feat(js_analyze): implement noFloatingClasses#8754
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WalkthroughAdds a new JavaScript lint rule Suggested reviewers
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🤖 Fix all issues with AI agents
In @crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs:
- Around line 70-72: Change the plural "operators" to the singular "operator" in
the diagnostic message string generated by markup! in no_floating_classes (the
`"Using the 'new' operators outside of assignments or comparisons is not
allowed."` string) so it reads `"Using the 'new' operator outside of assignments
or comparisons is not allowed."`.
🧹 Nitpick comments (1)
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js (1)
1-2: Consider expanding test coverage.The single test case is correct, but you might want to add more invalid scenarios to strengthen coverage:
/* should generate diagnostics */ new Date() new Array(1, 2, 3) new Object() new MyClass()This ensures the rule catches various constructor types, not just built-ins.
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⛔ Files ignored due to path filters (7)
crates/biome_configuration/src/analyzer/linter/rules.rsis excluded by!**/rules.rsand included by**crates/biome_diagnostics_categories/src/categories.rsis excluded by!**/categories.rsand included by**crates/biome_js_analyze/src/lint/nursery.rsis excluded by!**/nursery.rsand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js.snapis excluded by!**/*.snapand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js.snapis excluded by!**/*.snapand included by**packages/@biomejs/backend-jsonrpc/src/workspace.tsis excluded by!**/backend-jsonrpc/src/workspace.tsand included by**packages/@biomejs/biome/configuration_schema.jsonis excluded by!**/configuration_schema.jsonand included by**
📒 Files selected for processing (6)
.changeset/wild-times-design.mdcrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.jscrates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
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**/*.rs
📄 CodeRabbit inference engine (CONTRIBUTING.md)
**/*.rs: Use inline rustdoc documentation for rules, assists, and their options
Use thedbg!()macro for debugging output in Rust tests and code
Use doc tests (doctest) format with code blocks in rustdoc comments; ensure assertions pass in tests
Files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rscrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
🧠 Learnings (30)
📓 Common learnings
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Rule options must be defined in the `biome_rule_options` crate with a file named after the rule
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Apply `#[serde(deny_unknown_fields)]` to rule option structs to enforce strict configuration validation
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : New rules must be placed inside the `nursery` group before promotion to other groups
Applied to files:
crates/biome_rule_options/src/lib.rs.changeset/wild-times-design.mdcrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Use `Option<_>` wrapper for rule option fields to enable proper merging of configurations
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rscrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Rule option types must derive `Deserializable`, `Serialize`, `Deserialize`, and optionally `JsonSchema` traits
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Apply `#[serde(rename_all = "camelCase")]` to rule option structs to match JSON configuration naming convention
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2025-11-24T18:05:42.356Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.356Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : No module may copy or clone data from another module in the module graph, not even behind an `Arc`
Applied to files:
crates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Implement `biome_deserialize::Merge` for rule option types to define how shared and user configurations are merged
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `declare_lint_rule!` macro with a `version` field set to `next` for new rules
Applied to files:
crates/biome_rule_options/src/lib.rscrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/* : Create test files with `invalid` and `valid` prefixes to represent code that should and should not trigger the rule
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js
📚 Learning: 2025-12-04T13:29:49.287Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8291
File: crates/biome_html_formatter/tests/specs/prettier/vue/html-vue/elastic-header.html:10-10
Timestamp: 2025-12-04T13:29:49.287Z
Learning: Files under `crates/biome_html_formatter/tests/specs/prettier` are test fixtures synced from Prettier and should not receive detailed code quality reviews (e.g., HTTP vs HTTPS, formatting suggestions, etc.). These files are test data meant to validate formatter behavior and should be preserved as-is.
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/*.jsonc : Use `.jsonc` format for test files containing multiple code snippets, where each snippet is a string in an array
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For rule changes in changesets, clearly demonstrate what is now invalid that wasn't before, or vice versa
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new nursery rules, send PRs to the maintenance branch `main`
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: In changesets, reference rules and assists with links to the website documentation
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: Changesets should describe user-facing changes only; internal refactoring without behavior changes does not require a changeset
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-11-21T01:10:53.059Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8171
File: crates/biome_js_analyze/src/lint/nursery/no_leaked_render.rs:125-137
Timestamp: 2025-11-21T01:10:53.059Z
Learning: In the Biome codebase, each lint rule has its own options type declaration (e.g., `type Options = RuleNameOptions`) as part of the codegen process, even if the options struct is empty or unused. This is standard practice and should not be flagged as an issue.
