feat: add strong typing to the package

.editorconfig

+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+# Configuration for PhpStorm
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 4
+tab_width = 4
+ij_continuation_indent_size = 4
+
+[*.scss]
+ij_scss_enforce_quotes_on_format = true
+ij_scss_hex_color_long_format = true
+ij_scss_hex_color_lower_case = true
+
+[{*.cjs,*.js}]
+indent_style = space
+indent_size = 2
+ij_javascript_do_while_brace_force = always
+ij_javascript_if_brace_force = always
+ij_javascript_import_sort_module_name = true
+ij_javascript_reformat_c_style_comments = true
+ij_javascript_space_after_unary_not = true
+ij_javascript_space_before_unary_not = true
+ij_javascript_spaces_within_array_initializer_brackets = true
+ij_javascript_spaces_within_brackets = true
+ij_javascript_spaces_within_catch_parentheses = true
+ij_javascript_spaces_within_for_parentheses = true
+ij_javascript_spaces_within_if_parentheses = true
+ij_javascript_spaces_within_imports = true
+ij_javascript_spaces_within_interpolation_expressions = true
+ij_javascript_spaces_within_method_call_parentheses = true
+ij_javascript_spaces_within_method_parentheses = true
+ij_javascript_spaces_within_object_literal_braces = true
+ij_javascript_spaces_within_parentheses = true
+ij_javascript_spaces_within_switch_parentheses = true
+ij_javascript_spaces_within_while_parentheses = true
+ij_javascript_while_brace_force = always
+
+[{*.ctp,*.hphp,*.inc,*.module,*.php,*.php4,*.php5,*.phtml}]
+ij_php_align_assignments = true
+ij_php_align_class_constants = true
+ij_php_align_key_value_pairs = true
+ij_php_align_phpdoc_comments = true
+ij_php_align_phpdoc_param_names = true
+ij_php_class_brace_style = end_of_line
+ij_php_comma_after_last_array_element = true
+ij_php_else_if_style = combine
+ij_php_force_short_declaration_array_style = true
+ij_php_getters_setters_naming_style = snake_case
+ij_php_if_brace_force = always
+ij_php_lower_case_boolean_const = true
+ij_php_lower_case_null_const = true
+ij_php_method_brace_style = end_of_line
+ij_php_phpdoc_blank_line_before_tags = true
+ij_php_phpdoc_blank_lines_around_parameters = true
+ij_php_phpdoc_keep_blank_lines = false
+ij_php_phpdoc_wrap_long_lines = true
+ij_php_space_after_type_cast = true
+ij_php_space_after_unary_not = true
+ij_php_space_before_unary_not = true
+ij_php_spaces_around_var_within_brackets = true
+ij_php_spaces_within_array_initializer_braces = true
+ij_php_spaces_within_catch_parentheses = true
+ij_php_spaces_within_for_parentheses = true
+ij_php_spaces_within_if_parentheses = true
+ij_php_spaces_within_method_call_parentheses = true
+ij_php_spaces_within_method_parentheses = true
+ij_php_spaces_within_parentheses = true
+ij_php_spaces_within_switch_parentheses = true
+ij_php_spaces_within_while_parentheses = true
+ij_php_ternary_operation_signs_on_next_line = true
+ij_php_variable_naming_style = snake_case
+
+[{*.htm,*.html,*.ng,*.sht,*.shtm,*.shtml}]
+ij_html_add_new_line_before_tags = div,p,a
+ij_html_align_attributes = false
+ij_html_do_not_indent_children_of_tags = html,thead,tbody,tfoot
+ij_html_new_line_after_last_attribute = when multiline
+ij_html_space_inside_empty_tag = true
+ij_html_uniform_ident = true

