@biomejs/biome

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 handles 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