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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`

`v3.2.5`

Support Angular inline styles as single template literal (#15968 by @sosukesuzuki)

Angular v17 supports single string inline styles.

// Input
@&#8203;Component({
  template: `<div>...</div>`,
  styles: `h1 { color: blue; }`,
})
export class AppComponent {}

// Prettier 3.2.4
@&#8203;Component({
  template: `<div>...</div>`,
  styles: `h1 { color: blue; }`,
})
export class AppComponent {}

// Prettier 3.2.5
@&#8203;Component({
  template: `<div>...</div>`,
  styles: `
    h1 {
      color: blue;
    }
  `,
})
export class AppComponent {}

Unexpected embedded formatting for Angular template (#15969 by @JounQin)

Computed template should not be considered as Angular component template

// Input
const template = "foobar";

@&#8203;Component({
  [template]: `<h1>{{       hello }}</h1>`,
})
export class AppComponent {}

// Prettier 3.2.4
const template = "foobar";

@&#8203;Component({
  [template]: `<h1>{{ hello }}</h1>`,
})
export class AppComponent {}

// Prettier 3.2.5
const template = "foobar";

@&#8203;Component({
  [template]: `<h1>{{       hello }}</h1>`,
})
export class AppComponent {}

Use `"json"` parser for `tsconfig.json` by default (#16012 by @sosukesuzuki)

In v3.2.0, we introduced "jsonc" parser which adds trailing comma by default.

When adding a new parser we also define how it will be used based on the linguist-languages data.

tsconfig.json is a special file used by TypeScript, it uses .json file extension, but it actually uses the JSON with Comments syntax. However, we found that there are many third-party tools not recognize it correctly because of the confusing .json file extension.

We decide to treat it as a JSON file for now to avoid the extra configuration step.

To keep using the "jsonc" parser for your tsconfig.json files, add the following to your .prettierrc file

{
  "overrides": [
    {
      "files": ["tsconfig.json", "jsconfig.json"],
      "options": {
        "parser": "jsonc"
      }
    }
  ]
}

`v3.2.4`

prettier --file-info tsconfig.json
{ "ignored": false, "inferredParser": "jsonc" }

`v3.2.3`

Throw errors for invalid code (#15881 by @fisker, @Josh-Cena, @auvred)

// Input
1++;

// Prettier 3.2.2
1++;

// Prettier 3.2.3
SyntaxError: Invalid left-hand side expression in unary operation (1:1)
> 1 | 1++;
    | ^

// Input
try {} catch (error = 1){}

// Prettier 3.2.2
try {
} catch (error) {}

// Prettier 3.2.3
SyntaxError: Catch clause variable cannot have an initializer. (1:23)
> 1 | try {} catch (error = 1){}
    |                       ^

Fix parser inference (#15927 by @fisker)

// Prettier 3.2.2
prettier --file-info tsconfig.json
{ "ignored": false, "inferredParser": "json" }

// Prettier 3.2.3
prettier --file-info tsconfig.json
{ "ignored": false, "inferredParser": "jsonc" }

`v3.2.2`

Fix crash when parsing template literal CSS in a JSX style tag using a spread attribute (#15896 by @eelco)

For example this code would crash before:

<style {...spread}>{`.{}`}</style>

Fix formatting error on optional call expression and member chain (#15920 by @sosukesuzuki)

// Input
a(() => {}, c?.d());

// Prettier 3.2.1
TypeError: Cannot read properties of undefined (reading 'type')

// Prettier 3.2.2
a(() => {}, c?.d());

`v3.2.1`

Fix formatting error on member chain (#15915 by @sosukesuzuki)

// Input
test().test2().test2(thing?.something);

// Prettier 3.2.0
TypeError: Cannot read properties of undefined (reading 'type')

// Prettier 3.2.1
test().test2().test2(thing?.something);

`v3.2.0`

`v3.1.1`

Fix config file search (#15363 by @fisker)

Previously, we start search for config files from the filePath as a directory, if it happened to be a directory and contains config file, it will be used by mistake.

├─ .prettierrc
└─ test.js         (A directory)
  └─ .prettierrc

// Prettier 3.1.0
await prettier.resolveConfigFile(new URL("./test.js", import.meta.url));
// <CWD>/test.js/.prettierrc

// Prettier 3.1.1
await prettier.resolveConfigFile(new URL("./test.js", import.meta.url));
// <CWD>/.prettierrc

Skip explicitly passed symbolic links with `--no-error-on-unmatched-pattern` (#15533 by @sanmai-NL)

Since Prettier v3, we stopped following symbolic links, however in some use cases, the symbolic link patterns can't be filtered out, and there is no way to prevent Prettier from throwing errors.