.env.testing

+WP_ROOT_FOLDER="${APACHE_DOCUMENT_ROOT}"
+TEST_SITE_WP_ADMIN_PATH="/wp-admin"
+TEST_SITE_DB_NAME="wptest"
+TEST_SITE_DB_HOST="mysqltests"
+TEST_SITE_DB_USER="mysql"
+TEST_SITE_DB_PASSWORD="mysql"
+TEST_SITE_TABLE_PREFIX="wp_"
+TEST_DB_NAME="wptest"
+TEST_DB_HOST="mysqltests"
+TEST_DB_USER="mysql"
+TEST_DB_PASSWORD="mysql"
+TEST_TABLE_PREFIX="wp_"
+TEST_SITE_WP_URL="http://${WOOTESTS_IP}"
+TEST_SITE_WP_DOMAIN="${WOOTESTS_IP}"
+TEST_SITE_ADMIN_EMAIL="grola@seostudio.pl"
+TEST_SITE_ADMIN_USERNAME="admin"
+TEST_SITE_ADMIN_PASSWORD="admin"

.gitignore

@@ -3,3 +3,4 @@
 composer.lock
 build-coverage
 swagger
+.phpcs-cache

composer.json

@@ -24,10 +24,11 @@
 	},
 	"require-dev": {
 		"phpunit/phpunit": "<7",
-    "wp-coding-standards/wpcs": "^0.14.1",
-    "squizlabs/php_codesniffer": "^3.0.2",
-    "mockery/mockery": "*",
-    "10up/wp_mock": "*"
+		"phpstan/phpstan": "^0.12",
+		"wpdesk/wp-code-sniffer": "^1.2.3",
+		"10up/wp_mock": "*",
+		"szepeviktor/phpstan-wordpress": "^0.7.7",
+		"phpstan/extension-installer": "^1.1"
 	},
 	"autoload": {
 		"psr-4": {

phpcs.xml.dist

+<?xml version="1.0"?>
+<ruleset name="WordPress Coding Standards for WP Desk Plugin">
+
+	<!--
+	#############################################################################
+	COMMAND LINE ARGUMENTS
+	https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml
+	#############################################################################
+	-->
+
+	<!-- Scan all files. -->
+	<file>./src</file>
+	<file>./templates</file>
+
+	<!-- Only check PHP files. -->
+	<arg name="extensions" value="php"/>
+
+	<!-- Show progress, show the error codes for each message (source). -->
+	<arg value="sp"/>
+
+	<!-- Check up to 8 files simultaneously. -->
+	<arg name="parallel" value="8"/>
+
+	<!-- Cache outcomes for better performance. Remember to add the file to .gitignore. -->
+	<arg name="cache" value="./.phpcs-cache"/>
+
+	<!--
+	#############################################################################
+	USE THE WPDeskCS RULESET
+	#############################################################################
+	-->
+
+	<!-- Define plugin text domain for i18n. -->
+	<config name="text_domain" value="shopmagic-for-woocommerce"/>
+
+	<!-- This value should be aligned with WordPress support version declared in plugin header -->
+	<config name="minimum_supported_wp_version" value="5.0"/>
+
+	<!-- Set value aligned with supported PHP Version for PHPCompatibilityWP check. -->
+	<config name="testVersion" value="7.0-"/>
+
+	<rule ref="WPDeskPlugin"/>
+
+	<rule ref="Squiz.Commenting.ClassComment.Missing">
+		<exclude name="Squiz.Commenting.ClassComment.Missing"/>
+	</rule>
+
+</ruleset>

phpstan.neon.dist

+parameters:
+    level: max
+    paths:
+        - src/

phpunit-integration.xml

@@ -13,11 +13,5 @@
         </whitelist>
     </filter>
 
-    <logging>
-        <log type="junit" target="build-coverage/report.junit.xml"/>
-        <log type="coverage-html" target="build-coverage/coverage" charset="UTF-8" yui="true" highlight="true"/>
-        <log type="coverage-text" target="build-coverage/coverage.txt"/>
-        <log type="coverage-clover" target="build-coverage/clover.xml"/>
-    </logging>
 
