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 ### Fixed
  11
  12 - Remove all pool events listener at pool destroying.
  13 - Remove all worker node events listener at worker node destroying.
  14 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
  15
  16 ## [3.0.8] - 2023-11-25
  17
  18 ### Fixed
  19
  20 - Ensure continuous tasks stealing on idle start at worker node idling
  21
  22 ## [3.0.7] - 2023-11-24
  23
  24 ### Changed
  25
  26 - Make continuous tasks stealing start at worker node idling.
  27
  28 ## [3.0.6] - 2023-11-24
  29
  30 ### Fixed
  31
  32 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
  33 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
  34
  35 ## [3.0.5] - 2023-10-27
  36
  37 ### Fixed
  38
  39 - Ensure pool `ready` event can be emitted only once.
  40
  41 ## [3.0.4] - 2023-10-20
  42
  43 ### Changed
  44
  45 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
  46 - Use builtin retry mechanism in worker choice strategies instead of custom one.
  47
  48 ## [3.0.3] - 2023-10-19
  49
  50 ### Fixed
  51
  52 - Avoid null exception at sending message to worker.
  53 - Avoid null exception at checking worker node readiness.
  54
  55 ## [3.0.2] - 2023-10-17
  56
  57 ### Fixed
  58
  59 - 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).
  60
  61 ## [3.0.1] - 2023-10-16
  62
  63 ### Fixed
  64
  65 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
  66
  67 ### Changed
  68
  69 - Switch the worker node eventing code to `EventTarget` API.
  70
  71 ## [3.0.0] - 2023-10-08
  72
  73 ### Changed
  74
  75 - Remove Node.js 16.x.x (EOL) support.
  76
  77 ## [2.7.5] - 2023-10-03
  78
  79 ### Changed
  80
  81 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
  82
  83 ## [2.7.4] - 2023-09-25
  84
  85 ### Fixed
  86
  87 - Fix source maps (bundler issue).
  88
  89 ## [2.7.3] - 2023-09-24
  90
  91 ### Changed
  92
  93 - Convert pool event emitter to event emitter async resource.
  94
  95 ## [2.7.2] - 2023-09-23
  96
  97 ### Changed
  98
  99 - Add source maps to npm package to ease debugging.
 100
 101 ### Added
 102
 103 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
 104
 105 ## [2.7.1] - 2023-09-20
 106
 107 ### Fixed
 108
 109 - Ensure worker message listener used one time are removed after usage.
 110
 111 ## [2.7.0] - 2023-09-19
 112
 113 ### Fixed
 114
 115 - Fix task stealing related tasks queue options handling at runtime.
 116
 117 ### Changed
 118
 119 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
 120
 121 ### Added
 122
 123 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
 124 - Stricter worker constructor arguments validation.
 125
 126 ## [2.6.45] - 2023-09-17
 127
 128 ### Changed
 129
 130 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
 131
 132 ### Added
 133
 134 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
 135 - Add `start()` method to pool API to start the minimum number of workers.
 136 - 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.
 137 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
 138
 139 ## [2.6.44] - 2023-09-08
 140
 141 ### Fixed
 142
 143 - Use a dedicated PAT to publish on GitHub packages registry.
 144
 145 ### Added
 146
 147 - Publish on GitHub packages registry on release.
 148
 149 ### Changed
 150
 151 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 152
 153 ## [2.6.43] - 2023-09-08
 154
 155 ### Added
 156
 157 - Publish on GitHub packages registry on release.
 158
 159 ### Changed
 160
 161 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 162
 163 ## [2.6.42] - 2023-09-06
 164
 165 ### Changed
 166
 167 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
 168
 169 ## [2.6.41] - 2023-09-03
 170
 171 ### Changed
 172
 173 - Optimize worker choice strategies implementation.
 174
 175 ## [2.6.40] - 2023-09-01
 176
 177 ### Fixed
 178
 179 - Do not pre-choose in WRR worker choice strategy to avoid bias.
 180 - Avoid array out of bound in worker choice strategies after worker node removal.
