fix: correct returning self signature

src/Field.php

@@ -73,9 +73,9 @@ interface Field {
 	/** @return array<string,int> */
 	public function get_data(): array;
 
-	public function add_data( string $data_name, string $data_value ): self;
+	public function add_data( string $data_name, string $data_value ): Field;
 
-	public function unset_data( string $data_name ): self;
+	public function unset_data( string $data_name ): Field;
 
 	/** @return mixed */
 	public function get_possible_values();

src/Field/BasicField.php

@@ -3,7 +3,6 @@
 namespace WPDesk\Forms\Field;
 
 use WPDesk\Forms\Field;
-use WPDesk\Forms\Form\FormWithFields;
 use WPDesk\Forms\Sanitizer;
 use WPDesk\Forms\Sanitizer\NoSanitize;
 use WPDesk\Forms\Serializer;
@@ -38,7 +37,7 @@ abstract class BasicField implements Field {
 		return $this->meta['label'];
 	}
 
-	public function set_label( string $value ): self {
+	public function set_label( string $value ): Field {
 		$this->meta['label'] = $value;
 
 		return $this;
@@ -68,13 +67,13 @@ abstract class BasicField implements Field {
 		return isset( $this->meta['description'] );
 	}
 
-	public function set_description( string $value ): self {
+	public function set_description( string $value ): Field {
 		$this->meta['description'] = $value;
 
 		return $this;
 	}
 
-	public function set_description_tip( string $value ): self {
+	public function set_description_tip( string $value ): Field {
 		$this->meta['description_tip'] = $value;
 
 		return $this;
@@ -84,7 +83,7 @@ abstract class BasicField implements Field {
 		return $this->attributes['type'];
 	}
 
-	public function set_placeholder( string $value ): self {
+	public function set_placeholder( string $value ): Field {
 		$this->meta['placeholder'] = $value;
 
 		return $this;
@@ -98,7 +97,7 @@ abstract class BasicField implements Field {
 		return $this->meta['placeholder'];
 	}
 
-	public function set_name( string $name ): self {
+	public function set_name( string $name ): Field {
 		$this->attributes['name'] = $name;
 
 		return $this;
@@ -140,7 +139,7 @@ abstract class BasicField implements Field {
 		return $this->attributes['multiple'] ?? false;
 	}
 
-	public function set_disabled(): self {
+	public function set_disabled(): Field {
 		$this->attributes['disabled'] = true;
 
 		return $this;
@@ -150,7 +149,7 @@ abstract class BasicField implements Field {
 		return $this->attributes['disabled'] ?? false;
 	}
 
-	public function set_readonly(): self {
+	public function set_readonly(): Field {
 		$this->attributes['readonly'] = true;
 
 		return $this;
@@ -160,25 +159,25 @@ abstract class BasicField implements Field {
 		return $this->attributes['readonly'] ?? false;
 	}
 
-	public function set_required(): self {
+	public function set_required(): Field {
 		$this->meta['required'] = true;
 
 		return $this;
 	}
 
-	public function add_class( string $class_name ): self {
+	public function add_class( string $class_name ): Field {
 		$this->meta['class'][ $class_name ] = $class_name;
 
 		return $this;
 	}
 
-	public function unset_class( string $class_name ): self {
+	public function unset_class( string $class_name ): Field {
 		unset( $this->meta['class'][ $class_name ] );
 
 		return $this;
 	}
 
-	public function add_data( string $data_name, string $data_value ): self {
+	public function add_data( string $data_name, string $data_value ): Field {
 		if ( ! isset( $this->meta['data'] ) ) {
 			$this->meta['data'] = [];
 		}
@@ -187,7 +186,7 @@ abstract class BasicField implements Field {
 		return $this;
 	}
 
-	public function unset_data( string $data_name ): self {
+	public function unset_data( string $data_name ): Field {
 		unset( $this->meta['data'][ $data_name ] );
 
 		return $this;
@@ -205,7 +204,7 @@ abstract class BasicField implements Field {
 		return $this->default_value;
 	}
 
-	public function set_default_value( string $value ): self {
+	public function set_default_value( string $value ): Field {
 		$this->default_value = $value;
 
 		return $this;
@@ -236,7 +235,7 @@ abstract class BasicField implements Field {
 		return new NoSerialize();
 	}
 
-	public function set_serializer( Serializer $serializer ): self {
+	public function set_serializer( Serializer $serializer ): Field {
 		$this->meta['serializer'] = $serializer;
 
 		return $this;
@@ -251,7 +250,7 @@ abstract class BasicField implements Field {
 	 *
 	 * @see FormWithFields::get_fields()
 	 */
-	public function set_priority( int $priority ): self {
+	public function set_priority( int $priority ): Field {
 		$this->meta['priority'] = $priority;
 
 		return $this;

src/Field/CheckboxField.php

@@ -2,6 +2,8 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Field;
+
 class CheckboxField extends BasicField {
 	const VALUE_TRUE  = 'yes';
 	const VALUE_FALSE = 'no';
@@ -19,7 +21,7 @@ class CheckboxField extends BasicField {
 		return $this->meta['sublabel'];
 	}
 
-	public function set_sublabel( string $value ): self {
+	public function set_sublabel( string $value ): Field {
 		$this->meta['sublabel'] = $value;
 
 		return $this;

src/Field/Header.php

@@ -2,6 +2,8 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Field;
+
 class Header extends NoValueField {
 	public function __construct() {
 		parent::__construct();
@@ -16,7 +18,7 @@ class Header extends NoValueField {
 		return true;
 	}
 
-	public function set_header_size( int $value ): self {
+	public function set_header_size( int $value ): Field {
 		$this->meta['header_size'] = $value;
 
 		return $this;

src/Field/SelectField.php

@@ -2,6 +2,8 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Field;
+
 class SelectField extends BasicField {
 
 	public function get_template_name(): string {
@@ -9,13 +11,13 @@ class SelectField extends BasicField {
 	}
 
 	/** @param string[] $options */
-	public function set_options( array $options ): self {
+	public function set_options( array $options ): Field {
 		$this->meta['possible_values'] = $options;
 
 		return $this;
 	}
 
-	public function set_multiple(): self {
+	public function set_multiple(): Field {
 		$this->attributes['multiple'] = true;
 
 		return $this;

src/Field/Traits/HtmlAttributes.php

@@ -2,6 +2,8 @@
 
 namespace WPDesk\Forms\Field\Traits;
 
+use WPDesk\Forms\Field;
+
 /**
  * Implementation of HTML attributes like id, name, action etc.
  *
@@ -29,13 +31,19 @@ trait HtmlAttributes {
 		);
 	}
 
-	public function set_attribute( string $name, string $value ): self {
+	/**
+	 * @return \WPDesk\Forms\Field|\WPDesk\Forms\Form
+	 */
+	public function set_attribute( string $name, string $value ) {
 		$this->attributes[ $name ] = $value;
 
 		return $this;
 	}
 
-	public function unset_attribute( string $name ): self {
+	/**
+	 * @return \WPDesk\Forms\Field|\WPDesk\Forms\Form
+	 */
+	public function unset_attribute( string $name ) {
 		unset( $this->attributes[ $name ] );
 
 		return $this;