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SCSS: Prevent trailing comma in `if()` function (#18471 by @kovsu)

// Input
$value: if(sass(false): 1; else: -1);

// Prettier 3.8.2
$value: if(
  sass(false): 1; else: -1,
);

// Prettier 3.8.3
$value: if(sass(false): 1; else: -1);

`v3.8.2`

Angular: Support Angular v21.2 (#18722, #19034 by @fisker)

Exhaustive typechecking with @default never;

<!-- Input -->
@&#8203;switch (foo) {
  @&#8203;case (1) {}
  @&#8203;default never;
}

<!-- Prettier 3.8.1 -->
SyntaxError: Incomplete block "default never". If you meant to write the @&#8203; character, you should use the "&#&#8203;64;" HTML entity instead. (3:3)

<!-- Prettier 3.8.2 -->
@&#8203;switch (foo) {
  @&#8203;case (1) {}
  @&#8203;default never;
}

arrow function and instanceof expressions.

<!-- Input -->
@&#8203;let fn = (a) =>        a?    1:2;

{{ fn ( a         instanceof b)}}

<!-- Prettier 3.8.1 -->
@&#8203;let fn = (a) =>        a?    1:2;

{{ fn ( a         instanceof b)}}

<!-- Prettier 3.8.2 -->
@&#8203;let fn = (a) => (a ? 1 : 2);

{{ fn(a instanceof b) }}

`v3.8.1`

Include available `printers` in plugin type declarations (#18706 by @porada)

// Input
import * as prettierPluginEstree from "prettier/plugins/estree";

// Prettier 3.8.0
// Property 'printers' does not exist on type 'typeof import("prettier/plugins/estree")'. ts(2339)
prettierPluginEstree.printers.estree; //=> any

// Prettier 3.8.1
prettierPluginEstree.printers.estree; //=> Printer
prettierPluginEstree.printers["estree-json"]; //=> Printer

`v3.8.0`

`v3.7.4`

LWC: Avoid quote around interpolations (#18383 by @kovsu)

<!-- Input -->
<div foo={bar}>   </div>

<!-- Prettier 3.7.3 (--embedded-language-formatting off) -->
<div foo="{bar}"></div>

<!-- Prettier 3.7.4 (--embedded-language-formatting off) -->
<div foo={bar}></div>

TypeScript: Fix comment inside union type gets duplicated (#18393 by @fisker)

// Input
type Foo = (/** comment */ a | b) | c;

// Prettier 3.7.3
type Foo = /** comment */ (/** comment */ a | b) | c;

// Prettier 3.7.4
type Foo = /** comment */ (a | b) | c;

TypeScript: Fix unstable comment print in union type comments (#18395 by @fisker)

// Input
type X = (A | B) & (
  // comment
  A | B
);

// Prettier 3.7.3 (first format)
type X = (A | B) &
  (// comment
  A | B);

// Prettier 3.7.3 (second format)
type X = (
  | A
  | B // comment
) &
  (A | B);

// Prettier 3.7.4
type X = (A | B) &
  // comment
  (A | B);

`v3.7.3`

API: Fix `prettier.getFileInfo()` change that breaks VSCode extension (#18375 by @fisker)

An internal refactor accidentally broke the VSCode extension plugin loading.

`v3.7.2`

JavaScript: Fix string print when switching quotes (#18351 by @fisker)

// Input
console.log("A descriptor\\'s .kind must be \"method\" or \"field\".")

// Prettier 3.7.1
console.log('A descriptor\\'s .kind must be "method" or "field".');

// Prettier 3.7.2
console.log('A descriptor\\\'s .kind must be "method" or "field".');

JavaScript: Preserve quote for embedded HTML attribute values (#18352 by @kovsu)

// Input
const html = /* HTML */ ` <div class="${styles.banner}"></div> `;

// Prettier 3.7.1
const html = /* HTML */ ` <div class=${styles.banner}></div> `;

// Prettier 3.7.2
const html = /* HTML */ ` <div class="${styles.banner}"></div> `;

TypeScript: Fix comment in empty type literal (#18364 by @fisker)

// Input
export type XXX = {
  // tbd
};

// Prettier 3.7.1
export type XXX = { // tbd };

// Prettier 3.7.2
export type XXX = {
  // tbd
};

`v3.7.1`

API: Fix performance regression in doc printer (#18342 by @fisker)

Prettier 3.7.0 can be very slow when formatting big files, the regression has been fixed.

