biomejs/biome @biomejs/biome@2.4.5 on GitHub

2.4.5

Patch Changes

#9185 e43e730 Thanks @dyc3! - Added the nursery rule useVueScopedStyles for Vue SFCs. This rule enforces that <style> blocks have the scoped attribute (or module for CSS Modules), preventing style leakage and conflicts between components.
#9184 49c8fde Thanks @chocky335! - Improved plugin performance by batching all plugins into a single syntax visitor with a kind-to-plugin lookup map, reducing per-node dispatch overhead from O(N) to O(1) where N is the number of plugins.
#9283 071c700 Thanks @dyc3! - Fixed noUndeclaredVariables erroneously flagging functions and variables defined in the <script setup> section of Vue SFCs.
#9221 4612133 Thanks @ematipico! - Fixed an issue where the JSON reporter didn't contain the duration of the command.
#9294 1805c8f Thanks @Netail! - Extra rule source reference. biome migrate eslint should do a bit better detecting rules in your eslint configurations.
#9178 101b3bb Thanks @Bertie690! - Fixed #9172 and #9168:
Biome now considers more constructs as valid test assertions.
Previously, assert, expectTypeOf and assertType
were not recognized as valid assertions by Biome's linting rules, producing false positives in lint/nursery/useExpect and other similar rules.
Now, these rules will no longer produce errors in test cases that used these constructs instead of expect:
```
import { expectTypeOf, assert, assertType } from "vitest";

const myStr = "Hello from vitest!";
it("should be a string", () => {
  expectTypeOf(myStr).toBeString();
});
test("should still be a string", () => {
  assertType<string>(myStr);
});
it.todo("should still still be a string", () => {
  assert(typeof myStr === "string");
});
```
#9173 32dad2d Thanks @dyc3! - Added parsing support for Svelte's new comments-in-tags feature.
The HTML parser will now accept JS style comments in tags in Svelte files.
```
<button
  // single-line comment
  onclick={doTheThing}
>click me</button>

<div
  /* block comment */
  class="foo"
>text</div>
```
#8952 1d2ca15 Thanks @pkallos! - Added the nursery rule useNullishCoalescing. This rule suggests using the nullish coalescing operator (??) instead of logical OR (||) when the left operand may be nullish. This prevents bugs where falsy values like 0, '', or false are incorrectly treated as missing. Addresses #8043
```
// Invalid
declare const x: string | null;
const value = x || "default";

// Valid
const value = x ?? "default";
```
#9243 1992a85 Thanks @Netail! - Fixed #7813: improved the diagnostic of the rule useExhaustiveDependencies. The diagnostic now shows the name of the variable to add to the dependency array.

#9063 3d0648f Thanks @taga3s! - Added the nursery rule noVueRefAsOperand. This rule disallows cases where a ref is used as an operand.

The following code is now flagged:

import { ref } from "vue";

const count = ref(0);
count++; // Should be: count.value++

import { ref } from "vue";

const ok = ref(false);
if (ok) {
  // Should be: if (ok.value)
  //
}

#9273 f239e20 Thanks @denbezrukov! - Fixed #9253: parsing of @container scroll-state(...) queries.

@container scroll-state(scrolled: bottom) {
}
@container scroll-state(stuck) {
}
@container scroll-state(not (stuck)) {
}
@container scroll-state((stuck) and (scrolled: bottom)) {
}
@container scroll-state((stuck) or (snapped: x)) {
}
@container main-layout scroll-state(not ((stuck) and (scrolled: bottom))) {
}