 </phpunit>
\ No newline at end of file

src/ContainerForm.php

@@ -2,7 +2,6 @@
 
 namespace WPDesk\Forms;
 
-
 use Psr\Container\ContainerInterface;
 use WPDesk\Persistence\PersistentContainer;
 
@@ -12,18 +11,12 @@ use WPDesk\Persistence\PersistentContainer;
  * @package WPDesk\Forms
  */
 interface ContainerForm {
-	/**
-	 * @param ContainerInterface $data
-	 *
-	 * @return void
-	 */
-	public function set_data( $data );
+	/** @return void */
+	public function set_data( ContainerInterface $data );
 
 	/**
 	 * Put data from form into a container.
 	 *
-	 * @param PersistentContainer $container Target container.
-	 *
 	 * @return void
 	 */
 	public function put_data( PersistentContainer $container );

src/Escaper.php

@@ -3,10 +3,6 @@
 namespace WPDesk\Forms;
 
 interface Escaper {
-	/**
-	 * @param mixed $value
-	 *
-	 * @return string
-	 */
-	public function escape( $value );
+	/** @param mixed $value */
+	public function escape( $value ): string;
 }

src/Field.php

@@ -2,8 +2,6 @@
 
 namespace WPDesk\Forms;
 
-use WPDesk\Forms\Field\BasicField;
-
 /**
  * The idea is that from the moment the factory returns this interface it's values cannot be changed.
  * And that is why here are only the getters.
@@ -13,157 +11,88 @@ use WPDesk\Forms\Field\BasicField;
  * @package WPDesk\Forms
  */
 interface Field {
-	/** @return string */
-	public function get_name();
+	public function get_name(): string;
 
 	/** @return mixed */
 	public function get_default_value();
 
-	/** @return string */
-	public function get_template_name();
+	public function get_template_name(): string;
 
-	/**
-	 * When this field is used on form this field will force it's own template.
-	 *
-	 * return bool
-	 */
-	public function should_override_form_template();
+	/** When this field is used on form this field will force it's own template. */
+	public function should_override_form_template(): bool;
 
-	/**
-	 * HTML label.
-	 *
-	 * @return string
-	 */
-	public function get_label();
+	/** HTML label. */
+	public function get_label(): string;
 
-	/** bool */
-	public function has_label();
+	public function has_label(): bool;
 
-	/**
-	 * Description for field. It can be shown near the field.
-	 *
-	 * @return string
-	 */
-	public function get_description();
+	public function get_description(): string;
 
-	/**
-	 * Additional field description that should be shown in optional hover tip.
-	 *
-	 * @return string
-	 */
-	public function get_description_tip();
+	/** Additional field description that should be shown in optional hover tip. */
+	public function get_description_tip(): string;
 
-	/** @return bool */
-	public function has_description_tip();
+	public function has_description_tip(): bool;
 
-	/** @return bool */
-	public function has_description();
+	public function has_description(): bool;
 
-	/**
-	 * @return bool
-	 */
-	public function is_readonly();
+	public function is_readonly(): bool;
 
-	/** @return bool */
-	public function is_disabled();
+	public function is_disabled(): bool;
 
-	/** @return string */
-	public function get_id();
+	public function get_id(): string;
 
-	/** @bool */
-	public function is_required();
+	public function is_required(): bool;
 
-	/** @return bool */
-	public function has_placeholder();
+	public function has_placeholder(): bool;
 
-	/** @return string */
-	public function get_placeholder();
+	public function get_placeholder(): string;
 
 	/**
 	 * @param string[] $except
 	 *
 	 * @return string[] name->value
 	 */
-	public function get_attributes( $except = [] );
+	public function get_attributes( array $except = [] ): array;
 
 	/**
 	 * @param string  $name
-	 * @param string $default
+	 * @param ?string $default
 	 *
 	 * @return string
 	 */
-	public function get_attribute( $name, $default = null );
+	public function get_attribute( string $name, $default = null ): string;
 
