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Biome changelog

This project follows Semantic Versioning. Due to the nature of Biome as a toolchain, it can be unclear what changes are considered major, minor, or patch. Read our guidelines to categorize a change.

New entries must be placed in a section entitled Unreleased. Read our guidelines for writing a good changelog entry.

Unreleased

Analyzer

CLI

Bug fixes

  • Fix the command format, now it returns a non-zero exit code when if there pending diffs. Contributed by @ematipico

Configuration

Editors

Formatter

JavaScript APIs

Linter

Bug fixes

  • Fix #639 by ignoring unused TypeScript's mapped key. Contributed by @Conaclos

  • Fix #565 by handling several infer with the same name in extends clauses of TypeScript's conditional types. Contributed by @Conaclos

  • Fix #653. noUnusedImports now correctly removes the entire line where the unused import is. Contributed by @Conaclos

Parser

VSCode

1.3.3 (2023-10-31)

Analyzer

Bug fixes

  • Fix #604 which made noConfusingVoidType report false positives when the void type is used in a generic type parameter. Contributed by @unvalley

CLI

Bug fixes

  • Fix how overrides behave. Now ignore and include apply or not the override pattern, so they override each other. Now the options inside overrides override the top-level options.
  • Bootstrap the logger only when needed. Contributed by @ematipico

Editors

Bug fixes

  • Fix #592, by changing binary resolution in the IntelliJ plugin. Contributed by @Joshuabaker2

Formatter

Bug fixes

  • Apply the correct layout when the right hand of an assignment expression is a await expression or a yield expression. Contributed by @ematipico
  • Fix #303, where nested arrow functions didn't break. Contributed by @victor-teles

Linter

Bug fixes

  • Fix #175 which made noRedeclare report index signatures using the name of a variable in the parent scope.

  • Fix #557 which made noUnusedImports report imported types used in typeof expression. Contributed by @Conaclos

  • Fix #576 by removing some erroneous logic in noSelfAssign. Contributed by @ematipico

  • Fix #595 by updating unsafe-apply logic to avoid unexpected errors in noUselessFragments. Contributed by @nissy-dev

  • Fix #591 which made noRedeclare report type parameters with identical names but in different method signatures. Contributed by @Conaclos

  • Support more a11y roles and fix some methods for a11y lint rules Contributed @nissy-dev

  • Fix useExhaustiveDependencies, by removing useContext, useId and useSyncExternalStore from the known hooks. Contributed by @msdlisper

Parser

Enhancements

  • Support RegExp v flag. Contributed by @nissy-dev
  • Improve error messages. Contributed by @ematipico

1.3.1 (2023-10-20)

CLI

Bug fixes

  • Fix rage command, now it doesn't print info about running servers. Contributed by @ematipico

Editors

Bug fixes

  • Fix #552, where the formatter isn't correctly triggered in Windows systems. Contributed by @victor-teles

Linter

New features

Bug fixes

1.3.0 (2023-10-19)

Analyzer

Enhancements

  • Import sorting is safe to apply now, and it will be applied when running check --apply instead of check --apply-unsafe.

  • Import sorting now handles Bun imports bun:<name>, absolute path imports /<path>, and Node's subpath imports #<name>. See our documentation for more details. Contributed by @Conaclos

CLI

Bug fixes

  • Fix #319. The command biome lint now shows the correct options. Contributed by @ematipico
  • Fix #312. Running biome --version now exits with status code 0 instead of 1. Contributed by @nhedger
  • Fix a bug where the extends functionality doesn't carry over organizeImports.ignore. Contributed by @ematipico
  • The CLI now returns the original content when using stdin and the original content doesn't change. Contributed by @ematipico

New features

  • Add support for BIOME_BINARY environment variable to override the location of the binary. Contributed by @ematipico

  • Add option --indent-width, and deprecated the option --indent-size. Contributed by @ematipico