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Deprecated rules must include a `deprecated` field in the `declare_lint_rule!` macro with an explanation of what rule to use instead
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2025-12-22T09:26:56.943Z
Learnt from: ematipico
Repo: biomejs/biome PR: 8537
File: crates/biome_js_analyze/src/lint/nursery/no_leaked_render.rs:167-210
Timestamp: 2025-12-22T09:26:56.943Z
Learning: When defining lint rules (declare_lint_rule!), only specify fix_kind if the rule implements an action(...) function. Rules that only emit diagnostics without a code fix should omit fix_kind. This applies to all Rust lint rule definitions under crates/.../src/lint (e.g., crates/biome_js_analyze/src/lint/...).
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `use` prefix when the rule's sole intention is to mandate a single concept
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Invalid code snippets in rule documentation must emit exactly one diagnostic
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Mark rules with `issue_number` in the `declare_lint_rule!` macro if they are work-in-progress to indicate missing features
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2025-12-31T15:35:32.899Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8639
File: crates/biome_js_analyze/src/lint/nursery/no_excessive_lines_per_file.rs:101-108
Timestamp: 2025-12-31T15:35:32.899Z
Learning: In Rust lint rules under the nursery category, the issue_number field in declare_lint_rule! is optional and should not be added unless there is a compelling reason. In code reviews, verify that no unnecessary issue_number is included in nursery lint declarations. Only add issue_number if there is an explicit, justified reason (e.g., tracked issue for external observers). This guidance broadly applies to all nursery lint rule files, not just the single file.
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Implement custom `Queryable` and `Visitor` types for rules that require deep inspection of child nodes to avoid inefficient traversals
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Code blocks in rule documentation must specify a language identifier and be tagged with `expect_diagnostic` for invalid examples or remain untagged for valid examples
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `rule_category!()` macro to refer to the diagnostic category instead of dynamically parsing its string name
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Check if a variable is global using the semantic model before reporting diagnostics for rules that ban global functions or variables
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
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- GitHub Check: Test Node.js API
- GitHub Check: autofix
- GitHub Check: Bench (biome_js_analyze)
- GitHub Check: Check JS Files
- GitHub Check: Validate rules documentation
- GitHub Check: Bench (biome_js_parser)
- GitHub Check: Bench (biome_js_formatter)
- GitHub Check: Test (depot-windows-2022-16)
- GitHub Check: Lint project (depot-ubuntu-24.04-arm-16)
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🔇 Additional comments (8)
.changeset/wild-times-design.md (1)
1-11: LGTM!The changeset follows the guidelines: it includes a link to the documentation, describes the user-facing change, and demonstrates an invalid case with the
new Date();example. Well done.crates/biome_rule_options/src/no_floating_classes.rs (1)
1-6: LGTM!The options struct follows all the required patterns from the coding guidelines: proper derives (
Deserializable,Serialize,Deserialize,Merge), serde attributes (rename_all,deny_unknown_fields,default), and conditionalJsonSchemaderivation.crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js (1)
1-7: LGTM!Good coverage of the two main valid scenarios: assignment (
var a = new Date()) and comparison (a === new Date()). These align with the rule's purpose of allowingnewwhen its result is actually used.crates/biome_rule_options/src/lib.rs (1)
100-100: No action needed—this module addition follows the proper codegen workflow. Theregister_analyzer_rule_options()function inxtask/codegen/src/generate_analyzer_rule_options.rsintentionally appends the module tolib.rs, with configuration codegen subsequently regenerating the file in alphabetical order. The alphabetical placement confirms the full codegen cycle has run.crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs (4)
1-5: LGTM!Imports are appropriate for the rule implementation. Good use of
biome_rowan::SyntaxNodeOptionExtfor the.kind()method on the parent node.
