shouldProcessUrls(preprocessor) {
        const processUrls =
            preprocessor.pluginOptions.processUrls !== undefined
                ? preprocessor.pluginOptions.processUrls
                : this.context.config.processCssUrls;

        delete preprocessor.pluginOptions.processUrls;

        return processUrls;
    }
Determine whether to apply url preprocessing.

@param {Detail} preprocessor
@returns {boolean}