# biome style/useNamingConvention: fix is not a fixpoint Internal evidence sheet generated by fixhunt. Not an issue text. A human re-verifies, checks the duplicates below, and writes the upstream report in their own words following the project's AI policy. - Tool: biome 2.5.15 - Rule: style/useNamingConvention (tool labels the fix: safe, this fix reported as safe) - Oracle: fix-not-fixpoint - Judge (Nemotron 3 Ultra, advisory): real, severity high. The fix renames class A_value to AValue, but the eval string concatenates Base.name to dynamically extend that class. After the fix, Base.name becomes 'AValue', so the eval tries to extend a non-existent class, changing program behavior from successful class creation to a ReferenceError. - Program: minimized from 3 to 2 lines ## Reproducer ```js let Base = class A_value {}; let Derived = eval('class extends ' + Base.name + ' {}'); ``` ## Commands ```sh node prog.js bunx @biomejs/biome lint --only=style/useNamingConvention --write prog.js node prog.js ``` ## Observed ``` 1 diagnostics before, 1 after the fix ``` ## Diff applied by the fix ```diff --- orig.js 2026-10-22 13:35:12.719794876 -0400 +++ fixed.js 2026-10-22 13:35:14.782829676 -0400 @@ -1,2 +1,2 @@ -let Base = class A_value {}; +let Base = class AValue {}; let Derived = eval('class extends ' + Base.name + ' {}'); ``` ## Why the rewrite is not equivalent (model draft, verify before use) The rename changes `Base.name` from `"A_value"` to `"AValue"`, so the string passed to `eval` becomes `"class extends AValue {}"` instead of `"class extends A_value {}"`. This alters the dynamically generated class’s name, which can affect runtime behavior such as `name` property access, `instanceof` checks relying on constructor identity, or serialization that depends on the class name. Thus the transformation is not semantics‑preserving. ## Upstream search Queries: "useNamingConvention fix", "style useNamingConvention class name", "Biome lint rule style/useNamingConvention", "fix class identifier naming convention" - related: https://github.com/biomejs/biome/issues/664 Same rule (useNamingConvention) and same symptom (fix suggests same name), but different construct (variable vs class declaration). - related: https://github.com/biomejs/biome/issues/4873 Same rule (useNamingConvention) with fix breaking code, but different construct and cause (general fix breakage vs class rename breaking eval reference). - related: https://github.com/biomejs/biome/issues/1786 Same rule (useNamingConvention) suggesting useless fix (same name), but different construct (property with Korean chars vs class with underscore). - related: https://github.com/biomejs/biome/issues/5173 Same rule (useNamingConvention) with naming convention strictness issue, but about $ matching in names not class renames breaking eval. - related: https://github.com/biomejs/biome/issues/157 Same rule (useNamingConvention) about being too strict, but general strictness complaint not specific fix breaking eval reference. - related: https://github.com/biomejs/biome/issues/11548 Same rule (useNamingConvention) about incorrect selector overrides, but about configuration not the fix breaking runtime behavior. - related: https://github.com/biomejs/biome/issues/7575 Same rule (useNamingConvention) about being too aggressive, but general aggressiveness not specific fix breaking eval reference.
