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`v9.16.0`

Features

8f70eb1 feat: Add ignoreComputedKeys option in sort-keys rule (#19162) (Milos Djermanovic)

Documentation

9eefc8f docs: fix typos in use-isnan (#19190) (루밀LuMir)
0c8cea8 docs: switch the order of words in no-unreachable (#19189) (루밀LuMir)
0c19417 docs: add missing backtick to no-async-promise-executor (#19188) (루밀LuMir)
8df9276 docs: add backtick in -0 in description of no-compare-neg-zero (#19186) (루밀LuMir)
7e16e3f docs: fix caseSensitive option's title of sort-keys (#19183) (Tanuj Kanti)
0c6b842 docs: fix typos in migration-guide.md (#19180) (루밀LuMir)
353266e docs: fix a typo in debug.md (#19179) (루밀LuMir)
5ff318a docs: delete unnecessary horizontal rule(---) in nodejs-api (#19175) (루밀LuMir)
576bcc5 docs: mark more rules as handled by TypeScript (#19164) (Tanuj Kanti)
742d054 docs: note that no-restricted-syntax can be used with any language (#19148) (Milos Djermanovic)

Chores

feb703b chore: upgrade to @eslint/[email protected] (#19195) (Francesco Trotta)
df9bf95 chore: package.json update for @eslint/js release (Jenkins)
f831893 chore: add type for ignoreComputedKeys option of sort-keys (#19184) (Tanuj Kanti)
3afb8a1 chore: update dependency @eslint/json to ^0.8.0 (#19177) (Milos Djermanovic)
1f77c53 chore: add repository.directory property to package.json (#19165) (루밀LuMir)
d460594 chore: update dependency @arethetypeswrong/cli to ^0.17.0 (#19147) (renovate[bot])
45cd4ea refactor: update default options in rules (#19136) (Milos Djermanovic)

Features

5a6a053 feat: update to jiti v2 (#18954) (Arya Emami)
17a07fb feat: Hooks for test cases (RuleTester) (#18771) (Anna Bocharova)
2ff0e51 feat: Implement alternate config lookup (#18742) (Nicholas C. Zakas)
2d17453 feat: Implement modified cyclomatic complexity (#18896) (Dmitry Pashkevich)

Bug Fixes

ea380ca fix: Upgrade retry to avoid EMFILE errors (#18986) (Nicholas C. Zakas)
fdd6319 fix: Issues with type definitions (#18940) (Arya Emami)

Documentation

ecbd522 docs: Mention code explorer (#18978) (Nicholas C. Zakas)
7ea4ecc docs: Clarifying the Use of Meta Objects (#18697) (Amaresh S M)
d3e4b2e docs: Clarify how to exclude .js files (#18976) (Milos Djermanovic)
57232ff docs: Mention plugin-kit in language docs (#18973) (Nicholas C. Zakas)
b80ed00 docs: Update README (GitHub Actions Bot)
cb69ab3 docs: Update README (GitHub Actions Bot)
7fb0d95 docs: Update README (GitHub Actions Bot)
493348a docs: Update README (GitHub Actions Bot)
87a582c docs: fix typo in id-match rule (#18944) (Jay)

Chores

555aafd chore: upgrade to @eslint/[email protected] (#18987) (Francesco Trotta)
873ae60 chore: package.json update for @eslint/js release (Jenkins)
d0a5414 refactor: replace strip-ansi with native module (#18982) (Cristopher)
b827029 chore: Enable JSON5 linting (#18979) (Milos Djermanovic)
8f55ca2 chore: Upgrade espree, eslint-visitor-keys, eslint-scope (#18962) (Nicholas C. Zakas)
c1a2725 chore: update dependency mocha to ^10.7.3 (#18945) (Milos Djermanovic)

`v9.11.1`

`v9.11.0`

Features

ec30c73 feat: add "eslint/universal" to export Linter (#18883) (唯然)
c591da6 feat: Add language to types (#18917) (Nicholas C. Zakas)
492eb8f feat: limit the name given to ImportSpecifier in id-length (#18861) (Tanuj Kanti)
19c6856 feat: Add no-useless-constructor suggestion (#18799) (Jordan Thomson)
a48f8c2 feat: add type FormatterFunction, update LoadedFormatter (#18872) (Francesco Trotta)

Bug Fixes

5e5f39b fix: add missing types for no-restricted-exports rule (#18914) (Kristóf Poduszló)
8f630eb fix: add missing types for no-param-reassign options (#18906) (Kristóf Poduszló)
d715781 fix: add missing types for no-extra-boolean-cast options (#18902) (Kristóf Poduszló)
2de5742 fix: add missing types for no-misleading-character-class options (#18905) (Kristóf Poduszló)
c153084 fix: add missing types for no-implicit-coercion options (#18903) (Kristóf Poduszló)
fa11b2e fix: add missing types for no-empty-function options (#18901) (Kristóf Poduszló)
a0deed1 fix: add missing types for camelcase options (#18897) (Kristóf Poduszló)

