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This version is a republished version of v2.8.7.
A bad version was accidentally published and it can't be unpublished, apologies for the churn.

`v2.8.7`

Allow multiple decorators on same getter/setter (#14584 by @fisker)

// Input
class A {
  @&#8203;decorator()
  get foo () {}
  
  @&#8203;decorator()
  set foo (value) {}
}

// Prettier 2.8.6
SyntaxError: Decorators cannot be applied to multiple get/set accessors of the same name. (5:3)
  3 |   get foo () {}
  4 |   
> 5 |   @&#8203;decorator()
    |   ^^^^^^^^^^^^
  6 |   set foo (value) {}
  7 | }

// Prettier 2.8.7
class A {
  @&#8203;decorator()
  get foo() {}

  @&#8203;decorator()
  set foo(value) {}
}

`v2.8.6`

Allow decorators on private members and class expressions (#14548 by @fisker)

// Input
class A {
  @&#8203;decorator()
  #privateMethod () {}
}

// Prettier 2.8.5
SyntaxError: Decorators are not valid here. (2:3)
  1 | class A {
> 2 |   @&#8203;decorator()
    |   ^^^^^^^^^^^^
  3 |   #privateMethod () {}
  4 | }

// Prettier 2.8.6
class A {
  @&#8203;decorator()
  #privateMethod() {}
}

`v2.8.5`

Support TypeScript 5.0 (#14391 by @fisker, #13819 by @fisker, @sosukesuzuki)

TypeScript 5.0 introduces two new syntactic features:

const modifiers for type parameters
export type * declarations

Add missing parentheses for decorator (#14393 by @fisker)

// Input
class Person {
  @&#8203;(myDecoratorArray[0])
  greet() {}
}

// Prettier 2.8.4
class Person {
  @&#8203;myDecoratorArray[0]
  greet() {}
}

// Prettier 2.8.5
class Person {
  @&#8203;(myDecoratorArray[0])
  greet() {}
}

Add parentheses for `TypeofTypeAnnotation` to improve readability (#14458 by @fisker)

// Input
type A = (typeof node.children)[];

// Prettier 2.8.4
type A = typeof node.children[];

// Prettier 2.8.5
type A = (typeof node.children)[];

Support `max_line_length=off` when parsing `.editorconfig` (#14516 by @josephfrazier)

If an .editorconfig file is in your project and it sets max_line_length=off for the file you're formatting,
it will be interpreted as a printWidth of Infinity rather than being ignored
(which previously resulted in the default printWidth of 80 being applied, if not overridden by Prettier-specific configuration).

<!-- Input -->
<div className='HelloWorld' title={`You are visitor number ${ num }`} onMouseOver={onMouseOver}/>

<!-- Prettier 2.8.4 -->
<div
  className="HelloWorld"
  title={`You are visitor number ${num}`}
  onMouseOver={onMouseOver}
/>;

<!-- Prettier 2.8.5 -->
<div className="HelloWorld" title={`You are visitor number ${num}`} onMouseOver={onMouseOver} />;

`v2.8.4`

Fix leading comments in mapped types with `readonly` (#13427 by @thorn0, @sosukesuzuki)

// Input
type Type = {
  // comment
  readonly [key in Foo];
};

// Prettier 2.8.3
type Type = {
  readonly // comment
  [key in Foo];
};

// Prettier 2.8.4
type Type = {
  // comment
  readonly [key in Foo];
};

Group params in opening block statements (#14067 by @jamescdavis)

This is a follow-up to #13930 to establish wrapping consistency between opening block statements and else blocks by
grouping params in opening blocks. This causes params to break to a new line together and not be split across lines
unless the length of params exceeds the print width. This also updates the else block wrapping to behave exactly the
same as opening blocks.

{{! Input }}
{{#block param param param param param param param param param param as |blockParam|}}
  Hello
{{else block param param param param param param param param param param as |blockParam|}}
  There
{{/block}}

{{! Prettier 2.8.3 }}
{{#block
  param
  param
  param
  param
  param
  param
  param
  param
  param
  param
  as |blockParam|
}}
  Hello
{{else block param
param
param
param
param
param
param
param
param
param}}
  There
{{/block}}

{{! Prettier 2.8.4 }}
{{#block
  param param param param param param param param param param
  as |blockParam|
}}
  Hello
{{else block
  param param param param param param param param param param
  as |blockParam|
}}
  There
{{/block}}

Ignore files in `.sl/` (#14206 by @bolinfest)

In Sapling SCM, .sl/ is the folder where it stores its state, analogous to .git/ in Git. It should be ignored in Prettier like the other SCM folders.