 181
 182 ## [2.6.39] - 2023-08-30
 183
 184 ### Fixed
 185
 186 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
 187
 188 ## [2.6.38] - 2023-08-30
 189
 190 ### Added
 191
 192 - Bundle typescript types declaration into one file.
 193
 194 ### Changed
 195
 196 - Improve interleaved weighted round robin worker choice strategy implementation.
 197
 198 ## [2.6.37] - 2023-08-28
 199
 200 ### Fixed
 201
 202 - Ensure unused worker usage statistics are deleted at runtime.
 203
 204 ### Changed
 205
 206 - Rename worker choice strategy options `choiceRetries` to `retries`.
 207 - Avoid unnecessary branching in worker choice strategies.
 208
 209 ## [2.6.36] - 2023-08-27
 210
 211 ### Fixed
 212
 213 - Fix pool `execute()` arguments check.
 214
 215 ### Changed
 216
 217 - Make continuous tasks stealing algorithm less aggressive.
 218 - Fine tune tasks stealing algorithm under back pressure.
 219
 220 ## [2.6.35] - 2023-08-25
 221
 222 ### Fixed
 223
 224 - Don't account worker usage statistics for tasks that have failed.
 225 - Fix pool information runtime and wait time median computation.
 226
 227 ### Changed
 228
 229 - Update simple moving average implementation to use a circular buffer.
 230 - Update simple moving median implementation to use a circular buffer.
 231 - Account for stolen tasks in worker usage statistics and pool information.
 232
 233 ### Added
 234
 235 - Continuous tasks stealing algorithm.
 236
 237 ## [2.6.34] - 2023-08-24
 238
 239 ### Fixes
 240
 241 - Avoid cascading tasks stealing under back pressure.
 242
 243 ### Changed
 244
 245 - Add fastpath to queued tasks rescheduling.
 246
 247 ## [2.6.33] - 2023-08-24
 248
 249 ### Fixed
 250
 251 - Fix queued tasks rescheduling.
 252
 253 ### Changed
 254
 255 - Rename tasks queue options `queueMaxSize` to `size`.
 256
 257 ### Added
 258
 259 - Task stealing scheduling algorithm if tasks queueing is enabled.
 260
 261 ## [2.6.32] - 2023-08-23
 262
 263 ### Fixed
 264
 265 - Ensure no task can be executed when the pool is destroyed.
 266
 267 ### Added
 268
 269 - Add `queueMaxSize` option to tasks queue options.
 270 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
 271 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
 272
 273 ## [2.6.31] - 2023-08-20
 274
 275 ### Fixed
 276
 277 - Fix worker choice strategy retries mechanism in some edge cases.
 278
 279 ### Changed
 280
 281 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
 282 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
 283
 284 ## [2.6.30] - 2023-08-19
 285
 286 ### Fixed
 287
 288 - Ensure pool event `backPressure` is emitted.
 289 - Ensure pool event `full` is emitted only once.
 290 - Ensure worker node cannot be instantiated without proper arguments.
 291
 292 ## [2.6.29] - 2023-08-18
 293
 294 ### Fixed
 295
 296 - Fix race condition between readiness and task functions worker message handling at startup.
 297 - Fix duplicate task function worker usage statistics computation per task function.
 298 - Update task function worker usage statistics if and only if there's at least two different task functions.
 299 - Fix race condition at task function worker usage executing task computation leading to negative value.
 300
 301 ### Added
 302
 303 - 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).
 304 - Use back pressure detection in worker choice strategies.
 305 - Add worker choice strategies retries mechanism if no worker is eligible.
 306
 307 ## [2.6.28] - 2023-08-16
 308
 309 ### Fixed
 310
 311 - Ensure pool workers are properly initialized.
 312
 313 ### Added
 314
 315 - HTTP server pool examples: express-cluster, express-hybrid.
 316
 317 ### Changed
 318
 319 - Remove now useless branching in worker hot code path.
 320
 321 ## [2.6.27] - 2023-08-15
 322
 323 ### Fixed
 324
 325 - Add `KillHandler` type definition to exported types.
