CHANGELOG.md

   1 # Changelog
   2
   3 All notable changes to this project will be documented in this file.
   4
   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).
   7
   8 ## [Unreleased]
   9
  10 ### Changed
  11
  12 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
  13 - Use builtin retry mechanism in worker choice strategies instead of custom one.
  14
  15 ## [3.0.3] - 2023-10-19
  16
  17 ### Fixed
  18
  19 - Avoid null exception at sending message to worker.
  20 - Avoid null exception at checking worker node readiness.
  21
  22 ## [3.0.2] - 2023-10-17
  23
  24 ### Fixed
  25
  26 - 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).
  27
  28 ## [3.0.1] - 2023-10-16
  29
  30 ### Fixed
  31
  32 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
  33
  34 ### Changed
  35
  36 - Switch the worker node eventing code to `EventTarget` API.
  37
  38 ## [3.0.0] - 2023-10-08
  39
  40 ### Changed
  41
  42 - Remove Node.js 16.x.x (EOL) support.
  43
  44 ## [2.7.5] - 2023-10-03
  45
  46 ### Changed
  47
  48 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
  49
  50 ## [2.7.4] - 2023-09-25
  51
  52 ### Fixed
  53
  54 - Fix source maps (bundler issue).
  55
  56 ## [2.7.3] - 2023-09-24
  57
  58 ### Changed
  59
  60 - Convert pool event emitter to event emitter async resource.
  61
  62 ## [2.7.2] - 2023-09-23
  63
  64 ### Changed
  65
  66 - Add source maps to npm package to ease debugging.
  67
  68 ### Added
  69
  70 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
  71
  72 ## [2.7.1] - 2023-09-20
  73
  74 ### Fixed
  75
  76 - Ensure worker message listener used one time are removed after usage.
  77
  78 ## [2.7.0] - 2023-09-19
  79
  80 ### Fixed
  81
  82 - Fix task stealing related tasks queue options handling at runtime.
  83
  84 ### Changed
  85
  86 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
  87
  88 ### Added
  89
  90 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
  91 - Stricter worker constructor arguments validation.
  92
  93 ## [2.6.45] - 2023-09-17
  94
  95 ### Changed
  96
  97 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
  98
  99 ### Added
 100
 101 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
 102 - Add `start()` method to pool API to start the minimum number of workers.
 103 - 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.
 104 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
 105
 106 ## [2.6.44] - 2023-09-08
 107
 108 ### Fixed
 109
 110 - Use a dedicated PAT to publish on GitHub packages registry.
 111
 112 ### Added
 113
 114 - Publish on GitHub packages registry on release.
 115
 116 ### Changed
 117
 118 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 119
 120 ## [2.6.43] - 2023-09-08
 121
 122 ### Added
 123
 124 - Publish on GitHub packages registry on release.
 125
 126 ### Changed
 127
 128 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 129
 130 ## [2.6.42] - 2023-09-06
 131
 132 ### Changed
 133
 134 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
 135
 136 ## [2.6.41] - 2023-09-03
 137
 138 ### Changed
 139
 140 - Optimize worker choice strategies implementation.
 141
 142 ## [2.6.40] - 2023-09-01
 143
 144 ### Fixed
 145
 146 - Do not pre-choose in WRR worker choice strategy to avoid bias.
 147 - Avoid array out of bound in worker choice strategies after worker node removal.
 148
 149 ## [2.6.39] - 2023-08-30
 150
 151 ### Fixed
 152
 153 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
 154
 155 ## [2.6.38] - 2023-08-30
 156
 157 ### Added
 158
 159 - Bundle typescript types declaration into one file.
 160
 161 ### Changed
 162
 163 - Improve interleaved weighted round robin worker choice strategy implementation.
 164
 165 ## [2.6.37] - 2023-08-28
 166
 167 ### Fixed
 168
 169 - Ensure unused worker usage statistics are deleted at runtime.
