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