Recognize `@satisfies` in Closure-style type casts (#14262 by @fisker)

// Input
const a = /** @&#8203;satisfies {Record<string, string>} */ ({hello: 1337});
const b = /** @&#8203;type {Record<string, string>} */ ({hello: 1337});

// Prettier 2.8.3
const a = /** @&#8203;satisfies {Record<string, string>} */ { hello: 1337 };
const b = /** @&#8203;type {Record<string, string>} */ ({ hello: 1337 });

// Prettier 2.8.4
const a = /** @&#8203;satisfies {Record<string, string>} */ ({hello: 1337});
const b = /** @&#8203;type {Record<string, string>} */ ({hello: 1337});

Fix parens in inferred function return types with `extends` (#14279 by @fisker)

// Input
type Foo<T> = T extends ((a) => a is infer R extends string) ? R : never;

// Prettier 2.8.3 (First format)
type Foo<T> = T extends (a) => a is infer R extends string ? R : never;

// Prettier 2.8.3 (Second format)
SyntaxError: '?' expected. 

// Prettier 2.8.4
type Foo<T> = T extends ((a) => a is infer R extends string) ? R : never;

`v2.8.3`

Allow self-closing tags on custom elements (#14170 by @fisker)

See Angular v15.1.0 release note for details.

// Input
<app-test/>

// Prettier 2.8.2
SyntaxError: Only void and foreign elements can be self closed "app-test" (1:1)
> 1 | <app-test/>
    | ^^^^^^^^^
  2 |

// Prettier 2.8.3
<app-test />

`v2.8.2`

Don't lowercase link references (#13155 by @DerekNonGeneric & @fisker)

<!-- Input -->
We now don't strictly follow the release notes format suggested by [Keep a Changelog].

[Keep a Changelog]: https://example.com/

<!-- Prettier 2.8.1 -->
We now don't strictly follow the release notes format suggested by [Keep a Changelog].

[keep a changelog]: https://example.com/
<!--
^^^^^^^^^^^^^^^^^^ lowercased
-->

<!-- Prettier 2.8.2 -->
<Same as input>

Preserve self-closing tags (#13691 by @dcyriller)

{{! Input }}
<div />
<div></div>
<custom-component />
<custom-component></custom-component>
<i />
<i></i>
<Component />
<Component></Component>

{{! Prettier 2.8.1 }}
<div></div>
<div></div>
<custom-component></custom-component>
<custom-component></custom-component>
<i></i>
<i></i>
<Component />
<Component />

{{! Prettier 2.8.2 }}
<div />
<div></div>
<custom-component />
<custom-component></custom-component>
<i />
<i></i>
<Component />
<Component />

Allow custom "else if"-like blocks with block params (#13930 by @jamescdavis)

#13507 added support for custom block keywords used with else, but failed to allow block params. This updates printer-glimmer to allow block params with custom "else if"-like blocks.

{{! Input }}
{{#when isAtWork as |work|}}
  Ship that
  {{work}}!
{{else when isReading as |book|}}
  You can finish
  {{book}}
  eventually...
{{else}}
  Go to bed!
{{/when}}

{{! Prettier 2.8.1 }}
{{#when isAtWork as |work|}}
  Ship that
  {{work}}!
{{else when isReading}}
  You can finish
  {{book}}
  eventually...
{{else}}
  Go to bed!
{{/when}}

{{! Prettier 2.8.2 }}
{{#when isAtWork as |work|}}
  Ship that
  {{work}}!
{{else when isReading as |book|}}
  You can finish
  {{book}}
  eventually...
{{else}}
  Go to bed!
{{/when}}

Preserve empty lines between nested SCSS maps (#13931 by @jneander)

/* Input */
$map: (
  'one': (
     'key': 'value',
  ),

  'two': (
     'key': 'value',
  ),
)

/* Prettier 2.8.1 */
$map: (
  'one': (
     'key': 'value',
  ),
  'two': (
     'key': 'value',
  ),
)

/* Prettier 2.8.2 */
$map: (
  'one': (
     'key': 'value',
  ),

  'two': (
     'key': 'value',
  ),
)

Fix missing parentheses when an expression statement starts with `let[` (#14000, #14044 by @fisker, @thorn0)

// Input
(let[0] = 2);

// Prettier 2.8.1
let[0] = 2;

// Prettier 2.8.1 (second format)
SyntaxError: Unexpected token (1:5)
> 1 | let[0] = 2;
    |     ^
  2 |

