From f9e36f17386cd0f14dd6101bf37183e73f37c19a Mon Sep 17 00:00:00 2001
From: Sysix <3897725+Sysix@users.noreply.github.com>
Date: Fri, 12 Jun 2026 00:45:30 +0000
Subject: [PATCH] feat(linter): add schema for
 `typescript/no-duplicate-type-constituents` (#23308)

---
 .../oxlint/src-js/package/config.generated.ts | 17 ++++++++-
 crates/oxc_linter/src/utils/schemars.rs       |  3 +-
 npm/oxlint/configuration_schema.json          | 37 ++++++++++++++++++-
 .../src/snapshots/schema_json.snap            | 37 ++++++++++++++++++-
 4 files changed, 89 insertions(+), 5 deletions(-)

diff --git a/apps/oxlint/src-js/package/config.generated.ts b/apps/oxlint/src-js/package/config.generated.ts
index 45f53713b1..ac01a5923e 100644
--- a/apps/oxlint/src-js/package/config.generated.ts
+++ b/apps/oxlint/src-js/package/config.generated.ts
@@ -1310,7 +1310,10 @@ export interface DummyRuleMap {
     | [AllowWarnDeny, NoConfusingVoidExpressionConfig];
   "typescript/no-deprecated"?: AllowWarnDeny | [AllowWarnDeny] | [AllowWarnDeny, NoDeprecatedConfig];
   "typescript/no-duplicate-enum-values"?: RuleNoConfig;
-  "typescript/no-duplicate-type-constituents"?: DummyRule;
+  "typescript/no-duplicate-type-constituents"?:
+    | AllowWarnDeny
+    | [AllowWarnDeny]
+    | [AllowWarnDeny, NoDuplicateTypeConstituentsConfig];
   "typescript/no-dynamic-delete"?: RuleNoConfig;
   "typescript/no-empty-interface"?: AllowWarnDeny | [AllowWarnDeny] | [AllowWarnDeny, NoEmptyInterface];
   "typescript/no-empty-object-type"?: DummyRule;
@@ -4698,6 +4701,18 @@ export interface PackageSpecifier {
    */
   package: string;
 }
+export interface NoDuplicateTypeConstituentsConfig {
+  /**
+   * Whether to ignore duplicate types in intersection types.
+   * When true, allows `type T = A & A`.
+   */
+  ignoreIntersections?: boolean;
+  /**
+   * Whether to ignore duplicate types in union types.
+   * When true, allows `type T = A | A`.
+   */
+  ignoreUnions?: boolean;
+}
 export interface NoEmptyInterface {
   /**
    * When set to `true`, allows empty interfaces that extend a single interface.
diff --git a/crates/oxc_linter/src/utils/schemars.rs b/crates/oxc_linter/src/utils/schemars.rs
index 19b210fbbe..e02f03d186 100644
--- a/crates/oxc_linter/src/utils/schemars.rs
+++ b/crates/oxc_linter/src/utils/schemars.rs
@@ -13,7 +13,7 @@ use crate::rules::RuleEnum;
 /// These should return the DummyRule struct/schema instead of the actual rule struct/schema,
 /// until we verify that the rule's schema is valid and can be generated by schemars.
