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diff --git a/www/wiki/includes/resourceloader/ResourceLoaderOOUIFileModule.php b/www/wiki/includes/resourceloader/ResourceLoaderOOUIFileModule.php
new file mode 100644
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+++ b/www/wiki/includes/resourceloader/ResourceLoaderOOUIFileModule.php
@@ -0,0 +1,98 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * ResourceLoaderFileModule which magically loads the right skinScripts and skinStyles for every
+ * skin, using the specified OOUI theme for each.
+ *
+ * @since 1.30
+ */
+class ResourceLoaderOOUIFileModule extends ResourceLoaderFileModule {
+	use ResourceLoaderOOUIModule;
+
+	public function __construct( $options = [] ) {
+		if ( isset( $options[ 'themeScripts' ] ) ) {
+			$skinScripts = $this->getSkinSpecific( $options[ 'themeScripts' ], 'scripts' );
+			if ( !isset( $options['skinScripts'] ) ) {
+				$options['skinScripts'] = [];
+			}
+			$this->extendSkinSpecific( $options['skinScripts'], $skinScripts );
+		}
+		if ( isset( $options[ 'themeStyles' ] ) ) {
+			$skinStyles = $this->getSkinSpecific( $options[ 'themeStyles' ], 'styles' );
+			if ( !isset( $options['skinStyles'] ) ) {
+				$options['skinStyles'] = [];
+			}
+			$this->extendSkinSpecific( $options['skinStyles'], $skinStyles );
+		}
+
+		parent::__construct( $options );
+	}
+
+	/**
+	 * Helper function to generate values for 'skinStyles' and 'skinScripts'.
+	 *
+	 * @param string $module Module to generate skinStyles/skinScripts for:
+	 *   'core', 'widgets', 'toolbars', 'windows'
+	 * @param string $which 'scripts' or 'styles'
+	 * @return array
+	 */
+	private function getSkinSpecific( $module, $which ) {
+		$themes = self::getSkinThemeMap();
+
+		return array_combine(
+			array_keys( $themes ),
+			array_map( function ( $theme ) use ( $module, $which ) {
+				if ( $which === 'scripts' ) {
+					return $this->getThemeScriptsPath( $theme, $module );
+				} else {
+					return $this->getThemeStylesPath( $theme, $module );
+				}
+			}, array_values( $themes ) )
+		);
+	}
+
+	/**
+	 * Prepend the $extraSkinSpecific assoc. array to the $skinSpecific assoc. array.
+	 * Both of them represent a 'skinScripts' or 'skinStyles' definition.
+	 *
+	 * @param array &$skinSpecific
+	 * @param array $extraSkinSpecific
+	 */
+	private function extendSkinSpecific( &$skinSpecific, $extraSkinSpecific ) {
+		// For each skin where skinStyles/skinScripts are defined, add our ones at the beginning
+		foreach ( $skinSpecific as $skin => $files ) {
+			if ( !is_array( $files ) ) {
+				$files = [ $files ];
+			}
+			if ( isset( $extraSkinSpecific[$skin] ) ) {
+				$skinSpecific[$skin] = array_merge( [ $extraSkinSpecific[$skin] ], $files );
+			} elseif ( isset( $extraSkinSpecific['default'] ) ) {
+				$skinSpecific[$skin] = array_merge( [ $extraSkinSpecific['default'] ], $files );
+			}
+		}
+		// Add our remaining skinStyles/skinScripts for skins that did not have them defined
+		foreach ( $extraSkinSpecific as $skin => $file ) {
+			if ( !isset( $skinSpecific[$skin] ) ) {
+				$skinSpecific[$skin] = $file;
+			}
+		}
+	}
+}