All hits - [github, open] πŸ’… `useNamingConvention` safe fix renames globals declared in script-mode TypeScript files β€” https://github.com/biomejs/biome/issues/11936 - [github, open] πŸ’… When using useNamingConvention, prefix and suffix functionality cannot be used in destructuring assignment renaming. β€” https://github.com/biomejs/biome/issues/8953 - [github, closed] πŸ’… `useNamingConvention` does not ignore `declare global` namespaces β€” https://github.com/biomejs/biome/issues/11566 - [github, open] πŸ’… noLeakedRender false positive when using useState β€” https://github.com/biomejs/biome/issues/10790 - [github, open] πŸ’… `useNullishCoalescing` safe autofix changes runtime behavior for `=== null` / `=== undefined` ternaries on `T | null | undefined` β€” https://github.com/biomejs/biome/issues/10464 - [github, closed] πŸ“ declare keyword should be in front of public/protected/private β€” https://github.com/biomejs/biome/issues/11500 - [github, closed] πŸ’… `noFloatingPromise` does not catch missing promises when called through Playwright fixtures β€” https://github.com/biomejs/biome/issues/11692 - [github, closed] πŸ’… `useSimplifiedLogicExpression` "safe" fix breaks code β€” https://github.com/biomejs/biome/issues/11351 - [github, closed] πŸ’… `useExplicitLengthCheck` false positive and broken fix β€” https://github.com/biomejs/biome/issues/11558 - [github, closed] πŸ’… Corrupted CLI safe fix for `useConsistentArrowReturn` β€” https://github.com/biomejs/biome/issues/8347 - [tavily] πŸ› useNamingConvention same fix as the current one Β· Issue #664 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/664 - [tavily] πŸ’… `useNamingConvention` fix breaks code Β· Issue #4873 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/4873 - [tavily] πŸ› Setting rule's `fix` overrides the inheirited `options` from a shared config Β· Issue #7943 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/7943 - [tavily] πŸ’… `useNamingConvention` can suggest useless fix Β· Issue #1786 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/1786 - [tavily] πŸ› Panic in useNamingConvention with `biome check --write` (builder.rs:217) Β· Issue #7798 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/7798 - [github, closed] πŸ’… `complexity/nouselessconstructor` false positive β€” https://github.com/biomejs/biome/issues/7495 - [github, closed] πŸ’… [Bug] Unexpected "Missing key" error in Astro with `useJsxKeyInIterable` β€” https://github.com/biomejs/biome/issues/9572 - [github, closed] πŸ’… Support :active-view-transition pseudo-class in CSS linter β€” https://github.com/biomejs/biome/issues/8777 - [github, closed] πŸ’… False positive for noUnusedPrivateClassMembers when method is used as a variable β€” https://github.com/biomejs/biome/issues/8176 - [github, closed] πŸ’… `noUnusedPrivateClassMembers` does not handle bracket notation β€” https://github.com/biomejs/biome/issues/7323 - [github, closed] πŸ’… Can modifiers distinguish between public and private methods? Unlike ESLint behavior? β€” https://github.com/biomejs/biome/issues/6677 - [github, closed] πŸ’… False positive by useReadonlyClassProperties β€” https://github.com/biomejs/biome/issues/6634 - [github, closed] πŸ’… matching $ unsupported in naming convention due to Anchor assumption β€” https://github.com/biomejs/biome/issues/5173 - [tavily] πŸ› `useNamingConvention` too strict Β· Issue #157 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/157 - [tavily] πŸ’… `useJsxKeyInIterable` shows warning even key is specified Β· Issue #3020 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/3020 - [tavily] πŸ’… `noUndeclaredDependencies`: not resolving tsconfig paths nor package subpaths Β· Issue #2012 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/2012 - [github, open] πŸ’… lint/style/useNamingConvention: Incorrect selector overrides β€” https://github.com/biomejs/biome/issues/11548 - [github, open] πŸ’… false positive of `noUndeclaredDependencies` with `@types/vscode` β€” https://github.com/biomejs/biome/issues/11012 - [github, open] πŸ’… lint/nursery/noUselessUndefined does not flag parameters β€” https://github.com/biomejs/biome/issues/6578 - [github, open] πŸ’… Add option allowWhitespace for useSingleJsDocAsterisk β€” https://github.com/biomejs/biome/issues/6576 - [github, open] πŸ’… Incorrectly suggest to discard redundant terms (useSimplifiedLogicExpression) β€” https://github.com/biomejs/biome/issues/8577 - [tavily] πŸ’… useNamingConvention is a bit too aggressive Β· Issue #7575 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/7575 - [tavily] πŸ“Ž Implement `biome lint --summary` Β· Issue #57 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/57 - [tavily] β˜‚οΈ stylelint recommended rules Β· Issue #2511 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/2511 - [tavily] A required whitespace is removed in class template string with useSortedClasses Β· Issue #4041 Β· biomejs/biome Β· GitHub β€” https://github.com/biomejs/biome/issues/4041