 170
 171 ### Changed
 172
 173 - Rename worker choice strategy options `choiceRetries` to `retries`.
 174 - Avoid unnecessary branching in worker choice strategies.
 175
 176 ## [2.6.36] - 2023-08-27
 177
 178 ### Fixed
 179
 180 - Fix pool `execute()` arguments check.
 181
 182 ### Changed
 183
 184 - Make continuous tasks stealing algorithm less aggressive.
 185 - Fine tune tasks stealing algorithm under back pressure.
 186
 187 ## [2.6.35] - 2023-08-25
 188
 189 ### Fixed
 190
 191 - Don't account worker usage statistics for tasks that have failed.
 192 - Fix pool information runtime and wait time median computation.
 193
 194 ### Changed
 195
 196 - Update simple moving average implementation to use a circular buffer.
 197 - Update simple moving median implementation to use a circular buffer.
 198 - Account for stolen tasks in worker usage statistics and pool information.
 199
 200 ### Added
 201
 202 - Continuous tasks stealing algorithm.
 203
 204 ## [2.6.34] - 2023-08-24
 205
 206 ### Fixes
 207
 208 - Avoid cascading tasks stealing under back pressure.
 209
 210 ### Changed
 211
 212 - Add fastpath to queued tasks rescheduling.
 213
 214 ## [2.6.33] - 2023-08-24
 215
 216 ### Fixed
 217
 218 - Fix queued tasks rescheduling.
 219
 220 ### Changed
 221
 222 - Rename tasks queue options `queueMaxSize` to `size`.
 223
 224 ### Added
 225
 226 - Task stealing scheduling algorithm if tasks queueing is enabled.
 227
 228 ## [2.6.32] - 2023-08-23
 229
 230 ### Fixed
 231
 232 - Ensure no task can be executed when the pool is destroyed.
 233
 234 ### Added
 235
 236 - Add `queueMaxSize` option to tasks queue options.
 237 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
 238 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
 239
 240 ## [2.6.31] - 2023-08-20
 241
 242 ### Fixed
 243
 244 - Fix worker choice strategy retries mechanism in some edge cases.
 245
 246 ### Changed
 247
 248 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
 249 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
 250
 251 ## [2.6.30] - 2023-08-19
 252
 253 ### Fixed
 254
 255 - Ensure pool event `backPressure` is emitted.
 256 - Ensure pool event `full` is emitted only once.
 257 - Ensure worker node cannot be instantiated without proper arguments.
 258
 259 ## [2.6.29] - 2023-08-18
 260
 261 ### Fixed
 262
 263 - Fix race condition between ready and task functions worker message handling at startup.
 264 - Fix duplicate task function worker usage statistics computation per task function.
 265 - Update task function worker usage statistics if and only if there's at least two different task functions.
 266 - Fix race condition at task function worker usage executing task computation leading to negative value.
 267
 268 ### Added
 269
 270 - 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).
 271 - Use back pressure detection in worker choice strategies.
 272 - Add worker choice strategies retries mechanism if no worker is eligible.
 273
 274 ## [2.6.28] - 2023-08-16
 275
 276 ### Fixed
 277
 278 - Ensure pool workers are properly initialized.
 279
 280 ### Added
 281
 282 - HTTP server pool examples: express-cluster, express-hybrid.
 283
 284 ### Changed
 285
 286 - Remove now useless branching in worker hot code path.
 287
 288 ## [2.6.27] - 2023-08-15
 289
 290 ### Fixed
 291
 292 - Add `KillHandler` type definition to exported types.
 293
 294 ### Added
 295
 296 - Add `destroy` event to pool API.
 297
 298 ## [2.6.26] - 2023-08-15
 299
 300 ### Added
 301
 302 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 303 - Add `listTaskFunctions()` method to pool API.
 304 - SMTP client pool example: nodemailer.
