@lipemat/js-boilerplate/lib/clean-css-loader.js

Dependencies and scripts for a no config JavaScript app

import CleanCSS from 'clean-css';
/**
 * Use clean-css to minify any CSS files being loaded.
 *
 * Does not apply to .pcss files, just .css files being imported.
 *
 * Inspired by abandoned "clean-css-loader"
 * - Simplified by not supporting options.
 * - Fix missing `loader-utils` dependency.
 * - Under our control.
 *
 * @link https://github.com/retyui/clean-css-loader
 */
export default function cleanCssLoader(content, ...args) {
    const callback = this.async();
    const clean = new CleanCSS({
        level: 2,
        returnPromise: true,
        sourceMap: false,
    });
    clean.minify(content)
        .then(output => {
        if (Array.isArray(output.warnings)) {
            output.warnings.forEach(warning => {
                this.emitWarning(new Error(warning));
            });
        }
        return callback(null, output.styles, ...args);
    })
        .catch(callback);
}
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