Releases · biomejs/biome

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.

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.

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.

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

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}\``;
```
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)
```
You can use // biome-ignore as suppression comment.
The // rome-ignore suppression is deprecated.
noUselessConstructor now ignores decorated classes and decorated parameters.
The rule now gives suggestions instead of safe fixes when parameters are annotated with types.

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>
```
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++
) {}
```
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`
```

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.

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
```
Fix #106

noUndeclaredVariables now correctly recognizes some TypeScript types such as Uppercase.
Fix rome#4616

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

What's Changed

blog: mention new features in first migration step by @Vivalldi in #84
fix(website): avatar overlapping with header nav by @lutaok in #82
fix(formatter): respect IndentWidth in IndentStyle::Tab by @magic-akari in #86
fix(lint/useTemplate): preserve leading non-string addition by @Conaclos in #70
fix: update remaining discord links by @Conaclos in #90
docs(CONTRIBUTING): update changelog guidelines by @Conaclos in #91
small typo fix by @jharrell in #94
ci: extract changelog for GitHub release notes by @Conaclos in #92
fix(lint/noDuplicateJsxProps): make the rule case-sensitive by @Conaclos in #100
fix(lint/noUndeclaredVariables): recognize Uppercase by @Conaclos in #109
docs: fix 'performance reason' typo everywhere left by @jrysana in #110
chore: rust 1.72.0 by @ematipico in #111
refactor(website): use starlight by @ematipico in #102
docs(website): fix broken links on getting-started by @vinnyA3 in #117
fix(lint/useTemplate): correctly handle comments by @Conaclos in #114
docs/fix-analyzer-opt-in-reference by @stephwestgarth in #122
refactor(utils): remove utils::to_camel_case by @Conaclos in #123
feat(cli): emit warning when rome.json file is found by @ematipico in #107
fix: docs typo by @akash1412 in #126
fix(website): broken rule links on biome-v1 blog page by @GabenGar in #127
refactor(analyzer): avoid cloning and redundant checks by @Conaclos in #124
fix: restore "nursery end" comment in categories.rs by @unvalley in #130
fix(website/playground): fix missing scroll by @Levieber in #133
fix(docs): a bunch of broken links, not all of them by @ematipico in #142
fix: use biome.json instead by @ematipico in #140
feat: migrate rome.json to biome.json by @ematipico in #144
docs: fix broken links in CONTRIBUTING.md by @nissy-dev in #147
docs: Update README.md by @nissy-dev in #149
fix(lint/useExponentiationOperator): avoid incorrect code fixes by @Conaclos in #121
fix(lint/noUnreachableSuper): handle complex CFG by @Conaclos in #97
fix(lint/noCommaOperator): ignore update part of for loops by @Conaclos in #152
fix: support deno by @zuisong in #151
fix: support deno by @zuisong in #153
fix(cli): correctly compute ignored files by @ematipico in #150
refactor(lint/noUselessConstructor): reduce false positives by @Conaclos in #158
feat: biome-ignore as suppression comment by @ematipico in #163
ci: run action only from own branches by @ematipico in #167
feat(lint): useCollapsedElseIf by @n-gude in #160
feat: create action for replacing outdated suppression comments by @ematipico in #166
release: 1.1.0 by @ematipico in #155