diff

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

<!-- prettier-ignore -->

// Input
class A {
  @decorator()
  get foo () {}
  
  @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 |   @decorator()
    |   ^^^^^^^^^^^^
  6 |   set foo (value) {}
  7 | }

// Prettier 2.8.7
class A {
  @decorator()
  get foo() {}

  @decorator()
  set foo(value) {}
}

diff

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

<!-- prettier-ignore -->

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

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

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

diff

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)

<!-- prettier-ignore -->

// Input
class Person {
  @(myDecoratorArray[0])
  greet() {}
}

// Prettier 2.8.4
class Person {
  @myDecoratorArray[0]
  greet() {}
}

// Prettier 2.8.5
class Person {
  @(myDecoratorArray[0])
  greet() {}
}

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

<!-- prettier-ignore -->

// 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).

<!-- prettier-ignore -->

<!-- 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} />;

diff

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

<!-- prettier-ignore -->

// 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.

<!-- prettier-ignore -->

{{! 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)

<!-- prettier-ignore -->

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

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

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

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

<!-- prettier-ignore -->

// 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;

diff

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

See Angular v15.1.0 release note for details.

<!-- prettier-ignore -->

// 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 />

diff

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

<!-- prettier-ignore -->

<!-- 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)

<!-- prettier-ignore -->

{{! 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.

<!-- prettier-ignore -->

{{! 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)

<!-- prettier-ignore -->

/* 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// Input
@variable: {
  field: something;
};

// Prettier 2.8.1
@variable: {
  field: something;
}; ;

// Prettier 2.8.2
@variable: {
  field: something;
};

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

<!-- prettier-ignore -->

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

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

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

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

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

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

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

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

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

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

<!-- prettier-ignore -->

// Input
@var: {
  preserveCase: 0;
};

// Prettier 2.8.1
@var: {
  preservecase: 0;
};

// Prettier 2.8.2
@var: {
  preserveCase: 0;
};

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

<!-- prettier-ignore -->

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

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

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

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

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

<!-- prettier-ignore -->

// 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.

<!-- prettier-ignore -->

// 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.

<!-- prettier-ignore -->

class Foo {
  accessor prop: number;
}

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

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

/* 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)

<!-- prettier-ignore -->

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

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

// Prettier 2.8.2
<Same as input>

diff

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

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

class Foo {
  accessor foo: number = 3;
}

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

# Input
"""
First line

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

# Prettier 2.7.0
"""
First line
Second Line
"""
type Person {
  name: String
}


# Prettier 2.7.1
"""
First line

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

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

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

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

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

diff

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

<!-- prettier-ignore -->

# Prettier 2.6.0
prettier --loglevel silent --find-config-path index.js
# Nothing printed

# Prettier 2.6.1
prettier --loglevel silent --help no-color
# .prettierrc

Make artifact friendly for webpack (#12485, #12511 by @fisker)

Fixes two problems when bundling our UMD files with webpack:

• A error "`....__exportStar` is not a function" throws when running the bundles.
• Some files cause warning about "Critical dependency: the request of a dependency is an expression".

Fix non-idempotent formatting of function calls with complex type arguments (#12508 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
const foo =
  doSomething<{ foo1: "foo1", foo2: "foo2", foo3: "foo3", foo4: "foo4", foo5: "foo5" }>();

// Prettier 2.6.0 (first)
const foo =
  doSomething<{
    foo1: "foo1";
    foo2: "foo2";
    foo3: "foo3";
    foo4: "foo4";
    foo5: "foo5";
  }>();

// Prettier 2.6.0 (second)
const foo = doSomething<{
  foo1: "foo1";
  foo2: "foo2";
  foo3: "foo3";
  foo4: "foo4";
  foo5: "foo5";
}>();

// Prettier 2.6.1
const foo = doSomething<{
  foo1: "foo1";
  foo2: "foo2";
  foo3: "foo3";
  foo4: "foo4";
  foo5: "foo5";
}>();

Fix minimist security issue (#12513 by @dependabot)

Details: Prototype Pollution

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

// 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.

<!-- prettier-ignore -->

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

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

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

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

// Input
@forward "library" as btn-*;

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

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

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

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

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

$ ls
1.js  1.unknown

# Prettier 2.3.1
$ prettier . -l
1.js
$ prettier ./ -l
[error] No supported files were found in the directory: "./".

# Prettier 2.3.2
$ prettier ./ -l
1.js

Fix handling of parenthesis with Flow's {Optional}IndexedAccess (#11051 by @gkz)

Add parens when required.

