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