#9259 96939c0 Thanks @ematipico! - Fixed CSS formatter incorrectly collapsing selectors when a BOM (Byte Order Mark) character is present at the start of the file. The formatter now correctly preserves line breaks between comments and selectors in BOM-prefixed CSS files, matching Prettier's behavior.
#9251 59e33fb Thanks @ematipico! - Fixed #9249: The CSS formatter no longer incorrectly breaks ratio values (like 1 / -1) across lines when followed by comments.
#9284 ec3a17f Thanks @denbezrukov! - Fixed #9253: removed false-positive diagnostics for valid @container/@supports general-enclosed queries.
```
@container scroll-state(scrolled: bottom) {
}
@supports foo(bar: baz) {
}
```
#9215 b2619a1 Thanks @FrederickStempfle! - Fixed #9189: biome ci in GitHub Actions now correctly disables colors so that ::error/::warning workflow commands are not wrapped in ANSI escape codes.
#9256 65ae4c1 Thanks @ematipico! - Fixed JSON reporter escaping of special characters in diagnostic messages. The JSON reporter now properly escapes double quotes, backslashes, and control characters in error messages and advice text, preventing invalid JSON output when diagnostics contain these characters.
#9223 5b9da81 Thanks @ematipico! - Fixed an issue where the JSON reporter didn't write output to a file when --reporter-file was specified. The output is now correctly written to the specified file instead of always going to stdout.
#9154 c487e54 Thanks @abossenbroek! - Fixed #9115: The noPlaywrightMissingAwait rule no longer produces false positives on jest-dom matchers like toBeVisible, toBeChecked, toHaveAttribute, etc. For matchers shared between Playwright and jest-dom, the rule now checks whether expect()'s argument is a Playwright locator or page object before flagging. Added semantic variable resolution so that extracted Playwright locators (e.g. const loc = page.locator('.item'); expect(loc).toBeVisible()) are still correctly flagged.
#9269 33e5cdf Thanks @dyc3! - Fixed a false positive where noUndeclaredVariables reported bindings from Vue <script setup> as undeclared when used in <template>.
This change ensures embedded bindings collected from script snippets (like imports and defineModel results) are respected by the rule.
#9267 2c2e060 Thanks @ematipico! - Fixed #9143 and #8849: The noUnresolvedImports rule no longer reports false positives for several common patterns:
- node:fs, node:path, node:url, and other Node.js built-in modules with the node: prefix are now accepted.
- Packages that declare their TypeScript entry point via "typings" (instead of "types") in package.json now resolve correctly.
- Named imports from aliased re-export chains (e.g. export { x as y } from "...") are now resolved correctly through the alias.
- Namespace re-exports (e.g. export * as Ns from "...") are now recognized as own exports of the barrel module.
#9254 f7bf12b Thanks @ematipico! - Fixed #8842: The CSS formatter now correctly formats @container scroll-state() without adding an unwanted space between the function name and opening parenthesis.
#9211 2d0b8e6 Thanks @ematipico! - Fixed #7905. Improved the accuracy of type-aware lint rules when analyzing re-exported functions and values.
