export default function customMetricPlugin(btools) btools.registerMetric('customFPS', () => return measureFrameRate(); );
Use Deep mode in staging, Light in dev, disable in production (automatic with NODE_ENV=production ). 7. CLI Reference btools-v5 profile --url http://localhost:3000 --duration 10s btools-v5 snapshot --selector .app --output ./snap btools-v5 doctor # checks config & compatibility btools-v5 clean # removes all .btools cache 8. Extending with Plugins Plugin API example (custom metric collector): FE Btools V5 -NEW VERSION-
export default 'full' target: 'es2022', injectRuntime: true, plugins: ['dom-viz', 'state-sniffer'], output: reports: './.btools/reports', timeline: './.btools/timeline.json' export default function customMetricPlugin(btools) btools
: