Releases · biomejs/biome

15 Dec 16:33

github-actions

@biomejs/biome@2.3.9

ec43141

Biome CLI v2.3.9 Latest

Latest

2.3.9

Patch Changes

#8232 84c9e08 Thanks @ruidosujeira! - Added the nursery rule noScriptUrl.

This rule disallows the use of javascript: URLs, which are considered a form of eval and can pose security risks such as XSS vulnerabilities.
```
<a href="javascript:alert('XSS')">Click me</a>
```
#8341 343dc4d Thanks @arendjr! - Added the nursery rule useAwaitThenable, which enforces that await is only used on Promise values.

Invalid
```
await "value";

const createValue = () => "value";
await createValue();
```
Caution

This is a first iteration of the rule, and does not yet detect generic "thenable" values.
#8034 e7e0f6c Thanks @Netail! - Added the nursery rule useRegexpExec. Enforce RegExp#exec over String#match if no global flag is provided.
#8137 d407efb Thanks @denbezrukov! - Reduced the internal memory used by the Biome formatter.
#8281 30b046f Thanks @tylersayshi! - Added the rule useRequiredScripts, which enforces presence of configurable entries in the scripts section of package.json files.

#8290 d74c8bd Thanks @dyc3! - The HTML formatter has been updated to match Prettier 3.7's behavior for handling <iframe>'s allow attribute.

- <iframe allow="layout-animations 'none'; unoptimized-images 'none'; oversized-images 'none'; sync-script 'none'; sync-xhr 'none'; unsized-media 'none';"></iframe>
+ <iframe
+ 	allow="
+ 		layout-animations 'none';
+ 		unoptimized-images 'none';
+ 		oversized-images 'none';
+ 		sync-script 'none';
+ 		sync-xhr 'none';
+ 		unsized-media 'none';
+ 	"
+ ></iframe>

#8302 d1d5014 Thanks @mlafeldt! - Fixed #8109: return statements in Astro frontmatter no longer trigger "Illegal return statement" errors when using experimentalFullSupportEnabled.

#8346 f3aee1a Thanks @arendjr! - Fixed #8292: Implement tracking
of types of TypeScript constructor parameter properties.

This resolves certain false negatives in noFloatingPromises and other typed
rules.

Example

class AsyncClass {
  async returnsPromise() {
    return "value";
  }
}

class ShouldBeReported {
  constructor(public field: AsyncClass) {}
  //          ^^^^^^^^^^^^----------------- Parameter property declaration

  async shouldBeReported() {
    // `noFloatingPromises` will now report the following usage:
    this.field.returnsPromise();
  }
}

#8326 153e3c6 Thanks @ematipico! - Improved the rule noBiomeFirstException. The rule can now inspect if extended configurations already contain the catch-all ** inside files.includes and, if so, the rule suggests removing ** from the user configuration.
#8433 397547a Thanks @dyc3! - Fixed #7920: The CSS parser, with Tailwind directives enabled, will no longer error when you use things like prefix(tw) in @import at rules.
#8378 cc2a62e Thanks @Bertie690! - Clarify diagnostic message for lint/style/useUnifiedTypeSignatures

The rule's diagnostic message now clearly states that multiple similar overload signatures are hard to read & maintain, as opposed to overload signatures in general.
#8296 9d3ef10 Thanks @dyc3! - biome rage now shows if you have experimental HTML full support enabled.
#8414 09acf2a Thanks @Bertie690! - Updated the documentation & diagnostic message for lint/nursery/noProto, mentioning the reasons for its longstanding deprecation and why more modern alternatives are preferred.

Notably, the rule clearly states that using __proto__ inside object literal definitions is still allowed, being a standard way to set the prototype of a newly created object.
#8445 c3df0e0 Thanks @tt-a1i! - Fix --changed and --staged flags throwing "No such file or directory" error when a file has been deleted or renamed in the working directory. The CLI now filters out files that no longer exist before processing.
#8459 b17d12b Thanks @ruidosujeira! - Fix #8435: resolved false positive in noUnusedVariables for generic type parameters in construct signature type members (new <T>(): T).
#8439 a78774b Thanks @tt-a1i! - Fixed #8011: useConsistentCurlyBraces no longer suggests removing curly braces from JSX expression children containing characters that would cause parsing issues or semantic changes when converted to plain JSX text ({, }, <, >, &).
#8436 a392c06 Thanks @ruidosujeira! - Fixed #8429. Formatter, linter, and assist settings now correctly inherit from global configuration when not explicitly specified in overrides.

Before this fix, when an override specified only one feature (e.g., only linter), other features would be incorrectly disabled instead of inheriting from global settings.

Example configuration that now works correctly:
```
{
  "formatter": { "enabled": true },
  "overrides": [
    {
      "includes": ["*.vue"],
      "linter": { "enabled": false }
    }
  ]
}
```
After this fix, .vue files will have the linter disabled (as specified in the override) but the formatter enabled (inherited from global settings).
#8411 9f1b3b0 Thanks @rriski! - Properly handle name, type_arguments, and attributes slots for JsxOpeningElement and JsxSelfClosingElement GritQL patterns.

The following biome search commands no longer throw errors:
```
biome search 'JsxOpeningElement(name = $elem_name) where { $elem_name <: "div" }'
biome search 'JsxSelfClosingElement(name = $elem_name) where { $elem_name <: "div" }'
```
#8441 cf37d0d Thanks @tt-a1i! - Fixed #6577: noUselessUndefined no longer reports () => undefined in arrow function expression bodies. Previously, the rule would flag this pattern and suggest replacing it with () => {}, which conflicts with the noEmptyBlockStatements rule.
#8444 8caa7a0 Thanks @tt-a1i! - Fix [noUnknownMediaFeatureName](https://biomejs.dev/linter/rules/no-unknown-media-fe...

