import noop from 'lodash/noop' const enableMarks = process.browser && performance.mark && (process.env.NODE_ENV !== 'production' || new URLSearchParams(location.search).get('marks') === 'true') const perf = process.browser && performance function doMark(name) { perf.mark(`start ${name}`) } function doStop(name) { perf.mark(`end ${name}`) perf.measure(name, `start ${name}`, `end ${name}`) } const mark = enableMarks ? doMark : noop const stop = enableMarks ? doStop : noop export { mark, stop }