CHANGELOG.md

8.0.0-alpha.7 (2022-12-15)

Merged in changes from 7.8.0

8.0.0-alpha.6 (2022-12-15)

Merged in changes from 7.7.0

8.0.0-alpha.5 (2022-09-25)

Merged updates from 7.x branch

8.0.0-alpha.4 (2022-07-11)

Bug Fixes

• add missing deprecated JSDoc tag to pluck overload signatures (#6896) (08a549b)

Features

• Subscriber: ctor no longer deprecated. Creates safe subscribers. (ac2b001)
• Subscriber.create: Removed. (826d807)

BREAKING CHANGES

• Subscriber.create: Subscriber.create has been removed. Please use new Subscriber instead.

8.0.0-alpha.1 (2022-02-08)

Merged updates from 7.x branch

8.0.0-alpha.0 (2022-01-13)

Bug Fixes

• takeWhile Boolean constructor types (#6633) (edbaf4f)
• forEach: properly unsubs after error in next handler (#6677) (4c675b8), closes #6676
• WebSocketSubject: handle slow WebSocket close (#6708) (bf3831b), closes #4650 #3935
• RxJS now supports tslib 2.x, rather than just 2.1.x (#6692) (d5d98bc), closes #6689
• schedulers will no longer error while rescheduling and unsubscribing during flushes (7f9c8d3), closes #6672

Features

• empty: removed deprecated empty function. (9bab0d0)
• forEach: Removed PromiseCtor argument (#6736) (b7ba41c)
• never: remove never function (25cdca6)
• Notification: Removed Notification class. (ca4d42a)
• Observable.create: removed (#6602) (fb94ee8)
• subscribe: Removed deprecated fn, fn, fn call pattern. (#6757) (ef59c7e)
• tap: Removed deprecated tap(fn, fn, fn) call pattern. (#6759) (2c0b3e5)
• toPromise removed. (#6598) (8233648)
• useDeprecatedNextContext no longer available (#6596) (df25015)
• Remove "super gross mode" once and for all! useDeprecatedSynchronousErrorHandling is removed (#6595) (5225692)
• Remove SubscribableOrPromise type. (#6735) (d79fd00)
• Subscription: idempotent add and remove of teardowns (#6401) (d197e40), closes #6400
• removed config.Promise injection point. (#6597) (6552b85)

BREAKING CHANGES

• tap: tap(fn, fn, fn) call pattern is no longer available. Use named arguments (observers) instead: tap({ complete: fn, error: fn, next: fn }).

• chore: update dtslint for tap

• chore: update api guardian files

• subscribe: subscribe(fn, fn, fn) is no longer a valid call for subscribe. Instead, use an observer: subscribe({ next: fn, error: fn, complete: fn }).

• chore: remove unnecessary deprecation tests

• forEach: PromiseCtor argument removed. If your runtime lacks a Promise implementation, you'll need to polyfill it.

• Notification: Notification is no longer exported. To create a notification object you may use an object literal. To convert a notification object to an observable, you can use materialize: of({ kind: 'N' as const, value: 'test' }).pipe(materialize()).

• chore: update side-effects snapshots

• never: never() has been removed finally. Just use NEVER.

• empty: empty no longer exists, use EMPTY or if you need scheduling, scheduled.

• SubscribableOrPromise is no longer an exported type, you will likely want to use ObservableInput instead.

• Observable.create: Observable.create has been removed. Use new Observable instead.

• Removed useDeprecatedSynchronousErrorHandling. No workarounds for this.

• chore: update api_guardian files

• chore: remove unnecessary comment

• chore: update api_guardian files

• toPromise has been removed from Observable. As a workaround, use firstValueFrom and lastValueFrom functions, which can be imported from rxjs. For example source$.toPromise() would be lastValueFrom(source$). In the case that you know your source only has one value, we recommend using firstValueFrom(source$).

• Subscription: Adding the same function instance to a subscription as a teardown multiple times will now result in that function being executed only once on teardown. This brings us inline with the behavior of EventTarget, and also makes removing teardowns faster. The workaround is to make sure you are adding a new function instance to the Subscription each time if you need the same effect.

• useDeprecatedNextContext is no longer available. No workaround.

• config.Promise no longer exists. As a workaround, you will need to set a global Promise if one does not already exist in your environment.