 305
 306 ## [2.6.25] - 2023-08-13
 307
 308 ### Added
 309
 310 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 311 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 312
 313 ## [2.6.24] - 2023-08-12
 314
 315 ### Added
 316
 317 - Add array of transferable objects to the `execute()` method arguments.
 318 - WebSocket server pool examples: ws-worker_threads.
 319
 320 ## [2.6.23] - 2023-08-11
 321
 322 ### Fixed
 323
 324 - 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.
 325
 326 ### Added
 327
 328 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 329 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 330
 331 ## [2.6.22] - 2023-08-10
 332
 333 ### Fixed
 334
 335 - Add missing `types` field to package.json `exports`.
 336
 337 ### Changed
 338
 339 - Structure markdown documentation (PR #811).
 340
 341 ## [2.6.21] - 2023-08-03
 342
 343 ### Changed
 344
 345 - Improve code documentation.
 346 - Code refactoring and cleanup for better maintainability and readability.
 347
 348 ## [2.6.20] - 2023-07-21
 349
 350 ### Fixed
 351
 352 - Fix queued tasks redistribution on error task execution starvation.
 353 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 354
 355 ### Changed
 356
 357 - Drastically reduce lookups by worker in the worker nodes.
 358
 359 ## [2.6.19] - 2023-07-20
 360
 361 ### Added
 362
 363 - Dedicated internal communication channel for worker_threads pools.
 364
 365 ## [2.6.18] - 2023-07-19
 366
 367 ### Changed
 368
 369 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 370
 371 ## [2.6.17] - 2023-07-16
 372
 373 ### Added
 374
 375 - Add `listTaskFunctions()` method to worker API.
 376
 377 ## [2.6.16] - 2023-07-12
 378
 379 ### Fixed
 380
 381 - Fix pool startup detection.
 382 - Fix worker task functions handling.
 383
 384 ## [2.6.15] - 2023-07-11
 385
 386 ### Added
 387
 388 - Take into account worker node readiness in worker choice strategies.
 389
 390 ## [2.6.14] - 2023-07-10
 391
 392 ### Fixed
 393
 394 - Fix task function statistics tracking.
 395
 396 ## [2.6.13] - 2023-07-10
 397
 398 ### Added
 399
 400 - Add per task function statistics tracking.
 401 - Add public methods to manipulate the worker task functions at runtime.
 402
 403 ## [2.6.12] - 2023-07-09
 404
 405 ### Fixed
 406
 407 - Workaround import issue with `node:os` module in node 16.x.x.
 408
 409 ## [2.6.11] - 2023-07-09
 410
 411 ### Fixed
 412
 413 - Fix pool readiness semantic.
 414
 415 ## [2.6.10] - 2023-07-08
 416
 417 ### Fixed
 418
 419 - Ensure workers are not recreated on error at pool startup.
 420
 421 ### Added
 422
 423 - Add `ready` and `strategy` fields to pool information.
 424 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 425 - Add dynamic pool sizing checks.
 426
 427 ## [2.6.9] - 2023-07-07
 428
 429 ### Fixed
 430
 431 - Recreate the right worker type on uncaught exception.
 432
 433 ### Added
 434
 435 - Add minimum and maximum to internal measurement statistics.
 436 - Add `runTime` and `waitTime` to pool information.
 437 - Check worker inactive time only on dynamic worker.
 438
 439 ## [2.6.8] - 2023-07-03
 440
 441 ### Fixed
 442
 443 - Brown paper bag release to fix version handling in pool information.
 444
 445 ## [2.6.7] - 2023-07-03
 446
 447 ### Fixed
 448
 449 - Ensure worker queued tasks at error are reassigned to other pool workers.
 450
 451 ### Added
 452
 453 - Add pool `utilization` ratio to pool information.
 454 - Add `version` to pool information.
 455 - Add worker information to worker nodes.
 456
 457 ## [2.6.6] - 2023-07-01
 458
 459 ### Added
 460
 461 - Add safe helper `availableParallelism()` to help sizing the pool.
 462
 463 ### Fixed
 464
 465 - Ensure message handler is only registered in worker.
