// import settings from default config file let properties = null; const originalConfigFn = require("./karma.conf.js"); originalConfigFn({ set: function (arg) { properties = arg; }, }); // pass `--grep '[live data]'` to mocha to only run live data tests properties.client.args = ["--grep", "[live data]]"]; // export settings module.exports = function (config) { config.set(properties); };