-	/** @return bool */
-	public function is_attribute_set( $name );
+	public function is_attribute_set( string $name ): bool;
 
-	/**
-	 * @param string $name
-	 *
-	 * @return string
-	 */
-	public function get_meta_value( $name );
+	public function get_meta_value( string $name ): string;
 
-	/** @return bool */
-	public function is_meta_value_set( $name );
+	public function is_meta_value_set( string $name ): bool;
 
-	/**
-	 * @return string
-	 */
-	public function get_classes();
+	public function get_classes(): string;
 
-	/** bool */
-	public function has_classes();
+	public function has_classes(): bool;
 
-	/** @return bool */
-	public function is_class_set( $name );
+	public function is_class_set( string $name ): bool;
 
-	/** bool */
-	public function has_data();
+	public function has_data(): bool;
 
-	/**
-	 * @return array
-	 */
-	public function get_data();
+	/** @return array<string,int> */
+	public function get_data(): array;
 
-	/**
-	 * @param string $data_name
-	 * @param string $data_value
-	 *
-	 * @return $this
-	 */
-	public function add_data( $data_name, $data_value );
+	public function add_data( string $data_name, string $data_value ): self;
 
-	/**
-	 * @param string $data_name
-	 *
-	 * @return $this
-	 */
-	public function unset_data( $data_name );
+	public function unset_data( string $data_name ): self;
 
-	/**
-	 * @return mixed
-	 */
+	/** @return mixed */
 	public function get_possible_values();
 
-	/**
-	 * @return bool
-	 */
-	public function is_multiple();
+	public function is_multiple(): bool;
 
-	/**
-	 * @return Validator
-	 */
-	public function get_validator();
+	public function get_validator(): Validator;
 
-	/**
-	 * @return Sanitizer
-	 */
-	public function get_sanitizer();
+	public function get_sanitizer(): Sanitizer;
 
-	/** @return Serializer */
-	public function get_serializer();
+	public function get_serializer(): Serializer;
 
-	/** @return int */
-	public function get_priority();
+	public function get_priority(): int;
 }

src/Field/BasicField.php

@@ -4,9 +4,11 @@ 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;
 use WPDesk\Forms\Serializer\NoSerialize;
+use WPDesk\Forms\Validator;
 use WPDesk\Forms\Validator\ChainValidator;
 use WPDesk\Forms\Validator\RequiredValidator;
 
@@ -19,209 +21,164 @@ use WPDesk\Forms\Validator\RequiredValidator;
 abstract class BasicField implements Field {
 	use Field\Traits\HtmlAttributes;
 
-	/** @var array[] */
+	const DEFAULT_PRIORITY = 10;
+
+	/** @var array<string,int,bool> */
 	protected $meta;
 
+	/** @var string */
 	protected $default_value;
 
 	public function __construct() {
 		$this->meta['class']    = [];
-		$this->meta['priority'] = 10;
+		$this->meta['priority'] = self::DEFAULT_PRIORITY;
 	}
 
-	public function get_label() {
+	public function get_label(): string {
 		return $this->meta['label'];
 	}
 
-	/**
-	 * @param string $value
-	 *
-	 * @return $this
-	 */
-	public function set_label( $value ) {
+	public function set_label( string $value ): self {
 		$this->meta['label'] = $value;
 
 		return $this;
 	}
 
-	public function get_description_tip() {
+	public function get_description_tip(): string {
 		return $this->meta['description_tip'];
 	}
 
-	public function has_description_tip() {
+	public function has_description_tip(): bool {
 		return isset( $this->meta['description_tip'] );
 	}
 
-	public function should_override_form_template() {
-		return isset( $this->attributes['overrite_template'] ) ? $this->attributes['overrite_template'] : false;
+	public function should_override_form_template(): bool {
+		return $this->attributes['overrite_template'] ?? false;
 	}
 
-	public function get_description() {
+	public function get_description(): string {
 		return $this->meta['description'];
 	}
 