 466
 467 ## [2.6.5] - 2023-06-27
 468
 469 ### Known issues
 470
 471 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 472
 473 ### Fixed
 474
 475 - Artificial version bump to 2.6.5 to workaround publication issue.
 476 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 477 - Ensure pool event is emitted before task error promise rejection.
 478 - Fix queued tasks count computation.
 479
 480 ### Removed
 481
 482 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 483
 484 ## [2.6.4] - 2023-06-27
 485
 486 ### Known issues
 487
 488 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 489
 490 ### Fixed
 491
 492 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 493 - Ensure pool event is emitted before task error promise rejection.
 494 - Fix queued tasks count computation.
 495
 496 ### Removed
 497
 498 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 499
 500 ## [2.6.3] - 2023-06-19
 501
 502 ### Fixed
 503
 504 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 505 - Update strategies internals after statistics computation.
 506
 507 ### Changed
 508
 509 - Optimize O(1) queue implementation.
 510
 511 ## [2.6.2] - 2023-06-12
 512
 513 ### Fixed
 514
 515 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 516
 517 ## [2.6.1] - 2023-06-10
 518
 519 ### Added
 520
 521 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 522
 523 ### Fixed
 524
 525 - Fix average statistics computation: ensure failed tasks are not accounted.
 526
 527 ## [2.6.0] - 2023-06-09
 528
 529 ### Added
 530
 531 - Add `LEAST_ELU` worker choice strategy (experimental).
 532 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 533
 534 ### Changed
 535
 536 - Refactor pool worker node usage internals.
 537 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 538 - Breaking change: pool information `info` property object fields have been renamed.
 539
 540 ### Fixed
 541
 542 - Fix wait time accounting.
 543 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 544 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 545
 546 ## [2.5.4] - 2023-06-07
 547
 548 ### Added
 549
 550 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 551
 552 ### Changed
 553
 554 - Compute statistics at the worker level only if needed.
 555 - Add `worker_threads` options to thread pool options.
 556
 557 ### Fixed
 558
 559 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 560
 561 ## [2.5.3] - 2023-06-04
 562
 563 ### Changed
 564
 565 - Refine pool information content.
 566 - Limit pool internals public exposure.
 567
 568 ## [2.5.2] - 2023-06-02
 569
 570 ### Added
 571
 572 - Add `taskError` pool event for task execution error.
 573 - Add pool information `info` property to pool.
 574 - Emit pool information on `busy` and `full` pool events.
 575
 576 ## [2.5.1] - 2023-06-01
 577
 578 ### Added
 579
 580 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 581 - Add `error` pool event for uncaught worker error.
 582
 583 ## [2.5.0] - 2023-05-31
 584
 585 ### Added
 586
 587 - Switch pool event emitter to `EventEmitterAsyncResource`.
 588 - Add tasks wait time accounting in per worker tasks usage.
 589 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 590
 591 ### Changed
 592
 593 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 594
 595 ## [2.4.14] - 2023-05-09
 596
 597 ### Fixed
 598
 599 - Ensure no undefined task runtime can land in the tasks history.
 600 - Fix median computation implementation once again.
 601
 602 ### Added
 603
 604 - Unit tests for median and queue implementations.
 605
 606 ## [2.4.13] - 2023-05-08
 607
 608 ### Fixed
 609
 610 - Fix worker choice strategy options validation.
 611 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 612
 613 ## [2.4.12] - 2023-05-06
 614
 615 ### Added
 616
 617 - Support multiple task functions per worker.
 618 - Add custom worker weights support to worker choice strategies options.
 619
 620 ### Changed
 621
 622 - Use O(1) queue implementation for tasks queueing.
 623
 624 ### Fixed
 625
 626 - Fix median computation implementation.
 627 - Fix fair share worker choice strategy internals update.
 628
 629 ## [2.4.11] - 2023-04-23
 630
 631 ### Changed
 632
 633 - Optimize free worker finding in worker choice strategies.