Contributors

mlafeldt, cormacrelf, and 22 other contributors

Assets 10

27 Nov 11:26

github-actions

@biomejs/biome@2.3.8

2a229e4

Biome CLI v2.3.8

2.3.8

Patch Changes

#8188 4ca088c Thanks @ematipico! - Fixed #7390, where Biome couldn't apply the correct configuration passed via --config-path.

If you have multiple root configuration files, running any command with --config-path will now apply the chosen configuration file.
#8171 79adaea Thanks @dibashthapa! - Added the new rule noLeakedRender. This rule helps prevent potential leaks when rendering components that use binary expressions or ternaries.

For example, the following code triggers the rule because the component would render 0:
```
const Component = () => {
  const count = 0;
  return <div>{count && <span>Count: {count}</span>}</div>;
};
```
#8116 b537918 Thanks @Netail! - Added the nursery rule noDuplicatedSpreadProps. Disallow JSX prop spreading the same identifier multiple times.

Invalid:
```
<div {...props} something="else" {...props} />
```
#8256 f1e4696 Thanks @cormacrelf! - Fixed a bug where logs were discarded (the kind from --log-level=info etc.). This is a regression introduced after an internal refactor that wasn't adequately tested.
#8226 3f19b52 Thanks @dyc3! - Fixed #8222: The HTML parser, with Vue directives enabled, can now parse v-slot shorthand syntax, e.g. <template #foo>.
#8007 182ecdc Thanks @brandonmcconnell! - Added support for dollar-sign-prefixed filenames in the useFilenamingConvention rule.

Biome now allows filenames starting with the dollar-sign (e.g. $postId.tsx) by default to support naming conventions used by frameworks such as TanStack Start for file-based-routing.
#8218 91484d1 Thanks @hirokiokada77! - Added the noMultiStr rule, which disallows creating multiline strings by escaping newlines.

Invalid:
```
const foo =
  "Line 1\n\
Line 2";
```
Valid:
```
const foo = "Line 1\nLine 2";
const bar = `Line 1
Line 2`;
```

#8225 98ca2ae Thanks @ongyuxing! - Fixed #7806: Prefer breaking after the assignment operator for conditional types with generic parameters to match Prettier.

-type True = unknown extends Type<
-  "many",
-  "generic",
-  "parameters",
-  "one",
-  "two",
-  "three"
->
-  ? true
-  : false;
+type True =
+  unknown extends Type<"many", "generic", "parameters", "one", "two", "three">
+    ? true
+    : false;

#6765 23f7855 Thanks @emilyinure! - Fixed #6569: Allow files to export from themselves with noImportCycles.

This means the following is now allowed:

// example.js
export function example() {
  return 1;
}

// Re-exports all named exports from the current module under a single namespace
// and then imports the namespace from the current module.
// Allows for encapsulating functions/variables into a namespace instead
// of using a static class.
export * as Example from "./example.js";

import { Example } from "./example.js";

#8214 68c052e Thanks @hirokiokada77! - Added the noEqualsToNull rule, which enforces the use of === and !== for comparison with null instead of == or !=.

Invalid:
```
foo == null;
foo != null;
```
Valid:
```
foo === null;
foo !== null;
```
#8219 793bb9a Thanks @dyc3! - Fixed #8190: The HTML parser will now parse Vue event handlers that contain : correctly, e.g. @update:modelValue="onUpdate".
#8259 4a9139b Thanks @hirokiokada77! - Fixed #8254: The noParameterAssign rule with propertyAssignment: "deny" was incorrectly reporting an error when a function parameter was used on the right-hand side of an assignment to a local variable's property.

The rule should only flag assignments that modify the parameter binding or its properties (L-value), not the use of its value.

Valid:
```
(input) => {
  const local = { property: 0 };
  local.property = input;
};
```
#8201 cd2edd7 Thanks @Netail! - Added the nursery rule noTernary. Disallow ternary operators.

Invalid:
```
const foo = isBar ? baz : qux;
```
#8172 de98933 Thanks @JeremyMoeglich! - Fixed #8145: handling of large hex literals, which previously caused both false positives and false negatives.

This affects noPrecisionLoss and noConstantMathMinMaxClamp.
#8210 7b44e9e Thanks @Netail! - Corrected rule source reference. biome migrate eslint should do a bit better detecting rules in your eslint configurations.
#8213 e430555 Thanks @ruidosujeira! - Fixed #8209: Recognized formatting capability when either range or on-type formatting is supported, not only full-file formatting. This ensures editors and the language server correctly detect formatting support in files like JSONC.
#8202 6f49d95 Thanks @hirokiokada77! - Fixed #8079: Properly handle name and value metavariables for JsxAttribute GritQL queries.

The following biome search command no longer throws an error:
```
biome search 'JsxAttribute($name, $value) as $attr where { $name <: "style" }'
```
#8276 f7e836f Thanks @hirokiokada77! - Added the noProto rule, which disallows the use of the __proto__ property for getting or setting the prototype of an object.

Invalid:
```
obj.__proto__ = a;
const b = obj.__proto__;
```
Valid:
```
const a = Object.getPrototypeOf(obj);
Object.setPrototypeOf(obj, b);
```

What's Changed

fix(noImportCycles): prevent flagging on single file import cycling by @emilyinure in #6765
chore: fix changeset by @ematipico in #8191
ci: breakdown wasm CI build by @ematipico in #8187
chore: disable docstrings in coderabbit by @Netail in #8203
feat(js_analyze): implement noTernary by @Netail in #8201
docs: missing references by @Netail in #8207
fix(biome_grit_patterns): properly handle name and value m...

Contributors

cormacrelf, arendjr, and 13 other contributors

Assets 10

21 Nov 08:48

github-actions

@biomejs/biome@2.3.7

8e97b89

Biome CLI v2.3.7

2.3.7

Patch Changes

#8169 7fdcec8 Thanks @arendjr! - Fixed #7999: Correctly place await after leading comment in auto-fix action from noFloatingPromises rule.
#8157 12d5b42 Thanks @Conaclos! - Fixed #8148. noInvalidUseBeforeDeclaration no longer reports some valid use before declarations.