  • Add option --javascript-formatter-indent-width, and deprecated the option --javascript-formatter-indent-size. Contributed by @ematipico

  • Add option --json-formatter-indent-width, and deprecated the option --json-formatter-indent-size. Contributed by @ematipico

  • Add option --daemon-logs to biome rage. The option is required to view Biome daemon server logs. Contributed by @unvalley

  • Add support for logging. By default, Biome doesn't log anything other than diagnostics. Logging can be enabled with the new option --log-level:

    biome format --log-level=info ./src

    There are four different levels of logging, from the most verbose to the least verbose: debug, info, warn and error. Here's how an INFO log will look like:

    2023-10-05T08:27:01.954727Z  INFO  Analyze file ./website/src/playground/components/Resizable.tsx
  at crates/biome_service/src/file_handlers/javascript.rs:298 on biome::worker_5
  in Pulling diagnostics with categories: RuleCategories(SYNTAX)
  in Processes formatting with path: "./website/src/playground/components/Resizable.tsx"
  in Process check with path: "./website/src/playground/components/Resizable.tsx"

    You can customize how the log will look like with a new option --log-kind. The supported kinds are: pretty, compact and json.

    pretty is the default logging. Here's how a compact log will look like:

    2023-10-05T08:29:04.864247Z  INFO biome::worker_2 Process check:Processes linting:Pulling diagnostics: crates/biome_service/src/file_handlers/javascript.rs: Analyze file ./website/src/playground/components/Resizable.tsx path="./website/src/playground/components/Resizable.tsx" path="./website/src/playground/components/Resizable.tsx" categories=RuleCategories(LINT)
2023-10-05T08:29:04.864290Z  INFO biome::worker_7 Process check:Processes formatting: crates/biome_service/src/file_handlers/javascript.rs: Format file ./website/src/playground/components/Tabs.tsx path="./website/src/playground/components/Tabs.tsx" path="./website/src/playground/components/Tabs.tsx"
2023-10-05T08:29:04.879332Z  INFO biome::worker_2 Process check:Processes formatting:Pulling diagnostics: crates/biome_service/src/file_handlers/javascript.rs: Analyze file ./website/src/playground/components/Resizable.tsx path="./website/src/playground/components/Resizable.tsx" path="./website/src/playground/components/Resizable.tsx" categories=RuleCategories(SYNTAX)
2023-10-05T08:29:04.879383Z  INFO biome::worker_2 Process check:Processes formatting: crates/biome_service/src/file_handlers/javascript.rs: Format file ./website/src/playground/components/Resizable.tsx path="./website/src/playground/components/Resizable.tsx" path="./website/src/playground/components/Resizable.tsx"

Enhancements

  • Deprecated the environment variable ROME_BINARY. Use BIOME_BINARY instead. Contributed by @ematipico
  • Biome doesn't check anymore the presence of the .git folder when VCS support is enabled. Contributed by @ematipico
  • biome rage doesn't print the logs of the daemon, use biome rage --daemon-logs to print them. Contributed by @unvalley

Configuration

New features

  • Add option formatter.indentWidth, and deprecated the option formatter.indentSize. Contributed by @ematipico

  • Add option javascript.formatter.indentWidth, and deprecated the option javascript.formatter.indentSize. Contributed by @ematipico

  • Add option json.formatter.indentWidth, and deprecated the option json.formatter.indentSize. Contributed by @ematipico

  • Add option include to multiple sections of the configuration

    • files.include;
    • formatter.include;
    • linter.include;
    • organizeImports.include; When include and ignore are both specified, ignore takes precedence over include

  • Add option overrides, where users can modify the behaviour of the tools for certain files or paths.