 #[cfg(feature = "ruledocs")]
-const NO_VERIFIED_VALID_SCHEMA: [&str; 42] = [
+const NO_VERIFIED_VALID_SCHEMA: [&str; 41] = [
     "eslint/func-name-matching",
     "eslint/no-restricted-globals",
     "eslint/no-restricted-imports",
@@ -48,7 +48,6 @@ const NO_VERIFIED_VALID_SCHEMA: [&str; 42] = [
     "typescript/consistent-type-assertions",
     "typescript/consistent-type-imports",
     "typescript/no-empty-object-type",
-    "typescript/no-duplicate-type-constituents",
     "typescript/no-restricted-types",
     "unicorn/filename-case",
     "unicorn/import-style",
diff --git a/npm/oxlint/configuration_schema.json b/npm/oxlint/configuration_schema.json
index ee1c6078d3..42ef7487c9 100644
--- a/npm/oxlint/configuration_schema.json
+++ b/npm/oxlint/configuration_schema.json
@@ -6402,7 +6402,24 @@
           "$ref": "#/definitions/RuleNoConfig"
         },
         "typescript/no-duplicate-type-constituents": {
-          "$ref": "#/definitions/DummyRule"
+          "anyOf": [
+            {
+              "$ref": "#/definitions/AllowWarnDeny"
+            },
+            {
+              "type": "array",
+              "items": [
+                {
+                  "$ref": "#/definitions/AllowWarnDeny"
+                },
+                {
+                  "$ref": "#/definitions/NoDuplicateTypeConstituentsConfig"
+                }
+              ],
+              "maxItems": 2,
+              "minItems": 1
+            }
+          ]
         },
         "typescript/no-dynamic-delete": {
           "$ref": "#/definitions/RuleNoConfig"
@@ -11456,6 +11473,24 @@
       },
       "additionalProperties": false
     },
+    "NoDuplicateTypeConstituentsConfig": {
+      "type": "object",
+      "properties": {
+        "ignoreIntersections": {
+          "description": "Whether to ignore duplicate types in intersection types.\nWhen true, allows `type T = A & A`.",
+          "default": false,
+          "type": "boolean",
+          "markdownDescription": "Whether to ignore duplicate types in intersection types.\nWhen true, allows `type T = A & A`."
+        },
+        "ignoreUnions": {
+          "description": "Whether to ignore duplicate types in union types.\nWhen true, allows `type T = A | A`.",
+          "default": false,
+          "type": "boolean",
+          "markdownDescription": "Whether to ignore duplicate types in union types.\nWhen true, allows `type T = A | A`."
+        }
+      },
+      "additionalProperties": false
+    },
     "NoDuplicates": {
       "type": "object",
       "properties": {
diff --git a/tasks/website_linter/src/snapshots/schema_json.snap b/tasks/website_linter/src/snapshots/schema_json.snap
index 8a31f22fb4..69440504d1 100644
--- a/tasks/website_linter/src/snapshots/schema_json.snap
+++ b/tasks/website_linter/src/snapshots/schema_json.snap
@@ -6406,7 +6406,24 @@ expression: json
           "$ref": "#/definitions/RuleNoConfig"
         },
         "typescript/no-duplicate-type-constituents": {
-          "$ref": "#/definitions/DummyRule"
+          "anyOf": [
+            {
+              "$ref": "#/definitions/AllowWarnDeny"
+            },
+            {
+              "type": "array",
+              "items": [
+                {
+                  "$ref": "#/definitions/AllowWarnDeny"
+                },
+                {
+                  "$ref": "#/definitions/NoDuplicateTypeConstituentsConfig"
+                }
+              ],
+              "maxItems": 2,
+              "minItems": 1
+            }
+          ]
         },
         "typescript/no-dynamic-delete": {
           "$ref": "#/definitions/RuleNoConfig"
@@ -11460,6 +11477,24 @@ expression: json
       },
       "additionalProperties": false
     },
+    "NoDuplicateTypeConstituentsConfig": {
+      "type": "object",
+      "properties": {
+        "ignoreIntersections": {
+          "description": "Whether to ignore duplicate types in intersection types.\nWhen true, allows `type T = A & A`.",
+          "default": false,
+          "type": "boolean",
+          "markdownDescription": "Whether to ignore duplicate types in intersection types.\nWhen true, allows `type T = A & A`."
+        },
+        "ignoreUnions": {
+          "description": "Whether to ignore duplicate types in union types.\nWhen true, allows `type T = A | A`.",
+          "default": false,
+          "type": "boolean",
+          "markdownDescription": "Whether to ignore duplicate types in union types.\nWhen true, allows `type T = A | A`."
+        }
+      },
+      "additionalProperties": false
+    },
     "NoDuplicates": {
       "type": "object",
       "properties": {