capable to handle multiline signature. (#4066)
- [bugfix] Default logger.error should log to stderr. (#3982)
- [bugfix] Fixes an issue where TSLint doesn't correctly resolve packages in a `node_modules` folder that are symlinked to another location where their dependencies are satisfied. (#4295)
- [bugfix] Fix configuration tests when comparing rules (#4346)
- [bugfix] Fix semicolon: Cannot read property 'initializer' of undefined (#4351)
- [bugfix] Fix whitespace rule in importClause with 'as' statement (#4249)
- [bugfix]`no-invalid-this`: fixes false positives on method-like syntax and false negatives on nested functions (#4034)
- [bugfix]`one-line`: Check block in a case clause (#3619)
- [bugfix]`whitespace` Don't require space between import and paren with in type imports (#4243)
- [bugfix] remove `no-unused-variable` from `tslint:all` (#4079)
- [bugfix]`callable-types` support interfaces containing a single construct signature (#4291) (#4352)
- [bugfix]`ordered-imports`: Setting `import-sources-order: any` no longer invalidates `grouped-imports: true` (#4374)
- [develop] Add issue templates (#4028)
- [develop] Add test for 3.0 (#4119)
- [develop] Changes the node version from 4 to 6 for TS 2.1 tests. (#4282)
- [develop] Fix prettier command in package.json (#4275)
- [develop] Fix semantic merge break from #4374 and #3733 (#4378)
- [develop] Fix typo in launch.json (#4287)
- [develop] Prettier (#4012)
- [develop] Re-ran Prettier on source files again, with some more ignores (#4270)
- [develop] Update 'json-stringify-pretty-compact' to 1.2.0 and remove unnecessary type declaration (#4371)
- [develop] Upgrade prettier and run over all files (#4214)
- [docs] "< 0" means less than zero, not greater than (#4183)
- [docs] Added badges for dependencies status (#4160)
- [docs] Additional code examples for rules (#3869)
- [docs] Clarify no-shadowed-variable doc (#4347)
- [docs] Fix docs typo (#4165)
- [docs] Fix docs typo (#4182)
- [docs] Fix typo in index.md (#4242)
- [docs] Fix typos in formatter descriptions (#4288)
- [docs] Fixed typo in documentation (#4047)
- [docs] Includes new name Azure DevOps for VSO (#4289)
- [docs] Typo correction in no-unused-expression (#4322)
- [docs] Update documentation to reflect changes made in #2229. (#4336)
- [docs] Update stylish example (#4095)
- [docs] Use latest docs deps to avoid vulnerable libs (#4366)
- [docs] prefer-object-spread: this is new to ES2018, not ES2015 (#4321)
- [documentation] Update configuration documentation to include array syntax (#4258)
- [enhancement] Add `homepage` to package.json (#4101)
- [enhancement] Add esSpecCompliant: true to recommended trailing-comma config (#4072)
- [enhancement] Add new tests to workflows (#4054)
- [enhancement] Add quiet flag to hide warnings (#4025)
- [enhancement] Don't flag unmatched ${ in no-invalid-template-strings (#3769)
- [enhancement] Show offending value in 'no-magic-numbers' error message (#4332)
- [enhancement]`ordered-imports`: When `grouped-imports` option of the rule is set, the fact that imports of the same type are all in one group is also checked. (#3733)
- [enhancement] Yaml parser now uses default schema, allowing for `<<:` to be used to merge anchors (#4350)
- [enhancement] Improve JUnit formatter (#4327)
- [enhancement] completed-docs: check properties and methods in interfaces (#4032)
- [enhancement] file-name-casing-rule supports regex expression for matching file (#4284)
- [enhancement] prose formatter uses `line:column` instead of `[line, column]` (#4222)
- [rule-change] Add "backtick" option for quotemark (#4029)
- [rule-change] Allow void expressions in binary expressions (#4323)

Thanks to our contributors!

- Shinigami
- Matthew Herbst
- Joshua R
- John Wiseheart
- Mitchell Wills
- Eric Ferreira
- Daniel Reichhart
- Rui
- Pavel Birukov
- Brian Schlenker
- Michael Black
- Andy Hanson
- atsu85
- PomanoB
- Oleg Vaskevich
- Daniel McNab
- Jan Pilzer
- Sebastian Silbermann
- Michael Lavina
- reduckted
- Ryan Waskiewicz
- Bowen Ni
- Josh Goldberg
- Erik
- Nathan
- Kevin Verdieck
- Joe Chung
- Peter Safranek
- Xavier Downs
- Igor Ovsiannikov
- RyosukeFukushima
- Andrew Boyton
- samuela
- stefanhamburger
- Carsten Dietzel
- Jakob Warkotsch
- Karthick Manoharan
- Ian Clanton-Thuon
- Yordis Prieto
- Mike Frysinger
- Dario Banfi
- Gérôme Grignon
- Antony74
- Morgan Zolob
- Young Min Kim
- rrogowski
- Eric Anderson
- Simon Marchi
- ulrichb
- Marvin Altemeier
- Ifiok Jr
- Andrew MacLeay
- Ethan
- Dan Homola
- NN
- Roman Rogowski

# v5.11.0

# :warning: Deprecations

- [deprecation] `no-unused-variable` is deprecated because typescript now covers most of its functionality (#3919)

# :tada: Features

- [new-rule]`file-name-casing` (#3978)
- [new-fixer] Add fixer for `switch-final-break` (#3615)
- [new-fixer] Implemented fixer for `member-ordering` and added corresponding tests. (#3935)
- [new-rule-option] Add whitelist for `no-implicit-dependencies` (#3979)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`no-use-before-declare` Fixes false positives when using the destructuring syntax (#3761) (#3876)
- [bugfix] Fix Copyright: @license JSDoc tag was missing (#3879)
- [bugfix] Fix missing newline at end of file (#3896)
- [bugfix] allow-empty-functions option of `no-empty` rule is now properly respecting empty methods (#3897)
- [bugfix]`no-magic-numbers` - support for negative zero (#3903)
- [bugfix] Handle tsconfig.json errors without using JSON.stringify (#3908)
- [bugfix] Fix CI: `no-implicit-dependencies` test failure; typescript@next failure (#4019)
- [bugfix] Fix edge case in `no-console` rule (#4041)
- [docs] Fix typos in the `no-floating-promises` rule docs. (#3886)
- [docs] Updated `prefer-while` docs to be semantically correct (#3888)
- [docs] Fix link to configuration page (#3891)
- [docs] Fix docs typo (#3898)
- [docs] Fix docs typo (#3910)
- [enhancement] Turn on strictPropertyInitialization for src/ and test/ (#3924)
- [enhancement] Use Buffer.allocUnsafe instead of the deprecated new Buffer() (#3985)
- [enhancement] Improve `radix` rule checks (#3901)
- [enhancement] Output +/- on diff so added/removed empty lines are visible. (#3973)
- [rule-change]`no-implicit-dependencies` now always considers peer dependencies (#3875)

Thanks to our contributors!

- Bowen Ni
- Peter Safranek
- Saugat Acharya
- Jason Mendes
- Ryan Waskiewicz
- Dariusz Rumiński
- Xinhu Liu
- Rado Kirov
- aervin_
- Josh Goldberg
- mertdeg2
- Jason Killian
- Adrian Leonhard
- david-cannady
- Andy Russell
- Tibor Blenessy
- Andrew Crites
- Pavel Birukov
- shalomdotnet

# v5.10.0

# :tada: Features

- [new-rule]`prefer-while` (#3750)
- [new-fixer]`comment-format` (#3845)
- [new-rule-option] `"allow-empty-functions"` for `no-empty` rule (#3624)
- [new-rule-option] New options for `promise-function-async` specifying what kinds of functions to check (#3807)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`file-header` rule plays nice with `no-trailing-whitespace` rule (#3802)
- [bugfix]`no-unbound-method` rule allows square bracket property access (#3610)
- [bugfix]`no-unsafe-any` no longer marks native JSX elements as unsafe (#3699)
- [enhancement]`file-header` auto-fixes use '!' character to ensure header stays above imports (#3741)
- [enhancement] Better error messages if a rule crashes (#3836)
- [enhancement] Better error messages when no valid rules are specified (#3729)
- [enhancement] Better lint messages for unused imports in `no-unused-variable` rule (#3831)
- [docs] Improve documentation of cli flag –project (#3703)
- [docs] Added short rationales for about thirty rules (#3734)
- [docs] Added optional capability to provide code examples in rules' metadata (#3602)
- [docs] Many small docs fixes and tweaks from many great contributors!

Thanks to our contributors!

- Achim Weimert
- BB9z
- Blair Zajac
- Chia-Lun Wu (Leo)
- Ethan
- Janis Koehr
- Josh Goldberg
- Julian Verdurmen
- Lucas Sloan
- Mark Vincze
- Martin Möhwald
- Oliver Joseph Ash
- Pichest Wongsiripiphat
- Rafael Santana
- Ruben Bridgewater
- Ryan Waskiewicz
- Sehrope Sarkuni
- Suchan Lee
- Victor Belozyorov
- aervin_
- cwgorman
- felipeissa
- jishi9

# v5.9.1

# :hammer_and_wrench: Bugfixes

- [bugfix] Removed extraneous deprecation warning produced when using `tslint:recommended` or `tslint:latest` by disabling `typeof-compare` in these rulesets. (#3639)
- [bugfix] Resolve directories as absolute paths when validating custom `rulesDirectory` paths, which fixes usage with tslint-loader. (#3640)

# v5.9.0

# :warning: Deprecations

- [deprecation] Several utility functions from `src/language/utils.ts` have been deprecated (#3476)
- [deprecation] Linting non-existent files now outputs a warning. This will be an error in TSLint 6. (#3313)

# Configuration inheritance changes

Significant changes have been made to configuration inheritance to address a long-standing UX issue around `defaultSeverity`: #2569.

`defaultSeverity` defined in a `tslint.json` file will now override the `defaultSeverity` value defined in any configurations you are extending. This means that any rules specified in the base configurations can now take on a new `defaultSeverity` if you so choose. If you extend multiple configuration files, the `defaultSeverity` defined in the last one wins.

In practice, this allows users to, for example, more easily use the built-in TSLint configurations (`tslint:recommended`, `tslint:latest`, `tslint:all`) and treat all errors as warnings instead of errors.