    For example, it's possible to modify the formatter lineWidth, and even quoteStyle for certain files that are included in glob path generated/**:

    {
  "formatter": {
    "lineWidth": 100
  },
  "overrides": [
    {
      "include": ["generated/**"],
      "formatter": {
        "lineWidth": 160
      },
      "javascript": {
        "formatter": {
          "quoteStyle": "single"
        }
      }
    }
  ]
}

    Or, you can disable certain rules for certain path, and disable the linter for other paths:

    {
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true
    }
  },
  "overrides": [
    {
      "include": ["lib/**"],
      "linter": {
        "rules": {
          "suspicious": {
            "noDebugger": "off"
          }
        }
      }
    },
    {
      "include": ["shims/**"],
      "linter": {
        "enabled": false
      }
    }
  ]
}

Bug fixes

  • Fix #343, extends was incorrectly applied to the biome.json file. Contributed by @ematipico

Editors

Bug fixes

  • Fix #404. Biome intellij plugin now works on Windows. Contributed by @victor-teles

  • Fix #402. Biome format on intellij plugin now recognize biome.json. Contributed by @victor-teles

Formatter

Enhancements

  • Use OnceCell for the Memoized memory because that's what the RefCell<Option> implemented. Contributed by @denbezrukov

Linter

Promoted rules

The following rules are now recommended:

New features

  • Add noEmptyCharacterClassInRegex rule. The rule reports empty character classes and empty negated character classes in regular expression literals. Contributed by @Conaclos

  • Add noMisleadingInstantiator rule. The rule reports the misleading use of the new and constructor methods. Contributed by @unvalley

  • Add noUselessElse rule. The rule reports else clauses that can be omitted because their if branches break. Contributed by @Conaclos

  • Add noUnusedImports rule. The rule reports unused imports and suggests to remove them. Contributed by @Conaclos

    noUnusedVariables reports also unused imports, but don't suggest their removal. Once noUnusedImports stabilized, noUnusedVariables will not report unused imports.

  • Add useShorthandAssign rule. The rule enforce use of shorthand operators that combine variable assignment and some simple mathematical operations. For example, x = x + 4 can be shortened to x += 4. Contributed by @victor-teles

  • Add useAsConstAssertion rule. The rule enforce use of as const assertion to infer literal types. Contributed by @unvalley

  • Add noMisrefactoredShorthandAssign rule. The rule reports shorthand assigns when variable appears on both sides. For example x += x + b Contributed by @victor-teles

  • Add noApproximativeNumericConstant rule. Contributed by @nikeee

  • Add noInteractiveElementToNoninteractiveRole rule. The rule enforces the non-interactive ARIA roles are not assigned to interactive HTML elements. Contributed by @nissy-dev

  • Add useAriaActivedescendantWithTabindex rule. The rule enforces that tabIndex is assigned to non-interactive HTML elements with aria-activedescendant. Contributed by @nissy-dev

  • Add noUselessLoneBlockStatements rule. The rule reports standalone blocks that don't include any lexical scoped declaration. Contributed by @emab

  • Add noInvalidNewBuiltin rule. The rule reports use of new on Symbol and BigInt. Contributed by @lucasweng

Enhancements

Bug fixes

  • Fix #294. noConfusingVoidType no longer reports false positives for return types. Contributed by @b4s36t4

  • Fix #313. noRedundantUseStrict now keeps leading comments.

  • Fix #383. noMultipleSpacesInRegularExpressionLiterals now provides correct code fixes when consecutive spaces are followed by a quantifier. Contributed by @Conaclos

  • Fix #397. useNumericLiterals now provides correct code fixes for signed numbers. Contributed by @Conaclos

  • Fix 452. The linter panicked when it met a malformed regex (a regex not ending with a slash).

  • Fix #104. We now correctly handle types and values with the same name.

  • Fix #243 a false positive case where the incorrect scope was defined for the infer type. in rule noUndeclaredVariables. Contributed by @denbezrukov

  • Fix #322, now noSelfAssign correctly handles literals inside call expressions.