Previously, when a binding was imported from another module, its type was not correctly inferred during the type analysis phase. This caused type-aware lint rules to fail to detect issues when working with re-exported imports.
The following rules now correctly handle re-exported imports:
- useAwaitThenable
- noFloatingPromises
- noMisusedPromises
- useArraySortCompare
Example of now-working detection:
```
// getValue.ts
export async function getValue(): Promise<number> {
  return 42;
}

// reexport.ts
export { getValue } from "./getValue";

// index.ts
import { getValue } from "./reexport";

// Previously: no diagnostic (type was unknown)
// Now: correctly detects that getValue() returns a Promise
await getValue(); // Valid - properly awaited
getValue(); // Diagnostic - floating promise
```
#8934 b49707c Thanks @tim-we! - Fixed #8265: Biome now correctly detects test framework calls that use three arguments (label, options, callback) (e.g., describe("foo", { retry: 2 }, () => {})). This fixes both formatting and the noDuplicateTestHooks lint rule for test frameworks like Vitest.
#9191 688fd34 Thanks @dyc3! - Fixed #9180: fixed a panic caused by an interaction between noRedundantUseStrict and the formatter
#9048 9bbdf4d Thanks @ff1451! - Added the nursery rule useNamedCaptureGroup.
The rule enforces using named capture groups in regular expressions instead of numbered ones. It supports both regex literals and RegExp constructor calls.
```
// Invalid: unnamed capture group
/(foo)/;
new RegExp("(foo)");

// Valid: named capture group
/(?<id>foo)/;
new RegExp("(?<id>foo)");
```
#9255 9b6685b Thanks @ematipico! - Fixed #9234, where some nursery rules panicked when they were configured with the option level without the corresponding options.
#8968 a2b4494 Thanks @LouisLau-art! - Fixed #8812: lint/suspicious/noArrayIndexKey will now report index usage anywhere in JSX key template or binary expressions, not only in the last visited identifier.
#9266 84935a4 Thanks @dyc3! - Fixed #9250: noVueDuplicateKeys will no longer flag keys under watch, preventing false positives.
#9056 1f2fe2e Thanks @ruidosujeira! - Added the nursery rule useArraySome to prefer .some() over verbose existence checks like filter(...).length > 0 and findIndex(...) !== -1, with suggestions for find/findLast existence checks. This also applies to ES2025 iterator helpers such as Iterator.prototype.find.
#9163 f87acf6 Thanks @JUSTIVE! - Added graphql to valid embedded graphql template tags inside JavaScript files, when the feature javascript.experimentalEmbeddedSnippetsEnabled is enabled. This allows proper support for graphql tags used in RelayJS.
Now, code snippets like the following are correctly formatted and limited:
```
import { graphql } from "react-relay";

const query = graphql`
  query {
    user(id: 1) {
      id
      name
    }
  }
`;
```
#8773 6b01778 Thanks @xcb3d! - Added the new nursery rule useUnicodeRegex.
The rule enforces the use of the u or v flag for regular expressions. This ensures proper handling of Unicode characters like emoji.
```
// Invalid
/foo/;
new RegExp("foo", "gi");

// Valid
/foo/u;
new RegExp("foo", "giu");
```

