Source

File: wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php

public function __construct( $parent_post_type ) {
		$this->parent_post_type = $parent_post_type;
		$post_type_object       = get_post_type_object( $parent_post_type );
		$parent_controller      = $post_type_object->get_rest_controller();

		if ( ! $parent_controller ) {
			$parent_controller = new WP_REST_Posts_Controller( $parent_post_type );
		}

		$this->parent_controller    = $parent_controller;
		$this->revisions_controller = new WP_REST_Revisions_Controller( $parent_post_type );
		$this->rest_namespace       = 'wp/v2';
		$this->rest_base            = 'autosaves';
		$this->parent_base          = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
	}