salix/print/report/letter-debtor-st/assets/css/index.js

const CssReader = require(`${appPath}/lib/cssReader`);

module.exports = new CssReader([
    `${appPath}/common/css/layout.css`,
    `${appPath}/common/css/email.css`,
    `${appPath}/common/css/misc.css`])
    .mergeStyles();