// Prettier 2.8.2
(let)[0] = 2;

Fix semicolon duplicated at the end of LESS file (#14007 by @mvorisek)

// Input
@&#8203;variable: {
  field: something;
};

// Prettier 2.8.1
@&#8203;variable: {
  field: something;
}; ;

// Prettier 2.8.2
@&#8203;variable: {
  field: something;
};

Fix no space after unary minus when followed by opening parenthesis in LESS (#14008 by @mvorisek)

// Input
.unary_minus_single {
  margin: -(@&#8203;a);
}

.unary_minus_multi {
  margin: 0 -(@&#8203;a);
}

.binary_minus {
  margin: 0 - (@&#8203;a);
}

// Prettier 2.8.1
.unary_minus_single {
  margin: - (@&#8203;a);
}

.unary_minus_multi {
  margin: 0 - (@&#8203;a);
}

.binary_minus {
  margin: 0 - (@&#8203;a);
}

// Prettier 2.8.2
.unary_minus_single {
  margin: -(@&#8203;a);
}

.unary_minus_multi {
  margin: 0 -(@&#8203;a);
}

.binary_minus {
  margin: 0 - (@&#8203;a);
}

Do not change case of property name if inside a variable declaration in LESS (#14034 by @mvorisek)

// Input
@&#8203;var: {
  preserveCase: 0;
};

// Prettier 2.8.1
@&#8203;var: {
  preservecase: 0;
};

// Prettier 2.8.2
@&#8203;var: {
  preserveCase: 0;
};

Fix formatting for auto-accessors with comments (#14038 by @fisker)

// Input
class A {
  @&#8203;dec()
  // comment
  accessor b;
}

// Prettier 2.8.1
class A {
  @&#8203;dec()
  accessor // comment
  b;
}

// Prettier 2.8.1 (second format)
class A {
  @&#8203;dec()
  accessor; // comment
  b;
}

// Prettier 2.8.2
class A {
  @&#8203;dec()
  // comment
  accessor b;
}

Add parentheses for TSTypeQuery to improve readability (#14042 by @onishi-kohei)

// Input
a as (typeof node.children)[number]
a as (typeof node.children)[]
a as ((typeof node.children)[number])[]

// Prettier 2.8.1
a as typeof node.children[number];
a as typeof node.children[];
a as typeof node.children[number][];

// Prettier 2.8.2
a as (typeof node.children)[number];
a as (typeof node.children)[];
a as (typeof node.children)[number][];

Fix displacing of comments in default switch case (#14047 by @thorn0)

It was a regression in Prettier 2.6.0.

// Input
switch (state) {
  default:
    result = state; // no change
    break;
}

// Prettier 2.8.1
switch (state) {
  default: // no change
    result = state;
    break;
}

// Prettier 2.8.2
switch (state) {
  default:
    result = state; // no change
    break;
}

Support type annotations on auto accessors via `babel-ts` (#14049 by @sosukesuzuki)

The bug that @babel/parser cannot parse auto accessors with type annotations has been fixed. So we now support it via babel-ts parser.

class Foo {
  accessor prop: number;
}

Fix formatting of empty type parameters (#14073 by @fisker)

// Input
const foo: bar</* comment */> = () => baz;

// Prettier 2.8.1
Error: Comment "comment" was not printed. Please report this error!

// Prettier 2.8.2
const foo: bar</* comment */> = () => baz;

Add parentheses to head of `ExpressionStatement` instead of the whole statement (#14077 by @fisker)

// Input
({}).toString.call(foo) === "[object Array]"
  ? foo.forEach(iterateArray)
  : iterateObject(foo);

// Prettier 2.8.1
({}.toString.call(foo) === "[object Array]"
  ? foo.forEach(iterateArray)
  : iterateObject(foo));

// Prettier 2.8.2
({}).toString.call(foo.forEach) === "[object Array]"
  ? foo.forEach(iterateArray)
  : iterateObject(foo);

Fix comments after directive (#14081 by @fisker)

// Input
"use strict" /* comment */;

// Prettier 2.8.1 (with other js parsers except `babel`)
Error: Comment "comment" was not printed. Please report this error!

// Prettier 2.8.2
<Same as input>

Fix formatting for comments inside JSX attribute (#14082 by @fisker)

// Input
function MyFunctionComponent() {
  <button label=/*old*/"new">button</button>
}

// Prettier 2.8.1
Error: Comment "old" was not printed. Please report this error!