The following code is no longer reported as invalid:
```
class classA {
  C = C;
}
const C = 0;
```
#8178 6ba4157 Thanks @dyc3! - Fixed #8174, where the HTML parser would parse 2 directives as a single directive because it would not reject whitespace in Vue directives. This would cause the formatter to erroneously merge the 2 directives into one, resulting in broken code.
```
- <Component v-else:property="123" />
+ <Component v-else :property="123" />
```
#8088 0eb08e8 Thanks @db295! - Fixed #7876: The noUnusedImports rule now ignores imports that are used by @linkcode and @linkplain (previously supported @link and @see).

The following code will no longer be a false positive:
```
import type { a } from "a"

/**
 * {@linkcode a}
 */
function func() {}
```
#8119 8d64655 Thanks @ematipico! - Improved the detection of the rule noUnnecessaryConditions. Now the rule isn't triggered for variables that are mutated inside a module.

This logic deviates from the original rule, hence noUnnecessaryConditions is now marked as "inspired".

In the following example, hey starts as false, but then it's assigned to a string. The rule isn't triggered inside the if check.
```
let hey = false;

function test() {
  hey = "string";
}

if (hey) {
}
```
#8149 e0a02bf Thanks @Netail! - Fixed #8144: Improve noSyncScripts, ignore script tags with type="module" as these are always non-blocking.
#8182 e9f068e Thanks @hirokiokada77! - Fixed #7877: Range suppressions now handle suppressed categories properly.

Valid:
```
// biome-ignore-start lint: explanation
const foo = 1;
// biome-ignore-end lint: explanation
```
#8111 bf1a836 Thanks @ryan-m-walker! - Added support for parsing and formatting the CSS if function.

Example
```
.basic-style {
  color: if(style(--scheme: dark): #eeeeee; else: #000000;);
}
```
#8173 7fc07c1 Thanks @ematipico! - Fixed #8138 by reverting an internal refactor that caused a regression to the rule noUnusedPrivateClassMembers.
#8119 8d64655 Thanks @ematipico! - Improved the type inference engine, by resolving types for variables that are assigned to multiple values.
#8158 fb1458b Thanks @dyc3! - Added the useVueValidVText lint rule to enforce valid v-text directives. The rule reports when v-text has an argument, has modifiers, or is missing a value.

Invalid:
```
<div v-text />

<div v-text:aaa="foo" />

<div v-text.bbb="foo" />

```
#8158 fb1458b Thanks @dyc3! - Fixed useVueValidVHtml so that it will now flag empty strings, e.g. v-html=""
#7078 bb7a15c Thanks @emilyinure! - Fixed #6675: Now only flags
noAccumulatingSpread on Object.assign when a new object is being allocated on
each iteration. Before, all cases using Object.assign with reduce parameters
were warned despite not making new allocations.

The following code will no longer be a false positive:
```
foo.reduce((acc, bar) => Object.assign(acc, bar), {});
```
The following cases which do make new allocations will continue to warn:
```
foo.reduce((acc, bar) => Object.assign({}, acc, bar), {});
```
#8175 0c8349e Thanks @ryan-m-walker! - Fixed CSS formatting of dimension units to use correct casing for Q, Hz and kHz.

Before:
```
.cssUnits {
  a: 1Q;
  b: 1Hz;
  c: 1kHz;
}
```
After:
```
.cssUnits {
  a: 1Q;
  b: 1Hz;
  c: 1kHz;
}
```

What's Changed

chore: remove gold sponsor by @ematipico in #8135
fix: next namespace by @Netail in #8142
fix(schema): domains and feature kind by @ematipico in #8147
docs(lint/html): fix some html rule docs that mess up markdown rendering on the website by @dyc3 in #8154
fix(noInvalidUseBeforeDeclaration): ignore valid use before declarations by @Conaclos in #8157
fix: noSyncScripts type="module" by @Netail in #8149
feat(css): add support for parsing and formatting the CSS if function by @ryan-m-walker in #8111
chore: add regex globals by @arendjr in #8166
ci: triggers for github merge queue by @dyc3 in #8168
fix: correctly place await after comment by @arendjr in #8169
fix(noUnusedImports): parse also linkcode, and not only link by @db295 in #8088
fix(inference): improved inference for assignment types by @ematipico in #8119
feat(lint/html/vue): add useVueValidVText by @dyc3 in #8158
fix(css): updating formatting of non-lowercase CSS dimension units by @ryan-m-walker in #8175
fix(parse/html/vue): reject whitespace before vue directive arguments by @dyc3 in #8178
fix(biome_analyze): handle suppressed categories properly for range suppressions by @hirokiokada77 in #8182
fix: only flag object assign in accumulators, if it is allocating a new object for each iter by @emilyinure in #7078
fix: revert #7684 by @ematipico in #8173
ci: release by @github-actions[bot] in #8161

New Contributors

@db295 made their first contribution in #8088

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.3.6...@biomejs/biome@2.3.7

Contributors

arendjr, ematipico, and 10 other contributors

Assets 10

17 Nov 09:30

github-actions

@biomejs/biome@2.3.6

166d95b

Biome CLI v2.3.6

2.3.6

Patch Changes

#8100 82b9a8e Thanks @Netail! - Added the nursery rule useFind. Enforce the use of Array.prototype.find() over Array.prototype.filter() followed by [0] when looking for a single result.

Invalid:
```
[1, 2, 3].filter((x) => x > 1)[0];

[1, 2, 3].filter((x) => x > 1).at(0);
```
#8118 dbc7021 Thanks @hirokiokada77! - Fixed #8117: useValidLang now accepts valid BCP 47 language tags with script subtags.