`v3.7.0`

`v3.6.2`

Markdown: Add missing blank line around code block (#17675 by @fisker)

<!-- Input -->
1. Some text, and code block below, with newline after code block

   ```yaml
   ---
   foo: bar
   ```

   1. Another
   2. List

<!-- Prettier 3.6.1 -->
1. Some text, and code block below, with newline after code block

   ```yaml
   ---
   foo: bar
   ```
   1. Another
   2. List

<!-- Prettier 3.6.2 -->
1. Some text, and code block below, with newline after code block

   ```yaml
   ---
   foo: bar
   ```

   1. Another
   2. List

`v3.6.1`

TypeScript: Allow const without initializer (#17650, #17654 by @fisker)

// Input
export const version: string;

// Prettier 3.6.0 (--parser=babel-ts)
SyntaxError: Unexpected token (1:21)
> 1 | export const version: string;
    |                     ^

// Prettier 3.6.0 (--parser=oxc-ts)
SyntaxError: Missing initializer in const declaration (1:14)
> 1 | export const version: string;
    |              ^^^^^^^^^^^^^^^

// Prettier 3.6.1
export const version: string;

Miscellaneous: Avoid closing files multiple times (#17665 by @43081j)

When reading a file to infer the interpreter from a shebang, we use the
n-readlines library to read the first line in order to get the shebang.

This library closes files when it reaches EOF, and we later try close the same
files again. We now close files only if n-readlines did not already close
them.

`v3.6.0`

`v3.5.3`

Flow: Fix missing parentheses in `ConditionalTypeAnnotation` (#17196 by @fisker)

// Input
type T<U> = 'a' | ('b' extends U ? 'c' : empty);
type T<U> = 'a' & ('b' extends U ? 'c' : empty);

// Prettier 3.5.2
type T<U> = "a" | "b" extends U ? "c" : empty;
type T<U> = "a" & "b" extends U ? "c" : empty;

// Prettier 3.5.3
type T<U> = "a" | ("b" extends U ? "c" : empty);
type T<U> = "a" & ("b" extends U ? "c" : empty);

`v3.5.2`

Remove `module-sync` condition (#17156 by @fisker)

In Prettier 3.5.0, we added module-sync condition to package.json, so that require("prettier") can use ESM version, but turns out it doesn't work if CommonJS and ESM plugins both imports builtin plugins. To solve this problem, we decide simply remove the module-sync condition, so require("prettier") will still use the CommonJS version, we'll revisit until require(ESM) feature is more stable.

`v3.5.1`

Fix CLI crash when cache for old version exists (#17100 by @sosukesuzuki)

Prettier 3.5 uses a different cache format than previous versions, Prettier 3.5.0 crashes when reading existing cache file, Prettier 3.5.1 fixed the problem.

Support dockercompose and github-actions-workflow in VSCode (#17101 by @remcohaszing)

Prettier now supports the dockercompose and github-actions-workflow languages in Visual Studio Code.

`v3.5.0`

`v3.4.2`

Treat U+30A0 & U+30FB in Katakana Block as CJK (#16796 by @tats-u)

Prettier doesn't treat U+30A0 & U+30FB as Japanese. U+30FB is commonly used in Japanese to represent the delimitation of first and last names of non-Japanese people or “and”. The following “C言語・C++・Go・Rust” means “C language & C++ & Go & Rust” in Japanese.

<!-- Input (--prose-wrap=never) -->

C言
語
・
C++
・
Go
・
Rust

<!-- Prettier 3.4.1 -->
C言語・ C++ ・ Go ・ Rust

<!-- Prettier 3.4.2 -->
C言語・C++・Go・Rust

U+30A0 can be used as the replacement of the - in non-Japanese names (e.g. “Saint-Saëns” (Charles Camille Saint-Saëns) can be represented as “サン゠サーンス” in Japanese), but substituted by ASCII hyphen (U+002D) or U+FF1D (full width hyphen) in many cases (e.g. “サン=サーンス” or “サン＝サーンス”).

Fix comments print on class methods with decorators (#16891 by @fisker)

// Input
class A {
  @&#8203;decorator
  /** 
   * The method description
   *
  */
  async method(foo: Foo, bar: Bar) {
    console.log(foo);
  }
}

// Prettier 3.4.1
class A {
  @&#8203;decorator
  async /**
   * The method description
   *
   */
  method(foo: Foo, bar: Bar) {
    console.log(foo);
  }
}

// Prettier 3.4.2
class A {
  @&#8203;decorator
  /**
   * The method description
   *
   */
  async method(foo: Foo, bar: Bar) {
    console.log(foo);
  }
}

Fix non-idempotent formatting (#16899 by @seiyab)

This bug fix is not language-specific. You may see similar change in any languages. This fixes regression in 3.4.0 so change caused by it should yield same formatting as 3.3.3.

