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import type { CacheControl } from '../../server/lib/cache-control'
const timeUnits = [
{ label: 'y', seconds: 31536000 },
{ label: 'w', seconds: 604800 },
{ label: 'd', seconds: 86400 },
{ label: 'h', seconds: 3600 },
{ label: 'm', seconds: 60 },
{ label: 's', seconds: 1 },
]
function humanReadableTimeRounded(seconds: number): string {
// Find the largest fitting unit.
let candidateIndex = timeUnits.length - 1
for (let i = 0; i < timeUnits.length; i++) {
if (seconds >= timeUnits[i].seconds) {
candidateIndex = i
break
}
}
const candidate = timeUnits[candidateIndex]
const value = seconds / candidate.seconds
const isExact = Number.isInteger(value)
// For days and weeks only, check if using the next smaller unit yields an
// exact result.
if (!isExact && (candidate.label === 'd' || candidate.label === 'w')) {
const nextUnit = timeUnits[candidateIndex + 1]
const nextValue = seconds / nextUnit.seconds
if (Number.isInteger(nextValue)) {
return `${nextValue}${nextUnit.label}`
}
}
if (isExact) {
return `${value}${candidate.label}`
}
return `≈${Math.round(value)}${candidate.label}`
}
export function formatRevalidate(cacheControl: CacheControl): string {
const { revalidate } = cacheControl
return revalidate ? humanReadableTimeRounded(revalidate) : ''
}
export function formatExpire(cacheControl: CacheControl): string {
const { expire } = cacheControl
return expire ? humanReadableTimeRounded(expire) : ''
}
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