Add _doing_it_wrong() notices for missing script, style, and script module dependencies

src/wp-includes/class-wp-dependencies.php

@@ -104,6 +104,18 @@ class WP_Dependencies {
 	 */
 	private $queued_before_register = array();
 
+	/**
+	 * List of handles for dependencies encountered which themselves have missing dependencies.
+	 *
+	 * A dependency handle is added to this list when it is discovered to have missing dependencies. At this time, a
+	 * warning is emitted with {@see _doing_it_wrong()}. The handle is then added to this list, so that duplicate
+	 * warnings don't occur.
+	 *
+	 * @since 7.0.0
+	 * @var string[]
+	 */
+	private $dependencies_with_missing_dependencies = array();
+
 	/**
 	 * Processes the items and dependencies.
 	 *
@@ -199,10 +211,22 @@ public function all_deps( $handles, $recursion = false, $group = false ) {
 				continue;
 			}
 
-			$keep_going = true;
+			$keep_going           = true;
+			$missing_dependencies = array();
+			if ( isset( $this->registered[ $handle ] ) && count( $this->registered[ $handle ]->deps ) > 0 ) {
+				$missing_dependencies = array_diff( $this->registered[ $handle ]->deps, array_keys( $this->registered ) );
+			}
 			if ( ! isset( $this->registered[ $handle ] ) ) {
 				$keep_going = false; // Item doesn't exist.
-			} elseif ( $this->registered[ $handle ]->deps && array_diff( $this->registered[ $handle ]->deps, array_keys( $this->registered ) ) ) {
+			} elseif ( count( $missing_dependencies ) > 0 ) {
+				if ( ! in_array( $handle, $this->dependencies_with_missing_dependencies, true ) ) {
+					_doing_it_wrong(
+						get_class( $this ) . '::add',
+						$this->get_dependency_warning_message( $handle, $missing_dependencies ),
+						'7.0.0'
+					);
+					$this->dependencies_with_missing_dependencies[] = $handle;
+				}
 				$keep_going = false; // Item requires dependencies that don't exist.
 			} elseif ( $this->registered[ $handle ]->deps && ! $this->all_deps( $this->registered[ $handle ]->deps, true, $new_group ) ) {
 				$keep_going = false; // Item requires dependencies that don't exist.
@@ -535,4 +559,22 @@ public function get_etag( $load ) {
 		 */
 		return 'W/"' . md5( $etag ) . '"';
 	}
+
+	/**
+	 * Gets a dependency warning message for a handle.
+	 *
+	 * @since 7.0.0
+	 *
+	 * @param string   $handle                     Handle with missing dependencies.
+	 * @param string[] $missing_dependency_handles Missing dependency handles.
+	 * @return string Formatted, localized warning message.
+	 */
+	protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
+		return sprintf(
+			/* translators: 1: Handle, 2: Comma-separated list of missing dependency handles. */
+			__( 'The handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
+			$handle,
+			implode( ', ', $missing_dependency_handles )
+		);
+	}
 }

src/wp-includes/class-wp-script-modules.php

@@ -70,6 +70,17 @@ class WP_Script_Modules {
 		'high',
 	);
 
+	/**
+	 * List of IDs for script modules encountered which have missing dependencies.
+	 *
+	 * An ID is added to this list when it is discovered to have missing dependencies. At this time, a warning is
+	 * emitted with {@see _doing_it_wrong()}. The ID is then added to this list, so that duplicate warnings don't occur.
+	 *
+	 * @since 7.0.0
+	 * @var string[]
+	 */
+	private $modules_with_missing_dependencies = array();
+
 	/**
 	 * Registers the script module if no script module with that script module
 	 * identifier has already been registered.
@@ -722,7 +733,22 @@ private function sort_item_dependencies( string $id, array $import_types, array
 		}
 
 		// If the item requires dependencies that do not exist, fail.
-		if ( count( array_diff( $dependency_ids, array_keys( $this->registered ) ) ) > 0 ) {
+		$missing_dependencies = array_diff( $dependency_ids, array_keys( $this->registered ) );
+		if ( count( $missing_dependencies ) > 0 ) {
+			if ( ! in_array( $id, $this->modules_with_missing_dependencies, true ) ) {
+				_doing_it_wrong(
+					get_class( $this ) . '::register',
+					sprintf(
+						/* translators: 1: Script module ID, 2: Comma-separated list of missing dependency IDs. */
+						__( 'The script module with the ID "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
+						$id,
+						implode( ', ', $missing_dependencies )
+					),
+					'7.0.0'
+				);
+				$this->modules_with_missing_dependencies[] = $id;
+			}
+
 			return false;
 		}
 

src/wp-includes/class-wp-scripts.php

@@ -1164,4 +1164,22 @@ public function reset() {
 		$this->ext_version    = '';
 		$this->ext_handles    = '';
 	}
+
+	/**
+	 * Gets a script-specific dependency warning message.
+	 *
+	 * @since 7.0.0
+	 *
+	 * @param string   $handle                     Script handle with missing dependencies.
+	 * @param string[] $missing_dependency_handles Missing dependency handles.
+	 * @return string Formatted, localized warning message.
+	 */
+	protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
+		return sprintf(
+			/* translators: 1: Script handle, 2: Comma-separated list of missing dependency handles. */
+			__( 'The script with the handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
+			$handle,
+			implode( ', ', $missing_dependency_handles )
+		);
+	}
 }