  • Changed how noSelfAssign behaves. The rule is not triggered anymore on function calls. Contributed by @ematipico

Parser

  • Enhance diagnostic for infer type handling in the parser. The 'infer' keyword can only be utilized within the 'extends' clause of a conditional type. Using it outside of this context will result in an error. Ensure that any type declarations using 'infer' are correctly placed within the conditional type structure to avoid parsing issues. Contributed by @denbezrukov

  • Add support for parsing trailing commas inside JSON files:

    {
  "json": {
    "parser": {
      "allowTrailingCommas": true
    }
  }
}

    Contributed by @nissy-dev

VSCode

1.2.2 (2023-09-16)

CLI

Bug fixes

  • Fix a condition where import sorting wasn't applied when running biome check --apply

1.2.1 (2023-09-15)

Configuration

  • Fix an edge case where the formatter language configuration wasn't picked.
  • Fix the configuration schema, where json.formatter properties weren't transformed in camel case.

1.2.0 (2023-09-15)

CLI

New features

  • Add new options to customize the behaviour the formatter based on the language of the file
    • --json-formatter-enabled
    • --json-formatter-indent-style
    • --json-formatter-indent-size
    • --json-formatter-line-width
    • --javascript-formatter-enabled
    • --javascript-formatter-indent-style
    • --javascript-formatter-indent-size
    • --javascript-formatter-line-width

Bug fixes

  • Fix a bug where --errors-on-warning didn't work when running biome ci command.

Configuration

New features

  • Add new options to customize the behaviour of the formatter based on the language of the file
    • json.formatter.enabled
    • json.formatter.indentStyle
    • json.formatter.indentSize
    • json.formatter.lineWidth
    • javascript.formatter.enabled
    • javascript.formatter.indentStyle
    • javascript.formatter.indentSize
    • javascript.formatter.lineWidth

Linter

Promoted rules

New rules are incubated in the nursery group. Once stable, we promote them to a stable group. The following rules are promoted:

New rules

  • Add noConfusingVoidType rule. The rule reports the unusual use of the void type. Contributed by @shulandmimi

Removed rules

  • Remove noConfusingArrow.

    Code formatters, such as prettier and Biome, always adds parentheses around the parameter or the body of an arrow function. This makes the rule useless.

    Contributed by @Conaclos

Enhancements

  • noFallthroughSwitchClause now relies on control flow analysis to report most of switch clause fallthrough. Contributed by @Conaclos

  • noAssignInExpressions no longer suggest code fixes. Most of the time the suggestion didn't match users' expectations. Contributed by @Conaclos

  • noUselessConstructor no longer emits safe code fixes. Contributed by @Conaclos

    All code fixes are now emitted as unsafe code fixes. Removing a constructor can change the behavior of a program.

  • useCollapsedElseIf now only provides safe code fixes. Contributed by @Conaclos

  • noUnusedVariables now reports more cases.

    The rule is now able to ignore self-writes. For example, the rule reports the following unused variable:

    let a = 0;
a++;
a += 1;

    The rule is also capable of detecting an unused declaration that uses itself. For example, the rule reports the following unused interface:

    interface I {
  instance(): I
}

    Finally, the rule now ignores all TypeScript declaration files, including global declaration files.

    Contributed by @Conaclos

Bug fixes

  • Fix #182, making useLiteralKeys retains optional chaining. Contributed by @denbezrukov

  • Fix #168, fix useExhaustiveDependencies false positive case when stable hook is on a new line. Contributed by @denbezrukov

  • Fix #137, fix noRedeclare false positive case with TypeScript module declaration:

    declare module '*.gif' {
    const src: string;
}

declare module '*.bmp' {
    const src: string;
}

    Contributed by @denbezrukov

  • Fix #258, fix noUselessFragments the case where the rule removing an assignment. Contributed by @denbezrukov

  • Fix #266, where complexity/useLiteralKeys emitted a code action with an invalid AST. Contributed by @ematipico

  • Fix #105, removing false positives reported by noUnusedVariables.