<!-- prettier-ignore -->

// Input
type A = (T & S)['bar'];
type B = (T | S)['bar'];
type C = (?T)['bar'];
type D = (typeof x)['bar'];
type E = (string => void)['bar'];

// Prettier 2.3.1
type A = T & S["bar"];
type B = T | S["bar"];
type C = ?T["bar"];
type D = typeof x["bar"];
type E = (string) => void["bar"];

// Prettier 2.3.2
type A = (T & S)["bar"];
type B = (T | S)["bar"];
type C = (?T)["bar"];
type D = (typeof x)["bar"];
type E = ((string) => void)["bar"];

Print override modifiers for parameter property (#11074 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
class D extends B {
  constructor(override foo: string) {
    super();
  }
}

// Prettier 2.3.1
class D extends B {
  constructor(foo: string) {
    super();
  }
}

// Prettier 2.3.2
class D extends B {
  constructor(override foo: string) {
    super();
  }
}

diff

Support TypeScript 4.3 (#10945 by @sosukesuzuki)

override modifiers in class elements

class Foo extends  {
  override method() {}
}

static index signatures ([key: KeyType]: ValueType) in classes

class Foo {
  static [key: string]: Bar;
}

get / set in type declarations

interface Foo {
  set foo(value);
  get foo(): string;
}

Preserve attributes order for element node (#10958 by @dcyriller)

<!-- prettier-ignore -->

{{!-- Input --}}
<MyComponent
  {{! this is a comment for arg 1}}
  @arg1="hello"
  {{on "click" this.modify}}
  @arg2="hello"
  {{! this is a comment for arg 3}}
  @arg3="hello"
  @arg4="hello"
  {{! this is a comment for arg 5}}
  @arg5="hello"
  ...arguments
/>
{{!-- Prettier stable --}}
<MyComponent
  @arg1="hello"
  @arg2="hello"
  @arg3="hello"
  @arg4="hello"
  @arg5="hello"
  ...arguments
  {{on "click" this.modify}}
  {{! this is a comment for arg 1}}
  {{! this is a comment for arg 3}}
  {{! this is a comment for arg 5}}
/>
{{!-- Prettier main --}}
<MyComponent
  {{! this is a comment for arg 1}}
  @arg1="hello"
  {{on "click" this.modify}}
  @arg2="hello"
  {{! this is a comment for arg 3}}
  @arg3="hello"
  @arg4="hello"
  {{! this is a comment for arg 5}}
  @arg5="hello"
  ...arguments
/>

Track cursor position properly when it’s at the end of the range to format (#10938 by @j-f1)

Previously, if the cursor was at the end of the range to format, it would simply be placed back at the end of the updated range. Now, it will be repositioned if Prettier decides to add additional code to the end of the range (such as a semicolon).

<!-- prettier-ignore -->

// Input (<|> represents the cursor)
const someVariable = myOtherVariable<|>
// range to format:  ^^^^^^^^^^^^^^^

// Prettier stable
const someVariable = myOtherVariable;<|>
// range to format:  ^^^^^^^^^^^^^^^

// Prettier main
const someVariable = myOtherVariable<|>;
// range to format:  ^^^^^^^^^^^^^^^

Break the LHS of type alias that has complex type parameters (#10901 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
type FieldLayoutWith<
  T extends string,
  S extends unknown = { width: string }
> = {
  type: T;
  code: string;
  size: S;
};

// Prettier stable
type FieldLayoutWith<T extends string, S extends unknown = { width: string }> =
  {
    type: T;
    code: string;
    size: S;
  };

// Prettier main
type FieldLayoutWith<
  T extends string,
  S extends unknown = { width: string }
> = {
  type: T;
  code: string;
  size: S;
};

Break the LHS of assignments that has complex type parameters (#10916 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
const map: Map<
  Function,
  Map<string | void, { value: UnloadedDescriptor }>
> = new Map();

// Prettier stable
const map: Map<Function, Map<string | void, { value: UnloadedDescriptor }>> =
  new Map();

// Prettier main
const map: Map<
  Function,
  Map<string | void, { value: UnloadedDescriptor }>
> = new Map();

Fix incorrectly wrapped arrow functions with return types (#10940 by @thorn0)