Valid:
```
<html lang="zh-Hans-CN"></html>
```
#7672 f1d5725 Thanks @Netail! - Added the nursery rule useConsistentGraphqlDescriptions, requiring all descriptions to follow the same style (either block or inline) inside GraphQL files.

Invalid:
```
enum EnumValue {
  "this is a description"
  DEFAULT
}
```
Valid:
```
enum EnumValue {
  """
  this is a description
  """
  DEFAULT
}
```
#8026 f102661 Thanks @matanshavit! - Fixed #8004: noParametersOnlyUsedInRecursion now correctly detects recursion by comparing function bindings instead of just names.

Previously, the rule incorrectly flagged parameters when a method had the same name as an outer function but called the outer function (not itself):
```
function notRecursive(arg) {
  return arg;
}

const obj = {
  notRecursive(arg) {
    return notRecursive(arg); // This calls the outer function, not the method itself
  },
};
```
Biome now properly distinguishes between these cases and will not report false positives.
#8097 5fc5416 Thanks @dyc3! - Added the nursery rule noVueVIfWithVFor. This rule disallows v-for and v-if on the same element.
```

<div v-for="item in items" v-if="item.isActive">
  {{ item.name }}
</div>
```
#8085 7983940 Thanks @Netail! - Added the nursery rule noForIn. Disallow iterating using a for-in loop.

Invalid:
```
for (const i in array) {
  console.log(i, array[i]);
}
```
#8086 2b41e82 Thanks @matanshavit! - Fixed #8045: The noNestedTernary rule now correctly detects nested ternary expressions even when they are wrapped in parentheses (e.g. foo ? (bar ? 1 : 2) : 3).

Previously, the rule would not flag nested ternaries like foo ? (bar ? 1 : 2) : 3 because the parentheses prevented detection. The rule now looks through parentheses to identify nested conditionals.

Previously not detected (now flagged):
```
const result = foo ? (bar ? 1 : 2) : 3;
```
Still valid (non-nested with parentheses):
```
const result = foo ? bar : baz;
```
#8075 e403868 Thanks @YTomm! - Fixed #7948: The useReadonlyClassProperties code fix when checkAllProperties is enabled will no longer insert a newline after readonly and the class property.
#8102 47d940e Thanks @lucasweng! - Fixed #8027. useReactFunctionComponents no longer reports class components that implement componentDidCatch using class expressions.

The rule now correctly recognizes error boundaries defined as class expressions:
```
const ErrorBoundary = class extends Component {
  componentDidCatch(error, info) {}

  render() {
    return this.props.children;
  }
};
```
#8097 5fc5416 Thanks @dyc3! - Added the nursery rule useVueHyphenatedAttributes, which encourages using kebab case for attribute names, per the Vue style guide's recommendations.
```

<MyComponent myProp="value" />


<MyComponent my-prop="value" />
```

#8108 0f0a658 Thanks @Netail! - Added the nursery rule noSyncScripts. Prevent the usage of synchronous scripts.

Invalid:

<script src="https://third-party-script.js" />

Valid:

<script src="https://third-party-script.js" async />
<script src="https://third-party-script.js" defer />

#8098 1fdcaf0 Thanks @Jayllyz! - Added documentation URLs to rule descriptions in the JSON schema.
#8097 5fc5416 Thanks @dyc3! - Fixed an issue with the HTML parser where it would treat Vue directives with dynamic arguments as static arguments instead.
#7684 f4433b3 Thanks @vladimir-ivanov! - Changed noUnusedPrivateClassMembers to align more fully with meaningful reads.

This rule now distinguishes more carefully between writes and reads of private class members.
- A meaningful read is any access that affects program behavior.
- For example, this.#x += 1 both reads and writes #x, so it counts as usage.
- Pure writes without a read (e.g. this.#x = 1 with no getter) are no longer treated as usage.
This change ensures that private members are only considered “used” when they are actually read in a way that influences execution.

Invalid examples (previously valid)
```
class UsedMember {
  set #x(value) {
    doSomething(value);
  }

  foo() {
    // This assignment does not actually read #x, because there is no getter.
    // Previously, this was considered a usage, but now it’s correctly flagged.
    this.#x = 1;
  }
}
```
Valid example (Previously invalid)
```
class Foo {
  #usedOnlyInWriteStatement = 5;

  method() {
    // This counts as a meaningful read because we both read and write the value.
    this.#usedOnlyInWriteStatement += 42;
  }
}
```
#7684 f4433b3 Thanks @vladimir-ivanov! - Improved detection of used private class members

The analysis for private class members has been improved: now the tool only considers a private member “used” if it is actually referenced in the code.
- Previously, some private members might have been reported as used even if they weren’t actually accessed.
- With this change, only members that are truly read or called in the code are counted as used.
- Members that are never accessed will now be correctly reported as unused.
This makes reports about unused private members more accurate and helps you clean up truly unused code.

Example (previously valid)
```
type YesNo = "yes" | "no";

export class SampleYesNo {
  private yes: () => void;
  private no: () => void;
  private dontKnow: () => void; // <- will now report as unused

  on(action: YesNo): void {
    this[action]();
  }
}
```
#7681 b406db6 Thanks @kedevked! - Added the new lint rule, useSpread, po...

Contributors

ematipico, vladimir-ivanov, and 13 other contributors

Assets 10

11 Nov 12:33

github-actions

@biomejs/biome@2.3.5

0a2f617

Biome CLI v2.3.5

2.3.5

Patch Changes

#8023 96f3e77 Thanks @ematipico! - Added support Svelte syntax {@html}. Biome now is able to parse and format the Svelte syntax {@html}:
```
-{@html   'div'}
+{@html 'div'}
```
The contents of the expressions inside the {@html <expression>} aren't formatted yet.
#8058 5f68bcc Thanks @ematipico! - Fixed a bug where the Biome Language Server would enable its project file watcher even when no project rules were enabled.