For more details, see the relevant PRs:

- Override `defaultSeverity` defined in extended configs (#3449)
- Inherit defaultSeverity and apply it to preceding base configs (#3530)

# :tada: Features

- [feature] Support yaml configuration files (#1598) (#3433)
- [new-fixer]`file-header` (#3475)
- [new-rule]`no-dynamic-delete` (#3573)
- [new-rule]`prefer-readonly` (#2896)
- [new-rule]`newline-per-chained-call` (#3278)
- [new-rule-option] `"temporalDeadZone"` for `no-shadowed-variable` to ignore shadowing in the temporal dead zone of classes, parameters, enums and variables declared with `let` or `const` (#3389)
- [new-rule-option] `"shorthand-first"` for `object-literal-sort-keys` (#3607)
- [new-rule-option] Add support for an ignore pattern for `max-line-length` (#3099)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix] Update commander.js dependency to prevent users from transitively installing a buggy 2.12.0 release (#3510)
- [bugfix] `--project` excludes all files of external dependencies (#3320)
- [bugfix] Show errors when `tsconfig.json` is invalid (#3410)
- [bugfix]`no-implicit-dependencies` don't crash on malformed package.json (#3373)
- [bugfix]`strict-type-predicates` allows comparing typeof result with non-literals (#3542)
- [bugfix]`no-redundant-jsdoc` fixed crash on unhandled tag (#3414)
- [bugfix]`object-literal-sort-keys` fixed regression that effectively disabled the rule with `\r\n` line breaks (#3427)
- [bugfix]`curly` fixer now correctly handles comments (#3473)
- [bugfix]`no-unsafe-any` fixed false-positive with namespaced types (#3487)
- [bugfix] Removed potentailly dangerous fixer for `no-any` (#3486)
- [bugfix]`no-unnecessary-type-assertion` fixed false negatives for types with numeric keys (#3468)
- [bugfix]`callable-types` adds parentheses when fixing a type literal inside an array type (#3440)
- [bugfix]`no-unsafe-any` allows spreading an `any` value into an object (#3439)
- [bugfix] no unnecessary whitespace before argument in callback functions fixed with `arrow-parens` fixer (#3618)
- [bugfix]`prefer-const` false negative with index signature named like a variable (#3385)
- [bugfix]`whitespace` rule checks property declarations if `"check-decl"` is enabled (#3546)
- [bugfix] Using ternary operator for calling super() now passes `no-duplicate-super` rule. (#3544)
- [bugfix]`no-shadowed-variable` now excludes declaration files and ambient modules (#3387)
- [bugfix]`no-duplicate-imports` Allow duplicate imports from separate ambient module declarations (#3398)
- [bugfix]`await-promise` correctly recognises classes extending Promise (#3383)
- [bugfix]`prefer-conditional-expression`: don't repeat error on nested if statements (#3528)
- [bugfix]`completed-docs`: don't require documentation on methods in object literals (#3532)
- [bugfix]`one-line` fixed crash on syntax error in class or interface (#3538)
- [bugfix]`no-redundant-jsdoc` allow `@template` tag if it has a description (#3415)
- [bugfix] Fix condition for deprecation of `typeof-compare` (#3429)
- [enhancement] Better error message for files not contained in the project (#3313)
- [enhancement] `"properties"` option for `completed-docs` rule now checks getter and setter accessors. (#3497)
- [enhancement]`no-magic-numbers` ignores parseInt radix parameter (#3536)
- [enhancement] Avoid duplicate I/O when using `--project` option (#3313)
- [enhancement] clicking the filename in `stylish`-formatter's output jumps to the first failure in that file. (#3491)
- [enhancement]`ban-comma-operator` ignores comma operator inside for-loop incrementor (#3485)
- [enhancement]`space-within-parens` updated to always allow empty parentheses `()`. (#3513)
- [enhancement] Better error message syntax for `completed-docs` modifier lists (#3379)
- [enhancement] Improve failure message & docs for `ban-comma-operator` (#3384)
- [enhancement] Output code warnings in yellow instead of red for codeFrame formatter (#3402)
- [enhancement] Converted `completed-docs` rule to use a function instead of a walker (#3466)
- [docs]`ban-comma-operator`: fix metadata, list as "functionality" rule (#3612)
- [docs] Enhance `no-use-before-declare` documentation to clarify the rule's status (#3520)
- [docs] Enhance `await-promise` options documentation (#3519)
- [docs] Add `hasFix` metadata for the `indent` rule (#3529)
- [docs] Clearer rule description for `no-irregular-whitespace` (#3627)

Thanks to our contributors!

- Klaus Meinhardt
- Josh Goldberg
- Chris Barr
- Nathan Shively-Sanders
- Jeremy Morton
- Sergey Koshechkin
- Daniel Kucal
- Eric Smekens
- Johannes Choo
- Elena Vilchik
- Eugene Timokhov
- Carlo Bottiglieri
- reduckted
- Glavin Wiechert
- jbsingh
- Mateusz Witkowski
- HideDev
- Bruno Lemos
- aervin_
- Roman
- Ryan Waskiewicz

# v5.8.0

# :warning: Deprecations

- [deprecation]`typeof-compare` is deprecated because typescript already does that check (#3286)
- [deprecation] CLI argument `--type-check` is no longer necessary and will be removed in the next major version (#3322)

# Updates to <tt>tslint:latest</tt> configuration

+ "ban-comma-operator": true,
+ "jsdoc-format": {
+ options: "check-multiline-start",
+ },
+ "no-duplicate-switch-case": true,
+ "no-implicit-dependencies": true,
+ "no-return-await": true,

# :tada: Features

- [feature] Added `linterOptions` configuration field to `tslint.json`, which supports a list of `exclude` globs to disable linting for a subset of files (#2409)
- [new-rule]`no-return-await` (#3233)
- [new-rule]`no-redundant-jsdoc` (#2754)
- [new-rule]`no-duplicate-switch-case` (#2937)
- [new-rule]`no-implicit-dependencies` (#3343)
- [new-rule]`no-unnecessary-class` (#3119)
- [new-rule]`ban-comma-operator` (#3250)
- [new-fixer]`one-line` (#3200)
- [new-fixer]`curly` (#3262)
- [new-rule-option]`jsdoc-format` adds option `"check-multiline-start"` to enforce the first line of a multiline JSDoc comment to be empty. (#3181)
- [new-rule-option]`trailing-comma` adds option `"esSpecCompliant"` to make it compatible with the ES spec regarding trailing commas after object/array rest and rest parameters. (#3176)
- [new-rule-option] `"check-parameter-property"` option for `member-access` rule (#3325)
- [new-rule-option] `"strict-bound-class-methods"` option for `semicolon` rule (#3294)
- [new-rule-option] `"grouped-imports"` option for `ordered-imports` rule (#3138)
- [new-rule-option] `"ignore-blank-lines"` option for `no-trailing-whitespace` rule (#3346)
- [new-rule-option] `"never"` option for `object-literal-shorthand` disallows shorthand notation (#3268)
- [new-rule-option] `"exclude-class-expressions"` option for `max-classes-per-file` rule (#3281)
- [new-rule-option]`no-unnecessary-type-assertion` supports a whitelist of types to ignore (#3257)
- [new-rule-option] `"module-source-path"` for `ordered-imports` allows sorting imports by trailing end of path (#3178)
- [new-formatter] JUnit (#3194)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`no-empty-interface` allows providing type arguments for extended type (#3260)
- [bugfix] Fixed line switches to not disable failures in the next line following the disabled line (#3177)
- [bugfix]`return-undefined` handles union return types in async functions (#3298)
- [bugfix]`deprecation` checks correct constructor overload (#3203)
- [bugfix]`return-undefined` declared return type takes precedence over contextual type (#3298)
- [bugfix] Correctly mark `inputFilePath` as an optional parameter in `Configuration.findConfiguration()` (#3195)
- [bugfix]`return-undefined` fixed regressions: once again allows anything if return type is `any` (#3298)
- [bugfix]`only-arrow-functions` allow function if `this` is used in parameter initializer (#3315)
- [bugfix]`no-conditional-assignment`: exclude intentional assignments, e.g. inside functions (#2629)
- [bugfix]`no-angle-bracket-type-assertion` fixer adds parentheses when necessary (#3301)
- [bugfix]`no-angle-bracket-type-assertion` fixed order when autofixing consecutive assertions (#3301)
- [bugfix] `vso` formatter no longer duplicates output for fixed failures (#3348)
- [bugfix]`no-unbound-method`: Allow negation of method (#3349)
- [bugfix]`arrow-parens` with option `"ban-single-arg-parens"` no longer produces invalid code when fixed (#3247)
- [bugfix] Fixed regression where the lookup of `tslint.json` stopped at the current directory. (#3309)
- [bugfix] `--test` works correctly with any `compilerOptions.target` (#3296)
- [bugfix] `whitepace` handles files with BOM and other irregular whitespace (#3305)
- [bugfix]`callable-types` auto fix produces invalid results (#3342)
- [bugfix]`no-string-literal` correctly fix property names with leading underscores (#3184)
- [bugfix]`variable-name` fixed crash on empty variable name (#3292)
- [bugfix]`trailing-comma` fixed crash on arrow function without parens (#3246)
- [bugfix] Fix `space-before-function-paren` for anonymous/arrow generic functions (#3085)
- [bugfix] Removed warning printed to console when using the `no-unused-variable` along with the `noUnusedLocals` and `noUnusedParameters` compiler options (#3227)
- [bugfix]`no-invalid-this` ignores functions with a `this` param (#3267)
- [enhancement] Sort failures by line and character for formatters (#3345)
- [enhancement]`import-blacklist` also checks exports and dynamic imports (#3258)
- [enhancement]`no-conditional-assignment` added check for conditional (ternary) expressions (#2629)
- [enhancement] Allow `completed-docs` to list doc tags that mark a node as not requiring a documentation body. Tags can also provide a regexp matcher to validate that their contents are docs-valid. (#2415)
- [enhancement]`await-promise` enforces that `for-await-of` is only used with `AsyncIterable` (#3297)
- [enhancement]`one-line` checks type alias declarations (#3200)
- [enhancement]`deprecation` checks object destructuring (#3318)
- [enhancement]`no-submodule-imports` also checks exports (#3258)
- [enhancement]`restrict-plus-operands`: More specific error message when arguments include strings (#3220)
- [enhancement]`no-unsafe-any` checks more expressions, for example destructuring, `yield`, property initializer (#3196)
- [enhancement]`object-literal-sort-keys`: allow grouping of object properties via additional blank lines when using alphabetical ordering. (#3191)
- [enhancement] Migrated CLI from using `colors` module to `chalk` module (#3171)
- [enhancement]`no-unused-variable` applies the ignorePattern to imports (#3187)

Thanks to our contributors!

- Klaus Meinhardt
- Charles Samborski
- Donald Pipowitch
- Josh Goldberg
- mmkal
- Erik
- Csaba Miklos
- Dominik Moritz
- Khalid Saifullah
- Lukas Spieß
- Merott Movahedi
- Bowen Ni
- ksvitkovsky
- Hutson Betts
- Caleb Eggensperger
- Brent Erickson
- Trivikram
- Brandon Furtwangler
- Pavel Zet
- aervin_
- Holger Jeromin
- Danny Guo
- Jeremy Morton
- Cyril Gandon
- Andy Hanson
- yadan

# v5.7.0

# :tada: New rules, options, and fixers

- [new-rule]`no-parameter-reassignment` (#3045)
- [new-rule-option]: `object-literal-sort-keys`: Add `match-declaration-order` option (#2829)
- [new-rule-option] `check-type-operator` for `whitespace` rule (#3083)
- [new-rule-option]`whitespace`: Add `check-rest-spread` option (#3089)

# :hammer_and_wrench: Bugfixes & enhancements

- [api] `AbstractRule#applyWithFunction` allows additional parameter that is passed through to `walkFn` (#3140)
- [api] `AbstractRule#applyWithFunction` has better type checking for its type parameter (#2660)
- [bugfix]`member-access` autofix now correcly inserts `public` keyword after decorators (#3162)
- [bugfix]`prefer-const` correctly handle `catch` without binding parameter introduced in `typescript@2.5.1` (#3151)
- [bugfix]`no-invalid-template-strings` allows backslash-prefixed template expressions (#3116)
- [bugfix]`deprecation` no longer shows errors on imports and exports (#3141)
- [bugfix]`deprecation`: fix false positive when calling a function or method where another overload is deprecated (#2883)
- [bugfix]`whitespace`: fixed `"check-separator"` for trivial `for` cases. (#3132)
- [bugfix]`prefer-object-spread` prevent spreading `this` as it is not allowed by the compiler (#3126)
- [bugfix] `msbuild` formatter uses backslashes in paths on Windows (#3145)
- [bugfix]`no-namespace` ignores global augmentation (#3161)
- [enhancement] remove superfluous empty lines on tslint output. (#3121)
- [enhancement]`no-submodule-imports` allows whitelisting of submodules like `@angular/core/testing` (#3129)
- [enhancement] custom lint rules will be resolved using node's path resolution to allow for loaders like `ts-node` (#3108)
- [enhancement]`quotemark` no longer requires `"single"` or `"double"` to be the first option. The rule defaults to `"double"` if none is specified. (#3114)
- [enhancement]`no-unused-variable` autofix removes trailing comments of imports (#3156)
- [enhancement]`no-unnecessary-type-assertion` allows certain necessary assertions to prevent type widening (#3120)

Thanks to our contributors!