• chore: remove unused import

8.0.0-alpha.4 (2022-07-11)

Bug Fixes

• add missing deprecated JSDoc tag to pluck overload signatures (#6896) (08a549b)

Features

• Subscriber: ctor no longer deprecated. Creates safe subscribers. (ac2b001)
• Subscriber.create: Removed. (826d807)

BREAKING CHANGES

• Subscriber.create: Subscriber.create has been removed. Please use new Subscriber instead.

8.0.0-alpha.1 (2022-02-08)

8.0.0-alpha.0 (2022-01-13)

Bug Fixes

• takeWhile Boolean constructor types (#6633) (edbaf4f)
• forEach: properly unsubs after error in next handler (#6677) (4c675b8), closes #6676
• WebSocketSubject: handle slow WebSocket close (#6708) (bf3831b), closes #4650 #3935
• RxJS now supports tslib 2.x, rather than just 2.1.x (#6692) (d5d98bc), closes #6689
• schedulers will no longer error while rescheduling and unsubscribing during flushes (7f9c8d3), closes #6672

Features

• empty: removed deprecated empty function. (9bab0d0)
• forEach: Removed PromiseCtor argument (#6736) (b7ba41c)
• never: remove never function (25cdca6)
• Notification: Removed Notification class. (ca4d42a)
• Observable.create: removed (#6602) (fb94ee8)
• subscribe: Removed deprecated fn, fn, fn call pattern. (#6757) (ef59c7e)
• tap: Removed deprecated tap(fn, fn, fn) call pattern. (#6759) (2c0b3e5)
• toPromise removed. (#6598) (8233648)
• useDeprecatedNextContext no longer available (#6596) (df25015)
• Remove "super gross mode" once and for all! useDeprecatedSynchronousErrorHandling is removed (#6595) (5225692)
• Remove SubscribableOrPromise type. (#6735) (d79fd00)
• Subscription: idempotent add and remove of teardowns (#6401) (d197e40), closes #6400
• removed config.Promise injection point. (#6597) (6552b85)

BREAKING CHANGES

• tap: tap(fn, fn, fn) call pattern is no longer available. Use named arguments (observers) instead: tap({ complete: fn, error: fn, next: fn }).

• chore: update dtslint for tap

• chore: update api guardian files

• subscribe: subscribe(fn, fn, fn) is no longer a valid call for subscribe. Instead, use an observer: subscribe({ next: fn, error: fn, complete: fn }).

• chore: remove unnecessary deprecation tests

• forEach: PromiseCtor argument removed. If your runtime lacks a Promise implementation, you'll need to polyfill it.

• Notification: Notification is no longer exported. To create a notification object you may use an object literal. To convert a notification object to an observable, you can use materialize: of({ kind: 'N' as const, value: 'test' }).pipe(materialize()).

• chore: update side-effects snapshots

• never: never() has been removed finally. Just use NEVER.

• empty: empty no longer exists, use EMPTY or if you need scheduling, scheduled.

• SubscribableOrPromise is no longer an exported type, you will likely want to use ObservableInput instead.

• Observable.create: Observable.create has been removed. Use new Observable instead.

• Removed useDeprecatedSynchronousErrorHandling. No workarounds for this.

• chore: update api_guardian files

• chore: remove unnecessary comment

• chore: update api_guardian files

• toPromise has been removed from Observable. As a workaround, use firstValueFrom and lastValueFrom functions, which can be imported from rxjs. For example source$.toPromise() would be lastValueFrom(source$). In the case that you know your source only has one value, we recommend using firstValueFrom(source$).

• Subscription: Adding the same function instance to a subscription as a teardown multiple times will now result in that function being executed only once on teardown. This brings us inline with the behavior of EventTarget, and also makes removing teardowns faster. The workaround is to make sure you are adding a new function instance to the Subscription each time if you need the same effect.

• useDeprecatedNextContext is no longer available. No workaround.

• config.Promise no longer exists. As a workaround, you will need to set a global Promise if one does not already exist in your environment.

