3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
10 ## [3.1.2] - 2023-12-17
14 - Wait for queued tasks to end at worker termination.
16 ## [3.1.1] - 2023-12-16
20 - Fix pool options TS type definition.
22 ## [3.1.0] - 2023-12-16
26 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
28 ## [3.0.14] - 2023-12-13
32 - Fix possible null exception with worker_threads pools.
34 ## [3.0.13] - 2023-12-12
38 - Ensure worker choice strategy wait for worker nodes readiness.
42 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
44 ## [3.0.12] - 2023-12-12
48 - Add infinite retries support in worker choice strategy.
50 ## [3.0.11] - 2023-12-11
54 - Ensure pool asynchronous resource properly track tasks execution.
56 ## [3.0.10] - 2023-12-08
60 - Add a fastpath when tasks stealing or redistribution is impossible.
62 ## [3.0.9] - 2023-11-26
66 - Remove all pool events listener at pool destroying.
67 - Remove all worker node events listener at worker node destroying.
68 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
70 ## [3.0.8] - 2023-11-25
74 - Ensure continuous tasks stealing on idle start at worker node idling.
76 ## [3.0.7] - 2023-11-24
80 - Make continuous tasks stealing start at worker node idling.
82 ## [3.0.6] - 2023-11-24
86 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
87 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
89 ## [3.0.5] - 2023-10-27
93 - Ensure pool `ready` event can be emitted only once.
95 ## [3.0.4] - 2023-10-20
99 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
100 - Use builtin retry mechanism in worker choice strategies instead of custom one.
102 ## [3.0.3] - 2023-10-19
106 - Avoid null exception at sending message to worker.
107 - Avoid null exception at checking worker node readiness.
109 ## [3.0.2] - 2023-10-17
113 - Fix race condition at dynamic worker node task assignment and scheduled removal. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468) and [#1496](https://github.com/poolifier/poolifier/issues/1496).
115 ## [3.0.1] - 2023-10-16
119 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
123 - Switch the worker node eventing code to `EventTarget` API.
125 ## [3.0.0] - 2023-10-08
129 - Remove Node.js 16.x.x (EOL) support.
131 ## [2.7.5] - 2023-10-03
135 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
137 ## [2.7.4] - 2023-09-25
141 - Fix source maps (bundler issue).
143 ## [2.7.3] - 2023-09-24
147 - Convert pool event emitter to event emitter async resource.
149 ## [2.7.2] - 2023-09-23
153 - Add source maps to npm package to ease debugging.
157 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
159 ## [2.7.1] - 2023-09-20
163 - Ensure worker message listener used one time are removed after usage.
165 ## [2.7.0] - 2023-09-19
169 - Fix task stealing related tasks queue options handling at runtime.
173 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
177 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
178 - Stricter worker constructor arguments validation.
180 ## [2.6.45] - 2023-09-17
184 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
188 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
189 - Add `start()` method to pool API to start the minimum number of workers.
190 - Add `taskStealing` and `tasksStealingOnPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
191 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
193 ## [2.6.44] - 2023-09-08
197 - Use a dedicated PAT to publish on GitHub packages registry.
201 - Publish on GitHub packages registry on release.
205 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
207 ## [2.6.43] - 2023-09-08
211 - Publish on GitHub packages registry on release.
215 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
217 ## [2.6.42] - 2023-09-06
221 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
223 ## [2.6.41] - 2023-09-03
227 - Optimize worker choice strategies implementation.
229 ## [2.6.40] - 2023-09-01
233 - Do not pre-choose in WRR worker choice strategy to avoid bias.
234 - Avoid array out of bound in worker choice strategies after worker node removal.
236 ## [2.6.39] - 2023-08-30
240 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
242 ## [2.6.38] - 2023-08-30
246 - Bundle typescript types declaration into one file.
250 - Improve interleaved weighted round robin worker choice strategy implementation.
252 ## [2.6.37] - 2023-08-28
256 - Ensure unused worker usage statistics are deleted at runtime.
260 - Rename worker choice strategy options `choiceRetries` to `retries`.
261 - Avoid unnecessary branching in worker choice strategies.
263 ## [2.6.36] - 2023-08-27
267 - Fix pool `execute()` arguments check.
271 - Make continuous tasks stealing algorithm less aggressive.