In Prettier 3.1.1, you can use --no-error-on-unmatched-pattern to simply skip symbolic links.

Consistently use tabs in ternaries when `useTabs` is `true` (#15662 by @auvred)

// Input
aaaaaaaaaaaaaaa
	? bbbbbbbbbbbbbbbbbb
	: ccccccccccccccc
	  ? ddddddddddddddd
	  : eeeeeeeeeeeeeee
	    ? fffffffffffffff
	    : gggggggggggggggg;

// Prettier 3.1.0
aaaaaaaaaaaaaaa
	? bbbbbbbbbbbbbbbbbb
	: ccccccccccccccc
	  ? ddddddddddddddd
	  : eeeeeeeeeeeeeee
	    ? fffffffffffffff
	    : gggggggggggggggg;

// Prettier 3.1.1
aaaaaaaaaaaaaaa
	? bbbbbbbbbbbbbbbbbb
	: ccccccccccccccc
		? ddddddddddddddd
		: eeeeeeeeeeeeeee
			? fffffffffffffff
			: gggggggggggggggg;

Improve config file search (#15663 by @fisker)

The Prettier config file search performance has been improved by more effective cache strategy.

Fix unstable and ugly formatting for comments in destructuring patterns (#15708 by @sosukesuzuki)

// Input
const {
  foo,
  // bar
  // baz
}: Foo = expr;

// Prettier 3.1.0
const {
  foo1,
} // bar
// baz
: Foo = expr;

// Prettier 3.1.0 second output
const {
  foo1, // bar
} // baz
: Foo = expr;

// Prettier 3.1.1
const {
  foo1,
  // bar
  // baz
}: Foo = expr;

Support "Import Attributes" (#15718 by @fisker)

TypeScript 5.3 supports the latest updates to the import attributes proposal.

import something from "./something.json" with { type: "json" };

Fix false claim in docs that cursorOffset is incompatible with rangeStart/rangeEnd (#15750 by @ExplodingCabbage)

The cursorOffset option has in fact been compatible with rangeStart/rangeEnd for over 5 years, thanks to work by @ds300. However, Prettier's documentation (including the CLI --help text) continued to claim otherwise, falsely. The documentation is now fixed.

Keep curly braces and `from` keyword in empty `import` statements (#15756 by @fisker)

// Input
import { } from 'foo';
import { /* comment */ } from 'bar';

// Prettier 3.1.0
import {} from "foo";
import /* comment */ "bar";

// Prettier 3.1.1
import {} from "foo";
import {} from /* comment */ "bar";

Keep empty import attributes and assertions (#15757 by @fisker)

// Input
import foo from "foo" with {};
import bar from "bar" assert {};

// Prettier 3.1.0
import foo from "foo";
import bar from "bar";

// Prettier 3.1.1
import foo from "foo" with {};
import bar from "bar" assert {};

`v3.1.0`

`v3.0.3`

Add `preferUnplugged: true` to `package.json` (#15169 by @fisker and @so1ve)

Prettier v3 uses dynamic imports, user will need to unplug Prettier when Yarn's PnP mode is enabled, add preferUnplugged: true to package.json, so Yarn will install Prettier as unplug by default.

Support shared config that forbids `require()` (#15233 by @fisker)

If an external shared config package is used, and the package exports don't have require or default export.

In Prettier 3.0.2 Prettier fails when attempt to require() the package, and throws an error.

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in <packageName>/package.json

Allow argument of `require()` to break (#15256 by @fisker)

// Input
const plugin = require(
  global.STANDALONE
    ? path.join(__dirname, "../standalone.js")
    : path.join(__dirname, "..")
);

// Prettier 3.0.2
const plugin = require(global.STANDALONE
  ? path.join(__dirname, "../standalone.js")
  : path.join(__dirname, ".."));

// Prettier 3.0.3
const plugin = require(
  global.STANDALONE
    ? path.join(__dirname, "../standalone.js")
    : path.join(__dirname, "..")
);

Do not print trailing commas in arrow function type parameter lists in `ts` code blocks (#15286 by @sosukesuzuki)

<!-- Input -->
```ts
const foo = <T>() => {}
```

<!-- Prettier 3.0.2 -->
```ts
const foo = <T,>() => {}
```

<!-- Prettier 3.0.3 -->
```ts
const foo = <T>() => {}
```

Support TypeScript 5.2 `using` / `await using` declaration (#15321 by @sosukesuzuki)

Support for the upcoming Explicit Resource Management feature in ECMAScript. using / await using declaration

{
   using foo = new Foo();
   await using bar = new Bar();
}

`v3.0.2`

Break after `=` of assignment if RHS is poorly breakable AwaitExpression or YieldExpression (#15204 by @seiyab)

