2.1.4

Patch Changes

• #7121 b9642ab Thanks @ arendjr! - Fixed #7111: Imported symbols using aliases are now correctly recognised.

• #7103 80515ec Thanks @ omasakun! - Fixed #6933 and #6994.

  When the values of private member assignment expressions, increment expressions, etc. are used, those private members are no longer marked as unused.

• #6887 0cc38f5 Thanks @ ptkagori! - Added the noQwikUseVisibleTask rule to Qwik.

  This rule is intended for use in Qwik applications to warn about the use of useVisibleTask$() functions which require careful consideration before use.

  Invalid:

  useVisibleTask$(() => {
    console.log("Component is visible");
  });

  Valid:

  useTask$(() => {
    console.log("Task executed");
  });

• #7084 50ca155 Thanks @ ematipico! - Added the new nursery rule noUnnecessararyConditions, which detects whenever some conditions don't
  change during the life cycle of the program, and truthy or false, hence deemed redundant.

  For example, the following snippets will trigger the rule:

  // Always truthy literal conditions
  if (true) {
    console.log("always runs");
  }

  // Unnecessary condition on constrained string type
  function foo(arg: "bar" | "baz") {
    if (arg) {
      // This check is unnecessary
    }
  }

• #6887 0cc38f5 Thanks @ ptkagori! - Added the useImageSize rule to Biome.

  The useImageSize rule enforces the use of width and height attributes on <img> elements for performance reasons. This rule is intended to prevent layout shifts and improve Core Web Vitals by ensuring images have explicit dimensions.

  Invalid:

  <img src="/image.png" />
  <img src="https://example.com/image.png" />
  <img src="/image.png" width="200" />
  <img src="/image.png" height="200" />

  Valid:

  <img width="200" height="600" src="/static/images/portrait-01.webp" />
  <img width="100" height="100" src="https://example.com/image.png" />

• #6887 0cc38f5 Thanks @ ptkagori! - Added the useAnchorHref rule to Biome.

  The useAnchorHref rule enforces the presence of an href attribute on <a> elements in JSX. This rule is intended to ensure that anchor elements are always valid and accessible.

  Invalid:

  <a>Link</a>

  <a target="_blank">External</a>

  Valid:

  <a href="/home">Home</a>

  <a href="https://example.com" target="_blank">
    External
  </a>

• #7100 29fcb05 Thanks @ Jayllyz! - Added the rule noNonNullAssertedOptionalChain.

  This rule prevents the use of non-null assertions (!) immediately after optional chaining expressions (?.). Optional chaining is designed to safely handle nullable values by returning undefined when the chain encounters null or undefined. Using a non-null assertion defeats this purpose and can lead to runtime errors.

  // Invalid - non-null assertion after optional chaining
  obj?.prop!;
  obj?.method()!;
  obj?.[key]!;
  obj?.prop!;

  // Valid - proper optional chaining usage
  obj?.prop;
  obj?.method();
  obj?.prop ?? defaultValue;
  obj!.prop?.method();

• #7129 9f4538a Thanks @ drwpow! - Removed option, combobox, listbox roles from useSemanticElements suggestions

• #7106 236deaa Thanks @ arendjr! - Fixed #6985: Inference of return types no longer mistakenly picks up return types of nested functions.

• #7102 d3118c6 Thanks @ omasakun! - Fixed #7101: noUnusedPrivateClassMembers now handles members declared as part of constructor arguments:

  1. If a class member defined in a constructor argument is only used within the constructor, it removes the private modifier and makes it a plain method argument.
  2. If it is not used at all, it will prefix it with an underscore, similar to noUnusedFunctionParameter.

• #7104 5395297 Thanks @ harxki! - Reverting to prevent regressions around ref handling

• #7143 1a6933a Thanks @ siketyan! - Fixed #6799: The noImportCycles rule now ignores type-only imports if the new ignoreTypes option is enabled (enabled by default).

