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add global callback for refresh latency #25944

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merged 2 commits into from
Jun 9, 2021
Merged

add global callback for refresh latency #25944

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fff1478
add global callback for refresh latency
sokra Jun 9, 2021
c283795
Merge branch 'canary' into feat/latency-callback
ijjk Jun 9, 2021
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9 changes: 8 additions & 1 deletion packages/next/client/dev/error-overlay/hot-dev-client.js
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Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,11 @@ function onFastRefresh(hasUpdates) {
DevOverlay.onRefresh()
}

console.log('[Fast Refresh] done')
const latency = Date.now() - startLatency
console.log(`[Fast Refresh] done in ${latency}ms`)
if (self.__NEXT_HMR_LATENCY_CB) {
self.__NEXT_HMR_LATENCY_CB(latency)
}
}

// There is a newer version of the code available.
Expand All @@ -188,11 +192,14 @@ function handleAvailableHash(hash) {
mostRecentCompilationHash = hash
}

let startLatency = undefined

// Handle messages from the server.
function processMessage(e) {
const obj = JSON.parse(e.data)
switch (obj.action) {
case 'building': {
startLatency = Date.now()
console.log('[Fast Refresh] rebuilding')
break
}
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