describe-heavy do not run some test suits in yoshi watch mode (or wallaby) this: require('describe-heavy'); describe.heavy('my thing', function () { //your stuff...}); turns into this: describe('my thing', function () { if (!process.env.WIX_NODE_BUILD_WATCH_MODE) { //your stuff... }}); that is all. installing available via npm: $ npm install --save-dev describe-heavy