  [!WARNING]
  Breaking Change: The noImportCycles rule no longer detects import cycles that include one or more type-only imports by default.
  To keep the old behaviour, you can turn off the ignoreTypes option explicitly:

  {
    "linter": {
      "rules": {
        "nursery": {
          "noImportCycles": {
            "options": {
              "ignoreTypes": false
            }
          }
        }
      }
    }
  }

• #7099 6cc84cb Thanks @ arendjr! - Fixed #7062: Biome now correctly considers extended configs when determining the mode for the scanner.

• #6887 0cc38f5 Thanks @ ptkagori! - Added the useQwikClasslist rule to Biome.

  This rule is intended for use in Qwik applications to encourage the use of the built-in class prop (which accepts a string, object, or array) instead of the classnames utility library.

  Invalid:

  <div class={classnames({ active: true, disabled: false })} />

  Valid:

  <div classlist={{ active: true, disabled: false }} />

• #7019 57c15e6 Thanks @ fireairforce! - Added support in the JS parser for import source(a stage3 proposal). The syntax looks like:

  import source foo from "<specifier>";

• #7053 655049e Thanks @ jakeleventhal! - Added the useConsistentTypeDefinitions rule.

  This rule enforces consistent usage of either interface or type for object type definitions in TypeScript.

  The rule accepts an option to specify the preferred style:

  • interface (default): Prefer using interface for object type definitions
  • type: Prefer using type for object type definitions

  Examples:

  // With default option (interface)
  // ❌ Invalid
  type Point = { x: number; y: number };

  // ✅ Valid
  interface Point {
  x: number;
  y: number;
  }

  // With option { style: "type" }
  // ❌ Invalid
  interface Point {
  x: number;
  y: number;
  }

  // ✅ Valid
  type Point = { x: number; y: number };

  The rule will automatically fix simple cases where conversion is straightforward.

What's Changed

• ci: use faster runners on Windows by @ ematipico in #7041
• chore: use own semver parser by @ ematipico in #7061
• docs(analyze): about "Services" by @ dyc3 in #7058
• feat(parse/tailwind): start implementing lexer/parser by @ dyc3 in #6986
• feat(qwik): add few new lint rules by @ ptkagori in #6887
• chore: add Claude sub-agents by @ ematipico in #7066
• feat(format/html): implement suppression comments by @ dyc3 in #5356
• feat: add tailwind domain by @ dyc3 in #6972
• chore(lint): add version to the released rules by @ siketyan in #7087
• chore(deps): update rust:1.88.0 docker digest to af306cf by @ renovate[bot] in #7042
• chore(deps): update rust crate serde_json to 1.0.142 by @ renovate[bot] in #7089
• chore(deps): update @ biomejs packages by @ renovate[bot] in #7091
• chore(deps): update dependency @ types/node to v22.17.0 by @ renovate[bot] in #7092
• chore(deps): update dependency eslint to v9.32.0 by @ renovate[bot] in #7093
• chore(deps): update github-actions by @ renovate[bot] in #7094
• chore(deps): update rust crate tokio to 1.47.1 by @ renovate[bot] in #7096
• feat(analyze/js): added rule for @ typescript-eslint/consistent-type-definitions by @ jakeleventhal in #7053
• fix(core): consider extended configs for scan kind by @ arendjr in #7099
• feat(analyse/js): add noNonNullAssertedOptionalChain rule by @ Jayllyz in #7100
• fix(core): return type inference no longer picks up nested returns by @ arendjr in #7106
• fix(lint/noUnusedPrivateClassMembers): improve member usage check by @ omasakun in #7103
• fix(lint/noUnusedPrivateClassMembers): handle class members declared in constructor parameters correctly by @ omasakun in #7102
• chore: setup autofix.ci workflow by @ arendjr in #7113
• revert: "fix(lint/noUnassignedVariables): handle JSX ref attribute ass… by @ harxki in #7104
• feat(lint): rule noUnnecessaryConditions by @ ematipico in #7084
• chore: add CodeRabbit config by @ arendjr in #7114
• ci: use faster runners on depot by @ siketyan in #7115
• feat(parser): support import source by @ fireairforce in #7019
• chore: apply CodeRabbit nits by @ arendjr in #7116
• fix(core): resolve aliased imports by @ arendjr in #7121
• fix: remove option, combobox, listbox from semantic element suggestions by @ drwpow in #7129
• feat(analyze/js): add noVueDataObjectDeclaration by @ amousa11 in #6574
• feat(lint): add ignoreTypes option to the noImportCycles rule by @ siketyan in #7143
• ci: release by @ github-actions[bot] in #7069