// Prettier 2.8.2
function MyFunctionComponent() {
  <button label=/*old*/ "new">button</button>;
}

Quote numeric keys for json-stringify parser (#14083 by @fisker)

// Input
{0: 'value'}

// Prettier 2.8.1
{
  0: "value"
}

// Prettier 2.8.2
{
  "0": "value"
}

Fix removing commas from function arguments in maps (#14089 by @sosukesuzuki)

/* Input */
$foo: map-fn(
  (
    "#{prop}": inner-fn($first, $second),
  )
);

/* Prettier 2.8.1 */
$foo: map-fn(("#{prop}": inner-fn($first $second)));

/* Prettier 2.8.2 */
$foo: map-fn(
  (
    "#{prop}": inner-fn($first, $second),
  )
);

Do not insert space in LESS property access (#14103 by @fisker)

// Input
a {
  color: @&#8203;colors[@&#8203;white];
}

// Prettier 2.8.1
a {
  color: @&#8203;colors[ @&#8203;white];
}

// Prettier 2.8.2
<Same as input>

`v2.8.1`

Fix SCSS map in arguments (#9184 by @agamkrbit)

// Input
$display-breakpoints: map-deep-merge(
  (
    "print-only": "only print",
    "screen-only": "only screen",
    "xs-only": "only screen and (max-width: #{map-get($grid-breakpoints, "sm")-1})",
  ),
  $display-breakpoints
);

// Prettier 2.8.0
$display-breakpoints: map-deep-merge(
  (
    "print-only": "only print",
    "screen-only": "only screen",
    "xs-only": "only screen and (max-width: #{map-get($grid-breakpoints, " sm
      ")-1})",
  ),
  $display-breakpoints
);

// Prettier 2.8.1
$display-breakpoints: map-deep-merge(
  (
    "print-only": "only print",
    "screen-only": "only screen",
    "xs-only": "only screen and (max-width: #{map-get($grid-breakpoints, "sm")-1})",
  ),
  $display-breakpoints
);

Support auto accessors syntax (#13919 by @sosukesuzuki)

Support for Auto Accessors Syntax landed in TypeScript 4.9.

(Doesn't work well with babel-ts parser)

class Foo {
  accessor foo: number = 3;
}

`v2.8.0`

`v2.7.1`

Keep useful empty lines in description (#13013 by @chimurai)

`v2.7.0`

"""
First line
Second Line
"""
type Person {
name: String
}

`v2.6.2`

Fix LESS/SCSS format error (#12536 by @fisker)

// Input
.background-gradient(@&#8203;cut) {
    background: linear-gradient(
        to right,
        @&#8203;white 0%,
        @&#8203;white (@&#8203;cut - 0.01%),
        @&#8203;portal-background @&#8203;cut,
        @&#8203;portal-background 100%
    );
}

// Prettier 2.6.1
TypeError: Cannot read properties of undefined (reading 'endOffset')

// Prettier 2.6.2
.background-gradient(@&#8203;cut) {
  background: linear-gradient(
    to right,
    @&#8203;white 0%,
    @&#8203;white (@&#8203;cut - 0.01%),
    @&#8203;portal-background @&#8203;cut,
    @&#8203;portal-background 100%
  );
}

Update `meriyah` to fix several bugs (#12567 by @fisker, fixes in `meriyah` by @3cp)

Fixes bugs when parsing following valid code:

foo(await bar());

const regex = /.*/ms;

const element = <p>{/w/.test(s)}</p>;

class A extends B {
  #privateMethod() {
    super.method();
  }
}

`v2.6.1`

Ignore `loglevel` when printing information (#12477 by @fisker)

`v2.6.0`

prettier --loglevel silent --find-config-path index.js

`v2.5.1`

Improve formatting for empty tuple types (#11884 by @sosukesuzuki)

// Input
type Foo =
  Foooooooooooooooooooooooooooooooooooooooooooooooooooooooooo extends []
    ? Foo3
    : Foo4;

// Prettier 2.5.0
type Foo = Foooooooooooooooooooooooooooooooooooooooooooooooooooooooooo extends [

]
  ? Foo3
  : Foo4;

// Prettier 2.5.0 (tailingCommma = all)
// Invalid TypeScript code
type Foo = Foooooooooooooooooooooooooooooooooooooooooooooooooooooooooo extends [
  ,
]
  ? Foo3
  : Foo4;

// Prettier 2.5.1
type Foo =
  Foooooooooooooooooooooooooooooooooooooooooooooooooooooooooo extends []
    ? Foo3
    : Foo4;

Fix compatibility with Jest inline snapshot test (#11892 by @fisker)

A internal change in Prettier@v2.5.0 accidentally breaks the Jest inline snapshot test.