- Paul Gschwendtner
- Andy Hanson
- ksvitkovsky
- Santi Albo
- aervin
- Junle Li
- Joscha Feth
- WiseBird
- Caleb Eggensperger
- WGroenestein
- Bowen Ni

# v5.6.0

# :tada: New rules, options, and fixers

- [new-rule]`no-duplicate-imports` (#3075)
- [new-rule]`no-submodule-imports` (#3091)
- [new-rule]`space-within-parens` (#2959)
- [new-fixer]`member-access` (#2969)
- [new-fixer]`no-null-keyword`: fix `x == null` to `x == undefined` (#2802)
- [new-rule-option]`no-shadowed-variable` let's you optionally ignore certain kinds of declarations (#3030)
- [new-rule-option]`prefer-conditional-expression` adds `check-else-if` (#2963)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`array-type`: consider `this` to be simple type (#2982)
- [bugfix]`await-promise` accepts not only union types but also intersection types with Promise-like types (#2987)
- [bugfix]`callable-types`: don't remove export modifier of interfaces (#2962)
- [bugfix]`completed-docs`: Only checks variables at the file-level. (#2950)
- [bugfix]`completed-docs`: Uses correct visibility of variables. (#2950)
- [bugfix]`no-floating-promises`: recognize rejection handler passed as second argument to `promise.then()` (#3048)
- [bugfix]`no-shadowed-variable` don't warn for shadowed type parameter on static class members (#3030)
- [bugfix]`no-shadowed-variable` fixed false positive with key name in index signature (#3030)
- [bugfix]`no-shadowed-variable` fixed false positive with parameter inside function decorator (#3030)
- [bugfix]`no-unsafe-any`: allow truthyness and falsyness checks (#3008)
- [bugfix]`no-unused-variable` fixed crash when using destructuring (#3058)
- [bugfix]`one-line` correctly handles multiline type parameters (#3004)
- [bugfix]`prefer-for-of` fixed false positives when array is modified, e.g. `arr[i]++` (#3044)
- [bugfix]`prefer-object-spread` adds parens when fixing arrow function return (#3026)
- [bugfix]`prefer-object-spread` permit functions as first argument to Object.assign (#3098)
- [bugfix]`space-before-function-paren` Handle default exports of functions without names like anonymous functions (fixes #3040) (#3053)
- [bugfix] Fixed an issue where, at runtime, the module `./test/parse` could not be located due after consumers had run `yarn clean` (#3072)
- [enhancement]`no-null-keyword` allows strict comparison (#2802)
- [enhancement]`no-switch-case-fall-through` matches `// falls through` comments case insensitive and allows trailing text (#2983)
- [enhancement]`ordered-imports`: support importEqualsDeclaration (#3102)
- [enhancement] Added NaN and (+/-)Infinity as numbers to `no-inferrable-types` (#2885)
- [enhancement] Improved CLI error message when no filenames are specified (#3066)
- [rule-change]`prefer-conditional-expression`: ignore `if-else-if` by default. Use the new `"check-else-if"` option to check nested if statements (#2963)

Thanks to our contributors!

- Klaus Meinhardt
- Julian Verdurmen
- Alexandre Alonso
- Josh Goldberg
- ksvitkovsky
- Daisuke Yokomoto
- Andrii Dieiev
- Florent Suc
- Jason Killian
- Amin Pakseresht
- reduckted
- vilicvane
- Russell Briggs
- Andy Hanson
- Leo Liang
- Dan Homola
- BehindTheMath
- David Golightly
- aervin
- Daniel Kucal
- Ika
- Chris Barr

# v5.5.0

Editor's note: This release features an important bugfix for overlapping fixes when using `--project` and `--fix` (#2864).

# :tada: New rules and options

- [new-rule-option]`completed-docs`: Add `enum-members` option (#2911)
- [new-rule]`no-this-assignment` (#2931)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`encoding` closes files correctly (#2958)
- [bugfix]`whitespace` fix whitespace `"check-module"` to properly lint and fix errors (#2401) (#2825)
- [bugfix]: `whitespace`: now correctly handles dynamic imports introduced in typescript@2.4.0 (#2924)
- [bugfix]`switch-final-break`: don't fail if break jumps to a label outside of the switch (#2914)
- [bugfix]`no-shadowed-variable`: exempt `this` parameter (#2598)
- [bugfix]`prefer-for-of` correctly handles variable scopes and other unrelated identifiers (#2984)
- [bugfix] Don't leave blank lines when `no-unused-variable` autofix removes whole import (#2901)
- [cli] restore `-v` option (#2926)
- [enhancement] Print stack trace of exceptions (#2890)
- [enhancement] Added allow-empty-catch option to `no-empty` (#2886)
- [enhancement]`prefer-const`: handle destructuring in for-of loop initializer as if `{"destructuring": "all"}` was specified (#2904)
- [enhancement]`no-shadowed-variable`: added checks for other shadowing declarations, e.g. interfaces, classes, type parameters, imports, etc. (#2598)
- [rule-change]`no-shadowed-variable` no longer fails for declarations in the same scope, e.g. `var foo; var foo;`. Use the rule `no-duplicate-variable` to find such errors. (#2598)

Thanks to our contributors!

- Klaus Meinhardt
- Josh Goldberg
- Petr Kosikhin
- Pablo Núñez
- Benny Neugebauer
- Radon Rosborough
- reduckted
- Chris Barr
- Julian Verdurmen

# v5.4.3

# :hammer_and_wrench: Bugfixes

- [bugfix] Fixed regression with empty `--out` file (#2867)
- [bugfix]`unified-signatures`: Don't suggest to unify rest parameters. (#2874)
- [bugfix]`binary-expression-operand-order`: Allow if both sides of the binary expression are literals. (#2873)
- [bugfix] Restore compatibility with typescript@2.1 and 2.2 for `whitespace`, `space-before-function-paren` and `deprecation` (#2893)
- [docs]`no-string-literal`: Fix documentation (#2875)

# v5.4.2

# :hammer_and_wrench: Bugfixes

- [bugfix] Restored support for multiple `--exclude` options in the CLI (#2855)
- [bugfix] Restored support for `--version` CLI option (#2857)

# v5.4.1

# :hammer_and_wrench: Bugfixes

- [bugfix] Fixed regression in `--exclude` CLI option when using `--project` (#2852)

# v5.4.0

# :star: Non-breaking API changes

- `--type-check` only checks for errors before linting is no longer required to enable rules that use the type checker. You only need to supply `--project` now.

# :tada: New rules, options, and fixers

- [new-rule]`switch-final-break` (#2804)
- [new-rule]`use-default-type-parameter` (#2253)
- [new-rule]`binary-expression-operand-order` (#2805)
- [new-rule-option]`ban` new options format: allows to specify an optional explanation message for function bans, banning nested methods and using a wildcard for object of a method ban (#2547)
- [new-rule-option]`no-duplicate-variable` adds `check-parameters` option to check if variable has the same name as a parameter (#2597)
- [new-rule-option]`curly`: "as-needed" option (#2842)
- [new-rule-option]`no-unbound-method` add option `"ignore-static"` (#2751)
- [new-rule-option]`strict-boolean-expressions` adds `allow-boolean-or-undefined` (#2820)
- [new-fixer]`object-literal-shorthand` can fix longhand methods (#2558)

# :hammer_and_wrench: Bugfixes & enhancements

- [bugfix]`prefer-object-spread` allows constructor, function and method calls and more as first argument to `Object.assign` (#2828)
- [bugfix]`no-unbound-method` walker skips past the parent if it is a cast or parenthesized expression (#2838)
- [bugfix]`object-literal-shorthand`: fixed suggestion for generator functions (#2558)
- [bugfix] Fixed issue with case sensitivity of `no-unused-variable` rule on Windows (#2819)
- [bugfix] don't crash `tslint --project` if `allowJs` is set in tsconfig.json (#2823)
- [bugfix]`align` with option `"members"`: check members of class expressions; don't check semicolons in classes (#2668)
- [bugfix]`no-inferred-empty-object-type`: fix stack overflow (#2762)
- [bugfix]`semicolon`: don't warn about unnecesary semicolon when it is actually needed, e.g. when followed by type assertion or template string (#2655)
- [bugfix]`space-before-function-paren`: Ignore async arrow function with no parentheses (#2833)
- [bugfix]: `no-unsafe-any`: Don't fail on `continue label;` (#2830)
- [bugfix]`no-unbound-method`: Allow unbound method to be used as a condition (#2834)
- [bugfix]`no-unsafe-any`: Allow to switch on a value of type `any` (#2836)
- [bugfix]`no-unsafe-any`: Don't mark `declare global {}` as an unsafe any. (#2839)
- [bugfix]`indent` now checks indentation of expressions inside template strings (#2826)
- [enhancement] `--project` (or `-p`) enables rules that require the type checker. `--type-check` only checks for errors before linting is no longer required (#2773)
- [enhancement]`deprecation`: error message includes deprecation text if available (#2748)
- [enhancement]`cyclomatic-complexity`: Don't count empty switch case(#2743)
- [enhancement]`strict-boolean-expressions`: Allow `any`, and `true` and `false` literal types (#2758)
- [enhancement]`no-floating-promises`: Allow 'promise.catch()' (#2774)
- [enhancement]`comment-format` no longer excludes comments with triple slash from linting except `/// <reference path="..."/>` (#2616)
- [enhancement]`prefer-object-spread`: lint more locations where return value is used. (#2828)
- [enhancement]`semicolon`: option `"never"` is now spec compliant (#2655)
- [enhancement]`object-literal-shorthand` handles async functions correctly (#2558)
- [enhancement] `--test` CLI option: allow passing path to tslint.json (#2784)
- [enhancement] Use commander instead of optimist for CLI arguments (#2689)
- [enhancement]`strict-type-predicates`: warn if strictNullChecks is not enabled (#2786)

Thanks to our contributors!

