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fix(core): use window.performance for compatibility in JSDOM (fix #9698) #9700

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merged 1 commit into from
Mar 15, 2019
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fix(core): use window.performance for compatibility in JSDOM (fix #9698) #9700

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22 changes: 12 additions & 10 deletions src/core/observer/scheduler.js
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Original file line number Diff line number Diff line change
Expand Up @@ -47,16 +47,18 @@ let getNow: () => number = Date.now
// timestamp can either be hi-res (relative to page load) or low-res
// (relative to UNIX epoch), so in order to compare time we have to use the
// same timestamp type when saving the flush timestamp.
if (
inBrowser &&
window.performance &&
typeof performance.now === 'function' &&
document.createEvent('Event').timeStamp <= performance.now()
) {
// if the event timestamp is bigger than the hi-res timestamp
// (which is evaluated AFTER) it means the event is using a lo-res timestamp,
// and we need to use the lo-res version for event listeners as well.
getNow = () => performance.now()
if (inBrowser) {
const performance = window.performance
if (
performance &&
typeof performance.now === 'function' &&
document.createEvent('Event').timeStamp <= performance.now()
) {
// if the event timestamp is bigger than the hi-res timestamp
// (which is evaluated AFTER) it means the event is using a lo-res timestamp,
// and we need to use the lo-res version for event listeners as well.
getNow = () => performance.now()
}
}

/**
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