<!-- prettier-ignore -->

// Input
longfunctionWithCall12("bla", foo, (thing: string): complex<type<something>> => {
  code();
});

// Prettier stable
longfunctionWithCall12("bla", foo, (thing: string): complex<
  type<something>
> => {
  code();
});

// Prettier main
longfunctionWithCall12(
  "bla",
  foo,
  (thing: string): complex<type<something>> => {
    code();
  }
);

Avoid breaking call expressions after assignments with complex type arguments (#10949 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
const foo = call<{
  prop1: string;
  prop2: string;
  prop3: string;
}>();

// Prettier stable
const foo =
  call<{
    prop1: string;
    prop2: string;
    prop3: string;
  }>();

// Prettier main
const foo = call<{
  prop1: string;
  prop2: string;
  prop3: string;
}>();

Fix order of override modifiers (#10961 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
class Foo extends Bar {
  abstract override foo: string;
}

// Prettier stable
class Foo extends Bar {
  override abstract foo: string;
}

// Prettier main
class Foo extends Bar {
  abstract override foo: string;
}

diff

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

<!-- prettier-ignore -->

// 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");
  }
};

diff

🔗 Release Notes

diff

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

<!-- prettier-ignore -->

# Input
type Query {
  someQuery(id: ID!, someOtherData: String!): String! @deprecated @isAuthenticated
  versions: Versions!
}


# Prettier stable
type Query {
  someQuery(id: ID!, someOtherData: String!): String!
  @deprecated
  @isAuthenticated
  versions: Versions!
}

# Prettier master
type Query {
  someQuery(id: ID!, someOtherData: String!): String!
    @deprecated
    @isAuthenticated
  versions: Versions!
}

Fix line breaks for CSS in JS (#9136 by @sosukesuzuki)

<!-- prettier-ignore -->

// Input
styled.div`
  // prettier-ignore
  @media (aaaaaaaaaaaaa) {
	z-index: ${(props) => (props.isComplete ? '1' : '0')};
  }
`;
styled.div`
  ${props => getSize(props.$size.xs)}
  ${props => getSize(props.$size.sm, 'sm')}
  ${props => getSize(props.$size.md, 'md')}
`;

// Prettier stable
styled.div`
  // prettier-ignore
  @media (aaaaaaaaaaaaa) {
	z-index: ${(props) =>
    props.isComplete ? "1" : "0"};
  }
`;
styled.div`
  ${(props) => getSize(props.$size.xs)}
  ${(props) => getSize(props.$size.sm, "sm")}
  ${(props) =>
    getSize(props.$size.md, "md")}
`;

// Prettier master
styled.div`
  // prettier-ignore
  @media (aaaaaaaaaaaaa) {
        z-index: ${(props) => (props.isComplete ? "1" : "0")};
  }
`;
styled.div`
  ${(props) => getSize(props.$size.xs)}
  ${(props) => getSize(props.$size.sm, "sm")}
  ${(props) => getSize(props.$size.md, "md")}
`;

Fix comment printing in mapping and sequence (#9143, #9169 by @sosukesuzuki, @fisker, fix in yaml-unist-parser by @ikatyang)

<!-- prettier-ignore -->

# Input
- a
  # Should indent
- bb

---
- a: a
  b: b

  # Should print one empty line before
- another

# Prettier stable
- a
# Should indent
- bb

---
- a: a
  b: b


  # Should print one empty line before
- another

# Prettier master
- a
  # Should indent
- bb

---
- a: a
  b: b

  # Should print one empty line before
- another

diff

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

<!-- prettier-ignore -->

<!-- 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

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

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

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

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

<!-- prettier-ignore -->

<!-- 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" />

diff

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

<!-- prettier-ignore -->

// 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.

diff

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

diff

JavaScript

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

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

<!-- 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)

<!-- prettier-ignore -->

<!-- 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)

diff

2.0 regressions

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

<!-- prettier-ignore -->

// 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.

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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);

diff

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

diff

CLI

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

<!-- prettier-ignore -->

// 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)

<!-- prettier-ignore -->

// 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
> => {};

diff

🔗 Release Notes

diff

• 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.

diff

• 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.

  <!-- prettier-ignore -->

  // 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

diff

🔗 Release Notes

diff

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

  <!-- prettier-ignore -->

  // 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.