 326
 327 ### Added
 328
 329 - Add `destroy` event to pool API.
 330
 331 ## [2.6.26] - 2023-08-15
 332
 333 ### Added
 334
 335 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 336 - Add `listTaskFunctions()` method to pool API.
 337 - SMTP client pool example: nodemailer.
 338
 339 ## [2.6.25] - 2023-08-13
 340
 341 ### Added
 342
 343 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 344 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 345
 346 ## [2.6.24] - 2023-08-12
 347
 348 ### Added
 349
 350 - Add array of transferable objects to the `execute()` method arguments.
 351 - WebSocket server pool examples: ws-worker_threads.
 352
 353 ## [2.6.23] - 2023-08-11
 354
 355 ### Fixed
 356
 357 - 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.
 358
 359 ### Added
 360
 361 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 362 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 363
 364 ## [2.6.22] - 2023-08-10
 365
 366 ### Fixed
 367
 368 - Add missing `types` field to package.json `exports`.
 369
 370 ### Changed
 371
 372 - Structure markdown documentation (PR #811).
 373
 374 ## [2.6.21] - 2023-08-03
 375
 376 ### Changed
 377
 378 - Improve code documentation.
 379 - Code refactoring and cleanup for better maintainability and readability.
 380
 381 ## [2.6.20] - 2023-07-21
 382
 383 ### Fixed
 384
 385 - Fix queued tasks redistribution on error task execution starvation.
 386 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 387
 388 ### Changed
 389
 390 - Drastically reduce lookups by worker in the worker nodes.
 391
 392 ## [2.6.19] - 2023-07-20
 393
 394 ### Added
 395
 396 - Dedicated internal communication channel for worker_threads pools.
 397
 398 ## [2.6.18] - 2023-07-19
 399
 400 ### Changed
 401
 402 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 403
 404 ## [2.6.17] - 2023-07-16
 405
 406 ### Added
 407
 408 - Add `listTaskFunctions()` method to worker API.
 409
 410 ## [2.6.16] - 2023-07-12
 411
 412 ### Fixed
 413
 414 - Fix pool startup detection.
 415 - Fix worker task functions handling.
 416
 417 ## [2.6.15] - 2023-07-11
 418
 419 ### Added
 420
 421 - Take into account worker node readiness in worker choice strategies.
 422
 423 ## [2.6.14] - 2023-07-10
 424
 425 ### Fixed
 426
 427 - Fix task function statistics tracking.
 428
 429 ## [2.6.13] - 2023-07-10
 430
 431 ### Added
 432
 433 - Add per task function statistics tracking.
 434 - Add public methods to manipulate the worker task functions at runtime.
 435
 436 ## [2.6.12] - 2023-07-09
 437
 438 ### Fixed
 439
 440 - Workaround import issue with `node:os` module in node 16.x.x.
 441
 442 ## [2.6.11] - 2023-07-09
 443
 444 ### Fixed
 445
 446 - Fix pool readiness semantic.
 447
 448 ## [2.6.10] - 2023-07-08
 449
 450 ### Fixed
 451
 452 - Ensure workers are not recreated on error at pool startup.
 453
 454 ### Added
 455
 456 - Add `ready` and `strategy` fields to pool information.
 457 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 458 - Add dynamic pool sizing checks.
 459
 460 ## [2.6.9] - 2023-07-07
 461
 462 ### Fixed
 463
 464 - Recreate the right worker type on uncaught exception.
 465
 466 ### Added
 467
 468 - Add minimum and maximum to internal measurement statistics.
 469 - Add `runTime` and `waitTime` to pool information.
 470 - Check worker inactive time only on dynamic worker.
 471
 472 ## [2.6.8] - 2023-07-03
 473
 474 ### Fixed
 475
 476 - Brown paper bag release to fix version handling in pool information.
 477
 478 ## [2.6.7] - 2023-07-03
 479
 480 ### Fixed
 481
 482 - Ensure worker queued tasks at error are reassigned to other pool workers.