7-44: LGTM!Rule declaration follows all conventions:
version: "next"for new nursery rules ✓"no"prefix for a rule that forbids a concept ✓recommended: falseappropriate for nursery ✓- Documentation with
expect_diagnosticfor invalid examples ✓- No
fix_kindsince there's noactionmethod ✓Based on learnings, this is spot-on.
52-62: LGTM!The logic correctly identifies "floating"
newexpressions by checking if the parent is aJS_EXPRESSION_STATEMENT. Whennew Thing()stands alone as a statement, its result is indeed discarded.
46-50: This is correct—empty options structs are the standard pattern in Biome. Every rule gets its own options type as part of the codegen process, even if unused. No changes needed.
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🧹 Nitpick comments (2)
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js (1)
1-2: Consider expanding test coverage.The basic case is valid, but you might want to add a few more invalid scenarios to strengthen coverage—e.g.,
new Map();,new CustomClass();, or nested expressions like(new Date());.crates/biome_rule_options/src/no_floating_classes.rs (1)
1-6: Add rustdoc documentation for the options struct.Per coding guidelines, rule options should have inline rustdoc documentation. Even for an empty struct, a brief doc comment helps with discoverability.
📝 Suggested addition
use biome_deserialize_macros::{Deserializable, Merge}; use serde::{Deserialize, Serialize}; + +/// Options for the `noFloatingClasses` rule. #[derive(Default, Clone, Debug, Deserialize, Deserializable, Merge, Eq, PartialEq, Serialize)] #[cfg_attr(feature = "schema", derive(schemars::JsonSchema))] #[serde(rename_all = "camelCase", deny_unknown_fields, default)] pub struct NoFloatingClassesOptions {}
📜 Review details
Configuration used: Path: .coderabbit.yaml
Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (7)
crates/biome_configuration/src/analyzer/linter/rules.rsis excluded by!**/rules.rsand included by**crates/biome_diagnostics_categories/src/categories.rsis excluded by!**/categories.rsand included by**crates/biome_js_analyze/src/lint/nursery.rsis excluded by!**/nursery.rsand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js.snapis excluded by!**/*.snapand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js.snapis excluded by!**/*.snapand included by**packages/@biomejs/backend-jsonrpc/src/workspace.tsis excluded by!**/backend-jsonrpc/src/workspace.tsand included by**packages/@biomejs/biome/configuration_schema.jsonis excluded by!**/configuration_schema.jsonand included by**
📒 Files selected for processing (6)
.changeset/wild-times-design.mdcrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.jscrates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
🚧 Files skipped from review as they are similar to previous changes (2)
- crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
- crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js
🧰 Additional context used
📓 Path-based instructions (1)
**/*.rs
📄 CodeRabbit inference engine (CONTRIBUTING.md)
**/*.rs: Use inline rustdoc documentation for rules, assists, and their options
Use thedbg!()macro for debugging output in Rust tests and code
Use doc tests (doctest) format with code blocks in rustdoc comments; ensure assertions pass in tests
Files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
🧠 Learnings (23)
📓 Common learnings
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `declare_lint_rule!` macro with a `version` field set to `next` for new rules
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For rule changes in changesets, clearly demonstrate what is now invalid that wasn't before, or vice versa
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: Changesets should describe user-facing changes only; internal refactoring without behavior changes does not require a changeset
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: In changesets, reference rules and assists with links to the website documentation
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : New rules must be placed inside the `nursery` group before promotion to other groups
Applied to files:
.changeset/wild-times-design.mdcrates/biome_rule_options/src/lib.rscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new nursery rules, send PRs to the maintenance branch `main`
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Rule option types must derive `Deserializable`, `Serialize`, `Deserialize`, and optionally `JsonSchema` traits
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Apply `#[serde(rename_all = "camelCase")]` to rule option structs to match JSON configuration naming convention
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Apply `#[serde(deny_unknown_fields)]` to rule option structs to enforce strict configuration validation
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Use `Option<_>` wrapper for rule option fields to enable proper merging of configurations
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Implement `biome_deserialize::Merge` for rule option types to define how shared and user configurations are merged
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/biome_rule_options/lib/**/*.rs : Rule options must be defined in the `biome_rule_options` crate with a file named after the rule
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rscrates/biome_rule_options/src/lib.rs
📚 Learning: 2025-11-21T01:10:53.059Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8171
File: crates/biome_js_analyze/src/lint/nursery/no_leaked_render.rs:125-137
Timestamp: 2025-11-21T01:10:53.059Z
Learning: In the Biome codebase, each lint rule has its own options type declaration (e.g., `type Options = RuleNameOptions`) as part of the codegen process, even if the options struct is empty or unused. This is standard practice and should not be flagged as an issue.