272 - Fine tune tasks stealing algorithm under back pressure.
274 ## [2.6.35] - 2023-08-25
278 - Don't account worker usage statistics for tasks that have failed.
279 - Fix pool information runtime and wait time median computation.
283 - Update simple moving average implementation to use a circular buffer.
284 - Update simple moving median implementation to use a circular buffer.
285 - Account for stolen tasks in worker usage statistics and pool information.
289 - Continuous tasks stealing algorithm.
291 ## [2.6.34] - 2023-08-24
295 - Avoid cascading tasks stealing under back pressure.
299 - Add fastpath to queued tasks rescheduling.
301 ## [2.6.33] - 2023-08-24
305 - Fix queued tasks rescheduling.
309 - Rename tasks queue options `queueMaxSize` to `size`.
313 - Task stealing scheduling algorithm if tasks queueing is enabled.
315 ## [2.6.32] - 2023-08-23
319 - Ensure no task can be executed when the pool is destroyed.
323 - Add `queueMaxSize` option to tasks queue options.
324 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
325 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
327 ## [2.6.31] - 2023-08-20
331 - Fix worker choice strategy retries mechanism in some edge cases.
335 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
336 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
338 ## [2.6.30] - 2023-08-19
342 - Ensure pool event `backPressure` is emitted.
343 - Ensure pool event `full` is emitted only once.
344 - Ensure worker node cannot be instantiated without proper arguments.
346 ## [2.6.29] - 2023-08-18
350 - Fix race condition between readiness and task functions worker message handling at startup.
351 - Fix duplicate task function worker usage statistics computation per task function.
352 - Update task function worker usage statistics if and only if there's at least two different task functions.
353 - Fix race condition at task function worker usage executing task computation leading to negative value.
357 - Add back pressure detection on the worker node queue. Event `backPressure` is emitted when all worker node queues are full (worker node queue size >= poolMaxSize^2).
358 - Use back pressure detection in worker choice strategies.
359 - Add worker choice strategies retries mechanism if no worker is eligible.
361 ## [2.6.28] - 2023-08-16
365 - Ensure pool workers are properly initialized.
369 - HTTP server pool examples: express-cluster, express-hybrid.
373 - Remove now useless branching in worker hot code path.
375 ## [2.6.27] - 2023-08-15
379 - Add `KillHandler` type definition to exported types.
383 - Add `destroy` event to pool API.
385 ## [2.6.26] - 2023-08-15
389 - Add kill handler to worker options allowing to execute custom code when worker is killed.
390 - Add `listTaskFunctions()` method to pool API.
391 - SMTP client pool example: nodemailer.
393 ## [2.6.25] - 2023-08-13
397 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
398 - WebSocket server pool examples: ws-cluster, ws-hybrid.
400 ## [2.6.24] - 2023-08-12
404 - Add array of transferable objects to the `execute()` method arguments.
405 - WebSocket server pool examples: ws-worker_threads.
407 ## [2.6.23] - 2023-08-11
411 - Fix pool busyness semantic when tasks queueing is enabled: the pool is busy when the number of executing tasks on each worker has reached the maximum tasks concurrency per worker.
415 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
416 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
418 ## [2.6.22] - 2023-08-10
422 - Add missing `types` field to package.json `exports`.
426 - Structure markdown documentation (PR #811).
428 ## [2.6.21] - 2023-08-03
432 - Improve code documentation.
433 - Code refactoring and cleanup for better maintainability and readability.
435 ## [2.6.20] - 2023-07-21
439 - Fix queued tasks redistribution on error task execution starvation.
440 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
444 - Drastically reduce lookups by worker in the worker nodes.
446 ## [2.6.19] - 2023-07-20
450 - Dedicated internal communication channel for worker_threads pools.
452 ## [2.6.18] - 2023-07-19
456 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
458 ## [2.6.17] - 2023-07-16
462 - Add `listTaskFunctions()` method to worker API.
464 ## [2.6.16] - 2023-07-12
468 - Fix pool startup detection.
469 - Fix worker task functions handling.
471 ## [2.6.15] - 2023-07-11
475 - Take into account worker node readiness in worker choice strategies.
477 ## [2.6.14] - 2023-07-10
481 - Fix task function statistics tracking.