-	public function has_label() {
+	public function has_label(): bool {
 		return isset( $this->meta['label'] );
 	}
 
-	public function has_description() {
+	public function has_description(): bool {
 		return isset( $this->meta['description'] );
 	}
 
-	public function set_description( $value ) {
+	public function set_description( string $value ): self {
 		$this->meta['description'] = $value;
 
 		return $this;
 	}
 
-	public function set_description_tip( $value ) {
+	public function set_description_tip( string $value ): self {
 		$this->meta['description_tip'] = $value;
 
 		return $this;
 	}
 
-	/**
-	 * @return array
-	 *
-	 * @deprecated not sure if needed. TODO: Check later.
-	 */
-	public function get_type() {
+	public function get_type(): string {
 		return $this->attributes['type'];
 	}
 
-	/**
-	 * @param string $value
-	 *
-	 * @return $this
-	 */
-	public function set_placeholder( $value ) {
+	public function set_placeholder( string $value ): self {
 		$this->meta['placeholder'] = $value;
 
 		return $this;
 	}
 
-	public function has_placeholder() {
+	public function has_placeholder(): bool {
 		return isset( $this->meta['placeholder'] );
 	}
 
-	public function get_placeholder() {
+	public function get_placeholder(): string {
 		return $this->meta['placeholder'];
 	}
 
-	/**
-	 * @param string $name
-	 *
-	 * @return $this
-	 */
-	public function set_name( $name ) {
+	public function set_name( string $name ): self {
 		$this->attributes['name'] = $name;
 
 		return $this;
 	}
 
-	public function get_meta_value( $name ) {
+	public function get_meta_value( string $name ): string {
 		return $this->meta[ $name ];
 	}
 
-	public function get_classes() {
+	public function get_classes(): string {
 		return implode( ' ', $this->meta['class'] );
 	}
 
-	public function has_classes() {
+	public function has_classes(): bool {
 		return ! empty( $this->meta['class'] );
 	}
 
-	public function has_data() {
+	public function has_data(): bool {
 		return ! empty( $this->meta['data'] );
 	}
 
-	/**
-	 * @return array
-	 */
-	public function get_data() {
-		return empty( $this->meta['data'] ) ? [] : $this->meta['data'];
+	public function get_data(): array {
+		return $this->meta['data'] ?: [];
 	}
 
 	public function get_possible_values() {
 		return isset( $this->meta['possible_values'] ) ? $this->meta['possible_values'] : [];
 	}
 
-	public function get_id() {
-		return isset( $this->attributes['id'] ) ? $this->attributes['id'] : sanitize_title( $this->get_name() );
+	public function get_id(): string {
+		return $this->attributes['id'] ?? sanitize_title( $this->get_name() );
 	}
 
-	public function get_name() {
+	public function get_name(): string {
 		return $this->attributes['name'];
 	}
 
-	public function is_multiple() {
-		return isset( $this->attributes['multiple'] ) ? $this->attributes['multiple'] : false;
+	public function is_multiple(): bool {
+		return $this->attributes['multiple'] ?? false;
 	}
 
-	/**
-	 * @return $this
-	 */
-	public function set_disabled() {
+	public function set_disabled(): self {
 		$this->attributes['disabled'] = true;
 
 		return $this;
 	}
 
-	public function is_disabled() {
-		return isset( $this->attributes['disabled'] ) ? $this->attributes['disabled'] : false;
+	public function is_disabled(): bool {
+		return $this->attributes['disabled'] ?? false;
 	}
 
-	/**
-	 * @return $this
-	 */
-	public function set_readonly() {
+	public function set_readonly(): self {
 		$this->attributes['readonly'] = true;
 
 		return $this;
 	}
 
-	public function is_readonly() {
-		return isset( $this->attributes['readonly'] ) ? $this->attributes['readonly'] : false;
+	public function is_readonly(): bool {
+		return $this->attributes['readonly'] ?? false;
 	}
 