Now the watching of nested configuration files and nested ignore files is delegated to the editor, if their LSP spec supports it.
#8023 96f3e77 Thanks @ematipico! - Added support Svelte syntax {@render}. Biome now is able to parse and format the Svelte syntax {@render}:
```
-{@render   sum(1, 2)   }
+{@render sum(1, 2)}
```
The contents of the expressions inside the {@render <expression>} aren't formatted yet.
#8006 f0612a5 Thanks @Bertie690! - Updated documentation and diagnostic for lint/complexity/noBannedTypes. The rule should have a more detailed description and diagnostic error message.
#8039 da70d8b Thanks @PFiS1737! - Biome now keeps a blank line after the frontmatter section in Astro files.
#8042 b7efa6f Thanks @dyc3! - The CSS Parser, with tailwindDirectives enabled, will now accept at rules like @media and @supports in @custom-variant shorthand syntax.
#8064 3ff9d45 Thanks @dibashthapa! - Fixed #7967: Fixed the issue with support for advanced SVG props
#8023 96f3e77 Thanks @ematipico! - Added support Svelte syntax {@attach}. Biome now is able to parse and format the Svelte syntax {@attach}:
```
-<div {@attach    myAttachment   }>...</div>
+<div {@attach myAttachment}>...</div>
```
The contents of the expressions inside the {@attach <expression>} aren't formatted yet.
#8001 6e8a50e Thanks @ematipico! - Added support Svelte syntax {#key}. Biome now is able to parse and format the Svelte syntax {#key}:
```
-{#key   expression} <div></div> {/key}
+{#key expression}
+  <div></div>
+{/key}
```
The contents of the expressions inside the {#key <expression>} aren't formatted yet.
#8023 96f3e77 Thanks @ematipico! - Added support Svelte syntax {@const}. Biome now is able to parse and format the Svelte syntax {@const}:
```
-{@const   name = value}
+{@const name = value}
```
The contents of the expressions inside the {@const <expression>} aren't formatted yet.
#8044 8f77d4a Thanks @Netail! - Corrected rule source references. biome migrate eslint should do a bit better detecting rules in your eslint configurations.
#8065 1a2d1af Thanks @Netail! - Added the nursery rule useArraySortCompare. Require Array#sort and Array#toSorted calls to always provide a compareFunction.

Invalid:
```
const array = [];
array.sort();
```
Valid:
```
const array = [];
array.sort((a, b) => a - b);
```
#7673 a3a713d Thanks @dyc3! - The HTML parser is now able to parse vue directives. This enables us to write/port Vue lint rules that require inspecting the <template> section. However, this more complex parsing may result in parsing errors where there was none before. For those of you that have opted in to the experimental support (aka experimentalFullSupportEnabled), we greatly appreciate your help testing this out, and your bug reports.

#8031 fa6798a Thanks @ematipico! - Added support for the Svelte syntax {#if}{/if}. The Biome HTML parser is now able to parse and format the {#if}{/if} blocks:

<!-- if / else-if / else -->
{#if porridge.temperature > 100}
-<p>too hot!</p>
+  <p>too hot!</p>
{:else if 80 > porridge.temperature}
-<p>too cold!</p>
+  <p>too cold!</p>
{:else if 100 > porridge.temperature}
-<p>too too cold!</p>
+  <p>too too cold!</p>
{:else}
-<p>just right!</p>
+  <p>just right!</p>
{/if}

#8041 beeb7bb Thanks @dyc3! - The CSS parser, with tailwindDirectives enabled, will now accept lists of selectors in @custom-variant shorthand syntax.
```
@custom-variant cell (th:has(&), td:has(&));
```
#8028 c09e45c Thanks @fmajestic! - The GitLab reporter now outputs format errors.
#8037 78011b1 Thanks @PFiS1737! - indentScriptAndStyle no longer indents the frontmatter in Astro files.
#8009 6374b1f Thanks @tmcw! - Fixed an edge case in the useArrowFunction rule.

The rule no longer emits diagnostics for or offers to fix functions that reference
the arguments object,
because that object is undefined for arrow functions.

Valid example:
```
// Valid: this function cannot be transformed into an arrow function because
// arguments is not defined for arrow functions.
const getFirstArg = function () {
  return arguments[0];
};
```

What's Changed

feat(html/svelte): key blocks by @ematipico in #8001
chore(parser): increase size of TokenSet by @ryan-m-walker in #7997
feat(html/svelte): parsing of new blocks by @ematipico in #8023
fix(useArrowFunction): make useArrowFunction rule fixer safer by @tmcw in #8009
fix(deps): update rust crates by @renovate[bot] in #7889
feat(cli): add format errors to GitLab reporter by @fmajestic in #8028
fix(html/astro): don't indent Astro frontmatter by @PFiS1737 in #8037
fix(html/astro): keep a blank after the frontmatter by @PFiS1737 in #8039
fix(parse/tailwind): fix lexing inset-x, border-slate-500, and others by @dyc3 in #7975
fix(parse/css/tailwind): make @custom-variant accept selector lists by @dyc3 in #8041
docs: rules.rs cleanup by @Netail in #8044
docs: update documentation + diagnostic for noBannedTypes description by @Bertie690 in #8006
refactor(deserialize): exact allocation for arrays and maps by @Conaclos in #8040
feat(parse/tailwind): add benchmark by @dyc3 in #7976
feat(html/svelte): if/else syntax by @ematipico in #8031
fix(parse/css/tailwind): make @custom-variant accept at-rules like @media...