    The rule no longer reports the following used variable:

    const a = f(() => a);

    Contributed by @Conaclos

VSCode

Enhancements

  • Improve server binary resolution when using certain package managers, notably pnpm.

    The new strategy is to point to node_modules/.bin/biome path, which is consistent for all package managers.

1.1.2 (2023-09-07)

Editors

Bug fixes

  • Fix a case where an empty JSON file would cause the LSP server to crash. Contributed by @ematipico

Linter

Enhancements

  • useNamingConvention now accepts import namespaces in PascalCase and rejects export namespaces in CONSTANT_CASE.

    The following code is now valid:

    import * as React from "react";

    And the following code is now invalid:

    export * as MY_NAMESPACE from "./lib.js";

    Contributed by @Conaclos

  • noUselessConstructor now ignores decorated classes and decorated parameters. The rule now gives suggestions instead of safe fixes when parameters are annotated with types. Contributed by @Conaclos

1.1.1 (2023-09-07)

Analyzer

Bug fixes

  • The diagnostic for // rome-ignore suppression comment should not be a warning. A warning could block the CI, marking a gradual migration difficult. The code action that changes // rome-ignore to // biome-ignore is disabled as consequence. Contributed by @ematipico

1.1.0 (2023-09-06)

Analyzer

Enhancements

  • Add a code action to replace rome-ignore with biome-ignore. Use biome check --apply-unsafe to update all the comments. The action is not bulletproof, and it might generate unwanted code, that's why it's unsafe action. Contributed by @ematipico

CLI

Enhancements

  • Biome now reports a diagnostics when a rome.json file is found.
  • biome migrate --write creates biome.json from rome.json, but it won't delete the rome.json file. Contributed by @ematipico

Bug fixes

  • Biome uses biome.json first, then it attempts to use rome.json.
  • Fix a case where Biome couldn't compute correctly the ignored files when the VSC integration is enabled. Contributed by @ematipico

Configuration

Editors

Bug fixes

  • The LSP now uses its own socket and won't rely on Biome's socket. This fixes some cases where users were seeing multiple servers in the rage output.

Formatter

Enhancements

  • You can use // biome-ignore as suppression comment.
  • The // rome-ignore suppression is deprecated.

JavaScript APIs

Linter

New features

  • Add useCollapsedElseIf rule. This new rule requires merging an else and an if, if the if statement is the only statement in the else block. Contributed by @n-gude

Enhancements

  • useTemplate now reports all string concatenations.

    Previously, the rule ignored concatenation of a value and a newline or a backquote. For example, the following concatenation was not reported:

    v + "\n";
"`" + v + "`";

    The rule now reports these cases and suggests the following code fixes:

    - v + "\n";
+ `${v}\n`;
- v + "`";
+ `\`${v}\``;

    Contributed by @Conaclos

  • useExponentiationOperator suggests better code fixes.

    The rule now preserves any comment preceding the exponent, and it preserves any parenthesis around the base or the exponent. It also adds spaces around the exponentiation operator **, and always adds parentheses for pre- and post-updates.

    - Math.pow(a++, /**/ (2))
+ (a++) ** /**/ (2)

    Contributed by @Conaclos

  • You can use // biome-ignore as suppression comment.

  • The // rome-ignore suppression is deprecated.

Bug fixes

  • Fix #80, making noDuplicateJsxProps case-insensitive.

    Some frameworks, such as Material UI, rely on the case-sensitivity of JSX properties. For example, TextField has two properties with the same name, but distinct cases:

    <TextField inputLabelProps="" InputLabelProps=""></TextField>

    Contributed by @Conaclos

  • Fix #138

    noCommaOperator now correctly ignores all use of comma operators inside the update part of a for loop. The following code is now correctly ignored:

    for (
  let i = 0, j = 1, k = 2;
  i < 100;
  i++, j++, k++
) {}

    Contributed by @Conaclos

  • Fix rome#4713.