-	/**
-	 * @return $this
-	 */
-	public function set_required() {
+	public function set_required(): self {
 		$this->meta['required'] = true;
 
 		return $this;
 	}
 
-	/**
-	 * @param string $class_name
-	 *
-	 * @return $this
-	 */
-	public function add_class( $class_name ) {
+	public function add_class( string $class_name ): self {
 		$this->meta['class'][ $class_name ] = $class_name;
 
 		return $this;
 	}
 
-	/**
-	 * @param string $class_name
-	 *
-	 * @return $this
-	 */
-	public function unset_class( $class_name ) {
+	public function unset_class( string $class_name ): self {
 		unset( $this->meta['class'][ $class_name ] );
 
 		return $this;
 	}
 
-	/**
-	 * @param string $data_name
-	 * @param string $data_value
-	 *
-	 * @return $this
-	 */
-	public function add_data( $data_name, $data_value ) {
+	public function add_data( string $data_name, string $data_value ): self {
 		if ( ! isset( $this->meta['data'] ) ) {
 			$this->meta['data'] = [];
 		}
@@ -230,44 +187,31 @@ abstract class BasicField implements Field {
 		return $this;
 	}
 
-	/**
-	 * @param string $data_name
-	 *
-	 * @return $this
-	 */
-	public function unset_data( $data_name ) {
+	public function unset_data( string $data_name ): self {
 		unset( $this->meta['data'][ $data_name ] );
 
 		return $this;
 	}
 
-	public function is_meta_value_set( $name ) {
+	public function is_meta_value_set( string $name ): bool {
 		return isset( $this->meta[ $name ] );
 	}
 
-	public function is_class_set( $name ) {
+	public function is_class_set( string $name ): bool {
 		return isset( $this->meta['class'][ $name ] );
 	}
 
-	public function get_default_value() {
+	public function get_default_value(): string {
 		return $this->default_value;
 	}
 
-	/**
-	 * @param string $value
-	 *
-	 * @return $this
-	 */
-	public function set_default_value( $value ) {
+	public function set_default_value( string $value ): self {
 		$this->default_value = $value;
 
 		return $this;
 	}
 
-	/**
-	 * @return ChainValidator
-	 */
-	public function get_validator() {
+	public function get_validator(): Validator {
 		$chain = new ChainValidator();
 		if ( $this->is_required() ) {
 			$chain->attach( new RequiredValidator() );
@@ -276,18 +220,15 @@ abstract class BasicField implements Field {
 		return $chain;
 	}
 
-	public function is_required() {
-		return isset( $this->meta['required'] ) ? $this->meta['required'] : false;
+	public function is_required(): bool {
+		return $this->meta['required'] ?? false;
 	}
 
-	public function get_sanitizer() {
+	public function get_sanitizer(): Sanitizer {
 		return new NoSanitize();
 	}
 
-	/**
-	 * @return Serializer
-	 */
-	public function get_serializer() {
+	public function get_serializer(): Serializer {
 		if ( isset( $this->meta['serializer'] ) && $this->meta['serializer'] instanceof Serializer ) {
 			return $this->meta['serializer'];
 		}
@@ -295,7 +236,7 @@ abstract class BasicField implements Field {
 		return new NoSerialize();
 	}
 
-	public function set_serializer( Serializer $serializer ) {
+	public function set_serializer( Serializer $serializer ): self {
 		$this->meta['serializer'] = $serializer;
 
 		return $this;

src/Field/ButtonField.php

@@ -2,14 +2,12 @@
 
 namespace WPDesk\Forms\Field;
 
-class ButtonField extends NoValueField
-{
-    public function get_template_name()
-    {
+class ButtonField extends NoValueField {
+
+	public function get_template_name(): string {
 		return 'button';
 	}
-    public function get_type()
-    {
+	public function get_type(): string {
 		return 'button';
 	}
 }

src/Field/CheckboxField.php

@@ -2,7 +2,6 @@
 
 namespace WPDesk\Forms\Field;
 
