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