New Contributors

• @ jakeleventhal made their first contribution in #7053
• @ omasakun made their first contribution in #7103
• @ amousa11 made their first contribution in #6574

Full Changelog: https://github.com/biomejs/biome/compare/@ biomejs/[email protected]...@ biomejs/[email protected]

2.1.3

Patch Changes

• #7057 634a667 Thanks @ mdevils! - Added the rule noVueReservedKeys, which prevents the use of reserved Vue keys.

  It prevents the use of Vue reserved keys such as those starting with # @ biomejs/biome (like $el, $data, $props) and keys starting with _` in data properties, which can cause conflicts and unexpected behavior in Vue components.

  Invalid example

  <script>
  export default {
    data: {
      $el: "",
      _foo: "bar",
    },
  };
  </script>

  <script>
  export default {
    computed: {
      $data() {
        return this.someData;
      },
    },
  };
  </script>

  Valid examples

  <script>
  export default {
    data() {
      return {
        message: "Hello Vue!",
        count: 0,
      };
    },
  };
  </script>

  <script>
  export default {
    computed: {
      displayMessage() {
        return this.message;
      },
    },
  };
  </script>

• #6941 734d708 Thanks @ JamBalaya56562! - Added @ eslint-react/no-nested-component-definitions as a rule source for noNestedComponentDefinitions. Now it will get picked up by biome migrate --eslint.

• #6463 0a16d54 Thanks @ JamBalaya56562! - Fixed a website link for the useComponentExportOnlyModules linter rule to point to the correct URL.

• #6944 e53f2fe Thanks @ sterliakov! - Fixed #6910: Biome now ignores type casts and assertions when evaluating numbers for noMagicNumbers rule.

• #6991 476cd55 Thanks @ denbezrukov! - Fixed #6973: Add support for parsing the :active-view-transition-type() pseudo-class

  :active-view-transition-type(first second) {
  }

• #6992 0b1e194 Thanks @ ematipico! - Added a new JSON rule called noQuickfixBiome, which disallow the use of code action quickfix.biome inside code editor settings.

• #6943 249306d Thanks @ JamBalaya56562! - Fixed @ vitest/eslint-plugin source url.

• #6947 4c7ed0f Thanks @ JamBalaya56562! - Fixed ESLint migration for the rule prefer-for from eslint-plugin-solid to Biome's useForComponent.

• #6976 72ebadc Thanks @ siketyan! - Fixed #6692: The rules noUnusedVariables and noUnusedFunctionParameters no longer cause an infinite loop when the suggested name is not applicable (e.g. the suggested name is already declared in the scope).

• #6990 333f5d0 Thanks @ rvanlaarhoven! - Fixed the documentation URL for lint/correctness/noUnknownPseudoClass

• #7000 4021165 Thanks @ harxki! - Fixed #6795: noUnassignedVariables now correctly recognizes variables used in JSX ref attributes.

• #7044 b091ddf Thanks @ ematipico! - Fixed #6622, now the rule useSemanticElements works for JSX self-closing elements too.

• #7014 c4864e8 Thanks @ siketyan! - Fixed #6516: The biome migrate command no longer break the member list with trailing comments.

• #6979 29cb6da Thanks @ unvalley! - Fixed #6767: useSortedClasses now correctly removes leading and trailing whitespace in className.

  Previously, trailing spaces in className were not fully removed.

  // Think we have this code:
  <div <span class="pl...