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: Applies to **/*.rs : Use inline rustdoc documentation for rules, assists, and their options
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Deprecated rules must include a `deprecated` field in the `declare_lint_rule!` macro with an explanation of what rule to use instead
Applied to files:
crates/biome_rule_options/src/no_floating_classes.rs
📚 Learning: 2025-11-24T18:05:42.356Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.356Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : No module may copy or clone data from another module in the module graph, not even behind an `Arc`
Applied to files:
crates/biome_rule_options/src/lib.rs
📚 Learning: 2025-11-24T18:05:42.356Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.356Z
Learning: Applies to crates/biome_js_type_info/**/local_inference.rs : Implement local inference in dedicated modules to derive type definitions from expressions without context of surrounding scopes
Applied to files:
crates/biome_rule_options/src/lib.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/* : Create test files with `invalid` and `valid` prefixes to represent code that should and should not trigger the rule
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2025-12-04T13:29:49.287Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8291
File: crates/biome_html_formatter/tests/specs/prettier/vue/html-vue/elastic-header.html:10-10
Timestamp: 2025-12-04T13:29:49.287Z
Learning: Files under `crates/biome_html_formatter/tests/specs/prettier` are test fixtures synced from Prettier and should not receive detailed code quality reviews (e.g., HTTP vs HTTPS, formatting suggestions, etc.). These files are test data meant to validate formatter behavior and should be preserved as-is.
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/*.jsonc : Use `.jsonc` format for test files containing multiple code snippets, where each snippet is a string in an array
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Invalid code snippets in rule documentation must emit exactly one diagnostic
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (14)
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🔇 Additional comments (2)
.changeset/wild-times-design.md (1)
1-11: LGTM!Changeset is well-structured with a documentation link and a clear invalid example demonstrating the rule's intent. Based on learnings, this follows the expected format for new lint rules.
crates/biome_rule_options/src/lib.rs (1)
100-100: LGTM!Module declaration is correctly placed in alphabetical order.
CodSpeed Performance ReportMerging this PR will not alter performanceComparing Summary
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🧹 Nitpick comments (1)
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js (1)
1-2: Test case is valid, but consider expanding coverage.The basic case is correct and will trigger the rule. You might want to add a few more invalid cases to strengthen coverage, such as:
new Error("oops"); new MyClass(arg1, arg2);This is optional and can be deferred if you prefer to keep the initial implementation lean.
📜 Review details
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Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (7)
crates/biome_configuration/src/analyzer/linter/rules.rsis excluded by!**/rules.rsand included by**crates/biome_diagnostics_categories/src/categories.rsis excluded by!**/categories.rsand included by**crates/biome_js_analyze/src/lint/nursery.rsis excluded by!**/nursery.rsand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js.snapis excluded by!**/*.snapand included by**crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js.snapis excluded by!**/*.snapand included by**packages/@biomejs/backend-jsonrpc/src/workspace.tsis excluded by!**/backend-jsonrpc/src/workspace.tsand included by**packages/@biomejs/biome/configuration_schema.jsonis excluded by!**/configuration_schema.jsonand included by**
📒 Files selected for processing (6)
.changeset/wild-times-design.mdcrates/biome_js_analyze/src/lint/nursery/no_floating_classes.rscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.jscrates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.jscrates/biome_rule_options/src/lib.rscrates/biome_rule_options/src/no_floating_classes.rs
✅ Files skipped from review due to trivial changes (1)
- crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/valid.js
🚧 Files skipped from review as they are similar to previous changes (3)
- crates/biome_rule_options/src/no_floating_classes.rs
- crates/biome_rule_options/src/lib.rs
- crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
🧰 Additional context used
🧠 Learnings (11)
📓 Common learnings
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `declare_lint_rule!` macro with a `version` field set to `next` for new rules
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/* : Create test files with `invalid` and `valid` prefixes to represent code that should and should not trigger the rule
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2025-12-04T13:29:49.287Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8291
File: crates/biome_html_formatter/tests/specs/prettier/vue/html-vue/elastic-header.html:10-10
Timestamp: 2025-12-04T13:29:49.287Z
Learning: Files under `crates/biome_html_formatter/tests/specs/prettier` are test fixtures synced from Prettier and should not receive detailed code quality reviews (e.g., HTTP vs HTTPS, formatting suggestions, etc.). These files are test data meant to validate formatter behavior and should be preserved as-is.