Contributors

tmcw, ematipico, and 9 other contributors

Assets 10

05 Nov 13:57

github-actions

@biomejs/biome@2.3.4

e8b6753

Biome CLI v2.3.4

2.3.4

Patch Changes

#7989 4855c4a Thanks @alissonlauffer! - Fixed a regression in Astro frontmatter parsing where comments inside quoted strings were incorrectly detected as actual comments. This caused the parser to prematurely terminate frontmatter parsing when encountering strings like const test = "//";.
For example, the following Astro frontmatter now parses correctly:
```
---
const test = "// not a real comment";
---
```
#7968 0b28f5f Thanks @denbezrukov! - Refactored formatter to use strict Token element for better performance. The new Token variant is optimized for static, ASCII-only text (keywords, operators, punctuation) with the following constraints:
- ASCII only (no Unicode characters)
- No newlines (\n, \r)
- No tab characters (\t)
This enables faster printing and fitting logic by using bulk string operations (push_str, len()) instead of character-by-character iteration with Unicode width calculations.

#7941 19b8280 Thanks @Conaclos! - Fixed #7943. Rules' options are now properly merged with the inherited options from a shared configuration.

This means that you can now override a specific option from a rule without resetting the other options to their default.

Given the following shared configuration:

{
  "linter": {
    "rules": {
      "style": {
        "useNamingConvention": {
          "level": "on",
          "options": {
            "strictCase": false,
            "conventions": [
              {
                "selector": { "kind": "variable", "scope": "global" },
                "formats": ["CONSTANT_CASE"]
              }
            ]
          }
        }
      }
    }
  }
}

And the user configuration that extends this shared configuration:

{
  "extends": ["shared.json"],
  "linter": {
    "rules": {
      "style": {
        "useNamingConvention": {
          "level": "on",
          "options": { "strictCase": true }
        }
      }
    }
  }
}

The obtained merged configuration is now as follows:

{
  "extends": ["shared.json"],
  "linter": {
    "rules": {
      "style": {
        "useNamingConvention": {
          "level": "on",
          "options": {
            "strictCase": true,
            "conventions": [
              {
                "selector": { "kind": "variable", "scope": "global" },
                "formats": ["CONSTANT_CASE"]
              }
            ]
          }
        }
      }
    }
  }
}

#7969 425963d Thanks @ematipico! - Added support for the Svelte syntax {@debug}. The Biome HTML parser is now able to parse and format the blocks:
```
-{@debug     foo,bar,    something}
+{@debug foo, bar, something}
```
#7986 3256f82 Thanks @lisiur! - Fixed #7981. Now Biome correctly detects and parses lang='tsx' and lang='jsx' languages when used inside in .vue files, when .experimentalFullSupportEnabled is enabled.
#7921 547c2da Thanks @dyc3! - Fixed #7854: The CSS parser, with tailwindDirectives enabled, will now parse @source inline("underline");.

#7856 c9e20c3 Thanks @Netail! - Added the nursery rule noContinue. Disallowing the usage of the continue statement, structured control flow statements such as if should be used instead.

Invalid:

let sum = 0,
  i;

for (i = 0; i < 10; i++) {
  if (i >= 5) {
    continue;
  }

  sum += i;
}

Valid:

let sum = 0,
  i;

for (i = 0; i < 10; i++) {
  if (i < 5) {
    sum += i;
  }
}

What's Changed

fix(parse/css): parse tailwind @source inline(...) by @dyc3 in #7921
feat(html): implement {@debug} parsing by @ematipico in #7969
fix(parse/tailwind): fix lexing variants that start with numbers by @dyc3 in #7966
feat(lint): implement noContinue by @Netail in #7856
fix(config): implement Merge for rules' options by @Conaclos in #7941
chore: add graphite as bronze sponsor by @dyc3 in #7974
chore: graphql tests options by @Netail in #7979
refactor(formatter): introduce Token element by @denbezrukov in #7968
fix(ROME_CHANGELOG.md): grammar and typo error by @WuMingDao in #7992
chore(parser): increase size of SyntaxKindSet bitfield by @ryan-m-walker in #7994
fix(RELEASES.md): grammar and typo error by @WuMingDao in #7993
fix(html): fix comment detection in Astro frontmatter by @alissonlauffer in #7989
feat: support html.experimentalFullSupportEnabled for vue with jsx/tsx script by @lisiur in #7986
ci: release by @github-actions[bot] in #7965

New Contributors

@WuMingDao made their first contribution in #7992
@lisiur made their first contribution in #7986

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.3.3...@biomejs/biome@2.3.4

Contributors

ematipico, dyc3, and 7 other contributors

Assets 10

03 Nov 09:56

github-actions

@biomejs/biome@2.3.3

fd282fc

Biome CLI v2.3.3

2.3.3

Patch Changes

#7907 57bd662 Thanks @ematipico! - Fixed #7839. Now the Biome parser correctly parses the Astro frontmatter even when a triple fence is inside quotes.
#7934 a35c496 Thanks @alissonlauffer! - Fixed #7919: The HTML parser now correctly handles Unicode BOM (Byte Order Mark) characters at the beginning of HTML files, ensuring proper parsing and tokenization.
#7869 c80361d Thanks @matanshavit! - Fixed #7864: Biome now preserves component tag name casing in Svelte, Astro, and Vue files.
#7926 69cecec Thanks @matanshavit! - Added the rule noParametersOnlyUsedInRecursion.

This rule detects function parameters that are exclusively used in recursive calls and can be removed to simplify the function signature since they are effectively unused.
```
function factorial(n, acc) {
  if (n === 0) return 1;
  return factorial(n - 1, acc); // acc is only used here
}
```
Fixes #6484.
#7774 2509b91 Thanks @dibashthapa! - Fixed #7657: Added the new rule no-unknown-property from ESLint
#7918 7165d06 Thanks @dyc3! - Fixed #7913: The CSS parser, with tailwindDirectives enabled, will now correctly handle @slot.
#7959 ffae203 Thanks @siketyan! - Fixed the Biome Language Server so it no longer returns an internal error when the formatter is disabled in the configuration.