 634
 635 ## [2.4.10] - 2023-04-15
 636
 637 ### Fixed
 638
 639 - Fix typescript type definition for task function: ensure the input data is optional.
 640 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 641
 642 ## [2.4.9] - 2023-04-15
 643
 644 ### Added
 645
 646 - Add tasks queue enablement runtime setter to pool.
 647 - Add tasks queue options runtime setter to pool.
 648 - Add worker choice strategy options runtime setter to pool.
 649
 650 ### Changed
 651
 652 - Remove the tasks queuing experimental status.
 653
 654 ### Fixed
 655
 656 - Fix task function type definition and validation.
 657 - Fix worker choice strategy options handling.
 658
 659 ## [2.4.8] - 2023-04-12
 660
 661 ### Fixed
 662
 663 - Fix message between main worker and worker type definition for tasks.
 664 - Fix code documentation.
 665
 666 ## [2.4.7] - 2023-04-11
 667
 668 ### Added
 669
 670 - Add worker tasks queue options to pool options.
 671
 672 ### Fixed
 673
 674 - Fix missing documentation.
 675
 676 ## [2.4.6] - 2023-04-10
 677
 678 ### Fixed
 679
 680 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 681 - Properly count worker executing tasks with tasks queueing enabled.
 682
 683 ## [2.4.5] - 2023-04-09
 684
 685 ### Added
 686
 687 - Use monotonic high resolution timer for worker tasks runtime.
 688 - Add worker tasks median runtime to statistics.
 689 - Add worker tasks queue (experimental).
 690
 691 ## [2.4.4] - 2023-04-07
 692
 693 ### Added
 694
 695 - Add `PoolEvents` enumeration and `PoolEvent` type.
 696
 697 ### Fixed
 698
 699 - Destroy worker only on alive check.
 700
 701 ## [2.4.3] - 2023-04-07
 702
 703 ### Fixed
 704
 705 - Fix typedoc generation with inheritance.
 706
 707 ## [2.4.2] - 2023-04-06
 708
 709 ### Added
 710
 711 - Add `full` event to dynamic pool.
 712 - Keep worker choice strategy in memory for conditional reuse.
 713
 714 ### Fixed
 715
 716 - Fix possible negative worker key at worker removal in worker choice strategies.
 717
 718 ## [2.4.1] - 2023-04-05
 719
 720 ### Changed
 721
 722 - Optimize worker choice strategy for dynamic pool.
 723
 724 ### Fixed
 725
 726 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 727
 728 ## [2.4.0] - 2023-04-04
 729
 730 ### Added
 731
 732 - Add `LESS_BUSY` worker choice strategy.
 733
 734 ### Changed
 735
 736 - Optimize worker storage in pool.
 737 - Optimize worker alive status check.
 738 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 739 - Optimize `LESS_USED` worker choice strategy.
 740 - Update benchmark versus external threads pools.
 741 - Optimize tasks usage statistics requirements for worker choice strategy.
 742
 743 ### Fixed
 744
 745 - Ensure trimmable characters are checked at pool initialization.
 746 - Fix message id integer overflow.
 747 - Fix pool worker removal in worker choice strategy internals.
 748 - Fix package publication with pnpm.
 749
 750 ## [2.4.0-3] - 2023-04-04
 751
 752 ### Added
 753
 754 - Add `LESS_BUSY` worker choice strategy.
 755
 756 ### Changed
 757
 758 - Optimize worker storage in pool.
 759 - Optimize worker alive status check.
 760 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 761 - Optimize `LESS_USED` worker choice strategy.
 762 - Update benchmark versus external threads pools.
 763
 764 ### Fixed
 765
 766 - Ensure trimmable characters are checked at pool initialization.
 767 - Fix message id integer overflow.
 768 - Fix pool worker removal in worker choice strategy internals.
 769 - Fix package publication with pnpm.