483 ## [2.6.13] - 2023-07-10
487 - Add per task function statistics tracking.
488 - Add public methods to manipulate the worker task functions at runtime.
490 ## [2.6.12] - 2023-07-09
494 - Workaround import issue with `node:os` module in node 16.x.x.
496 ## [2.6.11] - 2023-07-09
500 - Fix pool readiness semantic.
502 ## [2.6.10] - 2023-07-08
506 - Ensure workers are not recreated on error at pool startup.
510 - Add `ready` and `strategy` fields to pool information.
511 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
512 - Add dynamic pool sizing checks.
514 ## [2.6.9] - 2023-07-07
518 - Recreate the right worker type on uncaught exception.
522 - Add minimum and maximum to internal measurement statistics.
523 - Add `runTime` and `waitTime` to pool information.
524 - Check worker inactive time only on dynamic worker.
526 ## [2.6.8] - 2023-07-03
530 - Brown paper bag release to fix version handling in pool information.
532 ## [2.6.7] - 2023-07-03
536 - Ensure worker queued tasks at error are reassigned to other pool workers.
540 - Add pool `utilization` ratio to pool information.
541 - Add `version` to pool information.
542 - Add worker information to worker nodes.
544 ## [2.6.6] - 2023-07-01
548 - Add safe helper `availableParallelism()` to help sizing the pool.
552 - Ensure message handler is only registered in worker.
554 ## [2.6.5] - 2023-06-27
558 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
562 - Artificial version bump to 2.6.5 to workaround publication issue.
563 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
564 - Ensure pool event is emitted before task error promise rejection.
565 - Fix queued tasks count computation.
569 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
571 ## [2.6.4] - 2023-06-27
575 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
579 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
580 - Ensure pool event is emitted before task error promise rejection.
581 - Fix queued tasks count computation.
585 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
587 ## [2.6.3] - 2023-06-19
591 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
592 - Update strategies internals after statistics computation.
596 - Optimize O(1) queue implementation.
598 ## [2.6.2] - 2023-06-12
602 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
604 ## [2.6.1] - 2023-06-10
608 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
612 - Fix average statistics computation: ensure failed tasks are not accounted.
614 ## [2.6.0] - 2023-06-09
618 - Add `LEAST_ELU` worker choice strategy (experimental).
619 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
623 - Refactor pool worker node usage internals.
624 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
625 - Breaking change: pool information `info` property object fields have been renamed.
629 - Fix wait time accounting.
630 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
631 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
633 ## [2.5.4] - 2023-06-07
637 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
641 - Compute statistics at the worker level only if needed.
642 - Add `worker_threads` options to thread pool options.
646 - Make the `LEAST_BUSY` strategy only relies on task runtime.
648 ## [2.5.3] - 2023-06-04
652 - Refine pool information content.
653 - Limit pool internals public exposure.
655 ## [2.5.2] - 2023-06-02
659 - Add `taskError` pool event for task execution error.
660 - Add pool information `info` property to pool.
661 - Emit pool information on `busy` and `full` pool events.
663 ## [2.5.1] - 2023-06-01
667 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
668 - Add `error` pool event for uncaught worker error.
670 ## [2.5.0] - 2023-05-31
674 - Switch pool event emitter to `EventEmitterAsyncResource`.
675 - Add tasks wait time accounting in per worker tasks usage.
676 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
680 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
682 ## [2.4.14] - 2023-05-09
686 - Ensure no undefined task runtime can land in the tasks history.
687 - Fix median computation implementation once again.
691 - Unit tests for median and queue implementations.
693 ## [2.4.13] - 2023-05-08
697 - Fix worker choice strategy options validation.
698 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
700 ## [2.4.12] - 2023-05-06
704 - Support multiple task functions per worker.
705 - Add custom worker weights support to worker choice strategies options.
709 - Use O(1) queue implementation for tasks queueing.
713 - Fix median computation implementation.
714 - Fix fair share worker choice strategy internals update.
716 ## [2.4.11] - 2023-04-23
720 - Optimize free worker finding in worker choice strategies.
722 ## [2.4.10] - 2023-04-15
726 - Fix typescript type definition for task function: ensure the input data is optional.
727 - Fix typescript type definition for pool execute(): ensure the input data is optional.