    Previously, useTemplate made the following suggestion:

    - a + b + "px"
+ `${a}${b}px`

    This breaks code where a and b are numbers.

    Now, the rule makes the following suggestion:

    - a + b + "px"
+ `${a + b}px`

    Contributed by @Conaclos

  • Fix rome#4109

    Previously, useTemplate suggested an invalid code fix when a leading or trailing single-line comment was present:

      // leading comment
- 1 /* inner comment */ + "+" + 2 // trailing comment
+ `${// leading comment
+ 1 /* inner comment */}+${2 //trailing comment}` // trailing comment

    Now, the rule correctly handle this case:

      // leading comment
- 1 + "+" + 2 // trailing comment
+ `${1}+${2}` // trailing comment

    As a sideeffect, the rule also suggests the removal of any inner comments.

    Contributed by @Conaclos

  • Fix rome#3850

    Previously useExponentiationOperator suggested invalid code in a specific edge case:

    - 1 +Math.pow(++a, 2)
+ 1 +++a**2

    Now, the rule properly adds parentheses:

    - 1 +Math.pow(++a, 2)
+ 1 +(++a) ** 2

    Contributed by @Conaclos

  • Fix #106

    noUndeclaredVariables now correctly recognizes some TypeScript types such as Uppercase.

    Contributed by @Conaclos

  • Fix rome#4616

    Previously noUnreachableSuper reported valid codes with complex nesting of control flow structures.

    Contributed by @Conaclos

1.0.0 (2023-08-28)

Analyzer

BREAKING CHANGES

  • The organize imports feature now groups import statements by "distance".

    Modules "farther" from the user are put on the top, and modules "closer" to the user are placed on the bottom. Check the documentation for more information about it.

  • The organize imports tool is enabled by default. If you don't want to use it, you need to disable it explicitly:

    {
  "organizeImports": {
    "enabled": false
  }
}

CLI

BREAKING CHANGES

  • The CLI now exists with an error when there's an error inside the configuration.

    Previously, biome would raise warnings and continue the execution by applying its defaults.

    This could have been better for users because this could have created false positives in linting or formatted code with a configuration that wasn't the user's.

  • The command biome check now shows formatter diagnostics when checking the code.

    The diagnostics presence will result in an error code when the command finishes.

    This aligns with semantic and behaviour meant for the command biome check.

  • init command emits a biome.json file;

Other changes

  • Fix #4670, don't crash at empty default export.

  • Fix #4556, which correctly handles new lines in the .gitignore file across OS.

  • Add a new option to ignore unknown files --files-ignore-unknown:

    biome format --files-ignore-unknown ./src

    Doing so, Biome won't emit diagnostics for files that doesn't know how to handle.

  • Add the new option --no-errors-on-unmatched:

    biome format --no-errors-on-unmatched ./src

    Biome doesn't exit with an error code if no files were processed in the given paths.

  • Fix the diagnostics emitted when running the biome format command.

  • Biome no longer warns when discovering (possibly infinite) symbolic links between directories.

    This fixes #4193 which resulted in incorrect warnings when a single file or directory was pointed at by multiple symbolic links. Symbolic links to other symbolic links do still trigger warnings if they are too deeply nested.

  • Introduced a new command called biome lint, which will only run lint rules against the code base.

  • Biome recognises known files as "JSON files with comments allowed":

    • typescript.json;
    • tsconfig.json;
    • jsconfig.json;
    • tslint.json;
    • babel.config.json;
    • .babelrc.json;
    • .ember-cli;
    • typedoc.json;
    • .eslintrc.json;
    • .eslintrc;
    • .jsfmtrc;
    • .jshintrc;
    • .swcrc;
    • .hintrc;
    • .babelrc;

  • Add support for biome.json;

Configuration

Other changes

  • Add a new option to ignore unknown files:

    {
   "files": {
      "ignoreUnknown": true
   }
}

    Doing so, Biome won't emit diagnostics for file that it doesn't know how to handle.