Support Glimmer's named blocks (#11899 by @duailibe)

Prettier already supported this feature, but it converted empty named blocks to self-closing, which is not supported by the Glimmer compiler.

See: Glimmer's named blocks.

// Input
<Component>
  <:named></:named>
</Component>

// Prettier 2.5.0
<Component>
  <:named />
</Component>

// Prettier 2.5.1
<Component>
  <:named></:named>
</Component>

`v2.5.0`

`v2.4.1`

Fix wildcard syntax in `@forward` (#11482) (#11487 by @niksy)

// Input
@&#8203;forward "library" as btn-*;

// Prettier 2.4.0
@&#8203;forward "library" as btn- *;

// Prettier 2.4.1
@&#8203;forward "library" as btn-*;

Add new CLI option `debug-print-ast` (#11514 by @sosukesuzuki)

A new --debug-print-ast CLI flag for debugging.

`v2.4.0`

`v2.3.2`

Fix failure on dir with trailing slash (#11000 by @fisker)

$ ls
1.js  1.unknown

`v2.3.1`

$ prettier . -l
1.js
$ prettier ./ -l
[error] No supported files were found in the directory: "./".

`v2.3.0`

`v2.2.1`

Fix formatting for AssignmentExpression with ClassExpression (#9741 by @sosukesuzuki)

// Input
module.exports = class A extends B {
  method() {
    console.log("foo");
  }
};

// Prettier 2.2.0
module.exports = class A extends (
  B
) {
  method() {
    console.log("foo");
  }
};

// Prettier 2.2.1
module.exports = class A extends B {
  method() {
    console.log("foo");
  }
};

`v2.2.0`

`v2.1.2`

Fix formatting for directives in fields (#9116 by @sosukesuzuki)

`v2.1.1`

Fix format on html with frontMatter (#9043 by @fisker)

<!-- Input -->
---
layout: foo
---

Test <a
href="https://prettier.io">abc</a>.

<!-- Prettier stable -->
TypeError: Cannot read property 'end' of undefined
  ...

<!-- Prettier master -->
---
layout: foo
---

Test <a href="https://prettier.io">abc</a>.

Fix broken format for `...infer T` (#9044 by @fisker)

// Input
type Tail<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

// Prettier stable
type Tail<T extends any[]> = T extends [infer U, ...(infer R)] ? R : never;

// Prettier master
type Tail<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

Fix format on `style[lang="sass"]` (#9051 by @fisker)

<!-- Input -->
<style lang="sass">
.hero
  @&#8203;include background-centered
</style>

<!-- Prettier stable -->
<style lang="sass">
.hero @&#8203;include background-centered;
</style>

<!-- Prettier master -->
<style lang="sass">
  .hero
    @&#8203;include background-centered
</style>

Fix self-closing blocks and blocks with `src` attribute format (#9052, #9055 by @fisker)

<!-- Input -->
<custom lang="markdown" src="./foo.md"></custom>
<custom lang="markdown" src="./foo.md" />
<custom lang="markdown" />

<!-- Prettier stable -->
<custom lang="markdown" src="./foo.md">

</custom>
<custom lang="markdown" src="./foo.md"

/>
<custom lang="markdown"

/>

<!-- Prettier master -->
<custom lang="markdown" src="./foo.md"></custom>
<custom lang="markdown" src="./foo.md" />
<custom lang="markdown" />

`v2.1.0`

`v2.0.5`

Less: Fix formatting of `:extend` (#7984 by @fisker)

// Input
.class {
  &:extend(.some-class .some-other-class .some-very-loooooooooooooong-class all);
}

// Prettier 2.0.4
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

// Prettier 2.0.4 (Second format)
.class {
  &: extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

// Prettier 2.0.5
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

Editor integration: Use `resolve` if builtin `require.resolve` is overridden (#8072 by @fisker)

This fixes issues that the users of Atom and WebStorm faced with 2.0.4.

Prettier now switches to using the resolve module for resolving configuration files and plugins if it detects that require.resolve isn't Node's builtin function (doesn't support the second argument), which happens in environments like editor extensions. To force the fallback, set the PRETTIER_FALLBACK_RESOLVE environment variable to true.