- Klaus Meinhardt
- Manuel Lopez
- Andy Hanson
- Piotr Tomiak

# v5.3.2

- [bugfix] Fixes `not a directory` error (#2813)

# v5.3.0

# This change may require a change to tslint.json

- [enhancement]`prefer-switch`: Change default `min-cases` to 3. (#2669)

# :tada: Features & enhancements

- [new-cli-option] cli: Add `outputAbsolutePaths` option (#2667)
- [new-rule]`prefer-object-spread` (#2624)
- [new-rule]`encoding` (#2368)
- [new-rule]`prefer-conditional-expression` (#2363)
- [new-rule-option]`indent` support indent size (#2723)
- [new-rule-option]`object-literal-sort-keys` adds `ignore-case` (#2592)
- [new-rule-option]`quotemark`: Add `avoid-template` option (#2766)
- [new-rule-option]`await-promise`: What's considered a "Promise" is now configurable. (#2661)
- [new-fixer]`indent` (#2723)
- [new-fixer]`typedef-whitespace` (#2718)
- [enhancement] better error messages in `variable-name` (#2672)
- [enhancement]`typedef`: Use name or parameters for error location (#2460)
- [enhancement]`object-literal-sort-keys`: check shorthand properties (#2592)
- [enhancement]`space-before-function-paren`: Handle `get`/`set` accessor (#2700)
- [enhancement]`typedef-whitespace` added checks for arrow function, call and construct signature (#2718)
- [enhancement]`no-object-literal-type-assertion`: Allow cast to `any` (#2671)
- [enhancement] cli: `-p` option handles directories (#2756)
- [develop] testing rules with type information is enabled when a `tsconfig.json` is found next to `tslint.json` (#2769)
- [configuration] deprecate mixed case tslint.json (#2713)
- [bugfix]`return-undefined`: Treat a return type `void | undefined` same as `void` (#2731)
- [bugfix]`no-unnecessary-initializer`: Handle `BindingElement` anywhere, not just in a `VariableDeclaration`. (#2707)
- [bugfix]`jsdoc-format`: correctly handle alignment in files with BOM (#2619)
- [bugfix]`jsdoc-format`: don't treat empty comments (`/**/`) as jsdoc (#2619)
- [bugfix]`typedef-whitespace` don't warn for leading whitespace if token is preceded by line break (#2718)
- [bugfix] Make "completed-docs" rule respect "public" privacy (or lack thereof) (#2749)
- [bugfix]`jsdoc-format`: fixed error position if line ends with `\r\n` (#2619)
- [bugfix]`prefer-switch`: add missing checks for some expressions (#2686)
- [bugfix]`prefer-template`: Allow `"a" + "b" + "c"`. (#2741)
- [bugfix]`prefer-const`: fix false positive with variable declared outside of for-of or for-in (#2760)
- [bugfix] `--project`: fix file matching with relative path to `tsconfig.json` (#2688)
- [bugfix]`no-default-export`: correctly handle `export default abstract class {...}` (#2630)
- [bugfix]`no-mergeable-namespace`: display correct line in error message (#2656)
- [bugfix]`object-literal-sort-keys`: handle object spread correctly (#2592)
- [bugfix] Consistently output absolute/relative paths (#2667)
- [bugfix]`await-promise`: Consider types derived from a Promise in union types too. (#2661)
- [bugfix]`no-unsafe-any`: Fix bug where number literal in type position was flagged as an unsafe `any`. (#2712)
- [api] Deprecate `Lint.Utils.objectify` (#2764)

Thanks to our contributors!

- Andy Hanson
- Klaus Meinhardt
- Martin Probst
- Filipe Silva
- walkerburgin
- René Scheibe

# v5.2.0

- [rule-change]`no-console` bans all console methods when no methods are specified (#2610)
- [new-rule]`no-object-literal-type-assertion` (#2580)
- [new-rule]`no-irregular-whitespace` (#2487)
- [new-rule]`prefer-switch` (#2331)
- [new-rule]`number-literal-format` (#2526)
- [new-rule]`deprecation` (#2395)
- [new-rule]`no-unnecessary-type-assertion` (#2519)
- [new-fixer]`interface-over-type-literal` (#2617)
- [new-fixer]`callable-types` (#2552)
- [new-fixer]`no-string-literal` (#2495)
- [new-fixer]`no-internal-module` (#2517)
- [new-rule-option]`align` rule added `members` option, which checks alignment of methods and properties of classes, objects, interfaces, type literals and object destructuring (#2387)
- [new-rule-option]`align` rule added `elements` option, which checks alignment of elements in array literals, array destructuring and tuple types (#2387)
- [new-rule-option]`trailing-comma` adds more granular options to specify trailing commas for arrays, objects, functions, type literals, imports, and exports (#2538)
- [api] Deprecate `ScopeAwareRuleWalker` and `BlockScopeAwareRuleWalker`. (#2561)
- [develop] added support for error templates in rule tests (#2481)
- [bugfix] Fixes "Severity for rule not found" error (#2516)
- [bugfix]`no-unused-expression`: allow `void(0)` in addition to `void 0` and `void` in expression and statement position (#2645)
- [bugfix]`align`: fix false positive for files with BOM (#2642)
- [bugfix]`return-undefined`: Handle contextual types with ambiguous signatures; allow `any`; and handle async functions. (#2576)
- [bugfix]`semicolon`: don't mark semicolon as unnecessary when the next statement is on the same line (#2591)
- [bugfix]`no-internal-module`: no more false positives for global augmentation (#2517)
- [bugfix]`no-unnecessary-qualifier`: no longer breaks when walking a function that references `arguments` (#2555)
- [bugfix]`prefer-const` no longer shows warnings on ambient declarations (#2391)
- [bugfix]`callable-types`: suggest correct fix for interfaces with type arguments (#2552)
- [bugfix]`quotemark`: fix regression with jsx attributes (#2605)
- [bugfix]`adjacent-overload-signatures` handles functions ending in semicolon (#2412)
- [bugfix]`object-literal-key-quotes`: correctly stringify numbers when fixing (#2515)
- [bugfix]`object-literal-key-quotes`: does no longer require quotes for property names containing digits (#2515)
- [enhancement] Failures in extended config files now indicate which file (#2588)
- [enhancement]`align`: Don't report 'statements are not aligned' for empty statements (#2653)
- [enhancement]`class-name` now also checks class expressions (#2553)
- [enhancement] `optionExamples`: Allow to use an options array directly instead of a string representation. (#2527)
- [enhancement] `rulesDirectory` can now be resolved with Nodes resolve logic, if the directory contains an `index.js` (#2163) (#2358)
- [enhancement]`no-unused-expression`: narrow error location for comma separated expressions and conditional expressions (#2645)
- [enhancement]`no-string-literal` now handles escaped strings (#2495)
- [enhancement]`no-unnecessary-callback-wrapper`: Allow `x => x(x)` (#2524)
- [enhancement]`no-var-keyword`: Allow global var declarations (#2513)

Thanks to our contributors!

- Andy Hanson
- Alex Eagle
- Donald Pipowitch
- Klaus Meinhardt
- Gord P
- Andy
- Quentin
- Mitchell Wills
- Vito
- CSchulz
- Josh Goldberg
- Brian Olore
- Manuel Lopez
- James Clark

# v5.1.0

- [new-rule] `no-invalid-template-strings` (#2332)
- [new-rule] `no-sparse-arrays` (#2407)
- [new-rule-option] `no-void-expression`: adds `ignore-arrow-function-shorthand` (#2445)
- [api] `tslint:all` configuration (#2417)
- [bugfix] In tslint:recommended move `no-reference-import` from `jsRules` to `rules` (#2441)
- [bugfix] `no-unnecessary-callback-wrapper`: only check if callback is identifier, allow all other expressions (#2510)
- [bugfix] `member-access`: Skip index signature, it can not have an access modifier (#2437)
- [bugfix] `restrict-plus-operands` fixes regression where every assignment and comparison was checked (#2454)
- [bugfix] `no-unnecessary-callback-wrapper`: allow async wrapper function (#2510)
- [bugfix] `prefer-for-of`: No error if `delete` is used (#2458)
- [bugfix] `radix`: don't warn for missing radix on method calls (#2352)
- [bugfix] `no-use-before-declare`: Handle symbol with empty declarations list. (#2436)
- [bugfix] `strict-type-predicates`: Check for construct signatures in `isFunction`. (#2479)
- [enhancement] `strict-boolean-expressions`: When `--strictNullChecks` is turned off, `allow-null-union` and `allow-undefined-union` turn off "always truthy" errors. (#2373)
- [enhancement] `radix`: added check for global.parseInt and window.parseInt (#2352)
- [enhancement] `arrow-return-shorthand`: Improve failure message when return expression is an object literal (#2466)

Thanks to our contributors!

- Andy Hanson
- bumbleblym
- Klaus Meinhardt
- Jonas Kello
- Minko Gechev
- Donald Pipowitch

# v5.0.0

# :fire: Breaking changes

- Minimum version of TypeScript version is now 2.1.0 (#2425)
- The severity level of rules are now configurable and defaults to severity "error". This affects the output of formatters:
  - [formatter] `msbuild` was outputting all failures as "warning".
  - [formatter] `pmd` was outputting all failures as priority 1. Now, it uses priority 3 for "error" (default) and priority 4 for "warning"
- [formatter] `json` changed the `fix` property to now contain either one replacement or an array of replacements (#2403)
- `tslint:recommended` configuration updated with `tslint:latest` rules & options (#2424)
- Removed `no-unused-new` rule, with logic moved into `no-unused-expression` (#2269)
- `no-trailing-whitespace` now checks template strings by default. Use the new options `ignore-template-strings` to restore the old behavior. (#2359)

## API breaks for custom rules

- Removed method `skip` from `RuleWalker` (#2313)

- Removed all use of the TypeScript Language Service, use only Program APIs instead (#2235)

  - This means that some rules that previously worked without the type checker now require it. This includes:
    - `no-unused-variable`
    - `no-use-before-declare`
  - This breaks custom rule compilation. If your rule was not using the `ts.LanguageService` APIs, the migration is quite simple:

  ```diff

  - public applyWithProgram(srcFile: ts.SourceFile, langSvc: ts.LanguageService): Lint.RuleFailure[] {
  - return this.applyWithWalker(new Walker(srcFile, this.getOptions(), langSvc.getProgram()));
  - public applyWithProgram(srcFile: ts.SourceFile, program: ts.Program): Lint.RuleFailure[] {
  - return this.applyWithWalker(new Walker(srcFile, this.getOptions(), program)); ```
  - N.B. If you are refactoring your custom rules, consider these performance tips for writing custom rules.
- Removed `createFix`. Replacements should be passed directly into addFailure. (#2403)
- Removed deprecated `scanAllTokens` and `skippableTokenAwareRuleWalker` (#2370)

# :tada: Notable features & enhancements

- [feature] The severity level of rules are now individually configurable. Default severity can also be configured. (#629, #345)

  - Valid values for `severity`: `default` | `error | warn | warning | none | off`
  - Valid values for `defaultSeverity`: `error | warn | warning | none | off`
  - Old style:

  ```json { "extends": "tslint:latest", "rules": { "callable-types": true, "max-line-length": [true, 140] } } ```