 770
 771 ## [2.4.0-2] - 2023-04-03
 772
 773 ### Added
 774
 775 - Add `LESS_BUSY` worker choice strategy.
 776
 777 ### Changed
 778
 779 - Optimize worker storage in pool.
 780 - Optimize worker alive status check.
 781 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 782 - Optimize `LESS_USED` worker choice strategy.
 783
 784 ### Fixed
 785
 786 - Ensure trimmable characters are checked at pool initialization.
 787 - Fix message id integer overflow.
 788 - Fix pool worker removal in worker choice strategy internals.
 789 - Fix package publication with pnpm.
 790
 791 ## [2.4.0-1] - 2023-04-03
 792
 793 ### Added
 794
 795 - Add `LESS_BUSY` worker choice strategy.
 796
 797 ### Changed
 798
 799 - Optimize worker storage in pool.
 800 - Optimize worker alive status check.
 801 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 802 - Optimize `LESS_USED` worker choice strategy.
 803
 804 ### Fixed
 805
 806 - Ensure trimmable characters are checked at pool initialization.
 807 - Fix message id integer overflow.
 808 - Fix pool worker removal in worker choice strategy internals.
 809
 810 ## [2.4.0-0] - 2023-04-03
 811
 812 ### Added
 813
 814 - Add `LESS_BUSY` worker choice strategy.
 815
 816 ### Changed
 817
 818 - Optimize worker storage in pool.
 819 - Optimize worker alive status check.
 820 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 821 - Optimize `LESS_USED` worker choice strategy.
 822
 823 ### Fixed
 824
 825 - Ensure trimmable characters are checked at pool initialization.
 826 - Fix message id integer overflow.
 827 - Fix pool worker removal in worker choice strategy internals.
 828
 829 ## [2.3.10] - 2023-03-18
 830
 831 ### Fixed
 832
 833 - Fix package.json `exports` syntax for ESM and CommonJS.
 834
 835 ### Changed
 836
 837 - Permit SemVer pre-release publication.
 838
 839 ## [2.3.10-2] - 2023-03-18
 840
 841 ### Fixed
 842
 843 - Fix package.json `exports` syntax for ESM and CommonJS.
 844
 845 ## [2.3.10-1] - 2023-03-18
 846
 847 ### Changed
 848
 849 - Permit SemVer pre-release publication.
 850
 851 ## [2.3.10-0] - 2023-03-18
 852
 853 ### Fixed
 854
 855 - Fix package.json `exports` syntax for ESM and CommonJS.
 856
 857 ## [2.3.9] - 2023-03-18
 858
 859 ### Changed
 860
 861 - Introduce ESM module support along with CommonJS one.
 862
 863 ### Fixed
 864
 865 - Fix brown paper bag bug referencing the same object literal.
 866
 867 ## [2.3.8] - 2023-03-18
 868
 869 ### Changed
 870
 871 - Switch internal benchmarking code to benny.
 872 - Switch to TypeScript 5.x.x.
 873 - Switch rollup bundler plugins to core ones.
 874 - Switch to TSDoc syntax.
 875 - Enforce conventional commits.
 876
 877 ### Fixed
 878
 879 - Fix random integer generator.
 880 - Fix worker choice strategy pool type identification at initialization.
 881
 882 ## [2.3.7] - 2022-10-23
 883
 884 ### Changed
 885
 886 - Switch to open collective FOSS project funding platform.
 887 - Switch to ts-standard linter configuration on TypeScript code.
 888
 889 ### Fixed
 890
 891 - Fixed missing async on pool execute method.
 892 - Fixed typing in TypeScript example.
 893 - Fixed types in unit tests.
 894
 895 ## [2.3.6] - 2022-10-22
 896
 897 ### Changed
 898
 899 - Cleanup pool attributes and methods.
 900 - Refine error types thrown.
 901
 902 ### Fixed
 903
 904 - Fix continuous integration build on windows.
 905 - Fix code coverage reporting by using c8 instead of nyc.
