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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 [email protected] 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`