  <!-- prettier-ignore -->

  // Input
  test(/** @type {!Array} */(arrOrString).length);
  test(/** @type {!Array} */((arrOrString)).length + 1);
  
  // Output (Prettier 1.17.0)
  test(/** @type {!Array} */ (arrOrString.length));
  test(/** @type {!Array} */ (arrOrString.length + 1));
  
  // Output (Prettier 1.17.1)
  test(/** @type {!Array} */ (arrOrString).length);
  test(/** @type {!Array} */ (arrOrString).length + 1);
  

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

  <!-- prettier-ignore -->

  // 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)

  <!-- prettier-ignore -->

  // 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.

  <!-- prettier-ignore -->

  // Input
  const style =/**
   * @type {{
   *   width: number,
   * }}
  */({
    width,
  });
  
  // Output (Prettier 1.17.0)
  const style =/**
   * @type {{
   *   width: number,
   * }}
  */ {
    width,
  };
  
  // Output (Prettier 1.17.1)
  const style =/**
   * @type {{
   *   width: number,
   * }}
  */({
    width,
  });
  

diff

🔗 Release Notes

diff

• 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.

diff

• 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.

  <!-- prettier-ignore -->

  // 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 };
    }
  };
  

diff

• CLI: Fix CI detection to avoid unwanted TTY behavior (#5804 by @kachkaev)

  In Prettier 1.16.0 and 1.16.1, --list-different and --check logged every file in some CI environments, instead of just unformatted files. This unwanted behavior is now fixed.

• HTML: Do not format non-normal whitespace as normal whitespace (#5797 by @ikatyang)

  Previously, only non-breaking whitespaces (U+00A0) are marked as non-normal whitespace, which means other non-normal whitespaces such as non-breaking narrow whitespaces (U+202F) could be formatted as normal whitespaces, which breaks the output. We now follow the spec to exclude all non-ASCII whitespace from whitespace normalization.

  (· represents a non-breaking narrow whitespace)

  <!-- prettier-ignore -->

  <!-- Input -->
  Prix·:·32·€
  
  <!-- Output (Prettier 1.16.1) -->
  Prix : 32 €
  
  <!-- Output (Prettier 1.16.2) -->
  Prix·:·32·€
  

• JavaScript: Fix record type cast comment detection (#5793 by @yangsu)

  Previously, type cast comments with record types were ignored and prettier stripped the subsequent parens. Prettier 1.16.2 handles these cases correctly.

  <!-- prettier-ignore -->

  // Input
  const v = /** @type {{key: number}} */ (value);
  
  // Output (Prettier 1.16.1)
  const v = /** @type {{key: number}} */ value;
  
  // Output (Prettier 1.16.2)
  const v = /** @type {{key: number}} */ (value);
  

diff

• JavaScript: Do not format functions with arguments as react hooks (#5778 by @SimenB)

  The formatting added in Prettier 1.16 would format any function receiving an arrow function and an array literal to match React Hook's documentation. Prettier will now format this the same as before that change if the arrow function receives any arguments.

  <!-- prettier-ignore -->

  // Input
  ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce(
    (allColors, color) => {
      return allColors.concat(color);
    },
    []
  );
  
  // Output (Prettier 1.16.0)
  ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce((
    allColors,
    color
  ) => {
    return allColors.concat(color);
  }, []);
  
  // Output (Prettier 1.16.1)
  ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce(
    (allColors, color) => {
      return allColors.concat(color);
    },
    []
  );
  

• JavaScript: Add necessary parentheses for decorators (#5785 by @ikatyang)

  Parentheses for decorators with nested call expressions are optional for legacy decorators but they're required for decorators in the current proposal.

  <!-- prettier-ignore -->

  // Input
  class X {
    @(computed().volatile())
    prop
  }
  
  // Output (Prettier 1.16.0)
  class X {
    @computed().volatile()
    prop
  }
  
  // Output (Prettier 1.16.1)
  class X {
    @(computed().volatile())
    prop
  }
  

• TypeScript: Stable parentheses for function type in the return type of arrow function (#5790 by @ikatyang)

  There's a regression introduced in 1.16 that parentheses for function type in the return type of arrow function were kept adding/removing. Their parentheses are always printed now.