-
 class CheckboxField extends BasicField {
 	const VALUE_TRUE  = 'yes';
 	const VALUE_FALSE = 'no';
@@ -12,21 +11,21 @@ class CheckboxField extends BasicField {
 		$this->set_attribute( 'type', 'checkbox' );
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-checkbox';
 	}
 
-	public function get_sublabel() {
+	public function get_sublabel(): string {
 		return $this->meta['sublabel'];
 	}
 
-	public function set_sublabel( $value ) {
+	public function set_sublabel( string $value ): self {
 		$this->meta['sublabel'] = $value;
 
 		return $this;
 	}
 
-	public function has_sublabel() {
+	public function has_sublabel(): bool {
 		return isset( $this->meta['sublabel'] );
 	}
 }

src/Field/DatePickerField.php

@@ -2,6 +2,7 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Sanitizer;
 use WPDesk\Forms\Sanitizer\TextFieldSanitizer;
 
 class DatePickerField extends BasicField {
@@ -13,11 +14,11 @@ class DatePickerField extends BasicField {
 		$this->set_attribute( 'type', 'text' );
 	}
 
-	public function get_sanitizer() {
+	public function get_sanitizer(): Sanitizer {
 		return new TextFieldSanitizer();
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-date-picker';
 	}
 }

src/Field/Header.php

@@ -8,15 +8,15 @@ class Header extends NoValueField {
 		$this->meta['header_size'] = '';
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'header';
 	}
 
-	public function should_override_form_template() {
+	public function should_override_form_template(): bool {
 		return true;
 	}
 
-	public function set_header_size( $value ) {
+	public function set_header_size( int $value ): self {
 		$this->meta['header_size'] = $value;
 
 		return $this;

src/Field/HiddenField.php

@@ -2,6 +2,7 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Sanitizer;
 use WPDesk\Forms\Sanitizer\TextFieldSanitizer;
 
 class HiddenField extends BasicField {
@@ -11,11 +12,11 @@ class HiddenField extends BasicField {
 		$this->set_attribute( 'type', 'hidden' );
 	}
 
-	public function get_sanitizer() {
+	public function get_sanitizer(): Sanitizer {
 		return new TextFieldSanitizer();
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-hidden';
 	}
 }

src/Field/ImageInputField.php

@@ -10,10 +10,7 @@ class ImageInputField extends BasicField {
 		$this->set_attribute( 'type', 'text' );
 	}
 
-	/**
-	 * @return string
-	 */
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-image';
 	}
 }

src/Field/InputNumberField.php

@@ -2,6 +2,7 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Sanitizer;
 use WPDesk\Forms\Sanitizer\TextFieldSanitizer;
 
 class InputNumberField extends BasicField {
@@ -11,11 +12,11 @@ class InputNumberField extends BasicField {
 		$this->set_attribute( 'type', 'number' );
 	}
 
-	public function get_sanitizer() {
+	public function get_sanitizer(): Sanitizer {
 		return new TextFieldSanitizer();
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-number';
 	}
 }

src/Field/InputTextField.php

@@ -2,6 +2,7 @@
 
 namespace WPDesk\Forms\Field;
 
+use WPDesk\Forms\Sanitizer;
 use WPDesk\Forms\Sanitizer\TextFieldSanitizer;
 
 class InputTextField extends BasicField {
@@ -11,11 +12,11 @@ class InputTextField extends BasicField {
 		$this->set_attribute( 'type', 'text' );
 	}
 
-	public function get_sanitizer() {
+	public function get_sanitizer(): Sanitizer {
 		return new TextFieldSanitizer();
 	}
 
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-text';
 	}
 }

src/Field/MultipleInputTextField.php

@@ -4,10 +4,7 @@ namespace WPDesk\Forms\Field;
 
 class MultipleInputTextField extends InputTextField {
 
-	/**
-	 * @return string
-	 */
-	public function get_template_name() {
+	public function get_template_name(): string {
 		return 'input-text-multiple';
 	}
 }