// Input
<div>
  foo
  <span>longlonglonglonglonglonglonglonglonglonglonglonglonglonglongl foo</span>
  , abc
</div>;

// Prettier 3.4.1 (first)
<div>
  foo
  <span>
    longlonglonglonglonglonglonglonglonglonglonglonglonglonglongl foo
  </span>, abc
</div>;

// Prettier 3.4.1 (second)
<div>
  foo
  <span>longlonglonglonglonglonglonglonglonglonglonglonglonglonglongl foo</span>
  , abc
</div>;

// Prettier 3.4.2
<div>
  foo
  <span>longlonglonglonglonglonglonglonglonglonglonglonglonglonglongl foo</span>
  , abc
</div>;

`v3.4.1`

Remove unnecessary parentheses around assignment in `v-on` (#16887 by @fisker)

<!-- Input -->
<template>
  <button @&#8203;click="foo += 2">Click</button>
</template>

<!-- Prettier 3.4.0 -->
<template>
  <button @&#8203;click="(foo += 2)">Click</button>
</template>

<!-- Prettier 3.4.1 -->
<template>
  <button @&#8203;click="foo += 2">Click</button>
</template>

`v3.4.0`

`v3.3.3`

Add parentheses for nullish coalescing in ternary (#16391 by @cdignam-segment)

This change adds clarity to operator precedence.

// Input
foo ? bar ?? foo : baz;
foo ?? bar ? a : b;
a ? b : foo ?? bar;

// Prettier 3.3.2
foo ? bar ?? foo : baz;
foo ?? bar ? a : b;
a ? b : foo ?? bar;

// Prettier 3.3.3
foo ? (bar ?? foo) : baz;
(foo ?? bar) ? a : b;
a ? b : (foo ?? bar);

Add parentheses for decorator expressions (#16458 by @y-schneider)

Prevent parentheses around member expressions or tagged template literals from being removed to follow the stricter parsing rules of TypeScript 5.5.

// Input
@&#8203;(foo`tagged template`)
class X {}

// Prettier 3.3.2
@&#8203;foo`tagged template`
class X {}

// Prettier 3.3.3
@&#8203;(foo`tagged template`)
class X {}

Support `@let` declaration syntax (#16474 by @sosukesuzuki)

Adds support for Angular v18 @let declaration syntax.

Please see the following code example. The @let declaration allows you to define local variables within the template:

@&#8203;let name = 'Frodo';

<h1>Dashboard for {{name}}</h1>
Hello, {{name}}

For more details, please refer to the excellent blog post by the Angular Team: Introducing @let in Angular.

We also appreciate the Angular Team for kindly answering our questions to implement this feature.

`v3.3.2`

Fix handlebars path expressions starts with `@` (#16358 by @Princeyadav05)

{{! Input }}
<div>{{@&#8203;x.y.z}}</div>

{{! Prettier 3.3.1 }}
<div>{{@&#8203;x}}</div>

{{! Prettier 3.3.2 }}
<div>{{@&#8203;x.y.z}}</div>

`v3.3.1`

Preserve empty lines in front matter (#16347 by @fisker)

<!-- Input -->
---
foo:
  - bar1

  - bar2

  - bar3
---
Markdown

<!-- Prettier 3.3.0 -->

---
foo:
  - bar1
  - bar2
  - bar3
---

Markdown

<!-- Prettier 3.3.1 -->
---
foo:
  - bar1

  - bar2

  - bar3
---

Markdown

Preserve explicit language in front matter (#16348 by @fisker)

<!-- Input -->
---yaml
title: Hello
slug: home
---

<!-- Prettier 3.3.0 -->
---
title: Hello
slug: home
---

<!-- Prettier 3.3.1 -->
---yaml
title: Hello
slug: home
---

Avoid line breaks in import attributes (#16349 by @fisker)

// Input
import something from "./some-very-very-very-very-very-very-very-very-long-path.json" with { type: "json" };

// Prettier 3.3.0
import something from "./some-very-very-very-very-very-very-very-very-long-path.json" with { type:
  "json" };

// Prettier 3.3.1
import something from "./some-very-very-very-very-very-very-very-very-long-path.json" with { type: "json" };

`v3.3.0`