ResourceLoaderLessVarFileModule.php

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<?php
class ResourceLoaderLessVarFileModule extends ResourceLoaderFileModule {
    protected $lessVariables = [];
 
    public function __construct(
        $options = [],
        $localBasePath = null,
        $remoteBasePath = null
    ) {
        if ( isset( $options['lessMessages'] ) ) {
            $this->lessVariables = $options['lessMessages'];
        }
        parent::__construct( $options, $localBasePath, $remoteBasePath );
    }
 
    public function getMessages() {
        // Overload so MessageBlobStore can detect updates to messages and purge as needed.
        return array_merge( $this->messages, $this->lessVariables );
    }
 
    protected function excludeMessagesFromBlob( $blob, $exclusions ) {
        $data = json_decode( $blob, true );
        // unset the LESS variables so that they are not forwarded to JavaScript
        foreach ( $exclusions as $key ) {
            unset( $data[$key] );
        }
        return (object)$data;
    }
 
    protected function getMessageBlob( ResourceLoaderContext $context ) {
        $blob = parent::getMessageBlob( $context );
        return json_encode( $this->excludeMessagesFromBlob( $blob, $this->lessVariables ) );
    }
 
    private static function wrapAndEscapeMessage( $msg ) {
        return str_replace( "'", "\'", CSSMin::serializeStringValue( $msg ) );
    }
 
    protected function getLessVars( ResourceLoaderContext $context ) {
        $blob = parent::getMessageBlob( $context );
        $lessMessages = $this->excludeMessagesFromBlob( $blob, $this->messages );
 
        $vars = parent::getLessVars( $context );
        foreach ( $lessMessages as $msgKey => $value ) {
            $vars['msg-' . $msgKey] = self::wrapAndEscapeMessage( $value );
        }
        return $vars;
    }
}