`v2.0.4`

Revert #7869, "[TypeScript] format TSAsExpression with same logic as BinaryExpression" (#7958)

`v2.0.3`

JavaScript

Fix `prettier-ignore` inside JSX (#7877 by @fisker)

// Input
<div>
{
  /* prettier-ignore */
  x     ?   <Y/> : <Z/>
}
</div>;

// Prettier 2.0.2 (first output)
<div>
  {/* prettier-ignore */
  x     ?   <Y/> : <Z/>}
</div>;

// Prettier 2.0.2 (second output)
<div>{/* prettier-ignore */ x     ?   <Y/> : <Z/>}</div>;

// Prettier 2.0.3
<div>
  {
    /* prettier-ignore */
    x     ?   <Y/> : <Z/>
  }
</div>;

Fix regressions in styled-components template literals (#7883 by @thorn0)

// Input
const Icon = styled.div`
  background:   var(--${background});
  ${Link}:not(:first-child) {
      fill:    rebeccapurple;
  }
`;

// Prettier 2.0.2
const Icon = styled.div`
  background: var(-- ${background});
  ${Link}:not (:first-child) {
    fill: rebeccapurple;
  }
`;

// Prettier 2.0.3
const Icon = styled.div`
  background: var(--${background});
  ${Link}:not(:first-child) {
    fill: rebeccapurple;
  }
`;

Fix: line endings were not always converted properly in multiline strings and comments (#7891 by @sidharthv96)

// Input
export const IAmIncredibleLongFunctionName = IAmAnotherFunctionName(<CRLF>
  (_0: IAmIncredibleLongParameterType) => {<CRLF>
    setTimeout(() => {<CRLF>
      /*<CRLF>
        Multiline comment<CRLF>
        Multiline comment<CRLF>
        Multiline comment<CRLF>
      */<CRLF>
      console.log(<CRLF>
        "Multiline string\<CRLF>
         Multiline string\<CRLF>
         Multiline string"<CRLF>
      );<CRLF>
    });<CRLF>
  }<CRLF>
);<CRLF>

// Prettier 2.0.2
export const IAmIncredibleLongFunctionName = IAmAnotherFunctionName(<CRLF>
  (_0: IAmIncredibleLongParameterType) => {<CRLF>
    setTimeout(() => {<CRLF>
      /*<LF>
        Multiline comment<LF>
        Multiline comment<LF>
        Multiline comment<LF>
      */<CRLF>
      console.log(<CRLF>
        "Multiline string\<LF>
         Multiline string\<LF>
         Multiline string"<CRLF>
      );<CRLF>
    });<CRLF>
  }<CRLF>
);<CRLF>

// Prettier 2.0.3: same as input

Fix bug with holes in array literals (#7911 by @bakkot)

// Input
new Test()
  .test()
  .test([, 0])
  .test();

// Prettier 2.0.2
[error] in.js: TypeError: Cannot read property 'type' of null

// Prettier 2.0.3
new Test().test().test([, 0]).test();

TypeScript

Wrap TSAsExpression (#7869 by @sosukesuzuki)

// Input
const value = thisIsAnIdentifier as ThisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;

// Prettier 2.0.2
const value = thisIsAnIdentifier as ThisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;

// Prettier 2.0.3
const value =
  thisIsAnIdentifier as
  ThisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;

Flow

Print dangling comments for inexact object type (#7892 by @sosukesuzuki)

// Input
type Foo = {
  // comment
  ...,
};

// Prettier 2.0.2
Error: Comment "comment" was not printed. Please report this error!

// Prettier 2.0.3
type Foo = {
  // comment
  ...,
};

Do not add comma for explicit inexact object with indexer property or no properties (#7923 by @DmitryGonchar)

// Input
type T = {
  [string]: number,
  ...,
}

type T = {
  // comment
  ...,
}

// Prettier 2.0.2
type T = {
  [string]: number,
  ...,
}

type T = {
  // comment
  ...,
}

// Prettier 2.0.3
type T = {
  [string]: number,
  ...
}

type T = {
  // comment
  ...
}

HTML

Fix printing of ignored empty inline elements (#7867 by @fisker)

<!-- Input-->
<!--prettier-ignore--><span></span>
<!--prettier-ignore--><span>_</span>

<!-- Prettier 2.0.2 (first output) -->
<!--prettier-ignore--><span
></span>
<!--prettier-ignore--><span>_</span>

<!-- Prettier 2.0.2 (second output) -->
<!--prettier-ignore--><span

></span>
<!--prettier-ignore--><span>_</span>

<!-- Prettier 2.0.3 -->
<!--prettier-ignore--><span></span>
<!--prettier-ignore--><span>_</span>

Format `script` and `style` inside tags with a colon in the name (#7916 by @fisker)