 483
 484 ### Added
 485
 486 - Add pool `utilization` ratio to pool information.
 487 - Add `version` to pool information.
 488 - Add worker information to worker nodes.
 489
 490 ## [2.6.6] - 2023-07-01
 491
 492 ### Added
 493
 494 - Add safe helper `availableParallelism()` to help sizing the pool.
 495
 496 ### Fixed
 497
 498 - Ensure message handler is only registered in worker.
 499
 500 ## [2.6.5] - 2023-06-27
 501
 502 ### Known issues
 503
 504 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 505
 506 ### Fixed
 507
 508 - Artificial version bump to 2.6.5 to workaround publication issue.
 509 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 510 - Ensure pool event is emitted before task error promise rejection.
 511 - Fix queued tasks count computation.
 512
 513 ### Removed
 514
 515 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 516
 517 ## [2.6.4] - 2023-06-27
 518
 519 ### Known issues
 520
 521 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 522
 523 ### Fixed
 524
 525 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 526 - Ensure pool event is emitted before task error promise rejection.
 527 - Fix queued tasks count computation.
 528
 529 ### Removed
 530
 531 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 532
 533 ## [2.6.3] - 2023-06-19
 534
 535 ### Fixed
 536
 537 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 538 - Update strategies internals after statistics computation.
 539
 540 ### Changed
 541
 542 - Optimize O(1) queue implementation.
 543
 544 ## [2.6.2] - 2023-06-12
 545
 546 ### Fixed
 547
 548 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 549
 550 ## [2.6.1] - 2023-06-10
 551
 552 ### Added
 553
 554 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 555
 556 ### Fixed
 557
 558 - Fix average statistics computation: ensure failed tasks are not accounted.
 559
 560 ## [2.6.0] - 2023-06-09
 561
 562 ### Added
 563
 564 - Add `LEAST_ELU` worker choice strategy (experimental).
 565 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 566
 567 ### Changed
 568
 569 - Refactor pool worker node usage internals.
 570 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 571 - Breaking change: pool information `info` property object fields have been renamed.
 572
 573 ### Fixed
 574
 575 - Fix wait time accounting.
 576 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 577 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 578
 579 ## [2.5.4] - 2023-06-07
 580
 581 ### Added
 582
 583 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 584
 585 ### Changed
 586
 587 - Compute statistics at the worker level only if needed.
 588 - Add `worker_threads` options to thread pool options.
 589
 590 ### Fixed
 591
 592 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 593
 594 ## [2.5.3] - 2023-06-04
 595
 596 ### Changed
 597
 598 - Refine pool information content.
 599 - Limit pool internals public exposure.
 600
 601 ## [2.5.2] - 2023-06-02
 602
 603 ### Added
 604
 605 - Add `taskError` pool event for task execution error.
 606 - Add pool information `info` property to pool.
 607 - Emit pool information on `busy` and `full` pool events.
 608
 609 ## [2.5.1] - 2023-06-01
 610
 611 ### Added
 612
 613 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 614 - Add `error` pool event for uncaught worker error.
 615
 616 ## [2.5.0] - 2023-05-31
 617
 618 ### Added
 619
 620 - Switch pool event emitter to `EventEmitterAsyncResource`.
 621 - Add tasks wait time accounting in per worker tasks usage.
 622 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 623
 624 ### Changed
 625
 626 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 627
 628 ## [2.4.14] - 2023-05-09
 629
 630 ### Fixed
 631
 632 - Ensure no undefined task runtime can land in the tasks history.
 633 - Fix median computation implementation once again.
 634
 635 ### Added
 636
 637 - Unit tests for median and queue implementations.
 638
 639 ## [2.4.13] - 2023-05-08
 640
 641 ### Fixed
 642
 643 - Fix worker choice strategy options validation.
 644 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 645
 646 ## [2.4.12] - 2023-05-06
 647
 648 ### Added
 649
 650 - Support multiple task functions per worker.
 651 - Add custom worker weights support to worker choice strategies options.
