154       ttl,
273     this.ttl = ttl || maxAge || 0
274     if (this.ttl) {
275       if (!isPosInt(this.ttl)) {
277           'ttl must be a positive integer if specified'
284     if (this.max === 0 && this.ttl === 0 && this.maxSize === 0) {
286         'At least one of max, maxSize, or ttl is required'
304       deprecatedOption('maxAge', 'ttl')
319     this.setItemTTL = (index, ttl, start = perf.now()) => {  argument
320       this.starts[index] = ttl !== 0 ? start : 0
321       this.ttls[index] = ttl
322       if (ttl !== 0 && this.ttlAutopurge) {
327         }, ttl + 1)
341         status.ttl = this.ttls[index]
344         status.remainingTTL = status.now + status.ttl - status.start
628         entry.ttl = this.ttls[i]
662       ttl = this.ttl,  property
730     if (ttl !== 0 && this.ttl === 0 && !this.ttls) {
734       this.setItemTTL(index, ttl, start)
961       ttl = this.ttl,  property
991       ttl,  property