What's Changed

test(markdown): add minimal service plumbing for formatter integration by @jfmcdowell in #9070
feat(biome_js_analyze): implement noVueRefAsOperand by @taga3s in #9063
perf(parse/tailwind): use lookup_byte for slightly better throughput by @dyc3 in #9183
refactor(core): move js semantic model by @ematipico in #8361
feat(markdown): add prettier tests for markdown formatter by @tidefield in #9076
fix(lint): code action for noRedundantUseStrict no longer produces syntactically invalid nodes by @dyc3 in #9191
chore(deps): update github-actions by @renovate[bot] in #9198
chore(deps): update rust crate anyhow to 1.0.102 by @renovate[bot] in #9200
chore(deps): update rust crate jiff to 0.2.21 by @renovate[bot] in #9201
chore(deps): update pnpm to v10.30.1 by @renovate[bot] in #9204
fix(deps): update @biomejs packages by @renovate[bot] in #9203
chore(deps): update dependency tombi to v0.7.31 by @renovate[bot] in #9199
feat: graphql as valid graphql tag by @JUSTIVE in #9163
ci: reduce workflow triggering to cron schedule by @ematipico in #9207
perf(linter): batch plugins into single visitor with anchor-kind dispatch by @chocky335 in #9184
refactor(markdown): split list item parser by @jfmcdowell in #9167
fix(lint): consider more constructs as valid test assertions by @Bertie690 in #9178
feat(css): scss basic expressions by @denbezrukov in #9212
fix(cli): json reporter by @ematipico in #9221
fix(markdown-parser): promote blockquote prefix markers from skipped trivia to explicit CST nodes by @jfmcdowell in #9219
fix(cli): json reporter file by @ematipico in #9223
feat(css): add SCSS unary and binary expression by @denbezrukov in #9222
fix: redact duration propertly by @ematipico in #9225
feat(css): add scss keyword and arbitrary arguments by @denbezrukov in #9227
feat(lint): add useNullishCoalescing nursery rule by @pkallos in #8952
chore(deps): update rust crate regex to 1.12.3 by @renovate[bot] in #9202
refactor(css): inline function argument expressions by @denbezrukov in #9241
feat(parse/html/svelte): new svelte syntax for comments inside tags by @dyc3 in #9173
fix(js_analyze): mention which dependency the useExhaustiveDependencies fix adds to the list by @Netail in #9243
fix(cli): disable colors when GitHub Actions auto-enables github reporter by @FrederickStempfle in #9215
ci: fix autofix by @ematipico in #9247
refactor(yaml): accept a list of properties by @l0ngvh in #9220
fix(noPlaywrightMissingAwait): fix false positives with jest-dom matchers by @abossenbroek in #9154
feat: prefer-array-some from eslint-plugin-unicorn by @ruidosujeira in #9056
fix(noDuplicateTestHooks): check for options argument by @tim-we in #8934
refactor: use semantic model for module graph by @ematipico in #9211
fix(css/parser): correctly parse container query scroll-state by @ematipico in #9254
perf(rowan): text edits by slicing text by @ematipico in #9252
fix(css/parser): bom parsing by @ematipico in #9259
refactor(markdown-parser): promote pre-marker indent to explicit CST by @jfmcdowell in #9224
refactor(markdown-parser): extract magic numbers to named constants by @jfmcdowell in #9228
fix(analyzer): some rules panicked by @ematipico in #9255
fix(css/formatter): ratio printing by @ematipico in #9251
refactor(markdown-parser): replace remaining magic numbers with named constants by @jfmcdowell in #9264
feat(lint): add nursery rule useNamedCaptureGroup by @ff1451 in #9048
fix(noVueDuplicateKeys): fix false positives when keys are defined in watch by @dyc3 in #9266
refactor(markdown-parser): deduplicate link scan/parse with BumpMode by @jfmcdowell in #9192
feat(lint): add ||= to ??= detection in useNullishCoalescing by @pkallos in #9257
fix(lint): noArrayIndexKey should flag index anywhere in template by @LouisLau-art in #8968
fix(dx): deny type Options = () in rules by @dyc3 in #9281
fix(cli): json reporter escaping by @ematipico in #9256
fix(noUndeclaredVariables): consult embedded bindings service before flagging false positives by @dyc3 in #9269
feat(css): add support for @container scroll-state at-rule and associated queries by @denbezrukov in #9273
feat(lint/html): add useVueScopedStyles by @dyc3 in #9185
chore(deps): update rust:1.93.1-bookworm docker digest to 7c4ae64 by @renovate[bot] in #9289
chore(deps): update rust:1.93.1-bullseye docker digest to fae8ebc by @renovate[bot] in #9290
chore: extra rule source by @Netail in #9294
fix(module_graph): properly index and resolve barrel exports by @ematipico in #9267
fix(css): parse scroll-state and general-enclosed queries by @denbezrukov in #9284
feat(linter): add useUnicodeRegex rule by @xcb3d in #8773
fix(noUndeclaredVariables): fix false positives for functions and variables defined in vue <script setup> components by @dyc3 in #9283
ci: release by @github-actions[bot] in #9188

New Contributors

@JUSTIVE made their first contribution in #9163
@chocky335 made their first contribution in #9184
@pkallos made their first contribution in #8952
@FrederickStempfle made their first contribution in #9215
@xcb3d made their first contribution in #8773

Full Changelog: https://github.com/biomejs/biome/compare/@biomejs/biome@2.4.4...@biomejs/biome@2.4.5

biomejs/biome @biomejs/biome@2.4.5 Biome CLI v2.4.5 on GitHub

2.4.5

Patch Changes

What's Changed

New Contributors

biomejs/biome @biomejs/biome@2.4.5
Biome CLI v2.4.5

on GitHub