biomejs · dyc3 · Oct 31, 2025 · Oct 30, 2025 · Oct 30, 2025 · Oct 30, 2025
diff --git a/.changeset/no-parameters-only-used-in-recursion.md b/.changeset/no-parameters-only-used-in-recursion.md
@@ -0,0 +1,17 @@
+---
+"@biomejs/biome": patch
+---
+
+Added the rule [`noParametersOnlyUsedInRecursion`](https://biomejs.dev/linter/rules/no-parameters-only-used-in-recursion/).
+
+This rule detects function parameters that are exclusively used in recursive calls and can be removed to simplify the function signature since they are effectively unused.
+
+```js
+function factorial(n, acc) {
+    if (n === 0) return 1;
+    return factorial(n - 1, acc);  // acc is only used here
+}
+```
+
+
+Fixes [#6484](https://github.com/biomejs/biome/issues/6484).
diff --git a/crates/biome_configuration/src/analyzer/linter/rules.rs b/crates/biome_configuration/src/analyzer/linter/rules.rs
diff --git a/crates/biome_diagnostics_categories/src/categories.rs b/crates/biome_diagnostics_categories/src/categories.rs
@@ -176,6 +176,7 @@ define_categories! {
     "lint/nursery/noMissingGenericFamilyKeyword": "https://biomejs.dev/linter/rules/no-missing-generic-family-keyword",
     "lint/nursery/noMisusedPromises": "https://biomejs.dev/linter/rules/no-misused-promises",
     "lint/nursery/noNextAsyncClientComponent": "https://biomejs.dev/linter/rules/no-next-async-client-component",
+    "lint/nursery/noParametersOnlyUsedInRecursion": "https://biomejs.dev/linter/rules/no-parameters-only-used-in-recursion",
     "lint/nursery/noReactForwardRef": "https://biomejs.dev/linter/rules/no-react-forward-ref",
     "lint/nursery/noShadow": "https://biomejs.dev/linter/rules/no-shadow",
     "lint/nursery/noUnnecessaryConditions": "https://biomejs.dev/linter/rules/no-unnecessary-conditions",

diff --git a/crates/biome_js_analyze/src/lint/nursery.rs b/crates/biome_js_analyze/src/lint/nursery.rs
@@ -11,6 +11,7 @@ pub mod no_increment_decrement;
 pub mod no_jsx_literals;
 pub mod no_misused_promises;
 pub mod no_next_async_client_component;
+pub mod no_parameters_only_used_in_recursion;
 pub mod no_react_forward_ref;
 pub mod no_shadow;
 pub mod no_unnecessary_conditions;
@@ -31,4 +32,4 @@ pub mod use_qwik_valid_lexical_scope;
 pub mod use_sorted_classes;
 pub mod use_vue_define_macros_order;
 pub mod use_vue_multi_word_component_names;
-declare_lint_group! { pub Nursery { name : "nursery" , rules : [self :: no_deprecated_imports :: NoDeprecatedImports , self :: no_empty_source :: NoEmptySource , self :: no_floating_promises :: NoFloatingPromises , self :: no_import_cycles :: NoImportCycles , self :: no_increment_decrement :: NoIncrementDecrement , self :: no_jsx_literals :: NoJsxLiterals , self :: no_misused_promises :: NoMisusedPromises , self :: no_next_async_client_component :: NoNextAsyncClientComponent , self :: no_react_forward_ref :: NoReactForwardRef , self :: no_shadow :: NoShadow , self :: no_unnecessary_conditions :: NoUnnecessaryConditions , self :: no_unresolved_imports :: NoUnresolvedImports , self :: no_unused_expressions :: NoUnusedExpressions , self :: no_useless_catch_binding :: NoUselessCatchBinding , self :: no_useless_undefined :: NoUselessUndefined , self :: no_vue_data_object_declaration :: NoVueDataObjectDeclaration , self :: no_vue_duplicate_keys :: NoVueDuplicateKeys , self :: no_vue_reserved_keys :: NoVueReservedKeys , self :: no_vue_reserved_props :: NoVueReservedProps , self :: use_consistent_arrow_return :: UseConsistentArrowReturn , self :: use_exhaustive_switch_cases :: UseExhaustiveSwitchCases , self :: use_explicit_type :: UseExplicitType , self :: use_max_params :: UseMaxParams , self :: use_qwik_method_usage :: UseQwikMethodUsage , self :: use_qwik_valid_lexical_scope :: UseQwikValidLexicalScope , self :: use_sorted_classes :: UseSortedClasses , self :: use_vue_define_macros_order :: UseVueDefineMacrosOrder , self :: use_vue_multi_word_component_names :: UseVueMultiWordComponentNames ,] } }
+declare_lint_group! { pub Nursery { name : "nursery" , rules : [self :: no_deprecated_imports :: NoDeprecatedImports , self :: no_empty_source :: NoEmptySource , self :: no_floating_promises :: NoFloatingPromises , self :: no_import_cycles :: NoImportCycles , self :: no_increment_decrement :: NoIncrementDecrement , self :: no_jsx_literals :: NoJsxLiterals , self :: no_misused_promises :: NoMisusedPromises , self :: no_next_async_client_component :: NoNextAsyncClientComponent , self :: no_parameters_only_used_in_recursion :: NoParametersOnlyUsedInRecursion , self :: no_react_forward_ref :: NoReactForwardRef , self :: no_shadow :: NoShadow , self :: no_unnecessary_conditions :: NoUnnecessaryConditions , self :: no_unresolved_imports :: NoUnresolvedImports , self :: no_unused_expressions :: NoUnusedExpressions , self :: no_useless_catch_binding :: NoUselessCatchBinding , self :: no_useless_undefined :: NoUselessUndefined , self :: no_vue_data_object_declaration :: NoVueDataObjectDeclaration , self :: no_vue_duplicate_keys :: NoVueDuplicateKeys , self :: no_vue_reserved_keys :: NoVueReservedKeys , self :: no_vue_reserved_props :: NoVueReservedProps , self :: use_consistent_arrow_return :: UseConsistentArrowReturn , self :: use_exhaustive_switch_cases :: UseExhaustiveSwitchCases , self :: use_explicit_type :: UseExplicitType , self :: use_max_params :: UseMaxParams , self :: use_qwik_method_usage :: UseQwikMethodUsage , self :: use_qwik_valid_lexical_scope :: UseQwikValidLexicalScope , self :: use_sorted_classes :: UseSortedClasses , self :: use_vue_define_macros_order :: UseVueDefineMacrosOrder , self :: use_vue_multi_word_component_names :: UseVueMultiWordComponentNames ,] } }