<!-- Input -->
<with:colon>
<script>function foo(){      return 1}</script>
<style>a         {color:         #f00}</style>
</with:colon>

<!-- Prettier 2.0.2 -->
<with:colon>
  <script>
    function foo(){ return 1}
  </script>
  <style>
    a {color: #f00}
  </style>
</with:colon>

<!-- Prettier 2.0.3 -->
<with:colon>
  <script>
    function foo() {
      return 1;
    }
  </script>
  <style>
    a {
      color: #f00;
    }
  </style>
</with:colon>

Other changes

Workaround for require.resolve in prettier-vscode (#7951 by @thorn0)
Fix unstable Angular expression binding (#7924 by @fisker)
Update isSCSS regex (#7922 by @fisker)
Fix formatting of empty files (#7921 by @fisker)

`v2.0.2`

2.0 regressions

JavaScript: Fix formatting of pseudo-elements and pseudo-classes in styled-components template literals (#7842 by @thorn0)

// Input
const Foo = styled.div`
  ${media.smallDown}::before {}
`;

// Prettier 2.0.0
const Foo = styled.div`
  ${media.smallDown}: : before{
  }
`;

// Prettier 2.0.2
const Foo = styled.div`
  ${media.smallDown}::before {
  }
`;

TypeScript: Avoid trailing commas on index signatures with only one parameter (#7836 by @bakkot)

TypeScript index signatures technically allow multiple parameters and trailing commas, but it's an error to have multiple parameters there, and Babel's TypeScript parser does not accept them. So Prettier now avoids putting a trailing comma there when you have only one parameter.

// Input
export type A = {
  a?: {
    [
      x: string
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

// Prettier 2.0.0
export type A = {
  a?: {
    [
      x: string,
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

// Prettier 2.0.2
export type A = {
  a?: {
    [
      x: string
    ]: typeof SomeLongLongLongTypeName[keyof typeof SomeLongLongLongTypeName];
  } | null;
};

Revert "markdown: fix redundant leading spaces in markdown list" (#7847)

See #7846

Other changes

TypeScript: Fix `prettier-ignore` in union types (#7798 by @thorn0)

// Input
export type a =
  // foo
  | foo1&foo2
  // prettier-ignore
  | bar1&bar2
  // baz
  | baz1&baz2;

// Prettier 2.0.0
export type a =
  // foo
  | foo1&foo2
    // prettier-ignore
  // prettier-ignore
  | (bar1 & bar2)
  // baz
  | (baz1 & baz2);

// Prettier 2.0.2
export type a =
  // foo
  | (foo1 & foo2)
  // prettier-ignore
  | bar1&bar2
  // baz
  | (baz1 & baz2);

`v2.0.1`

API: Fix build script to not corrupt `import-fresh` module (#7820 by @thorn0)

`v2.0.0`

`v1.19.1`

CLI

Fix `--stdin` regression in 1.19.0 (#6894 by @lydell)

// Prettier stable
$ echo "test" | prettier --stdin --parser babel
[error] regeneratorRuntime is not defined

// Prettier master
$ echo "test" | prettier --stdin --parser babel
test;

TypeScript

Fix formatting of union type as arrow function return type (#6896 by @thorn0)

// Input
export const getVehicleDescriptor = async (
  vehicleId: string,
): Promise<Collections.Parts.PrintedCircuitBoardAssembly['attributes'] | undefined> => {}

// Prettier stable
export const getVehicleDescriptor = async (
  vehicleId: string
): Promise<| Collections.Parts.PrintedCircuitBoardAssembly["attributes"]
| undefined> => {};

// Prettier master
export const getVehicleDescriptor = async (
  vehicleId: string
): Promise<
  Collections.Parts.PrintedCircuitBoardAssembly["attributes"] | undefined
> => {};

`v1.19.0`

`v1.18.2`

TypeScript: only add trailing commas in tuples for --trailing-comma=all (#6199 by @duailibe)

In Prettier 1.18 we added trailing commas in tuples when --trailing-comma=all, but it was also adding for --trailing-comma=es5.

`v1.18.1`

TypeScript: Add trailing comma in tsx, only for arrow function (#6190 by @sosukesuzuki)

Prettier inserts a trailing comma to single type parameter for arrow functions in tsx, since v 1.18. But, this feature inserts a trailing comma to type parameter for besides arrow functions too (e.g, function , interface). This change fix it.