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/tests/specs/**/*.jsonc : Use `.jsonc` format for test files containing multiple code snippets, where each snippet is a string in an array
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Invalid code snippets in rule documentation must emit exactly one diagnostic
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : New rules must be placed inside the `nursery` group before promotion to other groups
Applied to files:
crates/biome_js_analyze/tests/specs/nursery/noFloatingClasses/invalid.js.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For rule changes in changesets, clearly demonstrate what is now invalid that wasn't before, or vice versa
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new nursery rules, send PRs to the maintenance branch `main`
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: Changesets should describe user-facing changes only; internal refactoring without behavior changes does not require a changeset
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: In changesets, reference rules and assists with links to the website documentation
Applied to files:
.changeset/wild-times-design.md
📚 Learning: 2025-12-21T21:15:03.796Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Applied to files:
.changeset/wild-times-design.md
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (14)
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🔇 Additional comments (1)
.changeset/wild-times-design.md (1)
1-11: Changeset looks good!The documentation follows the guidelines: it includes a link to the rule documentation and provides an invalid example. Well done.
dyc3
reviewed
Jan 12, 2026
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Actionable comments posted: 0
🧹 Nitpick comments (2)
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs (2)
7-7: Unused options type.
NoFloatingClassesOptionsis imported and declared astype Options, butctx.options()is never called inrunordiagnostic. If no configuration is needed, consider usingtype Options = ()instead and removing this import. Based on learnings, rule options should be kept to a minimum.Also applies to: 53-53
34-38: Consider adding a comparison example to the valid section.The rule description mentions "outside of assignments or comparisons", but the valid examples only demonstrate the assignment case. Adding a comparison example would make the documentation more complete.
📝 Suggested documentation addition
/// ### Valid /// /// ```js /// const thing = new Thing(); /// ``` +/// +/// ```js +/// if (new Thing()) { +/// // ... +/// } +/// ``` ///
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⛔ Files ignored due to path filters (2)
packages/@biomejs/backend-jsonrpc/src/workspace.tsis excluded by!**/backend-jsonrpc/src/workspace.tsand included by**packages/@biomejs/biome/configuration_schema.jsonis excluded by!**/configuration_schema.jsonand included by**
📒 Files selected for processing (1)
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
🧰 Additional context used
📓 Path-based instructions (1)
**/*.rs
📄 CodeRabbit inference engine (CONTRIBUTING.md)
**/*.rs: Use inline rustdoc documentation for rules, assists, and their options
Use thedbg!()macro for debugging output in Rust tests and code
Use doc tests (doctest) format with code blocks in rustdoc comments; ensure assertions pass in tests
Files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
🧠 Learnings (16)
📓 Common learnings
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-12-21T21:15:03.796Z
Learning: For new lint rules in changesets, show an example of invalid case in inline code or code block
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `declare_lint_rule!` macro with a `version` field set to `next` for new rules
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `declare_lint_rule!` macro with a `version` field set to `next` for new rules
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : New rules must be placed inside the `nursery` group before promotion to other groups
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `no` prefix when the rule's sole intention is to forbid a single concept
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Deprecated rules must include a `deprecated` field in the `declare_lint_rule!` macro with an explanation of what rule to use instead
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Invalid code snippets in rule documentation must emit exactly one diagnostic
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2025-12-22T09:26:56.943Z
Learnt from: ematipico
Repo: biomejs/biome PR: 8537
File: crates/biome_js_analyze/src/lint/nursery/no_leaked_render.rs:167-210
Timestamp: 2025-12-22T09:26:56.943Z
Learning: When defining lint rules (declare_lint_rule!), only specify fix_kind if the rule implements an action(...) function. Rules that only emit diagnostics without a code fix should omit fix_kind. This applies to all Rust lint rule definitions under crates/.../src/lint (e.g., crates/biome_js_analyze/src/lint/...).
