biomejs · arendjr · Aug 5, 2025 · Jul 30, 2025 · Jul 30, 2025 · Jul 30, 2025
diff --git a/.changeset/use-consistent-type-definitions.md b/.changeset/use-consistent-type-definitions.md
@@ -0,0 +1,38 @@
+---
+"@biomejs/biome": patch
+---
+
+Added the [`useConsistentTypeDefinitions`](https://biomejs.dev/rules/use-consistent-type-definitions) rule.
+
+This rule enforces consistent usage of either `interface` or `type` for object type definitions in TypeScript.
+
+The rule accepts an option to specify the preferred style:
+- `interface` (default): Prefer using `interface` for object type definitions
+- `type`: Prefer using `type` for object type definitions
+
+Examples:
+
+```ts
+// With default option (interface)
+// ❌ Invalid
+type Point = { x: number; y: number; };
+
+// ✅ Valid  
+interface Point {
+  x: number;
+  y: number;
+}
+
+// With option { style: "type" }
+// ❌ Invalid
+interface Point {
+  x: number;
+  y: number;
+}
+
+// ✅ Valid
+type Point = { x: number; y: number; };
+```
+
+The rule will automatically fix simple cases where conversion is straightforward.
+
diff --git a/crates/biome_cli/src/execute/migrate/eslint_any_rule_to_biome.rs b/crates/biome_cli/src/execute/migrate/eslint_any_rule_to_biome.rs
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
@@ -201,6 +201,7 @@ define_categories! {
     "lint/nursery/useBiomeSuppressionComment": "https://biomejs.dev/linter/rules/use-biome-suppression-comment",
     "lint/nursery/useConsistentObjectDefinition": "https://biomejs.dev/linter/rules/use-consistent-object-definition",
     "lint/nursery/useConsistentResponse": "https://biomejs.dev/linter/rules/use-consistent-response",
+    "lint/nursery/useConsistentTypeDefinitions": "https://biomejs.dev/linter/rules/use-consistent-type-definitions",
     "lint/nursery/useExhaustiveSwitchCases": "https://biomejs.dev/linter/rules/use-exhaustive-switch-cases",
     "lint/nursery/useExplicitFunctionReturnType": "https://biomejs.dev/linter/rules/use-explicit-type",
     "lint/nursery/useExplicitType": "https://biomejs.dev/linter/rules/use-explicit-type",

diff --git a/crates/biome_js_analyze/src/lint/nursery.rs b/crates/biome_js_analyze/src/lint/nursery.rs
@@ -35,6 +35,7 @@ pub mod use_adjacent_getter_setter;
 pub mod use_anchor_href;
 pub mod use_consistent_object_definition;
 pub mod use_consistent_response;
+pub mod use_consistent_type_definitions;
 pub mod use_exhaustive_switch_cases;
 pub mod use_explicit_type;
 pub mod use_exports_last;
@@ -55,4 +56,4 @@ pub mod use_sorted_classes;
 pub mod use_symbol_description;
 pub mod use_unified_type_signature;
 pub mod use_unique_element_ids;
-declare_lint_group! { pub Nursery { name : "nursery" , rules : [self :: no_await_in_loop :: NoAwaitInLoop , self :: no_bitwise_operators :: NoBitwiseOperators , self :: no_constant_binary_expression :: NoConstantBinaryExpression , self :: no_destructured_props :: NoDestructuredProps , self :: no_excessive_lines_per_function :: NoExcessiveLinesPerFunction , self :: no_floating_promises :: NoFloatingPromises , self :: no_global_dirname_filename :: NoGlobalDirnameFilename , self :: no_implicit_coercion :: NoImplicitCoercion , self :: no_import_cycles :: NoImportCycles , self :: no_magic_numbers :: NoMagicNumbers , self :: no_misused_promises :: NoMisusedPromises , self :: no_nested_component_definitions :: NoNestedComponentDefinitions , self :: no_noninteractive_element_interactions :: NoNoninteractiveElementInteractions , self :: no_process_global :: NoProcessGlobal , self :: no_qwik_use_visible_task :: NoQwikUseVisibleTask , self :: no_react_prop_assign :: NoReactPropAssign , self :: no_restricted_elements :: NoRestrictedElements , self :: no_secrets :: NoSecrets , self :: no_shadow :: NoShadow , self :: no_ts_ignore :: NoTsIgnore , self :: no_unassigned_variables :: NoUnassignedVariables , self :: no_unresolved_imports :: NoUnresolvedImports , self :: no_unwanted_polyfillio :: NoUnwantedPolyfillio , self :: no_useless_backref_in_regex :: NoUselessBackrefInRegex , self :: no_useless_escape_in_string :: NoUselessEscapeInString , self :: no_useless_undefined :: NoUselessUndefined , self :: no_vue_reserved_keys :: NoVueReservedKeys , self :: no_vue_reserved_props :: NoVueReservedProps , self :: use_adjacent_getter_setter :: UseAdjacentGetterSetter , self :: use_anchor_href :: UseAnchorHref , self :: use_consistent_object_definition :: UseConsistentObjectDefinition , self :: use_consistent_response :: UseConsistentResponse , self :: use_exhaustive_switch_cases :: UseExhaustiveSwitchCases , self :: use_explicit_type :: UseExplicitType , self :: use_exports_last :: UseExportsLast , self :: use_for_component :: UseForComponent , self :: use_google_font_preconnect :: UseGoogleFontPreconnect , self :: use_image_size :: UseImageSize , self :: use_index_of :: UseIndexOf , self :: use_iterable_callback_return :: UseIterableCallbackReturn , self :: use_json_import_attribute :: UseJsonImportAttribute , self :: use_numeric_separators :: UseNumericSeparators , self :: use_object_spread :: UseObjectSpread , self :: use_parse_int_radix :: UseParseIntRadix , self :: use_qwik_classlist :: UseQwikClasslist , self :: use_react_function_components :: UseReactFunctionComponents , self :: use_readonly_class_properties :: UseReadonlyClassProperties , self :: use_single_js_doc_asterisk :: UseSingleJsDocAsterisk , self :: use_sorted_classes :: UseSortedClasses , self :: use_symbol_description :: UseSymbolDescription , self :: use_unified_type_signature :: UseUnifiedTypeSignature , self :: use_unique_element_ids :: UseUniqueElementIds ,] } }
+declare_lint_group! { pub Nursery { name : "nursery" , rules : [self :: no_await_in_loop :: NoAwaitInLoop , self :: no_bitwise_operators :: NoBitwiseOperators , self :: no_constant_binary_expression :: NoConstantBinaryExpression , self :: no_destructured_props :: NoDestructuredProps , self :: no_excessive_lines_per_function :: NoExcessiveLinesPerFunction , self :: no_floating_promises :: NoFloatingPromises , self :: no_global_dirname_filename :: NoGlobalDirnameFilename , self :: no_implicit_coercion :: NoImplicitCoercion , self :: no_import_cycles :: NoImportCycles , self :: no_magic_numbers :: NoMagicNumbers , self :: no_misused_promises :: NoMisusedPromises , self :: no_nested_component_definitions :: NoNestedComponentDefinitions , self :: no_noninteractive_element_interactions :: NoNoninteractiveElementInteractions , self :: no_process_global :: NoProcessGlobal , self :: no_qwik_use_visible_task :: NoQwikUseVisibleTask , self :: no_react_prop_assign :: NoReactPropAssign , self :: no_restricted_elements :: NoRestrictedElements , self :: no_secrets :: NoSecrets , self :: no_shadow :: NoShadow , self :: no_ts_ignore :: NoTsIgnore , self :: no_unassigned_variables :: NoUnassignedVariables , self :: no_unresolved_imports :: NoUnresolvedImports , self :: no_unwanted_polyfillio :: NoUnwantedPolyfillio , self :: no_useless_backref_in_regex :: NoUselessBackrefInRegex , self :: no_useless_escape_in_string :: NoUselessEscapeInString , self :: no_useless_undefined :: NoUselessUndefined , self :: no_vue_reserved_keys :: NoVueReservedKeys , self :: no_vue_reserved_props :: NoVueReservedProps , self :: use_adjacent_getter_setter :: UseAdjacentGetterSetter , self :: use_anchor_href :: UseAnchorHref , self :: use_consistent_object_definition :: UseConsistentObjectDefinition , self :: use_consistent_response :: UseConsistentResponse , self :: use_consistent_type_definitions :: UseConsistentTypeDefinitions , self :: use_exhaustive_switch_cases :: UseExhaustiveSwitchCases , self :: use_explicit_type :: UseExplicitType , self :: use_exports_last :: UseExportsLast , self :: use_for_component :: UseForComponent , self :: use_google_font_preconnect :: UseGoogleFontPreconnect , self :: use_image_size :: UseImageSize , self :: use_index_of :: UseIndexOf , self :: use_iterable_callback_return :: UseIterableCallbackReturn , self :: use_json_import_attribute :: UseJsonImportAttribute , self :: use_numeric_separators :: UseNumericSeparators , self :: use_object_spread :: UseObjectSpread , self :: use_parse_int_radix :: UseParseIntRadix , self :: use_qwik_classlist :: UseQwikClasslist , self :: use_react_function_components :: UseReactFunctionComponents , self :: use_readonly_class_properties :: UseReadonlyClassProperties , self :: use_single_js_doc_asterisk :: UseSingleJsDocAsterisk , self :: use_sorted_classes :: UseSortedClasses , self :: use_symbol_description :: UseSymbolDescription , self :: use_unified_type_signature :: UseUnifiedTypeSignature , self :: use_unique_element_ids :: UseUniqueElementIds ,] } }