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export function memo<T>(fn: () => T, cleanup?: (input: T) => Promise<void>) {
let value: T | undefined
let loaded = false
const result = (): T => {
if (loaded) return value as T
loaded = true
value = fn()
return value as T
}
result.reset = async () => {
if (cleanup && value) await cleanup(value)
loaded = false
value = undefined
}
return result
}
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