729 ## [2.4.9] - 2023-04-15
733 - Add tasks queue enablement runtime setter to pool.
734 - Add tasks queue options runtime setter to pool.
735 - Add worker choice strategy options runtime setter to pool.
739 - Remove the tasks queuing experimental status.
743 - Fix task function type definition and validation.
744 - Fix worker choice strategy options handling.
746 ## [2.4.8] - 2023-04-12
750 - Fix message between main worker and worker type definition for tasks.
751 - Fix code documentation.
753 ## [2.4.7] - 2023-04-11
757 - Add worker tasks queue options to pool options.
761 - Fix missing documentation.
763 ## [2.4.6] - 2023-04-10
767 - Ensure one task at a time is executed per worker with tasks queueing enabled.
768 - Properly count worker executing tasks with tasks queueing enabled.
770 ## [2.4.5] - 2023-04-09
774 - Use monotonic high resolution timer for worker tasks runtime.
775 - Add worker tasks median runtime to statistics.
776 - Add worker tasks queue (experimental).
778 ## [2.4.4] - 2023-04-07
782 - Add `PoolEvents` enumeration and `PoolEvent` type.
786 - Destroy worker only on alive check.
788 ## [2.4.3] - 2023-04-07
792 - Fix typedoc generation with inheritance.
794 ## [2.4.2] - 2023-04-06
798 - Add `full` event to dynamic pool.
799 - Keep worker choice strategy in memory for conditional reuse.
803 - Fix possible negative worker key at worker removal in worker choice strategies.
805 ## [2.4.1] - 2023-04-05
809 - Optimize worker choice strategy for dynamic pool.
813 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
815 ## [2.4.0] - 2023-04-04
819 - Add `LESS_BUSY` worker choice strategy.
823 - Optimize worker storage in pool.
824 - Optimize worker alive status check.
825 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
826 - Optimize `LESS_USED` worker choice strategy.
827 - Update benchmark versus external threads pools.
828 - Optimize tasks usage statistics requirements for worker choice strategy.
832 - Ensure trimmable characters are checked at pool initialization.
833 - Fix message id integer overflow.
834 - Fix pool worker removal in worker choice strategy internals.
835 - Fix package publication with pnpm.
837 ## [2.4.0-3] - 2023-04-04
841 - Add `LESS_BUSY` worker choice strategy.
845 - Optimize worker storage in pool.
846 - Optimize worker alive status check.
847 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
848 - Optimize `LESS_USED` worker choice strategy.
849 - Update benchmark versus external threads pools.
853 - Ensure trimmable characters are checked at pool initialization.
854 - Fix message id integer overflow.
855 - Fix pool worker removal in worker choice strategy internals.
856 - Fix package publication with pnpm.
858 ## [2.4.0-2] - 2023-04-03
862 - Add `LESS_BUSY` worker choice strategy.
866 - Optimize worker storage in pool.
867 - Optimize worker alive status check.
868 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
869 - Optimize `LESS_USED` worker choice strategy.
873 - Ensure trimmable characters are checked at pool initialization.
874 - Fix message id integer overflow.
875 - Fix pool worker removal in worker choice strategy internals.
876 - Fix package publication with pnpm.
878 ## [2.4.0-1] - 2023-04-03
882 - Add `LESS_BUSY` worker choice strategy.
886 - Optimize worker storage in pool.
887 - Optimize worker alive status check.
888 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
889 - Optimize `LESS_USED` worker choice strategy.
893 - Ensure trimmable characters are checked at pool initialization.
894 - Fix message id integer overflow.
895 - Fix pool worker removal in worker choice strategy internals.
897 ## [2.4.0-0] - 2023-04-03
901 - Add `LESS_BUSY` worker choice strategy.
905 - Optimize worker storage in pool.
906 - Optimize worker alive status check.
907 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
908 - Optimize `LESS_USED` worker choice strategy.
912 - Ensure trimmable characters are checked at pool initialization.
913 - Fix message id integer overflow.
914 - Fix pool worker removal in worker choice strategy internals.
916 ## [2.3.10] - 2023-03-18
920 - Fix package.json `exports` syntax for ESM and CommonJS.
924 - Permit SemVer pre-release publication.