 652
 653 ### Changed
 654
 655 - Use O(1) queue implementation for tasks queueing.
 656
 657 ### Fixed
 658
 659 - Fix median computation implementation.
 660 - Fix fair share worker choice strategy internals update.
 661
 662 ## [2.4.11] - 2023-04-23
 663
 664 ### Changed
 665
 666 - Optimize free worker finding in worker choice strategies.
 667
 668 ## [2.4.10] - 2023-04-15
 669
 670 ### Fixed
 671
 672 - Fix typescript type definition for task function: ensure the input data is optional.
 673 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 674
 675 ## [2.4.9] - 2023-04-15
 676
 677 ### Added
 678
 679 - Add tasks queue enablement runtime setter to pool.
 680 - Add tasks queue options runtime setter to pool.
 681 - Add worker choice strategy options runtime setter to pool.
 682
 683 ### Changed
 684
 685 - Remove the tasks queuing experimental status.
 686
 687 ### Fixed
 688
 689 - Fix task function type definition and validation.
 690 - Fix worker choice strategy options handling.
 691
 692 ## [2.4.8] - 2023-04-12
 693
 694 ### Fixed
 695
 696 - Fix message between main worker and worker type definition for tasks.
 697 - Fix code documentation.
 698
 699 ## [2.4.7] - 2023-04-11
 700
 701 ### Added
 702
 703 - Add worker tasks queue options to pool options.
 704
 705 ### Fixed
 706
 707 - Fix missing documentation.
 708
 709 ## [2.4.6] - 2023-04-10
 710
 711 ### Fixed
 712
 713 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 714 - Properly count worker executing tasks with tasks queueing enabled.
 715
 716 ## [2.4.5] - 2023-04-09
 717
 718 ### Added
 719
 720 - Use monotonic high resolution timer for worker tasks runtime.
 721 - Add worker tasks median runtime to statistics.
 722 - Add worker tasks queue (experimental).
 723
 724 ## [2.4.4] - 2023-04-07
 725
 726 ### Added
 727
 728 - Add `PoolEvents` enumeration and `PoolEvent` type.
 729
 730 ### Fixed
 731
 732 - Destroy worker only on alive check.
 733
 734 ## [2.4.3] - 2023-04-07
 735
 736 ### Fixed
 737
 738 - Fix typedoc generation with inheritance.
 739
 740 ## [2.4.2] - 2023-04-06
 741
 742 ### Added
 743
 744 - Add `full` event to dynamic pool.
 745 - Keep worker choice strategy in memory for conditional reuse.
 746
 747 ### Fixed
 748
 749 - Fix possible negative worker key at worker removal in worker choice strategies.
 750
 751 ## [2.4.1] - 2023-04-05
 752
 753 ### Changed
 754
 755 - Optimize worker choice strategy for dynamic pool.
 756
 757 ### Fixed
 758
 759 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 760
 761 ## [2.4.0] - 2023-04-04
 762
 763 ### Added
 764
 765 - Add `LESS_BUSY` worker choice strategy.
 766
 767 ### Changed
 768
 769 - Optimize worker storage in pool.
 770 - Optimize worker alive status check.
 771 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 772 - Optimize `LESS_USED` worker choice strategy.
 773 - Update benchmark versus external threads pools.
 774 - Optimize tasks usage statistics requirements for worker choice strategy.
 775
 776 ### Fixed
 777
 778 - Ensure trimmable characters are checked at pool initialization.
 779 - Fix message id integer overflow.
 780 - Fix pool worker removal in worker choice strategy internals.
 781 - Fix package publication with pnpm.
 782
 783 ## [2.4.0-3] - 2023-04-04
 784
 785 ### Added
 786
 787 - Add `LESS_BUSY` worker choice strategy.
 788
 789 ### Changed
 790
 791 - Optimize worker storage in pool.
 792 - Optimize worker alive status check.
 793 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 794 - Optimize `LESS_USED` worker choice strategy.
 795 - Update benchmark versus external threads pools.
 796
 797 ### Fixed
 798
 799 - Ensure trimmable characters are checked at pool initialization.