What's Changed

fix(html): parse frontmatter inside quotes by @ematipico in #7907
fix(parse/css): add @slot tailwind at rule by @dyc3 in #7918
fix(formatter): preserve component tag casing in Svelte/Astro/Vue files by @matanshavit in #7869
feat(lint): new rule: no parameters only used in recursion by @matanshavit in #7926
fix(html): correctly handle BOM in HTML-ish languages by @alissonlauffer in #7934
feat(yaml_parser): parse document end token by @l0ngvh in #7936
feat(parse/tailwind): parse negative candidates, other misc cleanup/refactors by @dyc3 in #7937
feat(lint): implement no-unknown-property from eslint react by @dibashthapa in #7774
chore: update Rust to v1.91.0 by @Gumichocopengin8 in #7947
chore(deps): update github-actions by @renovate[bot] in #7952
chore(deps): update dependency @types/node to v22.19.0 by @renovate[bot] in #7953
chore(deps): update rust crate ignore to 0.4.25 by @renovate[bot] in #7954
chore(deps): update dependency eslint to v9.39.0 - autoclosed by @renovate[bot] in #7955
fix(console): escape backquotes in MDX context by @siketyan in #7956
fix(lsp): do not return error if the formatter is disabled by @siketyan in #7959
ci: release by @github-actions[bot] in #7916

New Contributors

@matanshavit made their first contribution in #7869
@alissonlauffer made their first contribution in #7934
@dibashthapa made their first contribution in #7774

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.3.2...@biomejs/biome@2.3.3

Contributors

ematipico, dyc3, and 7 other contributors

Assets 10

28 Oct 18:49

github-actions

@biomejs/biome@2.3.2

6d95a67

Biome CLI v2.3.2

2.3.2

Patch Changes

#7859 c600618 Thanks @Netail! - Added the nursery rule noIncrementDecrement, disallows the usage of the unary operators ++ and --.
#7901 0d17b05 Thanks @ematipico! - Fixed #7837, where Biome couldn't properly parse text expressions that contained nested curly brackets. This was breaking parsing in Astro and Svelte files.
#7874 e617d36 Thanks @Bertie690! - Fixed #7230: noUselessStringConcat no longer emits false positives for multi-line strings with leading + operators.

Previously, the rule did not check for leading newlines on the + operator, emitting false positives if one occurred at the start of a line.
Notably, formatting with operatorLinebreak="before" would move the + operators to the start of lines automatically, resulting in spurious errors whenever a multi-line string was used.

Now, the rule correctly detects and ignores multi-line concatenations with leading operators as well, working regardless of the setting of operatorLinebreak.

Example
```
// The following code used to error if the `+` operators were at the start of lines (as opposed to the end).
// Now, the rule correctly recognizes this as a stylistic concatenation and ignores it.
const reallyLongStringThatShouldNotError =
  "Lorem ipsum dolor sit amet consectetur adipiscing elit." +
  "Quisque faucibus ex sapien vitae pellentesque sem placerat." +
  "In id cursus mi pretium tellus duis convallis." +
  "Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla";
```
#7786 33ffcd5 Thanks @daivinhtran! - Fixed #7601: Properly match Grit plugin's code snippet with only one child.
#7901 0d17b05 Thanks @ematipico! - Fixed #7837, where Biome Language Server panicked when opening HTML-ish files when the experimental full support is enabled.

What's Changed

fix(lint): noUselessStringConcat now correctly detects leading concatenation operators from operatorLinebreak=before by @Bertie690 in #7874
chore(deps): update rust crate globset to 0.4.18 by @renovate[bot] in #7883
chore(deps): update rust crate ignore to 0.4.24 by @renovate[bot] in #7884
chore(deps): update rust crate proc-macro2 to 1.0.103 by @renovate[bot] in #7885
chore(deps): update rust crate tikv-jemallocator to 0.6.1 by @renovate[bot] in #7886
fix(lint): extend matcher for GritCodeSnippet to cover edge case by @daivinhtran in #7786
feat(js): update Boa to v0.21.0 by @Gumichocopengin8 in #7888
chore(deps): update dependency eslint to v9.38.0 by @renovate[bot] in #7890
chore(deps): update rust crate indexmap to 2.12.0 by @renovate[bot] in #7891
chore(deps): update github-actions - autoclosed by @renovate[bot] in #7892
chore(deps): update rust crate rayon to 1.11.0 by @renovate[bot] in #7894
chore(deps): update rust crate regex to 1.12.2 by @renovate[bot] in #7895
chore(deps): update rust crate tokio to 1.48.0 by @renovate[bot] in #7896
fix(core): text expression parsing and LSP file opening by @ematipico in #7901
feat(lint): implement noIncrementDecrement by @Netail in #7859
ci: release by @github-actions[bot] in #7887

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.3.1...@biomejs/biome@2.3.2

Contributors

ematipico, renovate, and 4 other contributors

Assets 10

26 Oct 19:51

github-actions

@biomejs/biome@2.3.1

be79a6b

Biome CLI v2.3.1

2.3.1

Patch Changes

#7840 72afdfa Thanks @ematipico! - Fixed #7838, which caused the new --css-parse-* arguments not being recognised by the ci command.
#7789 d5b416e Thanks @fronterior! - Fixed the LSP method workspace/didChangeWorkspaceFolders to perform incremental updates instead of replacing the entire folder list.
#7852 bd254c7 Thanks @dyc3! - Fixed #7843: The CSS parser, when tailwindDirectives is enabled, correctly parses --*: initial;.
#7872 0fe13fe Thanks @dyc3! - Fixed #7861: The HTML parser will now accept Svelte attribute shorthand syntax in .svelte files.
#7866 7b2600b Thanks @dyc3! - Fixed #7860: The css parser, with tailwindDirectives enabled, will now accept @plugin options.
#7853 fe90c78 Thanks @dyc3! - Fixed #7848: The css parser with tailwindDirectives enabled will now correctly parse tailwind's source exclude syntax: @source not "foo.css";
#7878 c9f7fe5 Thanks @ematipico! - Fixed #7857: Biome now parses <script> tags as TypeScript when analysing .astro files.
#7867 b42b718 Thanks @smorimoto! - Fixed incorrect option name in HTML parser error message.