// Input
interface Interface1<T> {
  one: "one";
}
function function1<T>() {
  return "one";
}

// Output (Prettier 1.18.0)
interface Interface1<T,> {
  one: "one";
}
function function1<T,>() {
  return "one";
}

// Output (Prettier 1.18.1)
interface Interface1<T> {
  one: "one";
}
function function1<T>() {
  return "one";
}

Config: Match dotfiles in config overrides (#6194 by @duailibe)

When using overrides in the config file, Prettier was not matching dotfiles (files that start with .). This was fixed in 1.18.1

`v1.18.0`

`v1.17.1`

Range: Fix ranged formatting not using the correct line width (#6050 by @mathieulj)

// Input
function f() {
  if (true) {
    call("this line is 79 chars", "long", "it should", "stay as single line");
  }
}

// Output (Prettier 1.17.0 run with --range-start 30 --range-end 110)
function f() {
  if (true) {
    call(
      "this line is 79 chars",
      "long",
      "it should",
      "stay as single line"
    );
  }
}

// Output (Prettier 1.17.0 run without range)
function f() {
  if (true) {
    call("this line is 79 chars", "long", "it should", "stay as single line");
  }
}

// Output (Prettier 1.17.1 with and without range)
function f() {
  if (true) {
    call("this line is 79 chars", "long", "it should", "stay as single line");
  }
}

JavaScript: Fix closure compiler typecasts ([#5947] by @jridgewell)

If a closing parenthesis follows after a typecast in an inner expression, the typecast would wrap everything to the that following parenthesis.

// Input
test(/** @&#8203;type {!Array} */(arrOrString).length);
test(/** @&#8203;type {!Array} */((arrOrString)).length + 1);

// Output (Prettier 1.17.0)
test(/** @&#8203;type {!Array} */ (arrOrString.length));
test(/** @&#8203;type {!Array} */ (arrOrString.length + 1));

// Output (Prettier 1.17.1)
test(/** @&#8203;type {!Array} */ (arrOrString).length);
test(/** @&#8203;type {!Array} */ (arrOrString).length + 1);

JavaScript: respect parenthesis around optional chaining before await (#6087 by @evilebottnawi)

// Input
async function myFunction() {
  var x = (await foo.bar.blah)?.hi;
}

// Output (Prettier 1.17.0)
async function myFunction() {
  var x = await foo.bar.blah?.hi;
}

// Output (Prettier 1.17.1)
async function myFunction() {
  var x = (await foo.bar.blah)?.hi;
}

Handlebars: Fix {{else}}{{#if}} into {{else if}} merging (#6080 by @dcyriller)

// Input
{{#if a}}
  a
{{else}}
  {{#if c}}
    c
  {{/if}}
  e
{{/if}}

// Output (Prettier 1.17.0)
{{#if a}}
  a
{{else if c}}
  c
e
{{/if}}

// Output (Prettier 1.17.1)
Code Sample
{{#if a}}
  a
{{else}}
  {{#if c}}
    c
  {{/if}}
  e
{{/if}}

JavaScript: Improved multiline closure compiler typecast comment detection (#6070 by @yangsu)

Previously, multiline closure compiler typecast comments with lines that
start with * weren't flagged correctly and the subsequent parenthesis were
stripped. Prettier 1.17.1 fixes this issue.

// Input
const style =/**
 * @&#8203;type {{
 *   width: number,
 * }}
*/({
  width,
});

// Output (Prettier 1.17.0)
const style =/**
 * @&#8203;type {{
 *   width: number,
 * }}
*/ {
  width,
};

// Output (Prettier 1.17.1)
const style =/**
 * @&#8203;type {{
 *   width: number,
 * }}
*/({
  width,
});

`v1.17.0`

`v1.16.4`

API: Fix prettier.getSupportInfo() reporting babel parser for older versions of Prettier. (#5826 by @azz)

In version 1.16.0 of Prettier, the babylon parser was renamed to babel. Unfortunately this lead to a minor breaking change: prettier.getSupportInfo('1.15.0') would report that it supported babel, not babylon, which breaks text-editor integrations. This has now been fixed.

`v1.16.3`

TypeScript: Revert "Update typescript-estree to new package name" (#5818 by @ikatyang)

There's an internal change introduced in Prettier 1.16.2,
which updated typescript-estree to its new package name,
but unfortunately it broke the output
so we reverted it as a temporary workaround for now.

// Input
export default {
  load<K, T>(k: K, t: T) {
    return {k, t};
  }
}

// Output (Prettier 1.16.2)
export default {
  load(k: K, t: T) {
    return { k, t };
  }
};

// Output (Prettier 1.16.3)
export default {
  load<K, T>(k: K, t: T) {
    return { k, t };
  }
};

`v1.16.2`