 800 - Fix message id integer overflow.
 801 - Fix pool worker removal in worker choice strategy internals.
 802 - Fix package publication with pnpm.
 803
 804 ## [2.4.0-2] - 2023-04-03
 805
 806 ### Added
 807
 808 - Add `LESS_BUSY` worker choice strategy.
 809
 810 ### Changed
 811
 812 - Optimize worker storage in pool.
 813 - Optimize worker alive status check.
 814 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 815 - Optimize `LESS_USED` worker choice strategy.
 816
 817 ### Fixed
 818
 819 - Ensure trimmable characters are checked at pool initialization.
 820 - Fix message id integer overflow.
 821 - Fix pool worker removal in worker choice strategy internals.
 822 - Fix package publication with pnpm.
 823
 824 ## [2.4.0-1] - 2023-04-03
 825
 826 ### Added
 827
 828 - Add `LESS_BUSY` worker choice strategy.
 829
 830 ### Changed
 831
 832 - Optimize worker storage in pool.
 833 - Optimize worker alive status check.
 834 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 835 - Optimize `LESS_USED` worker choice strategy.
 836
 837 ### Fixed
 838
 839 - Ensure trimmable characters are checked at pool initialization.
 840 - Fix message id integer overflow.
 841 - Fix pool worker removal in worker choice strategy internals.
 842
 843 ## [2.4.0-0] - 2023-04-03
 844
 845 ### Added
 846
 847 - Add `LESS_BUSY` worker choice strategy.
 848
 849 ### Changed
 850
 851 - Optimize worker storage in pool.
 852 - Optimize worker alive status check.
 853 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 854 - Optimize `LESS_USED` worker choice strategy.
 855
 856 ### Fixed
 857
 858 - Ensure trimmable characters are checked at pool initialization.
 859 - Fix message id integer overflow.
 860 - Fix pool worker removal in worker choice strategy internals.
 861
 862 ## [2.3.10] - 2023-03-18
 863
 864 ### Fixed
 865
 866 - Fix package.json `exports` syntax for ESM and CommonJS.
 867
 868 ### Changed
 869
 870 - Permit SemVer pre-release publication.
 871
 872 ## [2.3.10-2] - 2023-03-18
 873
 874 ### Fixed
 875
 876 - Fix package.json `exports` syntax for ESM and CommonJS.
 877
 878 ## [2.3.10-1] - 2023-03-18
 879
 880 ### Changed
 881
 882 - Permit SemVer pre-release publication.
 883
 884 ## [2.3.10-0] - 2023-03-18
 885
 886 ### Fixed
 887
 888 - Fix package.json `exports` syntax for ESM and CommonJS.
 889
 890 ## [2.3.9] - 2023-03-18
 891
 892 ### Changed
 893
 894 - Introduce ESM module support along with CommonJS one.
 895
 896 ### Fixed
 897
 898 - Fix brown paper bag bug referencing the same object literal.
 899
 900 ## [2.3.8] - 2023-03-18
 901
 902 ### Changed
 903
 904 - Switch internal benchmarking code to benny.
 905 - Switch to TypeScript 5.x.x.
 906 - Switch rollup bundler plugins to core ones.
 907 - Switch to TSDoc syntax.
 908 - Enforce conventional commits.
 909
 910 ### Fixed
 911
 912 - Fix random integer generator.
 913 - Fix worker choice strategy pool type identification at initialization.
 914
 915 ## [2.3.7] - 2022-10-23
 916
 917 ### Changed
 918
 919 - Switch to open collective FOSS project funding platform.
 920 - Switch to ts-standard linter configuration on TypeScript code.
 921
 922 ### Fixed
 923
 924 - Fixed missing async on pool execute method.
 925 - Fixed typing in TypeScript example.
 926 - Fixed types in unit tests.
 927
 928 ## [2.3.6] - 2022-10-22
 929
 930 ### Changed
 931
 932 - Cleanup pool attributes and methods.
 933 - Refine error types thrown.