• chore: remove unused import

7.8.0 (2022-12-15)

Features

• buffer: closingNotifier now supports any ObservableInput (#7073) (61b877a)
• delayWhen: delayWhen's delayDurationSelector now supports any ObservableInput (#7049) (dfd95db)
• sequenceEqual: compareTo now supports any ObservableInput (#7102) (d501961)
• share: ShareConfig factory properties now supports any ObservableInput (#7093) (cc3995a)
• skipUntil: notifier now supports any ObservableInput (#7091) (60d6c40)
• window: windowBoundaries now supports any ObservableInput (#7088) (8c4347c)

7.7.0 (2022-12-15)

Features

• distinct: flush argument now supports any ObservableInput (#7081) (74c9ebd)
• repeatWhen: notifier supports ObservableInput (#7103) (8f1b976)
• retryWhen: notifier now supports any ObservableInput (#7105) (794f806)
• sample: notifier now supports any ObservableInput (#7104) (b18c2eb)

7.6.0 (2022-12-03)

Bug Fixes

• schedulers: no longer cause TypeScript build failures when Node types aren't included (c1a07b7)
• types: Improved subscribe and tap type overloads (#6718) (af1a9f4), closes #6717

Features

• onErrorResumeNextWith: renamed onErrorResumeNext and exported from the top level. (onErrorResumeNext operator is stil available, but deprecated) (#6755) (51e3b2c)

7.5.7 (2022-09-25)

Bug Fixes

• schedulers: improve performance of animationFrameScheduler and asapScheduler (#7059) (c93aa60), closes #7017, related to #7018 and #6674

Performance Improvements

• animationFrames: uses fewer Subscription instances (#7060) (2d57b38), closes #7018

7.5.6 (2022-07-11)

Bug Fixes

• share: No longer results in a bad-state observable in an edge case where a synchronous source was shared and refCounted, and the result is subscribed to twice in a row synchronously. (#7005) (5d4c1d9)
• share & connect: share and connect no longer bundle scheduling code by default (#6873) (9948dc2), closes #6872
• exhaustAll: Result will now complete properly when flattening all synchronous observables. (#6911) (3c1c6b8), closes #6910
• TypeScript: Now compatible with TypeScript 4.6 type checks (#6895) (fce9aa1)

7.5.5 (2022-03-08)

Bug Fixes

• package: add types to exports (#6802) (3750f75)
• package: add require export condition (#6821) (c8955e4)
• timeout: no longer will timeout when receiving the first value synchronously (#6865) (2330c96), closes #6862

Performance Improvements

• Don't clone observers unless you have to (#6842) (3289d20)

7.5.4 (2022-02-09)

Performance Improvements

• removed code that would bind functions passed with observers to subscribe. (#6815) (fb375a0), closes #6783

7.5.3 (2022-02-08)

Bug Fixes

• subscribe: allow interop with Monio and other libraries that patch function bind (0ab91eb), closes #6783

7.5.2 (2022-01-11)

Bug Fixes

• operators that ignore input values now use unknown rather than any, which should resolve issues with eslint no-unsafe-argument (#6738) (67cb317), closes #6536
• ajax: crossDomain flag deprecated and properly reported to consumers (#6710) (7fd0575), closes #6663

7.5.1 (2021-12-28)

Bug Fixes

• export supporting interfaces from top-level rxjs site. (#6733) (299a1e1)

7.5.0 (2021-12-27)

Bug Fixes

• takeWhile: Now returns proper types when passed a Boolean constructor. (#6633) (081ca2b)
• forEach: properly unsubs after error in next handler (#6677) (b9ab67d), closes #6676
• WebSocketSubject: handle slow WebSocket close (#6708) (8cb201c), closes #4650 #3935
• RxJS now supports tslib 2.x, rather than just 2.1.x (#6692) (0b2495f), closes #6689
• schedulers will no longer error while rescheduling and unsubscribing during flushes (e35f589), closes #6672

Features

• repeat: now has configurable delay (#6640) (6b7a534)

7.4.0 (2021-10-06)

Features

• Add es2015 entries to the exports declaration to support Angular (#6614) (268777b), closes /github.com/ReactiveX/rxjs/pull/6613#discussion_r716958551

7.3.1 (2021-10-01)

Bug Fixes

• Schedulers: Throwing a falsy error in a scheduled function no longer results in strange error objects. (#6594) (c70fcc0)
• scheduling with Rx-provided schedulers will no longer leak action references (#6562) (ff5a748), closes #6561
• forkJoin: now finalizes sources before emitting (#6546) (c52ff2e), closes #4914
• observeOn: release action references on teardown (321d205)
• types: update schedule signature overload (c61e57c)

7.3.0 (2021-07-28)

