Revert "[12.x] use "class-string" type for using pivot model"

src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php

@@ -564,7 +564,7 @@ protected function newMorphMany(Builder $query, Model $parent, $type, $id, $loca
      * @param  string|null  $parentKey
      * @param  string|null  $relatedKey
      * @param  string|null  $relation
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, $this, \Illuminate\Database\Eloquent\Relations\Pivot>
+     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, $this>
      */
     public function belongsToMany(
         $related,
@@ -624,7 +624,7 @@ public function belongsToMany(
      * @param  string  $parentKey
      * @param  string  $relatedKey
      * @param  string|null  $relationName
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, TDeclaringModel, \Illuminate\Database\Eloquent\Relations\Pivot>
+     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, TDeclaringModel>
      */
     protected function newBelongsToMany(
         Builder $query,

src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php

@@ -20,7 +20,6 @@
 /**
  * @template TRelatedModel of \Illuminate\Database\Eloquent\Model
  * @template TDeclaringModel of \Illuminate\Database\Eloquent\Model
- * @template TPivotModel of \Illuminate\Database\Eloquent\Relations\Pivot
  *
  * @extends \Illuminate\Database\Eloquent\Relations\Relation<TRelatedModel, TDeclaringModel, \Illuminate\Database\Eloquent\Collection<int, TRelatedModel>>
  */
@@ -129,7 +128,7 @@ class BelongsToMany extends Relation
     /**
      * The class name of the custom pivot model to use for the relationship.
      *
-     * @var class-string<TPivotModel>
+     * @var string
      */
     protected $using;
 
@@ -317,7 +316,7 @@ protected function buildDictionary(EloquentCollection $results)
     /**
      * Get the class being used for pivot models.
      *
-     * @return class-string<TPivotModel>
+     * @return string
      */
     public function getPivotClass()
     {
@@ -327,7 +326,7 @@ public function getPivotClass()
     /**
      * Specify the custom pivot model to use for the relationship.
      *
-     * @param  class-string<TPivotModel>  $class
+     * @param  string  $class
      * @return $this
      */
     public function using($class)

src/Illuminate/Database/Eloquent/Relations/MorphToMany.php

@@ -11,7 +11,7 @@
  * @template TRelatedModel of \Illuminate\Database\Eloquent\Model
  * @template TDeclaringModel of \Illuminate\Database\Eloquent\Model
  *
- * @extends \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, TDeclaringModel, \Illuminate\Database\Eloquent\Relations\Pivot>
+ * @extends \Illuminate\Database\Eloquent\Relations\BelongsToMany<TRelatedModel, TDeclaringModel>
  */
 class MorphToMany extends BelongsToMany
 {

types/Database/Eloquent/Relations.php

@@ -41,7 +41,7 @@ function test(User $user, Post $post, Comment $comment, ChildUser $child): void
     assertType('Illuminate\Types\Relations\Post|false', $user->posts()->save(new Post()));
     assertType('Illuminate\Types\Relations\Post|false', $user->posts()->saveQuietly(new Post()));
 
-    assertType('Illuminate\Database\Eloquent\Relations\BelongsToMany<Illuminate\Types\Relations\Role, Illuminate\Types\Relations\User, Illuminate\Database\Eloquent\Relations\Pivot>', $user->roles());
+    assertType('Illuminate\Database\Eloquent\Relations\BelongsToMany<Illuminate\Types\Relations\Role, Illuminate\Types\Relations\User>', $user->roles());
     assertType('Illuminate\Database\Eloquent\Collection<int, Illuminate\Types\Relations\Role>', $user->roles()->getResults());
     assertType('Illuminate\Database\Eloquent\Collection<int, Illuminate\Types\Relations\Role>', $user->roles()->find([1]));
     assertType('Illuminate\Database\Eloquent\Collection<int, Illuminate\Types\Relations\Role>', $user->roles()->findMany([1, 2, 3]));
@@ -157,11 +157,11 @@ public function latestPost(): HasOne
         return $post;
     }
 
-    /** @return BelongsToMany<Role, $this, \Illuminate\Database\Eloquent\Relations\Pivot> */
+    /** @return BelongsToMany<Role, $this> */
     public function roles(): BelongsToMany
     {
         $belongsToMany = $this->belongsToMany(Role::class);
-        assertType('Illuminate\Database\Eloquent\Relations\BelongsToMany<Illuminate\Types\Relations\Role, $this(Illuminate\Types\Relations\User), Illuminate\Database\Eloquent\Relations\Pivot>', $belongsToMany);
+        assertType('Illuminate\Database\Eloquent\Relations\BelongsToMany<Illuminate\Types\Relations\Role, $this(Illuminate\Types\Relations\User)>', $belongsToMany);
 
         return $belongsToMany;
     }