  <!-- prettier-ignore -->

  // Input
  const foo = (): (() => void) => (): void => null;
  const bar = (): () => void => (): void => null;
  
  // First Output (Prettier 1.16.0)
  const foo = (): () => void => (): void => null;
  const bar = (): (() => void) => (): void => null;
  
  // Second Output (Prettier 1.16.0)
  const foo = (): (() => void) => (): void => null;
  const bar = (): () => void => (): void => null;
  
  // Output (Prettier 1.16.1)
  const foo = (): (() => void) => (): void => null;
  const bar = (): (() => void) => (): void => null;
  

• MDX: Correctly recognize inline JSX (#5783 by @ikatyang)

  Previously, some inline JSXs are wrongly recognized as block HTML/JSX, which causes unexpected behaviors. This issue is now fixed.

  <!-- prettier-ignore -->

  <!-- Input -->
  _foo <InlineJSX /> bar_
  
  <!-- Output (Prettier 1.16.0) -->
  _foo
  
  <InlineJSX /> bar_
  
  <!-- Output (Prettier 1.16.1) -->
  _foo <InlineJSX /> bar_
  

diff

🔗 Release Notes

diff

• JavaScript: support htm (#5565)
• JavaScript: support logical assignment operator (#5489)
• JavaScript: do not add quotes for interpolation-only attributes in html templates (#5544)
• JavaScript: add missing parenthesis for binary in optional member (#5543)
• JavaScript: fix a parser regression (#5530)
• JavaScript: improve union types with leading comments (#5575)
• TypeScript: support BigInt (#5546, #5577)
• TypeScript: inline method decorators should stay inlined (#5444)
• TypeScript: do not change module into namespace and break/hug their body correctly (#5551)
• TypeScript: do not add invalid semicolon for construct in interface with // prettier-ignore (#5469)
• HTML: do not touch comments (#5525)
• HTML: preserve bogus comments <! ... >/<? ... > (#5565)
• HTML: support IE conditional start/end comment (#5470)
• HTML: do not add extra indentation for js template in <script> (#5527)
• HTML: leading spaces for the first interpolation in <textarea> are sensitive (#5468)
• HTML: preserve content for element in <pre> correctly (#5473)
• HTML: correct column for error code frame (#5553)
• Angular: support interpolation in attributes (#5573)
• Angular: do not print colon for then and else in *ngIf (#5542)
• Angular/Vue: do not normalize tag/attribute names (#5526, #5549)
• Vue: preserve custom block (#5458)
• Vue: remove unnecessary semicolon and preserve necessary semicolon for single expression in event bindings (#5519)
• Vue: group slot-scope correctly (#5563)
• Markdown: do not trim content in inline-math (#5485)
• Markdown: add more category to CJK regex (#5480)
• SCSS: update parser for performance improvements (#5481)
• YAML: preserve the first document head end marker --- (#5502)
• API: resolve ignored field correctly in .getFileInfo() with absolute filePath (#5570)
• API/CLI: fix a bug that caches for .js config files did not respect .clearConfigCache() (#5558)
• API/CLI: ignore unset in .editorconfig (#5550)
• CLI: report status code 0 for --list-different + --write (#5512)
• Standalone: fix a regression for browser compatibility (#5560)

diff

• CLI: allow flag overriding (#5390)
• JavaScript: do not apply test call formatting to arrow function without body (#5366)
• JavaScript: do not duplicate comments in styled-components (#5416)
• JavaScript: do not indent comments behind variable declarations (#5434)
• JavaScript: inline property decorator should stay inline (#5364, #5423)
• JavaScript: treat createSelector as function composition (#5430)
• Flow: do not move flow comment for function argument to its body (#5435)
• Flow: force-break interface body to be consistent with TypeScript interface (#5432)
• Flow/TypeScript: remove extra indentation for extends (#5432)
• TypeScript: distinguish module and namespace correctly (#5432)
• HTML: handle CRLF correctly (#5393)
• HTML: handle <pre> with interpolation (#5400)
• HTML: preserve content for <template> with unknown lang (#5388)
• HTML: preserve incomplete IE conditional comments (#5429)
• HTML: preserve unterminated IE conditional comments (#5424)
• HTML: treat capital element as custom element (#5395)
• Angular: add missing parens for pipe in ternary (#5397)
• Angular: correctly print unary expression with operator + (#5405)
• Angular: correctly handle parens (#5387)
• Angular/Vue: whitespaces between interpolation and text are sensitive (#5396)
• Vue: do not add invalid semicolon for v-on attribute value (#5418)
• SCSS: do not crash on grid value (#5394)
• Markdown: handle CRLF correctly (#5414)
• Markdown: identify CJK correctly (#5402)
• MDX: treat JSX code block same as in Markdown (#5391)