// Input
const { section, rubric, authors, tags } = await utils.upsertCommonData(mainData);

// Prettier 3.0.1
const { section, rubric, authors, tags } = await utils.upsertCommonData(
  mainData,
);

// Prettier 3.0.2
const { section, rubric, authors, tags } =
  await utils.upsertCommonData(mainData);

Do not add trailing comma for grouped scss comments (#15217 by @auvred)

/* Input */
$foo: (
	'property': (),
	// comment 1
	// comment 2
)

/* Prettier 3.0.1 */
$foo: (
  "property": (),
  // comment 1
  // comment 2,
);

/* Prettier 3.0.2 */
$foo: (
  "property": (),
  // comment 1
  // comment 2
);

Print `declare` and `export` keywords for nested namespace (#15249 by @sosukesuzuki)

// Input
declare namespace abc1.def {}
export namespace abc2.def {}

// Prettier 3.0.1
namespace abc1.def {}
namespace abc2.def {}

// Prettier 3.0.2
declare namespace abc1.def {}
export namespace abc2.def {}

`v3.0.1`

https://blog.vuejs.org/posts/vue-3-3#generic-components

Fix cursor positioning for a special case (#14812 by @fisker)

// <|> is the cursor position

/* Input */
// All messages are represented in JSON.
// So, the prettier.py controls a subprocess which spawns "node {this_file}".
import {<|>  } from "fs"

/* Prettier 3.0.0 */
// All messages are represented in JSON.
// So, the prettier.py <|>controls a subprocess which spawns "node {this_file}".
import {} from "fs"

/* Prettier 3.0.1 */
// All messages are represented in JSON.
// So, the prettier.py controls a subprocess which spawns "node {this_file}".
import {<|>} from "fs"

Fix plugins/estree.d.ts to make it a module (#15018 by @kingyue737)

Add export {} in plugins/estree.d.ts to fix the "File is not a module" error

Add parenthesis around leading multiline comment in return statement (#15037 by @auvred)

// Input
function fn() {
  return (
    /**
     * @&#8203;type {...}
     */ expression
  )
}

// Prettier 3.0.0
function fn() {
  return /**
   * @&#8203;type {...}
   */ expression;
}

// Prettier 3.0.1
function fn() {
  return (
    /**
     * @&#8203;type {...}
     */ expression
  );
}

Add support for Vue "Generic Components" (#15066 by @auvred)

<!-- Input -->
<script setup lang="ts" generic="T extends Type1 & Type2 & (Type3 | Type4), U extends string | number | boolean"></script>

<!-- Prettier 3.0.0 -->
<script
  setup
  lang="ts"
  generic="T extends Type1 & Type2 & (Type3 | Type4), U extends string | number | boolean"
></script>

<!-- Prettier 3.0.1 -->
<script
  setup
  lang="ts"
  generic="
    T extends Type1 & Type2 & (Type3 | Type4),
    U extends string | number | boolean
  "
></script>

Fix comments print in `IfStatement` (#15076 by @fisker)

function a(b) {
  if (b) return 1; // comment
  else return 2;
}

/* Prettier 3.0.0 */
Error: Comment "comment" was not printed. Please report this error!

/* Prettier 3.0.1 */
function a(b) {
  if (b) return 1; // comment
  else return 2;
}

Add missing type definition for `printer.preprocess` (#15123 by @so1ve)

export interface Printer<T = any> {
  // ...
+ preprocess?:
+   | ((ast: T, options: ParserOptions<T>) => T | Promise<T>)
+   | undefined;
}

Add missing `getVisitorKeys` method type definition for `Printer` (#15125 by @auvred)

const printer: Printer = {
  print: () => [],
  getVisitorKeys(node, nonTraversableKeys) {
    return ["body"];
  },
};

Add typing to support `readonly` array properties of AST Node (#15127 by @auvred)

// Input
interface TestNode {
  readonlyArray: readonly string[];
}

declare const path: AstPath<TestNode>;

path.map(() => "", "readonlyArray");

// Prettier 3.0.0
interface TestNode {
  readonlyArray: readonly string[];
}

declare const path: AstPath<TestNode>;

path.map(() => "", "readonlyArray");
//                  ^ Argument of type '"readonlyArray"' is not assignable to parameter of type '"regularArray"'. ts(2345)

// Prettier 3.0.1
interface TestNode {
  readonlyArray: readonly string[];
}

declare const path: AstPath<TestNode>;

path.map(() => "", "readonlyArray");

Add space before unary minus followed by a function call (#15129 by @pamelalozano)

// Input
div {
  margin: - func();
}

// Prettier 3.0.0
div {
  margin: -func();
}

// Prettier 3.0.1
div {
  margin: - func();
}

`v3.0.0`