Bug Fixes

• Expose Connectable, the return type of connectable (#6531) (69f5bfa), closes #6529
• AsyncSubject: properly emits values during reentrant subscriptions (#6522) (dd8bdf3), closes #6520

Features

• retry: Now supports configurable delay as a named argument (#6421) (5f69795)
• tap: Now supports subscribe, unsubscribe, and finalize handlers (#6527) (eb26cbc)

7.2.0 (2021-07-05)

Bug Fixes

• debounceTime: unschedule dangling task on unsubscribe before complete (#6464) (7ab0a4c)
• fromEvent: Types now properly infer when resultSelector is provided (#6447) (39b9d81)

Features

• Operators are all exported at the top level, from "rxjs". From here on out, we encourage top-level imports with RxJS. Importing from rxjs/operators will be deprecated soon. (#6488) (512adc2), closes #6242

7.1.0 (2021-05-21)

Bug Fixes

• returned operator functions from multicast operators share, publish, publishReplay are now referentially transparent. Meaning if you take the result of calling publishReplay(3) and pass it to more than one observable's pipe method, it will behave the same in each case, rather than having a cumulative effect, which was a regression introduced sometime in version 6. If you required this broken behavior, there is a workaround posted here (#6410) (e2f2e51), closes /github.com/ReactiveX/rxjs/pull/6410#issuecomment-846087374 #5411

Features

• All subjects now have an observed property. This will allow users to check whether a subject has current subscribers without us allowing access to the observers array, which is going to be made private in future versions. (#6405) (f47425d)
• groupBy: Support named arguments, support ObservableInputs for duration selector (#5679) (7a99397)
• share: use another observable to control resets (#6169) (12c3716)

7.0.1 (2021-05-12)

Bug Fixes

• bindCallback: resulting function now recreated underlying Subject and is reusable once again. (#6369) (abf2bc1)
• retry: properly handles retry counts smaller than 1. (#6359) (e797bd7)
• share: properly closes synchronous "firehose" sources. (#6370) (2271a91)
• Observable teardowns now properly called if useDeprecatedSynchronousErrorHandling is true. (#6365) (e19e104), closes #6364
• Subscription: properly release parent subscriptions when unsubscribed. (#6352) (88331d2), closes #6351 #6351
• node: do not reference DOM-related imports to assist in node usage. (#6305) (b24818e), closes #6297

7.0.0 (2021-04-29)

Bug Fixes

• VS code will now properly auto-import operators, et al (#6276) (f43c728), closes #6067
• AjaxResponse: add stricter type (AjaxResponseType) (#6279) (839e192)

7.0.0-rc.3 (2021-04-28)

Bug Fixes

• finalize behaves well with useDeprecatedSynchronousErrorHandling (#6251) (e4bed2a), closes #6250
• resolve run-time errors when using deprecated sync error handling (#6272) (35daaf7), closes #6271
• resolve issue that made users unable to assert instanceof AjaxError. (#6275) (a7c2d29)

Features

• add config object to connectable (#6267) (4d98b40)

BREAKING CHANGES

• Our very new creation function, connectable, now takes a configuration object instead of just the Subject instance. This was necessary to make sure it covered all use cases for what we were trying to replace in the deprecated multicasting operators. Apologies for the late-in-the-game change, but we know it's not widely used yet (it's new in v7), and we want to get it right.

7.0.0-rc.2 (2021-04-20)

Bug Fixes

• webSocket: return the correct type for WebSocketSubject multiplex method(#6232) (33383b8)

Reverts

• Revert "chore: Add typesVersions to package.json (#6229)" (#6241) (304f3a7), closes #6229 #6241

7.0.0-rc.1 (2021-04-19)

Bug Fixes

• TypeScript: Add typesVersions definition to package.json in order to help VS Code find automatic imports. (#6067) (659a623)

7.0.0-rc.0 (2021-04-19)

Bug Fixes

• symbol: revert unique symbol in #5874 (#6224) (3c49429), closes #5919 #6178 #6175
• forkJoin/combineLatest return Observable if passed any (#6227) (ce0a2fa), closes #6226
• fromEvent: match targets properly; fix result selector type (#6208) (8412c73)
• merge: single array is not an array of sources (#6211) (4e900dc)
• pipe: Ensure that unknown is inferred for 9+ arguments. (#6212) (6fa819b)