src/wp-includes/class-wp-styles.php

@@ -493,4 +493,22 @@ public function reset() {
 		$this->concat_version = '';
 		$this->print_html     = '';
 	}
+
+	/**
+	 * Gets a style-specific dependency warning message.
+	 *
+	 * @since 7.0.0
+	 *
+	 * @param string   $handle                     Style handle with missing dependencies.
+	 * @param string[] $missing_dependency_handles Missing dependency handles.
+	 * @return string Formatted, localized warning message.
+	 */
+	protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
+		return sprintf(
+			/* translators: 1: Style handle, 2: Comma-separated list of missing dependency handles. */
+			__( 'The style with the handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
+			$handle,
+			implode( ', ', $missing_dependency_handles )
+		);
+	}
 }

tests/phpunit/tests/dependencies/scripts.php

@@ -4093,4 +4093,33 @@ public function test_print_translations_no_display_no_sourceurl() {
 		$translations_script_data = $wp_scripts->print_translations( 'test-example', false );
 		$this->assertStringNotContainsStringIgnoringCase( 'sourceURL=', $translations_script_data );
 	}
+
+	/**
+	 * Tests that WP_Scripts emits a _doing_it_wrong() notice for missing dependencies.
+	 *
+	 * @ticket 64229
+	 * @covers WP_Dependencies::all_deps
+	 */
+	public function test_wp_scripts_doing_it_wrong_for_missing_dependencies() {
+		$expected_incorrect_usage = 'WP_Scripts::add';
+		$this->setExpectedIncorrectUsage( $expected_incorrect_usage );
+
+		wp_register_script( 'registered-dep', '/registered-dep.js' );
+		wp_enqueue_script( 'main', '/main.js', array( 'registered-dep', 'missing-dep' ) );
+
+		$markup = get_echo( 'wp_print_scripts' );
+		$this->assertStringNotContainsString( 'main.js', $markup, 'Expected script to be absent.' );
+
+		$this->assertArrayHasKey(
+			$expected_incorrect_usage,
+			$this->caught_doing_it_wrong,
+			"Expected $expected_incorrect_usage to trigger a _doing_it_wrong() notice for missing dependency."
+		);
+
+		$this->assertStringContainsString(
+			'The script with the handle "main" was enqueued with dependencies that are not registered: missing-dep',
+			$this->caught_doing_it_wrong[ $expected_incorrect_usage ],
+			'Expected _doing_it_wrong() notice to indicate missing dependencies for enqueued script.'
+		);
+	}
 }

tests/phpunit/tests/dependencies/styles.php

@@ -814,4 +814,36 @@ public function test_source_url_with_concat() {
 
 		$this->assertEqualHTML( $expected, $printed );
 	}
+
+	/**
+	 * Tests that WP_Styles emits a _doing_it_wrong() notice for missing dependencies.
+	 *
+	 * @ticket 64229
+	 * @covers WP_Dependencies::all_deps
+	 */
+	public function test_wp_style_doing_it_wrong_for_missing_dependencies() {
+		$expected_incorrect_usage = 'WP_Styles::add';
+		$this->setExpectedIncorrectUsage( $expected_incorrect_usage );
+
+		wp_enqueue_style(
+			'main-style',
+			'/main-style.css',
+			array( 'missing-style-dep' )
+		);
+
+		$markup = get_echo( 'wp_print_styles' );
+		$this->assertStringNotContainsString( 'main-style.css', $markup, 'Expected style to be absent.' );
+
+		$this->assertArrayHasKey(
+			$expected_incorrect_usage,
+			$this->caught_doing_it_wrong,
+			"Expected $expected_incorrect_usage to trigger a _doing_it_wrong() notice for missing dependency."
+		);
+
+		$this->assertStringContainsString(
+			'The style with the handle "main-style" was enqueued with dependencies that are not registered: missing-style-dep',
+			$this->caught_doing_it_wrong[ $expected_incorrect_usage ],
+			'Expected _doing_it_wrong() notice to indicate missing dependencies for enqueued styles.'
+		);
+	}
 }

tests/phpunit/tests/script-modules/wpScriptModules.php

@@ -2059,7 +2059,7 @@ public function test_script_module_printing_and_dependency_ordering( bool $use_g
 			"Snapshot:\n" . var_export( $actual, true )
 		);
 
-		$deregister( array( 'b', 'c ' ) );
+		$deregister( array( 'b', 'c' ) );
 
 		// Test that registered dependency in footer doesn't place dependant in footer.
 		$register( 'd', '/d.js', array(), '1.0.0', array( 'in_footer' => true ) );
@@ -2312,4 +2312,32 @@ public function test_static_import_dependency_with_dynamic_imports_depending_on_
 			"Expected script modules to match snapshot:\n$script_modules"
 		);
 	}
+
+	/**
+	 * Tests that a missing script module dependency triggers a _doing_it_wrong() notice.
+	 *
+	 * @ticket 64229
+	 * @covers WP_Script_Modules::sort_item_dependencies
+	 */
+	public function test_missing_script_module_dependency_triggers_incorrect_usage() {
+		$expected_incorrect_usage = 'WP_Script_Modules::register';
+		$this->setExpectedIncorrectUsage( $expected_incorrect_usage );
+
+		$this->script_modules->enqueue( 'main-module', '/main-module.js', array( 'missing-mod-dep' ) );
+
+		$markup = get_echo( array( $this->script_modules, 'print_enqueued_script_modules' ) );
+		$this->assertStringNotContainsString( 'main-module.js', $markup, 'Expected script module to be absent.' );
+
+		$this->assertArrayHasKey(
+			$expected_incorrect_usage,
+			$this->caught_doing_it_wrong,
+			'Expected WP_Script_Modules::register to be reported via doing_it_wrong().'
+		);
+
+		// Assert the message mentions the missing dependency handle.
+		$this->assertStringContainsString(
+			'The script module with the ID "main-module" was enqueued with dependencies that are not registered: missing-mod-dep',
+			$this->caught_doing_it_wrong[ $expected_incorrect_usage ]
+		);
+	}
 }