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2025-12-31T15:35:32.899Z
Learnt from: dyc3
Repo: biomejs/biome PR: 8639
File: crates/biome_js_analyze/src/lint/nursery/no_excessive_lines_per_file.rs:101-108
Timestamp: 2025-12-31T15:35:32.899Z
Learning: In Rust lint rules under the nursery category, the issue_number field in declare_lint_rule! is optional and should not be added unless there is a compelling reason. In code reviews, verify that no unnecessary issue_number is included in nursery lint declarations. Only add issue_number if there is an explicit, justified reason (e.g., tracked issue for external observers). This guidance broadly applies to all nursery lint rule files, not just the single file.
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Rule names should use the `use` prefix when the rule's sole intention is to mandate a single concept
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : The first paragraph of rule documentation must be written in a single line to ensure proper rendering in the rules overview table
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Mark rules with `issue_number` in the `declare_lint_rule!` macro if they are work-in-progress to indicate missing features
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `Markup!` macro for diagnostic messages and code action descriptions to ensure proper formatting
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Rule options should be kept to a minimum and only provided when necessary
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Code blocks in rule documentation must specify a language identifier and be tagged with `expect_diagnostic` for invalid examples or remain untagged for valid examples
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : Use `rule_category!()` macro to refer to the diagnostic category instead of dynamically parsing its string name
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
📚 Learning: 2026-01-02T14:58:16.536Z
Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2026-01-02T14:58:16.536Z
Learning: Applies to crates/biome_analyze/**/*_analyze/**/src/lint/**/*.rs : When porting rules from other linters, use `sources` metadata with `RuleSource::Eslint().same()` for identical behavior or `.inspired()` for different behavior
Applied to files:
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (15)
- GitHub Check: Lint project (depot-ubuntu-24.04-arm-16)
- GitHub Check: Lint project (depot-windows-2022)
- GitHub Check: Test (depot-ubuntu-24.04-arm-16)
- GitHub Check: Test (depot-windows-2022-16)
- GitHub Check: Documentation
- GitHub Check: End-to-end tests
- GitHub Check: Check Dependencies
- GitHub Check: Test Node.js API
- GitHub Check: autofix
- GitHub Check: Validate rules documentation
- GitHub Check: Check JS Files
- GitHub Check: Bench (biome_js_analyze)
- GitHub Check: Bench (biome_js_formatter)
- GitHub Check: Bench (biome_configuration)
- GitHub Check: Bench (biome_js_parser)
🔇 Additional comments (2)
crates/biome_js_analyze/src/lint/nursery/no_floating_classes.rs (2)
55-65: LGTM!The logic correctly identifies standalone
newexpressions by checking if the parent is an expression statement. This accurately ports ESLint'sno-newbehaviour.
67-81: LGTM!Clear diagnostic message with an actionable note explaining why and how to address the issue. Properly uses
rule_category!()andmarkup!macros.
ematipico
approved these changes
Jan 18, 2026
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| if let Some(kind) = node.syntax().parent().kind() | ||
| && kind == JsSyntaxKind::JS_EXPRESSION_STATEMENT | ||
| { | ||
| return Some(()); | ||
| } | ||
|
|
||
| None |
Member
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This code can be made more functional by using https://docs.rs/and_then_some/latest/and_then_some/
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Don't you think it's a bit unnecessary to add a new crate for something small like this?
Member
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Ah sorry , wrong link https://doc.rust-lang.org/std/primitive.bool.html#method.then_some
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It's a nit! Don't feel blocked or forced to add it :)
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Summary
Port Eslint's
no-newwhich disallows thenewoperators outside of assignments or comparisons.Closes #8736
Test Plan
Unit tests
Docs
https://eslint.org/docs/latest/rules/no-new