  • Add a new "javascript" option to support the unsafe/experimental parameter decorators:

    {
   "javascript": {
      "parser": {
         "unsafeParameterDecoratorsEnabled": true
      }
   }
}

  • Add a new "extends" option, useful to split the configuration file in multiple files:

    {
  "extends": ["../sharedFormatter.json", "linter.json"]
}

    The resolution of the files is file system based, Biome doesn't know how to resolve dependencies yet.

  • The commands biome check and biome lint now show the remaining diagnostics even when --apply-safe or --apply-unsafe are passed.

  • Fix the commands biome check and biome lint, they won't exit with an error code if no error diagnostics are emitted.

  • Add a new option --error-on-warnings, which instructs Biome to exit with an error code when warnings are emitted.

    biome check --error-on-wanrings ./src

  • Add a configuration to enable parsing comments inside JSON files:

    {
  "json": {
    "parser": {
      "allowComments": true
    }
  }
}

Editors

Other changes

  • The Biome LSP can now show diagnostics belonging to JSON lint rules.

  • The Biome LSP no longer applies unsafe quickfixes on-save when editor.codeActionsOnSave.quifix.biome is enabled.

  • Fix #4564; files too large don't emit errors.

  • The Biome LSP sends client messages when files are ignored or too big.

Formatter

  • Add a new option called --jsx-quote-style.

    This option lets you choose between single and double quotes for JSX attributes.

  • Add the option --arrow-parentheses.

    This option allows setting the parentheses style for arrow functions.

  • The JSON formatter can now format .json files with comments.

Linter

Removed rules

  • Remove complexity/noExtraSemicolon (#4553)

    The Biome formatter takes care of removing extra semicolons. Thus, there is no need for this rule.

  • Remove useCamelCase

    Use useNamingConvention instead.

New rules

Promoted rules

New rules are promoted, please check #4750 for more details:

The following rules are now recommended:

**- noUselessFragments

Other changes

  • Add new TypeScript globals (AsyncDisposable, Awaited, DecoratorContext, and others) 4643.

  • noRedeclare: allow redeclare of index signatures are in different type members #4478

  • Improve noConsoleLog, noGlobalObjectCalls, useIsNan, and useNumericLiterals by handling globalThis and window namespaces.

    For instance, the following code is now reported by noConsoleLog:

    globalThis.console.log("log")

  • Improve noDuplicateParameters to manage constructor parameters.

  • Improve noInnerDeclarations

    Now, the rule doesn't report false-positives about ambient TypeScript declarations. For example, the following code is no longer reported by the rule:

    declare var foo;

  • Improve useEnumInitializers

    The rule now reports all uninitialized members of an enum in a single diagnostic.

    Moreover, ambient enum declarations are now ignored. This avoids reporting ambient enum declarations in TypeScript declaration files.

    declare enum Weather {
  Rainy,
  Sunny,
}

  • Relax noBannedTypes and improve documentation

    The rule no longer reports a user type that reuses a banned type name. The following code is now allowed:

    import { Number } from "a-lib";
declare const v: Number;

    The rule now allows the use of the type {} to denote a non-nullable generic type:

    function f<T extends {}>(x: T) {
    assert(x != null);
}

    And in a type intersection for narrowing a type to its non-nullable equivalent type:

    type NonNullableMyType = MyType & {};

  • Improve noConstantCondition

    The rule now allows while(true). This recognizes a common pattern in the web community:

    while (true) {
  if (cond) {
    break;
  }
}

  • Improve the diagnostic and the code action of useDefaultParameterLast.

    The diagnostic now reports the last required parameter which should precede optional and default parameters.

    The code action now removes any whitespace between the parameter name and its initialization.