  - New style (in this example, `callable-types` outputs errors and `max-line-length` outputs warnings):

  ```json { "extends": "tslint:latest", "defaultSeverity": "error", "rules": { "callable-types": true, "max-line-length": { "options": 140, "severity": "warning" } } } ```

- [new-rule] `prefer-template` (#2243)
- [new-rule] `return-undefined` (#2251)
- [new-rule] `no-reference-import` (#2273)
- [new-rule] `no-unnecessary-callback-wrapper` (#2249)
- [new-fixer] `linebreak-style` (#2394)
- [new-fixer] `eofline` (#2393)

# Full list of changes

- [api] Added class `OptionallyTypedRule`, which allows rule authors to write a rule that applies when typing is either enabled or disabled (#2300)
- [bugfix] `prefer-function-over-method` now ignores abstract methods (#2307)
- [bugfix] `arrow-parens` with option `ban-single-arg-parens` now correctly handles functions with return type annotation (#2265)
- [bugfix] `prefer-function-over-method` exclude overload signatures (#2315)
- [bugfix] `use-isnan` now applies only to comparison operators (#2317)
- [bugfix] `file-header-rule` now handles single-line comments correctly (#2320)
- [bugfix] `newline-before-return`: fix handling of blank lines between comments (#2321)
- [bugfix] `trailing-comma` No longer enforce trailing commas in type parameters and tuple types (#2236)
- [bugfix] `align` don't fix if it would remove code (#2379)
- [bugfix] `unified-signatures` now recognizes rest parameters (#2342)
- [bugfix] `no-inferrable-types` don't warn for inferrable type on readonly property (#2312)
- [bugfix] `trailing-comma` no longer crashes on new without parentheses (e.g. `new Foo`) (#2389)
- [bugfix] `semicolon` Ignore comments when checking for unnecessary semicolon (#2240)
- [bugfix] `semicolon` Don't report unnecessary semicolon when followed by regex literal (#2240)
- [bugfix] CLI: exit with 0 on type check errors when `--force` is specified (#2322)
- [bugfix] CLI: `--test` now correctly strips single quotes from patterns on windows (#2322)
- [bugfix] `prefer-const` only fix initialized variables (#2219)
- [bugfix] `prefer-const` correctly handle variables shadowed by parameters and catched exceptions (#2219)
- [bugfix] `prefer-const` don't warn if one variable in a for loop initializer can not be const (#2219)
- [bugfix] `prefer-const` handle more cases in destructuring (#2219)
- [bugfix] `no-unused-expression` allow comma separated assignments (#2269)
- [chore] removed update-notifier dependency (#2262)
- [development] allow rule tests to specify version requirement for typescript (#2323)
- [enhancement] `ignore-properties` option of `no-inferrable-types` now also ignores parameter properties (#2312)
- [enhancement] `unified-signatures` now displays line number of the overload to unify if there are more than 2 overloads (#2270)
- [enhancement] `trailing-comma` New checks for CallSignature and NamedExports (#2236)
- [enhancement] `semicolon` New check for export statements, function overloads and shorthand module declaration (#2240)
- [enhancement] `semicolon` Report unnecessary semicolons in classes and in statement position (for option "always" too) (#2240)
- [enhancement] `semicolon` check for semicolon after method overload (#2240)
- [enhancement] `array-type` now consider `object`, `undefined` and `never` as simple types, allowing `object`, `undefined[]` and `never[]` (#1843)(#2353)
- [enhancement] `align` check statement alignment for all blocks (#2379)
- [enhancement] `align`check parameter alignment for all signatures (#2379)
- [enhancement] `--test` can handle multiple paths at once (#2322)
- [enhancement] `only-arrow-functions` allow functions that use `this` in the body (#2229)
- [enhancement] CLI: print error when `--type-check` is used without `--project` (#2322)
- [enhancement] CLI: don't print stack trace on type check error (#2322)
- [enhancement] CLI: added `-p` as shorthand for `--project` to be consistent with `tsc` (#2322)
- [enhancement] `prefer-const` show warnings for `var` (#2219)
- [enhancement] `quotemark` fixer unescapes original quotemark (e.g. ‘’\''`->`"'"`) (#2359)`
- `[enhancement]`no-unused-expression`allow indirect eval`(0, eval)("");`(#2269)`
- `[enhancement]`no-unused-expression`checking for unused new can now use option`allow-fast-null-checks`(#2269)`
- `[enhancement]`no-unused-expression`find unused comma separated expressions in all locations of the code (#2269)`
- `[enhancement]`no-unused-expression`find unused expressions inside void expression (#2269)`
- `[new-config-option] Adds`defaultSeverity`with options`error`,`warning`, and`off`. (#2416)
- [new-formatter] TAP formatter (#2325)
- [new-rule-option] `no-unused-expression` adds option `allow-tagged-template` to allow tagged templates for side effects (#2269)
- [new-rule-option] `no-unused-expression` adds option `allow-new` to allow `new` without using the new object (#2269)
- [new-rule-option] `member-access` adds `no-public` option (#2247)
- [new-rule-option] `curly` added option `ignore-same-line` (#2334)
- [new-rule-option] `{destructuring: "all"}` to only warn if all variables in a destructuring can be const (#2219)
- [new-rule-option] added `ignore-template-strings` to `no-trailing-whitespace` (#2359)
- [rule-update] `array-type` now consider `undefined` and `never` as simple types, allowing `undefined[]` and `never[]` (#1843)

Thanks to our contributors!

- Brian Olore
- Andy Hanson
- @andy-ms
- Chris Barr
- Klaus Meinhardt
- @bumbleblym
- Josh Goldberg
- James Clark
- @vilic
- Aleksandr Filatov
- Matt Banz
- Karol Janyst
- Mike Deverell
- Alexander James Phillips
- Irfan Hudda

# v4.5.1

- [enhancement] Updated recommended rules to include `ban-types` and `no-duplicate-super` (#2271)
- [bugfix] `object-literal-key-quotes` handle negative number property name (#2273)

# v4.5.0

- [new-rule] `no-import-side-effect` (#2155)
- [new-rule] `match-default-export-name` (#2117)
- [new-rule] `no-non-null-assertion` (#2221)
- [new-rule] `ban-types` (#2175)
- [new-rule] `no-duplicate-super` (#2038)
- [new-rule] `newline-before-return` (#2173)
- [new-rule-option] `completed-docs` adds options for location, type, and privacy. Also adds interfaces, enums, types (#2095)
- [new-rule-option] `no-inferrable-types` adds option `ignore-properties` (#2178)
- [new-rule-option] `typedef` adds options `object-destructuring` and `array-destructuring` options (#2146)
- [new-rule-option] `member-ordering` adds option `alphabetize` (#2101)
- [new-rule-option] `no-trailing-whitespace` adds option `ignore-jsdoc` (#2177)
- [new-rule-option] `no-trailing-whitespace` adds option `ignore-comments` option (#2153)
- [new-fixer] `no-inferrable-types` automatically remove inferrable type annotations (#2178)
- [new-fixer] `no-any` (#2165)
- [new-fixer] `noConsecutiveBlankLines` (#2201)
- [new-fixer] `object-literal-shorthand` (#2165)
- [bugfix] `no-switch-case-fallthrough` handle break, throw, continue and return nested in block, if-else and switch (#2218)
- [bugfix] `no-switch-case-fallthrough` allow empty case clauses before default clause (#2218)
- [bugfix] `no-mergeable-namespace` ignore property types that can't be merged (#2105)
- [bugfix] `object-literal-key-quotes` no need to quote a float if its .toString() is the same. (#2144)
- [bugfix] `no-consecutive-blank-lines` Correctly apply fixes at EOF (#2239)
- [bugfix]: Fixes installation issue with node 7.5 (#2212)
- [bugfix]: `quotemark` now handles escaped chars (#2224)
- [enhancement] Don't exit when a rule requires type checking but type checking is not enabled (#2188)
- [enhancement] `no-switch-case-fallthrough` allow single line comment `// falls through` (#2218)
- [enhancement] `no-unbound-method` allows property access and binary expressions (#2143)
- [api] Introduce `AbstractWalker` for performance (#2093)
  - see performance and migration docs

Thanks to our contributors!

- Andy Hanson
- Stefan Reichel
- Shlomi Assaf
- Josh Goldberg
- Minko Gechev
- Irfan Hudda
- Klaus Meinhardt
- Martin Probst
- Naoto Usuyama
- Caleb Eggensperger
- Arturs Vonda
- Joscha Feth
- Moritz
- Alexander Rusakov
- Alex Ryan
- Andy
- Yuichi Nukiyama

# v4.4.2

- [bugfix] `whitespace` rule caused false positive on EOF (#2131)
- [bugfix] WebStorm fails because `json` formatter parameter has extra space (#2132)

# v4.4.1

- [bugfix] errant space in recommended ruleset (couldn't find `no-misused-new`)

# v4.4.0

- [new-rule] `arrow-return-shorthand` (#1972)
- [new-rule] `no-unbound-method` (#2089)
- [new-rule] `no-boolean-literal-compare` (#2013)
- [new-rule] `no-unsafe-any` (#2047)
- [new-rule] `no-unnecessary-qualifier` (#2008)
- [new-rule] `no-unnecessary-initializer` (#2106)
- [new-rule] `await-promise` (#2102)
- [new-rule] `no-floating-promises` (#1632)
- [new-rule] `strict-type-predicates` (#2046)
- [new-rule] `no-misused-new` (#1963)
- [new-rule] `prefer-method-signature` (#2028)
- [new-rule] `prefer-function-over-method` (#2037)
- [new-rule-option] `allow-fast-null-checks` added to `no-unused-expression` (#1638)
- [new-rule-option] `comment-format-rule` adds `ignore-words` and `ignore-pattern` options (#1757)
- [new-rule-option] `whitespace` adds `check-preblock` option (#2002)
- [new-rule-option] `strict-boolean-expressions` adds `allow-null-union`, `allow-undefined-union`, `allow-string`, and `allow-number` and (#2033)
- [new-fixer] `align` (#2097)
- [new-fixer] `no-trailing-whitespace` (#2060)
- [bugfix] `no-magic-numbers` false positive on default parameter values (#2004)
- [bugfix] `no-empty-interface` allow empty interface with 2 or more parents (#2070)
- [bugfix] `no-trailing-whitespace` fixed for comments and EOF (#2060)
- [bugfix] `no-empty` no longer fails for private or protected constructor (#1976)
- [bugfix] `tslint:disable`/`tslint-enable` now handles multiple rules and fixes what code is enabled/disabled (#2061)
- [bugfix] `no-inferrable-types` now validates property declarations (#2081)
- [bugfix] `unified-signatures` false positive (#2016)
- [bugfix] `whitespace` finds all whitespace errors in JsxExpressions and TemplateExpressions (#2036)
- [bugfix] `comment-format` no more false positives in JsxText (#2036)
- [enhancement] `--test` option now accepts glob (#2079)

Thanks to our contributors!

- Alexander Rusakov
- Andrii Dieiev
- @andy-ms
- Andy Hanson
- Josh Goldberg
- Kei Son
- Klaus Meinhardt
- Krati Ahuja
- Martin Probst
- Mohsen Azimi
- Romke van der Meulen
- cameron-mcateer

# v4.3.1

- [bugfix] Fix back-compat break. Allow formattersDirectory === null (#1997)

# v4.3.0

- Enabled additional rules in `tslint:latest` configuration (#1981)
- [new-rule] `space-before-function-paren` (#1897)
- [new-rule] `typeof-compare` (#1927)
- [new-rule] `import-spacing` (#1935)
- [new-rule] `unified-signatures` (#1944)
- [new-fixer] `object-literal-key-quotes` (#1953)
- [new-fixer] `no-angle-bracket-type-assertion` (#1979)
- [bugfix] `adjacent-overload-signature` now handles static/computed function names (#1831)
