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declare global {
interface Window {
__NEXT_HMR_LATENCY_CB: ((latencyMs: number) => void) | undefined
}
}
/**
* Logs information about a completed HMR to the console, the server (via a
* `client-hmr-latency` event), and to `self.__NEXT_HMR_LATENCY_CB` (a debugging
* hook).
*
* @param hasUpdate Set this to `false` to avoid reporting the HMR event via a
* `client-hmr-latency` event or to `self.__NEXT_HMR_LATENCY_CB`. Used by
* turbopack when we must report a message to the browser console (because we
* already logged a "rebuilding" message), but it's not a real HMR, so we
* don't want to impact our telemetry.
*/
export default function reportHmrLatency(
sendMessage: (message: string) => void,
updatedModules: ReadonlyArray<string | number>,
startMsSinceEpoch: number,
endMsSinceEpoch: number,
hasUpdate: boolean = true
) {
const latencyMs = endMsSinceEpoch - startMsSinceEpoch
console.log(`[Fast Refresh] done in ${latencyMs}ms`)
if (!hasUpdate) {
return
}
sendMessage(
JSON.stringify({
event: 'client-hmr-latency',
id: window.__nextDevClientId,
startTime: startMsSinceEpoch,
endTime: endMsSinceEpoch,
page: window.location.pathname,
updatedModules,
// Whether the page (tab) was hidden at the time the event occurred.
// This can impact the accuracy of the event's timing.
isPageHidden: document.visibilityState === 'hidden',
})
)
if (self.__NEXT_HMR_LATENCY_CB) {
self.__NEXT_HMR_LATENCY_CB(latencyMs)
}
}
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