typescript 2 nodejs 2 keyed-lock 2 graceful-teardown 2 check-and-abort 1 critical-section 1 event-loop-lock 1 fifo-per-key 1 keyed-mutex 1 keyed-promise-lock 1 lock-by-key 1 mutex 1 mutex-lock 1 promise-lock 1 promises-in-javascript 1 race-condition 1 sequential 1 sequential-per-key 1 sequential-processing 1 async-lock 1 uniform-key-distribution 1 short-term-key-popularity 1 proactive-remove 1 lru-alternative 1 graceful-shutdown 1 get-or-fetch 1 fixed-ttl 1 fifo-cache 1 automatic-fetch 1 automated-value-retrieval 1 automated-fetch 1 auto-fetching 1 auto-fetch 1