The error message for disabled text expressions incorrectly referred
to the html.parser.textExpression option, which does not exist.
Updated it to reference the correct html.parser.interpolation option.

What's Changed

fix(cli): css parsing arguments for ci command by @ematipico in #7840
chore: document rule-group severity relation and update rules_check by @Conaclos in #7827
fix(lsp): make update_workspace_folders perform incremental updates per LSP spec by @fronterior in #7789
ci(rules-check): add noSecrets exception by @Conaclos in #7862
ci: fix clippy failure by @Conaclos in #7863
fix(parse/css): fix parsing --*: initial; with tailwindDirectives enabled by @dyc3 in #7852
fix(parse/css): fix parsing tailwind source exclude syntax by @dyc3 in #7853
fix(core): parse astro script as TS by @ematipico in #7878
fix(biome_html_parser): fix incorrect option name in HTML parser error message by @smorimoto in #7867
chore: ai docs revamp by @ematipico in #7879
fix(parse/css): allow @plugin to accept options by @dyc3 in #7866
feat(parse/html): parse svelte shorthand props and spread props by @dyc3 in #7872
ci: release by @github-actions[bot] in #7842

New Contributors

@fronterior made their first contribution in #7789
@smorimoto made their first contribution in #7867

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.3.0...@biomejs/biome@2.3.1

Contributors

ematipico, dyc3, and 3 other contributors

Assets 10

24 Oct 08:39

github-actions

@biomejs/js-api@4.0.0

53ffa8b

JavaScript APIs v4.0.0

4.0.0

Patch Changes

Updated dependencies []:
- @biomejs/wasm-web@2.3.0
- @biomejs/wasm-bundler@2.3.0
- @biomejs/wasm-nodejs@2.3.0

What's Changed

feat(resolver): support baseUrl in tsconfig.json by @arendjr in #7263
feat(parse/css): add option to parse Tailwind v4 directives by @dyc3 in #7164
feat(format/css): implement formatters for new tailwind nodes by @dyc3 in #7241
fix(parse/css): let @utility parse declarations and rules by @dyc3 in #7314
feat: indentation for vue and svelte files by @ematipico in #7330
feat(htmlish): implement indentScriptAndStyle option by @dyc3 in #7333
feat(core): add force-ignore syntax to files.includes by @arendjr in #7359
feat(cli): --skip/--only with domains by @ematipico in #7392
chore: ensure force-ignore syntax works with nested biome.json by @arendjr in #7444
feat(core): embedded formatting in html files by @ematipico in #7467
feat: add react library aliases by @kpapa05 in #7488
chore: add .oxlintrc.json to well-known files by @TheAlexLichter in #7536
chore: introduce ruledoc utils by @arendjr in #7541
fix: resolve parse errors in ruledoc code blocks by @arendjr in #7544
feat(lint): move some rules to the react domain by @siketyan in #7548
perf: optimise embedded formatter by @arendjr in #7567
feat: implemented embedded JSON parsing by @arendjr in #7571
perf: only query settings once by @arendjr in #7593
feat: add 'auto' mode to lineEndings by @anaisbetts in #7599
feat: emit diagnostics from embedded nodes by @ematipico in #7632
chore: AnyEmbeddedSnippet terminology by @arendjr in #7674
feat(cli): print info count by @ematipico in #7667
feat(core): apply code fixes in snippets by @ematipico in #7670
feat(html): analyzer by @ematipico in #5814
fix: incorrect logic for CSS fix all by @ematipico in #7699
feat(reporter): add checkstyle by @wrick17 in #6356
feat(cli): rdjson reporter by @ematipico in #7698
feat(cli): expose formatWithErrors via --format-with-errors flag by @cadunass in #7719
feat(cli): add parsing arguments by @ematipico in #7723
feat(core): full experimental support htmlish languages by @ematipico in #7702
fix: typescript types generation by @ematipico in #7743
feat(noUnknownAtRule): add ignore option by @dyc3 in #7745
chore: add migration for ignores scanner by @ematipico in #7751
feat(biome_js_analyze): added support for React 19.2 by @barklund in #7669
feat(cli): enhance init command by @ematipico in #7753
feat: promote lint rules by @ematipico in #7758
chore: remove errors logs by @ematipico in #7819
fix(lsp): load extension settings before configuration on document open by @gaauwe in #7764
fix(useNamingConvention): don't panic on $ name by @Conaclos in #7825
feat(linter): implement useVueDefineMacrosOrder by @minht11 in #7712
docs: fix typo in ignoreUnknown option description by @plmrry in #7829
chore: release v2.3.0 by @ematipico in #7708
test: use Manifest::read_manifest to insert tsconfig by @siketyan in #7832
chore: fix LSP astro test by @ematipico in #7833
ci: additional workflow for rules check by @ematipico in #7823
ci: release by @github-actions[bot] in #7824

New Contributors

@kpapa05 made their first contribution in #7488
@TheAlexLichter made their first contribution in #7536
@anaisbetts made their first contribution in #7599
@wrick17 made their first contribution in #6356
@cadunass made their first contribution in #7719
@barklund made their first contribution in #7669
@gaauwe made their first contribution in #7764
@plmrry made their first contribution in #7829

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.2.7...@biomejs/js-api@4.0.0

Contributors

anaisbetts, arendjr, and 12 other contributors

Assets 2

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Biome CLI v2.3.9

2.3.9

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2.3.8

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2.3.7

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2.3.6

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2.3.5

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2.3.4

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2.3.3

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2.3.2

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2.3.1

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