- [bugfix] `file-header` now handles files with only comments (#1913)
- [bugfix] `no-consecutive-blank-lines` now allows blank lines in template strings (#1886)
- [bugfix] `object-literal-key-quotes` no longer throws exception when using rest operator (#1916)
- [bugfix] `restrict-plus-operands` no longer shows false positive in ternary operation (#1925)
- [bugfix] `prefer-for-of` now handles nested `for` loops with reused iterator (#1926)
- [bugfix] Exit gracefully when `tsconfig.json` passed as `--project` argument doens't have files (#1933)
- [bugfix] `object-literal-key-quotes` now handles shorthand and spread properties (#1945)
- [bugfix] `arrow-parens` Allow binding patterns `([x, y]) => ...` and `({x, y}) => ...` to have parens (#1958)
- [bugfix] `semicolon` fixer now handles comma separator in interfaces and indicates failure when commas are using in interfaces (#1856)
- [bugfix] `only-arrow-functions` option `allow-named-functions` now allows function declarations (#1961)
- [bugfix] `prefer-for-of` no longer shows false positive when array is in parentheses (#1986)
- [bugfix] `prefer-const` now works for TypeScript versions < 2.1.0 (#1989)
- [enhancement] `member-access` narrow location of error (#1964)

Thanks to our contributors!

- Andrii Dieiev
- @andy-ms
- Andy Hanson
- Josh Goldberg
- Klaus Meinhardt
- Linda_pp
- Mohsen Azimi
- Victor Grigoriu
- Yuichi Nukiyama
- cameron-mcateer

# v4.2.0

- [new-rule] `no-string-throw` (#1878)
- [new-rule] `no-empty-interface` (#1889)
- [new-rule] `interface-over-type-literal` (#1890)
- [new-rule] `callable-types` (#1891)
- [new-rule] `no-void-expression` (#1903)
- [new-rule-option] `ban-single-arg-parens` added to `arrow-parens` (#1893)
- [bugfix] `prefer-const` handles destructuring arrays (#1894), destructuring objects (#1906), and forward references (#1908)
- [bugfix] Don't error for misplaced braces for 'else' in `one-line` rule (#1866)
- [bugfix] `no-shadowed-variable` now identifies shadowed `for` iterator (#1816)
- [bugfix] `object-literal-key-quotes` now includes function names (#1874)
- [bugfix] error when EOF comes after `disable-next-line` comment (#1902)

Thanks to our contributors!

- Andrew Scott
- @andy-ms
- Andy Hanson
- James Booth
- Klaus Meinhardt
- Vladimir Matveev

# v4.1.1

- [bugfix] `typedef` rule was showing false positive for `catch` clause (#1887)

# v4.1.0

- [new-rule] `prefer-const` (#1801)
- [new-rule] `strict-boolean-expressions` (#1820)
- [new-rule] `no-magic-numbers` (#1799)
- [new-rule] `import-blacklist` (#1841)
- [new-rule] `promise-functions-async` (#1779)
- [new-rule] `no-inferred-empty-object-type`: a type must be specified when using a generic class/function/etc (#1821)
- [new-rule-option] `allow-named-functions` added to `only-arrow-functions` (#1857)
- [new-fixer] `prefer-const` (#1801)
- [new-fixer] `quotemark` (#1790)
- [new-formatter] `code-frame` formatter shows you the error in context (#1819)
- [enhancement] `no-internal-module` failures highlight less text (#1781)
- [enhancement] Avoid auto-fixing errors that would result in compilation errors for rules that use type-check (#1608)
- [rule-change] `only-arrow-functions` will allow functions with a `this` parameter (#1597)
- [bugfix] `no-use-before-declare` false positive on named import (#1620)
- [bugfix] `prefer-for-of` was showing false positive when the element is assigned (#1813)
- [bugfix] The command line argument `type-check` was swallowing the next argument (#1783)
- [bugfix] `tslint:disable-line` was re-enabling `tslint:disable` (#1634)
- [bugfix] `adjacent-overload-signatures` did not work for constructors (#1800)
- [bugfix] `checkstyle` formatter was reporting errors under one file (#1811)
- [bugfix] `trailing-comma` was applied to parameter lists (#1775)
- [api] CLI logic moved into API friendly class (#1688)

Thanks to our contributors!

- Alex Eagle
- Andrii Dieiev
- Andy Hanson
- Art Chaidarun
- Donald Pipowitch
- Feisal Ahmad
- Josh Goldberg
- Klaus Meinhardt
- Maciej Sypień
- Mohsen Azimi
- Ryan Lester
- Simon Schick
- Subhash Sharma
- Timothy Slatcher
- Yaroslav Admin
- Yuichi Nukiyama
- tdsmithATabc
- @wmrowan

# v4.0.2

- [enhancement] Don't exit when a rule can't be found. Print as a warning instead (#1771)
- [api-change] Allow 3rd party apps to see exception when the config is invalid (#1764)
- [bugfix] Don't flag a property named as empty string as not needing quotes in an object literal (#1762)
- [bugfix] Report correct number of fixes done by –fix (#1767)
- [bugfix] Fix false positives and exceptions in `prefer-for-of` (#1758)
- [bugfix] Fix `adjacent-overload-signatures` false positive when a static function has the same name (#1772)

Thanks to our contributors!

- @gustavderdrache

# v4.0.1

- [bugfix] Removed `no-unused-variable` rule from recommended config, as it was causing spurious deprecation warnings.

# v4.0.0-dev.2

- Include latest v4.0.0 changes

# v4.0.0

- BREAKING CHANGES
  - [api-change] Minor changes to the library API. See this PR for changes and upgrade instructions (#1720)
  - [removed-rule] Removed `no-unreachable` rule; covered by compiler (#661)
  - [enhancement] Changed order of applied configuration files for the `extends` array to make it more intuitive. (#1503)
  - [enhancement] Changed TypeScript peer dependency to >= 2.0.0 (#1710)
- [new-rule] `completed-docs` rule added (#1644)
- [new-fixer] `ordered-imports` auto fixed (#1640)
- [new-fixer] `arrow-parens` auto fixed (#1731)
- [rule-change] `indent` rule now ignores template strings (#1611)
- [new-rule-option] `object-literal-key-quotes` adds the options `consistent` and `consistent-as-needed` (#1733)
- [enhancement] `--fix` option added to automatically fix selected rules (#1697)
- [enhancement] Updated recommend rules (#1717)
- [enhancement] `adjacent-overload-signatures` now works with classes, source files, modules, and namespaces (#1707)
- [enhancement] Users are notified if they are using an old TSLint version (#1696)
- [bugfix] Lint `.jsx` files if `jsRules` are configured (#1714)
- [bugfix] Command line glob patterns now handle single quotes (#1679)

Thanks to our contributors!

- Andrii Dieiev
- Andy
- Chris Barr
- Davie Schoots
- Jordan Hawker
- Josh Goldberg
- Stepan Riha
- Yuichi Nukiyama

# v4.0.0-dev.1

- BREAKING CHANGES
  - [enhancement] The `semicolon` rule now disallows semicolons in multi-line bound class methods (to get the v3 behavior, use the `ignore-bound-class-methods` option) (#1643)
  - [removed-rule] Removed `use-strict` rule (#678)
  - [removed-rule] Removed `label-undefined` rule; covered by compiler (#1614)
  - [enhancement] Renamed `no-constructor-vars` to `no-parameter-properties` (#1296)
  - [rule-change] The `orderedImports` rule now sorts relative modules below non-relative modules (#1640)
- Deprecated
  - [deprecated] `no-unused-variable` rule. This is checked by the TypeScript v2 compiler using the flags `--noUnusedParameters` and `--noUnusedLocals`. (#1481)
- [enhancement] Lint .js files (#1515)
- [new-fixer] `no-var-keyword` replaces `var` with `let` (#1547)
- [new-fixer] `trailing-comma` auto fixed (#1546)
- [new-fixer] `no-unused-variable` auto fixed for imports (#1568)
- [new-fixer] `semicolon` auto fixed (#1423)
- [new-rule] `max-classes-per-file` rule added (#1666)
- [new-rule-option] `no-consecutive-blank-lines` rule now accepts a number value indicating max blank lines (#1650)
- [new-rule-option] `ordered-imports` rule option `import-sources-order` accepts value `any` (#1602)
- [bugfix] `no-empty` rule fixed when parameter has readonly modifier
- [bugfix] `no-namespace` rule: do not flag nested or .d.ts namespaces (#1571)

Thanks to our contributors!

- Alex Eagle
- Andrii Dieiev
- Ben Coveney
- Boris Aranovich
- Chris Barr
- Cyril Gandon
- Evgeniy Zhukovskiy
- Jay Anslow
- Kunal Marwaha
- Martin Probst
- Mingye Wang
- Raghav Katyal
- Sean Dawson
- Yuichi Nukiyama
- jakpaw

# v4.0.0-dev.0

- BREAKING CHANGES
  - [enhancement] Drop support for configuration via package.json (#1579)
  - [removed-rule] Removed `no-duplicate-key` rule; covered by compiler (#1109)
  - [enhancement] Call formatter once for all file results. Format output may be different (#656)
  - [rule-change] `trailing-comma` supports function declarations, expressions, and types (#1486)
  - [rule-change] `object-literal-sort-keys` now sorts quoted keys (#1529)
  - [rule-change] `semicolon` now processes type aliases (#1475)
  - [rule-change] `no-var-keyword` now rejects `export var` statements (#1256)
  - [rule-change] `semicolon` now requires semicolon for function declaration with no body (#1447)
- [new-formatter] `fileslist` formatter writes a list of files with errors without position or error type specifics (#1558)
- [new-rule] `cyclomaticComplexity`, enforces a threshold of cyclomatic complexity.] (#1464)
- [new-rule] `prefer-for-of`, which errors when `for(var x of y)` can be used instead of `for(var i = 0; i < y.length; i++)` (#1335)
- [new-rule] `array-type`, which can require using either ‘T[]’ or 'Array<T>' for arrays (#1498)
- [rule-change] `object-literal-sort-keys` checks multiline objects only (#1642)
- [rule-change] `ban` rule now can ban global functions (#327)
- [bugfix] always write lint result, even if using formatter (#1353)
- [bugfix] npm run test:bin fails on Windows (#1635)
- [bugfix] Don't enforce trailing spaces on newlines in typedef-whitespace rule (#1531)
- [bugfix] `jsdoc` rule should not match arbitrary comments (#1543)
- [bugfix] `one-line` rule errors when declaring wildcard ambient modules (#1425)

Thanks to our contributors!

- Alex Eagle
- Andrii Dieiev
- Andy Hanson
- Ben Coveney
- Boris Aranovich
- Chris Barr
- Christian Dreher
- Claas Augner
- Josh Goldberg
- Martin Probst
- Mike Deverell
- Nina Hartmann
- Satoshi Amemiya
- Scott Wu
- Steve Van Opstal
- Umar Bolatov
- Vladimir Matveev
- Yui

# v3.15.1

- Enabled additional rules in `tslint:latest` configuration (#1506)

# v3.15.0

- Stable release containing changes from the last dev release (v3.15.0-dev.0)

# v3.15.0-dev.0

- [enhancement] Rules can automatically fix errors (#1423)
- [enhancement] Better error messages for invalid source files (#1480)
- [new-rule] `adjacent-overload-signatures` rule (#1426)
- [new-rule] `file-header` rule (#1441)
- [new-rule] `object-literal-shorthand` rule (#1488)
- [new-rule-option] `allow-declarations` option for `only-arrow-functions` rule (#1452)
- [new-rule-option] `import-sources-order` option for `ordered-imports` rule (#1466)
- [bugfix] `arrow-parens` rule handles async and generics (#1446, #1479)
- [bugfix] `comment-format` rule ignores tslint control comments (#1473)
- [bugfix] Fix `no-shadowed-variable` rule false positives (#1482)

Thanks to our contributors!

- @apacala
- @danvk
- @DovydasNavickas
- @glen-84
- @IllusionMH
- @JoshuaKGoldberg
- @markwongsk
- @rakatyal
- @rhysd
- @ScottSWu
- @YuichiNukiyama

# v3.14.0

- Stable release containing changes from the last dev releases (v3.14.0-dev.0, v3.14.0-dev.1)

# v3.14.0-dev.1

- [new-rule] `arrow-parens` rule (#777)