Documentation

e4e5709 docs: correct prefer-object-has-own type definition comment (#18924) (Nitin Kumar)
91cbd18 docs: add unicode abbreviations in no-irregular-whitespace rule (#18894) (Alix Royere)
59cfc0f docs: clarify resultsMeta in LoadedFormatter type (#18881) (Milos Djermanovic)
adcc50d docs: Update README (GitHub Actions Bot)
4edac1a docs: Update README (GitHub Actions Bot)

Build Related

959d360 build: Support updates to previous major versions (#18871) (Milos Djermanovic)

Chores

ca21a64 chore: upgrade @eslint/js @9.11.0 (#18927) (Milos Djermanovic)
a10f90a chore: package.json update for @eslint/js release (Jenkins)
e4e02cc refactor: Extract processor logic into ProcessorService (#18818) (Nicholas C. Zakas)
6d4484d chore: updates for v8.57.1 release (Jenkins)
71f37c5 refactor: use optional chaining when validating config rules (#18893) (lucasrmendonca)
2c2805f chore: Add PR note to all templates (#18892) (Nicholas C. Zakas)
7b852ce refactor: use Directive class from @eslint/plugin-kit (#18884) (Milos Djermanovic)
d594ddd chore: update dependency @eslint/core to ^0.6.0 (#18863) (renovate[bot])
78b2421 chore: Update change.yml (#18882) (Nicholas C. Zakas)
a416f0a chore: enable $ExpectType comments in .ts files (#18869) (Francesco Trotta)

`v9.10.0`

`v9.9.1`

`v9.9.0`

Features

41d0206 feat: Add support for TS config files (#18134) (Arya Emami)
3a4eaf9 feat: add suggestion to require-await to remove async keyword (#18716) (Dave)

Documentation

9fe068c docs: how to author plugins with configs that extend other configs (#18753) (Alec Gibson)
48117b2 docs: add version support page in the side navbar (#18738) (Amaresh S M)
fec2951 docs: add version support page to the dropdown (#18730) (Amaresh S M)
38a0661 docs: Fix typo (#18735) (Zaina Al Habash)
3c32a9e docs: Update yarn command for creating ESLint config (#18739) (Temitope Ogunleye)
f9ac978 docs: Update README (GitHub Actions Bot)

Chores

461b2c3 chore: upgrade to @eslint/[email protected] (#18765) (Francesco Trotta)
59dba1b chore: package.json update for @eslint/js release (Jenkins)
fea8563 chore: update dependency @eslint/core to ^0.3.0 (#18724) (renovate[bot])
aac191e chore: update dependency @eslint/json to ^0.3.0 (#18760) (renovate[bot])
b97fa05 chore: update wdio dependencies for more stable tests (#18759) (Christian Bromann)

`v9.8.0`

`v9.7.0`

Features

7bd9839 feat: add support for es2025 duplicate named capturing groups (#18630) (Yosuke Ota)
1381394 feat: add regex option in no-restricted-imports (#18622) (Nitin Kumar)

Bug Fixes

14e9f81 fix: destructuring in catch clause in no-unused-vars (#18636) (Francesco Trotta)

Documentation

9f416db docs: Add Powered by Algolia label to the search. (#18633) (Amaresh S M)
c8d26cb docs: Open JS Foundation -> OpenJS Foundation (#18649) (Milos Djermanovic)
6e79ac7 docs: loadESLint does not support option cwd (#18641) (Francesco Trotta)

Chores

793b718 chore: upgrade @eslint/js @9.7.0 (#18680) (Francesco Trotta)
7ed6f9a chore: package.json update for @eslint/js release (Jenkins)
7bcda76 refactor: Add type references (#18652) (Nicholas C. Zakas)
51bf57c chore: add tech sponsors through actions (#18624) (Strek)
6320732 refactor: don't use parent property in NodeEventGenerator (#18653) (Milos Djermanovic)
9e6d640 refactor: move "Parsing error" prefix adding to Linter (#18650) (Milos Djermanovic)

`v9.6.0`

`v9.5.0`

`v9.4.0`

`v9.3.0`

`v9.2.0`

`v9.1.1`

`v9.1.0`

`v9.0.0`

prettier/prettier (prettier)

`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 v2.3.0, we introduced "jsonc" parser which adds trialing 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 .pretterrc file

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

`v3.2.4`

Fix incorrect parser inference (#15947 by @fisker)

Files like .eslintrc.json were incorrectly formatted as JSONC files.

// Input
prettier --file-info .eslintrc.json
{ "ignored": false, "inferredParser": "jsonc" }

// Prettier 3.2.4
prettier --file-info .eslintrc.json
{ "ignored": false, "inferredParser": "json" }

`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`