926 ## [2.3.10-2] - 2023-03-18
930 - Fix package.json `exports` syntax for ESM and CommonJS.
932 ## [2.3.10-1] - 2023-03-18
936 - Permit SemVer pre-release publication.
938 ## [2.3.10-0] - 2023-03-18
942 - Fix package.json `exports` syntax for ESM and CommonJS.
944 ## [2.3.9] - 2023-03-18
948 - Introduce ESM module support along with CommonJS one.
952 - Fix brown paper bag bug referencing the same object literal.
954 ## [2.3.8] - 2023-03-18
958 - Switch internal benchmarking code to benny.
959 - Switch to TypeScript 5.x.x.
960 - Switch rollup bundler plugins to core ones.
961 - Switch to TSDoc syntax.
962 - Enforce conventional commits.
966 - Fix random integer generator.
967 - Fix worker choice strategy pool type identification at initialization.
969 ## [2.3.7] - 2022-10-23
973 - Switch to open collective FOSS project funding platform.
974 - Switch to ts-standard linter configuration on TypeScript code.
978 - Fixed missing async on pool execute method.
979 - Fixed typing in TypeScript example.
980 - Fixed types in unit tests.
982 ## [2.3.6] - 2022-10-22
986 - Cleanup pool attributes and methods.
987 - Refine error types thrown.
991 - Fix continuous integration build on windows.
992 - Fix code coverage reporting by using c8 instead of nyc.
994 ## [2.3.5] - 2022-10-21
998 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
999 - Optimize tasks usage lookup implementation.
1003 - Fix missed pool event emitter type export.
1004 - Fix typedoc documentation generation.
1006 ## [2.3.4] - 2022-10-17
1010 - Fully automate release process with release-it.
1014 - Optimize fair share task scheduling algorithm implementation.
1015 - Update benchmark versus external pools results with latest version.
1017 ## [2.3.3] - 2022-10-15
1021 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1023 ## [2.3.2] - 2022-10-14
1027 - Optimize fair share worker selection strategy implementation.
1031 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1033 ## [2.3.1] - 2022-10-13
1037 - Pool worker choice strategies:
1038 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1039 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1041 ## [2.2.2] - 2022-10-09
1045 - Fixed `README.md` file.
1047 ## [2.2.1] - 2022-10-08
1051 - Dynamic worker choice strategy change at runtime.
1053 ## [2.2.0] - 2022-01-05
1055 ### Breaking Changes
1057 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1059 ## [2.1.0] - 2021-08-29
1063 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1065 ### Breaking Changes
1067 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1068 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1069 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1070 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1072 ## [2.0.2] - 2021-05-12
1076 - Fix `busy` event emission on fixed pool type
1078 ## [2.0.1] - 2021-03-16
1082 - Check if pool options are properly set.
1083 - `busy` event is emitted on all pool types.
1085 ## [2.0.0] - 2021-03-01
1089 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1091 ### Breaking Changes
1093 - `FullPool` event is now renamed to `busy`.
1094 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1095 _Find more details on our JSDoc._
1097 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1099 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1101 ### Pool options types declaration merge
1103 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1105 #### New `export` strategy
1109 const DynamicThreadPool = require('poolifier/lib/dynamic')
1111 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1114 But you should always prefer just using
1117 const { DynamicThreadPool } = require('poolifier')
1120 #### New type definitions for input data and response
1122 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1123 _This is not a limitation by poolifier but Node.js._
1125 #### Public property replacements
1127 `numWorkers` property is now `numberOfWorkers`
1129 #### Internal (protected) properties and methods renaming
1131 These properties are not intended for end users
1133 - `id` => `nextMessageId`
1135 These methods are not intended for end users
1137 - `_chooseWorker` => `chooseWorker`
1138 - `_newWorker` => `createWorker`
1139 - `_execute` => `internalExecute`
1140 - `_chooseWorker` => `chooseWorker`
1141 - `_checkAlive` => `checkAlive`
1143 - `_runAsync` => `runAsync`
1145 ## [1.1.0] - 2020-05-21
1149 - ThreadWorker support async functions as option
1150 - Various external library patches
1152 ## [1.0.0] - 2020-01-24
1156 - FixedThreadPool implementation
1157 - DynamicThreadPool implementation
1158 - WorkerThread implementation to improve developer experience