 906
 907 ## [2.3.5] - 2022-10-21
 908
 909 ### Changed
 910
 911 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 912 - Optimize tasks usage lookup implementation.
 913
 914 ### Fixed
 915
 916 - Fix missed pool event emitter type export.
 917 - Fix typedoc documentation generation.
 918
 919 ## [2.3.4] - 2022-10-17
 920
 921 ### Added
 922
 923 - Fully automate release process with release-it.
 924
 925 ### Changed
 926
 927 - Optimize fair share task scheduling algorithm implementation.
 928 - Update benchmark versus external pools results with latest version.
 929
 930 ## [2.3.3] - 2022-10-15
 931
 932 ### Added
 933
 934 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 935
 936 ## [2.3.2] - 2022-10-14
 937
 938 ### Changed
 939
 940 - Optimize fair share worker selection strategy implementation.
 941
 942 ### Fixed
 943
 944 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 945
 946 ## [2.3.1] - 2022-10-13
 947
 948 ### Added
 949
 950 - Pool worker choice strategies:
 951   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 952   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 953
 954 ## [2.2.2] - 2022-10-09
 955
 956 ### Fixed
 957
 958 - Fixed `README.md` file.
 959
 960 ## [2.2.1] - 2022-10-08
 961
 962 ### Added
 963
 964 - Dynamic worker choice strategy change at runtime.
 965
 966 ## [2.2.0] - 2022-01-05
 967
 968 ### Breaking Changes
 969
 970 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
 971
 972 ## [2.1.0] - 2021-08-29
 973
 974 ### Added
 975
 976 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
 977
 978 ### Breaking Changes
 979
 980 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
 981 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
 982 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
 983 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
 984
 985 ## [2.0.2] - 2021-05-12
 986
 987 ### Bug fixes
 988
 989 - Fix `busy` event emission on fixed pool type
 990
 991 ## [2.0.1] - 2021-03-16
 992
 993 ### Bug fixes
 994
 995 - Check if pool options are properly set.
 996 - `busy` event is emitted on all pool types.
 997
 998 ## [2.0.0] - 2021-03-01
 999
1000 ### Bug fixes
1001
1002 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1003
1004 ### Breaking Changes
1005
1006 - `FullPool` event is now renamed to `busy`.
1007 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1008   _Find more details on our JSDoc._
1009
1010 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1011
1012 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1013
1014 ### Pool options types declaration merge
1015
1016 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1017
1018 #### New `export` strategy
1019
1020 ```js
1021 // Before
1022 const DynamicThreadPool = require('poolifier/lib/dynamic')
1023 // After
1024 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1025 ```
1026
1027 But you should always prefer just using
1028
1029 ```js
1030 const { DynamicThreadPool } = require('poolifier')
1031 ```
1032
1033 #### New type definitions for input data and response
1034
1035 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1036 _This is not a limitation by poolifier but Node.js._
1037
1038 #### Public property replacements
1039
1040 `numWorkers` property is now `numberOfWorkers`
1041
1042 #### Internal (protected) properties and methods renaming
1043
1044 These properties are not intended for end users
1045
1046 - `id` => `nextMessageId`
1047
1048 These methods are not intended for end users
1049
1050 - `_chooseWorker` => `chooseWorker`
1051 - `_newWorker` => `createWorker`
1052 - `_execute` => `internalExecute`
1053 - `_chooseWorker` => `chooseWorker`
1054 - `_checkAlive` => `checkAlive`
1055 - `_run` => `run`
1056 - `_runAsync` => `runAsync`
1057
1058 ## [1.1.0] - 2020-05-21
1059
1060 ### Added
1061
1062 - ThreadWorker support async functions as option
1063 - Various external library patches
1064
1065 ## [1.0.0] - 2020-01-24
1066
1067 ### Added
1068
1069 - FixedThreadPool implementation
1070 - DynamicThreadPool implementation
1071 - WorkerThread implementation to improve developer experience