26 lines
591 B
JavaScript
26 lines
591 B
JavaScript
import { thunk } from './thunk'
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// Lazily invoke because URLSearchParams isn't supported in Edge 16,
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// so we need the polyfill.
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const enabled = thunk(() => process.browser &&
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performance.mark &&
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(
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process.env.NODE_ENV !== 'production' ||
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new URLSearchParams(location.search).get('marks') === 'true'
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)
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)
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const perf = process.browser && performance
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export function mark (name) {
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if (enabled()) {
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perf.mark(`start ${name}`)
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}
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}
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export function stop (name) {
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if (enabled()) {
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perf.mark(`end ${name}`)
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perf.measure(name, `start ${name}`, `end ${name}`)
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}
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}
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