- [new-rule] `max-file-line-count` rule (#1360)
- [new-rule] `no-unsafe-finally` rule (#1349)
- [new-rule] `no-for-in-array` rule (#1380)
- [new-rule] `object-literal-key-quotes` rule (#1364)
- [enhancement] Better `ban` rule failure messages (#1385)
- [enhancement] New stylish formatter (#1406)

Thanks to our contributors!

- @chrismbarr
- @danvk
- @gjuchault
- @lowkay
- @ScottSWu
- @YuichiNukiyama

# v3.14.0-dev.0

- [enhancement] Add optional type information to rules (#1323)

Thanks to our contributors!

- @ScottSWu

# v3.13.0

- Stable release containing changes from the last dev release (v3.13.0-dev.0)

# v3.13.0-dev.0

- [new-rule] `ordered-imports` rule (#1325)
- [enhancement] MPEG transport stream files are ignored by the CLI (#1357)

Thanks to our contributors!

- @chrismbarr
- @corydeppen
- @danvk
- @janaagaard75
- @mprobst

# v3.12.0-dev.2

- [enhancement] Support TypeScript v2.0.0-dev builds

# v3.12.1

- Stable release containing changes from the last dev release (v3.12.0-dev.1)

# v3.12.0-dev.1

- [bugfix] Fix null reference bug in typedef rule (#1345)

# v3.12.0

- Stable release containing changes from the last dev release (v3.12.0-dev.0)

# v3.12.0-dev.0

- [new-rule] `only-arrow-functions` rule (#1318)
- [new-rule] `no-unused-new` rule (#1316)
- [new-rule-option] `arrow-call-signature` option for `typedef` rule (#1284)
- [enhancement] Metadata for every rule (#1311)
- [enhancement] `typedef` rule is more flexible about the location of typedefs for arrow functions (#1176)
- [enhancement] Failure messages are clearer and more consistent for many rules (#1303, #1307, #1309)
- [bugfix] `no-consecutive-blank-lines` now handles lines with only whitespace correctly (#1249)
- [bugfix] Correctly load `.json` config files that have a BOM (#1338)

Thanks to our contributors!

- @allannienhuis
- @arnaudvalle
- @bencoveney
- @chrismbarr
- @corydeppen
- @HamletDRC
- @JoshuaKGoldberg
- @timbrown81
- @tomduncalf
- @YuichiNukiyama

# v3.11.0

- Stable release containing changes from the last dev release (v3.11.0-dev.0)

# v3.11.0-dev.0

- [new-rule] `linebreak-style` rule (#123)
- [new-rule] `no-mergeable-namespace` rule (#843)
- [enhancement] Add built-in configurations (#1261)
- [enhancement] New vso formatter (#1281)
- [new-rule-option] `ignore-interfaces` option for `semicolon` rule (#1233)
- [bugfix] `no-default-export` rule handles more default export cases (#1241)

Thanks to our contributors!

- @cgwrench
- @HamletDRC
- @lijunle
- @paldepind
- @patsissons
- @schmuli
- @YuichiNukiyama

# v3.10.2

- Stable release containing changes from the last dev release (v3.10.0-dev.2)

# v3.10.0-dev.2

- [bugfix] `member-ordering` rule doesn't crash on methods in class expressions (#1252)
- [bugfix] `ban` rule handles chained methods appropriately (#1234)

Thanks to our contributors!

- @marines

# v3.10.1

- Stable release containing changes from the last dev release (v3.10.0-dev.1)

# v3.10.0-dev.1

- [bugfix] `member-ordering` rule doesn't crash on methods in object literals (#1243)

# v3.10.0

- Stable release containing changes from the last dev release (v3.10.0-dev.0)

# v3.10.0-dev.0

- [new-rule] `new-parens` rule (#1177)
- [new-rule] `no-default-export` rule (#1182)
- [new-rule-option] `order: ...` option for `member-ordering` rule (#1208)
- [new-rule-option] "ignore-for-loop" option for `one-variable-per-declaration` rule (#1204)
- [enhancement] "no-this-in-function-in-method" option renamed to "check-function-in-method" (#1203)
- [bugfix] `semicolon` rule checks export statements (#1155)

Thanks to our contributors!

- @chrismbarr
- @HamletDRC
- @larshp
- @patsissons
- @YuichiNukiyama

# v3.9.0

- Stable release containing changes from the last dev release (v3.9.0-dev.0)

# v3.9.0-dev.0

- [new-rule] `no-namespace` rule (#1133)
- [new-rule] `one-variable-per-declaration` rule (#525)
- [new-rule-option] "ignore-params" option for `no-inferrable-types` rule (#1190)
- [new-rule-option] "no-this-in-function-in-method" option for `no-invalid-this` rule (#1179)
- [enhancement] Single line enable/disable comments (#144)
- [enhancement] Resolve `extends` packages relative to location of configuration file (#1171)
- [enhancement] `Linter` class will throw an error if configuration is of an invalid type (#1167)
- [bugfix] `use-isnan` allows assaignments to `NaN` (#1054)
- [bugfix] `no-unreachable` handles allows hoisted type aliases (#564)
- [bugfix] `member-ordering` rule now checks constructors (#1158)
- [bugfix] `--test` CLI command works correctly with specifiying custom rules (#1195)

Thanks to our contributors!

- @abierbaum
- @HamletDRC
- @inthemill
- @janslow
- @JoshuaKGoldberg
- @mprobst
- @patsissions
- @YuichiNukiyama

# v3.8.1

- Stable release containing changes from the last dev release (v3.8.0-dev.1)

# v3.8.0-dev.1

- [bugfix] Allow JS directives at the start of constructors, getters, and setters (#1159)
- [bugfix] Remove accidentally included performance profiles from published NPM artifact (#1160)

# v3.8.0

- Stable release containing changes from the last dev release (v3.8.0-dev.0)

# v3.8.0-dev.0

- [new-rule] `no-invalid-this` rule (#1105)
- [new-rule] `use-isnan` rule (#1054)
- [new-rule] `no-reference` rule (#1139)
- [new-rule-option] "allow-pascal-case" option for `variable-name` rule (#1079)
- [enhancement] Comments now allowed in `tslint.json` files (#1129)
- [enhancement] Smarter `trailing-comma` behavior (#1122)
- [enhancement] `semicolon` rule more lenient with arrow-function class members (#1076)
- [enhancement] Allow enabling/disabling rules with `//` comments (#1134)
- [enhancement] New checkstyle formatter (#250)
- [enhancement] Clearer message for `no-var-keyword` rule (#1124)
- [bugfix] Loaded configurations are not cached (#1128)
- [bugfix] Allow JS directives at the start of class methods (#1144)

Thanks to our contributors!

- @AndyMoreland
- @chrismbarr
- @HamletDRC
- @JoshuaKGoldberg
- @sshev
- @unional

# v3.7.4

- Stable release containing changes from the last dev release (v3.7.0-dev.5)

# v3.7.0-dev.5

- [bugfix] Allow JS directives in namespaces (#1115)

# v3.7.3

- Stable release containing changes from the last dev release (v3.7.0-dev.4)

# v3.7.0-dev.4

- [bugfix] Downgrade `findup-sync` dependency (#1108)

# v3.7.2

- Stable release containing changes from the last dev release (v3.7.0-dev.3)

# v3.7.0-dev.3

- [bugfix] `findConfigurationPath` always returns an absolute path (#1093)
- [bugfix] Update `findup-sync` dependency (#1080)
- [bugfix] `declare global` no longer triggers `no-internal-module` rule (#1069)
- [bugfix] Valid JS directives no longer trigger `no-unused-expression` rule (#1050)

# v3.7.1

- Stable release containing changes from the last dev release

# v3.7.0-dev.2

- [bugfix] Improve handling of paths provided via the -c CLI option (#1083)

# v3.7.0

- Stable release containing changes from the last dev release

# v3.7.0-dev.1

- [enhancement] `extends` field for `tslint.json` files (#997)
- [enhancement] `--force` CLI option (#1059)
- [enhancement] Improve how `Linter` class handles configurations with a `rulesDirectory` field (#1035)
- [new-rule] `no-angle-bracket-type-assertion` rule (#639)
- [new-rule-option] "allow-undefined-check" option for `triple-equals` rule (#602)
- [new-rule-option] "always-prefix" and "never-prefix" option for `interface-name` rule (#512)

Thanks to our contributors!

- @Arnavion
- @chrismbarr
- @ChrisPearce
- @JoshuaKGoldberg
- @patsissonso
- @sasidhar
- @unional
- @vvakame

# v3.6.0

- Stable release containing changes from the last dev release

# v3.6.0-dev.1

- [enhancement] Add `--exclude` CLI option (#915)
- [bugfix] Fix `no-shadowed-variable` rule handling of standalone blocks (#1021)
- [deprecation] Configuration through `package.json` files (#1020)
- [API] Export additional configuration methods from top-level "tslint" module (#1009)

Thanks to our contributors!

- @blakeembrey
- @hamhut1066
- @meowtec

# v3.5.0

- Stable release containing changes from the last dev release

# v3.5.0-dev.1

- [new-rule-option] "ignore-pattern" option for `no-unused-variable` rule (#314)
- [bugfix] Fix occassional crash in `no-string-literal` rule (#906)
- [enhancement] Tweak behavior of `member-ordering` rule with regards to arrow function types in interfaces (#226)

Thanks to our contributors!

- @arusakov
- @Pajn

# v3.4.0

- Stable release containing changes from the last two dev releases

# v3.4.0-dev.2

- [new-rule-option] "arrow-parameter" option for `typedef` rule (#333)
- [new-rule-option] "never" option for `semicolon` rule (#363)
- [new-rule-option] "onespace" setting for `typedef-whitespace` rule (#888)
- [new-rule-option] `typedef-whitespace` rule can now check spacing on right side of typdef colon (#888)
- [enhancement] `member-ordering` rule treats arrow functions as methods (#226)
- [bugfix] Handle spaces before typedefs correctly in `typedef-whitespace` rule (#955)
- [bugfix] `label-position` rule now allows labels on `for-of` loops (#959)

Thanks to our contributors!

- @b0r3as
- @ChaseMoskal
- @Pajn
- @pe8ter
- @tomduncalf

# v3.4.0-dev.1

- [enhancement] Revamped testing system (#620)
  - Writing tests for rules is now much simpler with a linter DSL. See exisitng tests in `test/rules/**/*.ts.lint` for examples.
- [enhancement] New msbuild formatter (#947)
- [bugfix] Fix handling of multiline literals in `trailing-comma` rule (#856)
- [bugfix] `one-line` rule correctly checks space between `catch` and opening brace (#925)
- [bugfix] `one-line` rule correctly checks multiline variable declarations (#935)
- [new-rule-option] New option `check-finally` for `one-line` rule (#925)
- BREAKING CHANGES
  - [bugfix] Report error when a rule in the config file is not found (#598)

Thanks to our contributors!

- @mmv
- @pe8ter

# v3.3.0

- [bugfix] Tweak TSLint build so TSLint works with typescript@next (#926)

# v3.3.0-dev.1

- [bugfix] Correctly handle more than one custom rules directory (#928)

# v3.2.2

- Stable release containing changes from the last dev release

# v3.2.2-dev.1

- [enhancement] Throw an error if a path to a directory of custom rules is invalid (#910)
- [new-rule-option] "jsx-single" and "jsx-double" options for `quotemark` rule (#673)
- [bugfix] Handle paths to directories of custom rules more accurately
- [bugfix] `no-unused-expression` rule handles `await` statements correctly (#887)

# v3.2.1

- Stable release containing changes from the last dev release

# v3.2.1-dev.1

- [enhancement] automatically generate a `tslint.json` file with new `--init` CLI command (#717)
- [bugfix] `no-var-keyword` rule detects the use of `var` in all types of `for` loops (#855)

# v3.2.0

- Stable release containing changes from last two dev releases

# v3.2.0-dev.2

- [bugfix] formatters are now exported correctly to work with TS 1.8 (#863)

# v3.2.0-dev.1

- [bugfix] fixed bug in how custom rules directories are registered (#844)
- [enhancement] better support for globs in CLI (#827)
- [new-rule] `no-null-keyword` rule (#722)

# v3.1.1

- Bump TypeScript peer dependency to `>= 1.7.3` due to `const enum` incompatibility (#832)

# v3.1.0

- [bugfix] build with TS v1.7.3 to fix null pointer exception (#832)
- [bugfix] fixed false positive in `no-require-imports` rule (#816)

# v3.1.0-dev.1

- [bugfix] fixed `no-shadowed-variable` false positives when handling destructuring in function params (#727)
- [enhancement] `rulesDirectory` in `tslint.json` now supports multiple file paths (#795)

# v3.0.0

- [bugfix] `member-access` rule now handles object literals and get/set accessors properly (#801)
  - New rule options: `check-accessor` and `check-constructor`
- All the changes from the following releases, including some breaking changes:
  - `3.0.0-dev.3`
  - `3.0.0-dev.2`
  - `3.0.0-dev.1`
  - `2.6.0-dev.2`
  - `2.6.0-dev.1`

# v3.0.0-dev.3

- TypeScript is now a peerDependency (#791)
- [bugfix] `no-unused-variable` rule with `react` option works with self-closing JSX tags (#776)
- [bugfix] `use-strict` bugfix (#544)

# v3.0.0-dev.2

- [new-rule-option] "react" option for `no-unused-variable` rule (#698, #725)
- [bugfix] Fix how `Linter` is exported from "tslint" module (#760)
- [bugfix] `no-use-before-declare` rule doesn't crash on uncompilable code (#763)

# v3.0.0-dev.1

- BREAKING CHANGES
  - Rearchitect TSLint to use external modules instead of merged namespaces (#726)
    - Dependencies need to be handled differently now by custom rules and formatters
    - See the PR for full details about this change
  - `no-trailing-comma` rule removed, it is replaced by the `trailing-comma` rule (#687)
  - Rename `sort-object-literal-keys` rule to `object-literal-sort-keys` (#304, #537)
  - `Lint.abstract()` has been removed (#700)
- [new-rule] `trailing-comma` rule (#557, #687)
- [new-rule-option] "ban-keywords" option for `variable-name` rule (#735, #748)
- [bugfix] `typedef` rule now handles `for-of` loops correctly (#743)
- [bugfix] Handle tslint.json utf-8 files which have a BOM correctly (#90)

# v2.6.0-dev.2

- Upgrade TypeScript compiler to `v1.7.0-dev.20151003`
- [bugfix] `no-unused-expression` rule now handles yield expressions properly (#706)

# v2.6.0-dev.1

- Upgrade TypeScript compiler to `v1.7.0-dev.20150924`

# v2.5.1

- [new-rule] no-inferrable-types rule (#676)
- [new-rule-option] "avoid-escape" option for quotemark rule (#543)
- [bugfix] type declaration for tslint external module #686
- [enhancement] `AbstractRule` and `AbstractFormatter` are now abstract classes (#631)
  - Note: `Lint.abstract()` is now deprecated

# v2.5.0

- Use TypeScript compiler `v1.6.2`
- [bugfixes] #637, #642, #650, #652
- [bugfixes] fix various false positives in `no-unused-variable` rule (#570, #613, #663)
- Update project setup for latest VSCode (#662)

# v2.5.0-beta

- Use TypeScript compiler `v1.6.0-beta`
- [bugfix] Fix `no-internal-module` false positives on nested namespaces (#600)
- [docs] Add documentation for `sort-object-literal-keys` rule

# v2.5.0-dev.5

- Upgrade TypeScript compiler to `v1.7.0-dev.20150828`
- [bugfix] Handle .tsx files appropriately (#597, #558)

# v2.5.0-dev.4

- Upgrade TypeScript compiler to `v1.6.0-dev.20150825`

# v2.5.0-dev.3

- Upgrade TypeScript compiler to `v1.6.0-dev.20150821`

# v2.5.0-dev.2

- Upgrade TypeScript compiler to `v1.6.0-dev.20150811`
- [bug] fix `whitespace` false positive in JSX elements (#559)

# v2.5.0-dev.1

- Upgrade TypeScript compiler to `v1.6.0-dev.20150805`
- [enhancement] Support `.tsx` syntax (#490)

# v2.4.5

- [bugfix] fix false positives on `no-shadowed-variable` rule (#500)
- [enhancement] add `allow-trailing-underscore` option to `variable-name` rule

# v2.4.4

- [bugfix] remove "typescript" block from package.json (#606)

# v2.4.3

- [new-rule] `no-conditional-assignment` (#507)
- [new-rule] `member-access` (#552)
- [new-rule] `no-internal-module` (#513)
- [bugfix] small fixes to `sample.tslint.json` (#545)
- [bugfix] fix README docs for quotemark and indent (#523)
- [enhancement] update `findup-sync` and `underscore.string` dependencies
- [enhancement] add `"typescript"` field to `package.json` (#560)
- [enhancement] small improvements to CLI help text
- [enhancement] expose raw failures array in the JS API (#477)

# v2.4.2

- [bug] remove npm-shrinkwrap.json from the published package

# v2.4.0

- Upgraded Typescript compiler to 1.5.3
- [bugs] #332, #493, #509, #483
- [bug] fix error message in `no-var-keyword` rule
- [enhancement] CI tests are now run on node v0.12 in addition to v0.10
- BREAKING
  - `-f` option removed from CLI

# v2.3.1-beta

- [bugs] #137 #434 #451 #456
- [new-rule] `no-require-imports` disallows `require()` style imports
- [new-rule] `no-shadowed-variable` moves over shadowed variable checking from `no-duplicate-variable` into its own rule
- BREAKING
  - `no-duplicate-variable` now only checks for duplicates within the same block scope; enable `no-shadowed-variable` to get duplicate-variable checking across block scopes
- [enhancement] `no-duplicate-variable`, `no-shadowed-variable`, and `no-use-before-declare` now support ES6 destructuring
- [enhancement] tslint CLI now uses a default configuration if no config file is found

# v2.3.0-beta

- [bugs] #401 #367 #324 #352
- [new-rule] `no-var-keyword` disallows `var` in favor of `let` and `const`
- [new-rule] `sort-object-literal-keys` forces object-literal keys to be sorted alphabetically
- Add support for ES6 destructuring and module syntax (affects `variable-name`, `no-use-before-declare`, `whitespace` and `no-unused-variable`)
- Add support for ES6 for-of and spread operator syntax
- Use tsconfig.json & JSCS in the build system

# v2.2.0-beta

- Upgraded Typescript compiler to 1.5.0-beta
- BREAKING CHANGES
  - due to changes to the typescript compiler API, old custom rules may no longer work and may need to be rewritten
  - the JSON formatter's line and character positions are now back to being 0-indexed instead of 1-indexed
- [bugs] #328 #334 #319 #351 #365 #254
- [bug] fixes for tslint behavior around template strings (fixes #357, #349, #332, and more)
- [new-rule] `align` rule now enforces vertical alignment on parameters, arguments, and statements
- [new-rule] `switch-default` enforces a `default` case in `switch` statements
- [feature] `no-duplicate-variable` rule now additionally checks if function parameters have been shadowed
- Additional fixes to existing rules to work as before with the typescript 1.5 compiler

# v2.1.1

- [bugs] #292 #293 #295 #301 #302
- Some internal refactoring
- Added Windows CI testing (appveyor)

# v2.1.0

- Fix crash on Windows

# v2.0.1

- Upgraded Typescript compiler to 1.4
- BREAKING CHANGES
  - typedef rule options were modified:
    - index-signature removed as no longer necessary
    - property-signature renamed to property-declaration
    - variable-declarator renamed to variable-declaration
    - member-variable-declarator renamed to member-variable-declaration
  - typedef-whitespace rule options were modified:
    - catch-clause was removed as invalid
    - further options were added, see readme for more details
  - due to changes to the typescript compiler API, old custom rules may no longer work and may need to be rewritten
  - the JSON formatter's line and character positions are now 1-indexed instead of 0-indexed

# v1.2.0

- [bug] #245

# v1.0.1

- [bug] #238

# v1.0.0

- upgrade TypeScript compiler to 1.3
- BREAKING CHANGES
  - all error messages now start with a lower-case character and do not end with a period
  - all rule options are consistent in nomenclature. The `typedef` and `typedef-whitespace` rules now take in hyphenated options
  - `unused-variables` rule cannot find unused private variables defined in the constructor due to a bug in 1.3 compiler
  - `indent` rule has changed to only check for tabs or spaces and not enforce indentation levels

# v0.4.12

- multiple files with -f on cli
- config file search starts with input file

# v0.4.11

- [bugs] #136, #163
- internal refactors

# v0.4.10

- [bugs] #138, #145, #146, #148

# v0.4.9

- [new-rule] `no-any` disallows all uses of `any`
- [bug] `/* tslint:disable */` now disables semicolon rule as well
- [bug] delete operator no longer results in a false positive for `no-unused-expression`

# v0.4.8

- [new-rule] `no-var-requires` disallows require statements not part of an import statement
- [new-rule] `typedef` rule also checks for member variables
- [bug] `no-unused-variable` no longer triggers false positives for class members labeled only `static`
- [bug] `no-unused-expression` no longer triggers false positives for `"use strict";` expressions
- [bug] `use-strict` works correctly on function declarations
- [bug] config file is now discoverable from other drives on Windows

# v0.4.7

- [new-rule] added `no-unused-expression` rule which disallows unused expression statements
- [feature] the `check-operator` option for the `whitespace` rule now checks whitespace around the => token
- [bug] `no-use-before-declare-rule` no longer triggers false positives for member variables of classes used before the class is declared
- [bug] semicolon at end of file no longer triggers false positives for `whitespace` rule
- [bug] hoisted functions no longer cause false positives for the `no-unreachable` rule
- [bug] the rule loader no longer transforms/ignores the leading and trailing underscores and dashes of rule names in the config file
- [bug] `export import` statements no longer false positives for `no-unused-variable-rule`
- [docs] added documentation for creating custom rules and formatters
- [docs] added sample `tslint.json` file, under `docs/sample.tslint.json`

# v0.4.6

- [build] migrated build to use `grunt-ts` instead of `grunt-typescript`
- [feature] `package.json` now contains a `tslintConfig` paramater to allow users to specify the location of the configuration file there
- [feature] tslint now searches for the configuration file in the user's home directory if not found in the current path
- [bug] unbraced conditionals no longer cause false positives for the `no-unreachable` rule

# v0.4.5

- [feature] `no-unused-variable` no longer checks parameters by default. Parameters are now only checked if the `check-parameters` option is set.
- [bug] `no-unused-variable` parameter check no longer fails on variable argument parameters (like ...args) and on cases where the parameters are broken up by newlines.

# v0.4.4

- [bug] `no-unused-variable` validates function parameters and constructor methods
- [bug] `no-empty` and `no-trailing-comma` rules handle empty objects

# v0.4.3

- [new-rule] `no-unused-variable`
- [new-rule] `no-trailing-comma`
- [new-rule] `no-use-before-declare`
- [feature] support `--version` in CLI
- [feature] expose rule names to custom formatters
- [feature] add `verbose` formatter
- [bug] `no-empty` allows constructors with member declaration parameters
- [bug] CLI supports `--help`
- [bug] `max-line-length` allows CRLF endings