 934
 935 ### Fixed
 936
 937 - Fix continuous integration build on windows.
 938 - Fix code coverage reporting by using c8 instead of nyc.
 939
 940 ## [2.3.5] - 2022-10-21
 941
 942 ### Changed
 943
 944 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 945 - Optimize tasks usage lookup implementation.
 946
 947 ### Fixed
 948
 949 - Fix missed pool event emitter type export.
 950 - Fix typedoc documentation generation.
 951
 952 ## [2.3.4] - 2022-10-17
 953
 954 ### Added
 955
 956 - Fully automate release process with release-it.
 957
 958 ### Changed
 959
 960 - Optimize fair share task scheduling algorithm implementation.
 961 - Update benchmark versus external pools results with latest version.
 962
 963 ## [2.3.3] - 2022-10-15
 964
 965 ### Added
 966
 967 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 968
 969 ## [2.3.2] - 2022-10-14
 970
 971 ### Changed
 972
 973 - Optimize fair share worker selection strategy implementation.
 974
 975 ### Fixed
 976
 977 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 978
 979 ## [2.3.1] - 2022-10-13
 980
 981 ### Added
 982
 983 - Pool worker choice strategies:
 984   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 985   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 986
 987 ## [2.2.2] - 2022-10-09
 988
 989 ### Fixed
 990
 991 - Fixed `README.md` file.
 992
 993 ## [2.2.1] - 2022-10-08
 994
 995 ### Added
 996
 997 - Dynamic worker choice strategy change at runtime.
 998
 999 ## [2.2.0] - 2022-01-05
1000
1001 ### Breaking Changes
1002
1003 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1004
1005 ## [2.1.0] - 2021-08-29
1006
1007 ### Added
1008
1009 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1010
1011 ### Breaking Changes
1012
1013 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1014 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1015 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1016 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1017
1018 ## [2.0.2] - 2021-05-12
1019
1020 ### Bug fixes
1021
1022 - Fix `busy` event emission on fixed pool type
1023
1024 ## [2.0.1] - 2021-03-16
1025
1026 ### Bug fixes
1027
1028 - Check if pool options are properly set.
1029 - `busy` event is emitted on all pool types.
1030
1031 ## [2.0.0] - 2021-03-01
1032
1033 ### Bug fixes
1034
1035 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1036
1037 ### Breaking Changes
1038
1039 - `FullPool` event is now renamed to `busy`.
1040 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1041   _Find more details on our JSDoc._
1042
1043 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1044
1045 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1046
1047 ### Pool options types declaration merge
1048
1049 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1050
1051 #### New `export` strategy
1052
1053 ```js
1054 // Before
1055 const DynamicThreadPool = require('poolifier/lib/dynamic')
1056 // After
1057 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1058 ```
1059
1060 But you should always prefer just using
1061
1062 ```js
1063 const { DynamicThreadPool } = require('poolifier')
1064 ```
1065
1066 #### New type definitions for input data and response
1067
1068 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1069 _This is not a limitation by poolifier but Node.js._
1070
1071 #### Public property replacements
1072
1073 `numWorkers` property is now `numberOfWorkers`
1074
1075 #### Internal (protected) properties and methods renaming
1076
1077 These properties are not intended for end users
1078
1079 - `id` => `nextMessageId`
1080
1081 These methods are not intended for end users
1082
1083 - `_chooseWorker` => `chooseWorker`
1084 - `_newWorker` => `createWorker`
1085 - `_execute` => `internalExecute`
1086 - `_chooseWorker` => `chooseWorker`
1087 - `_checkAlive` => `checkAlive`
1088 - `_run` => `run`
1089 - `_runAsync` => `runAsync`
1090
1091 ## [1.1.0] - 2020-05-21
1092
1093 ### Added
1094
1095 - ThreadWorker support async functions as option
1096 - Various external library patches
1097
1098 ## [1.0.0] - 2020-01-24
1099
1100 ### Added
1101
1102 - FixedThreadPool implementation
1103 - DynamicThreadPool implementation
1104 - WorkerThread implementation to improve developer experience