  • Relax noConfusingArrow

    All arrow functions that enclose its parameter with parenthesis are allowed. Thus, the following snippet no longer trigger the rule:

    var x = (a) => 1 ? 2 : 3;

    The following snippet still triggers the rule:

    var x = a => 1 ? 2 : 3;

  • Relax useLiteralEnumMembers

    Enum members that refer to previous enum members are now allowed. This allows a common pattern in enum flags like in the following example:

    enum FileAccess {
  None = 0,
  Read = 1,
  Write = 1 << 1,
  All = Read | Write,
}

    Arbitrary numeric constant expressions are also allowed:

    enum FileAccess {
  None = 0,
  Read = 2**0,
  Write = 2**1,
  All = Read | Write,
}

  • Improve useLiteralKeys.

    Now, the rule suggests simplifying computed properties to string literal properties:

    {
-  ["1+1"]: 2,
+  "1+1": 2,
}

    It also suggests simplifying string literal properties to static properties:

    {
-  "a": 0,
+  a: 0,
}

    These suggestions are made in object literals, classes, interfaces, and object types.

  • Improve noNewSymbol.

    The rule now handles cases where Symbol is namespaced with the global globalThis or window.

  • The rules useExhaustiveDependencies and useHookAtTopLevel accept a different shape of options

    Old configuration:

    {
  "linter": {
     "rules": {
        "nursery": {
           "useExhaustiveDependencies": {
              "level": "error",
              "options": {
                 "hooks": [
                    ["useMyEffect", 0, 1]
                 ]
              }
           }
        }
     }
  }
}

    New configuration:

    {
  "linter": {
     "rules": {
        "nursery": {
           "useExhaustiveDependencies": {
              "level": "error",
              "options": {
                 "hooks": [
                    {
                       "name": "useMyEffect",
                       "closureIndex": 0,
                       "dependenciesIndex": 1
                    }
                 ]
              }
           }
        }
     }
  }
}

  • noRedundantUseStrict check only 'use strict' directive to resolve false positive diagnostics.

    React introduced new directives, "use client" and "use server". The rule raises false positive errors about these directives.

  • Fix a crash in the NoParameterAssign rule that occurred when there was a bogus binding. #4323

  • Fix useExhaustiveDependencies in the following cases #4330:

    • when the first argument of hooks is a named function
    • inside an export default function
    • for React.use* hooks

  • Fix noInvalidConstructorSuper that erroneously reported generic parents #4624.

  • Fix noDuplicateCase that erroneously reported as equals the strings literals "'" and '"' #4706.

  • Fix NoUnreachableSuper's false positive diagnostics (#4483) caused to nested if statement.

    The rule no longer reports This constructor calls super() in a loop when using nested if statements in a constructor.

  • Fix useHookAtTopLevel's false positive diagnostics (#4637)

    The rule no longer reports false positive diagnostics when accessing properties directly from a hook and calling a hook inside function arguments.

  • Fix noUselessConstructor which erroneously reported constructors with default parameters rome#4781

  • Fix noUselessFragments's panics when running biome check --apply-unsafe (#4637)

    This rule's code action emits an invalid AST, so I fixed using JsxString instead of JsStringLiteral

  • Fix noUndeclaredVariables's false positive diagnostics (#4675)

    The semantic analyzer no longer handles this reference identifier.

  • Fix noUnusedVariables's false positive diagnostics (#4688)

    The semantic analyzer handles ts export declaration clause correctly.

Parser

  • Add support for decorators in class method parameters, example:

    class AppController {
   get(@Param() id) {}
   // ^^^^^^^^ new supported syntax
}

    This syntax is only supported via configuration, because it's a non-standard syntax.

    {
   "javascript": {
      "parser": {
         "unsafeParameterDecoratorsEnabled": true
      }
   }
}

  • Add support for parsing comments inside JSON files:

    {
  "json": {
    "parser": {
      "allowComments": true
    }
  }
}

  • Add support for the new using syntax

    const using = resource.lock();