Features

• add (optional) defaultValue configuration to firstValueFrom and lastValueFrom (#6204) (df51b04)

7.0.0-beta.15 (2021-03-31)

Bug Fixes

• esm: duplicate directory in export path (#6194) (aa41462)

7.0.0-beta.14 (2021-03-30)

Bug Fixes

• share: No longer throws errors for reentrant observables (#6151) (fc728cd), closes #6144

Features

• ajax: Now allows configuration of query string parameters, via a params option in the request configuration (#6174) (980f4d4)
• esm: Added exports within package.json to enable scoped package loading. (#6192) (33a9f06), closes sveltejs/kit#612 nodejs/node#27408
• ReadableStreams: RxJS now supports conversions for ReadableStreams e.g. from(readableStream). (#6163) (19d6502)

7.0.0-beta.13 (2021-03-15)

Bug Fixes

• fromEvent: throw if passed invalid target (#6136) (317ba0c), closes #5823
• remove misused type parameter from static pipe (#6119) (8dc7d17), closes #5557
• Subscriber: don't leak destination (#6116) (5bba36c)
• combineLatest: POJO signature should match only ObservableInput values (#6103) (d633494)
• forkJoin: POJO signature should match only ObservableInput values (#6095) (566427e)
• predicates that return any will now behave property with findIndex (#6097) (c6f73d6)
• remove misused type parameter from isObservable (#6083) (f16b634)
• unhandled errors in observers correctly scheduled (#6118) (c02ceb7)
• defaultIfEmpty: Allow undefined as an argument, require an argument (4983760), closes #6064
• elementAt: Allow defaultValue of undefined. (5bc1b3e)
• first: Allow defaultValue of undefined. (62a6bbe)
• last: Allow defaultValue of undefined. (ef3e721)

Features

• rename and alias combineLatest as combineLatestAll for consistency (#6079) (42cee80), closes #4590

BREAKING CHANGES

• defaultIfEmpty: defaultIfEmpty requires a value be passed. Will no longer convert undefined to null for no good reason.

7.0.0-beta.12 (2021-02-27)

5bc8e3361 Fix/6052 ajax responseType should default to "json" (#6056)

Bug Fixes

• ajax: responseType is now properly defaulted to "json" again. (#6056) (5bc8e3361)
• Corner case resolved where an error thrown in a completion handler might delay teardown if it happened to be after a completing operator like take. (#6062) (a2b9563)
• AsyncGenerator support: consumed async generators are now properly finalized. (#6062) (a2b9563), closes #5998
• throttle: no longer emits more than necessary in sync/sync trailing case (#6059) (9da638a), closes #6058

7.0.0-beta.11 (2021-02-24)

Bug Fixes

• ajax: now errors on forced abort (#6041) (d950921), closes #4251
• buffer: closingNotifier completion does not complete resulting observable (358ae84)
• buffer: Remaining buffer will correctly be emitted on source close. (0c667d5), closes #3990 #6035
• debounceTime: improves performance on quick succession of emits (#6049) (9b70861)
• distinctUntilChanged: Ensure reentrant code is compared properly (#6014) (0ebcf17)
• share: Ensure proper memory clean up (1aa400a)
• window: final window stays open until source complete (e8b05ef)
• concat/merge: operators will finalize inners before moving to the next (#6010) (5249a23), closes #3338
• predicates that return any will now behave property in TS (#5987) (f5ae97d), closes #5986
• publish variants returning ConnectableObservable not properly utilizing lift (#6003) (9acb950)
• Resolve issues with deprecated synchronous error handling and chained operators (#5980) (0ad2802), closes #5979
• useDeprecatedSynchronousErrorThrowing honored for flattened sync sources (#5984) (abd95ce), closes #5983

Features

• ajax: Add option for streaming progress (#6001) (873e52d)
• exhaustAll: renamed exhaust to exhaustAll (#5639) (701c7d4)

BREAKING CHANGES

• window: The windowBoundaries observable no longer completes the result. It was only ever meant to notify of the window boundary. To get the same behavior as the old behavior, you would need to add an endWith and a skipLast(1) like so: source$.pipe(window(notifier$.pipe(endWith(true))), skipLast(1)).
• buffer: Final buffered values will now always be emitted. To get the same behavior as the previous release, you can use endWith and skipLast(1), like so: source$.pipe(buffer(notifier$.pipe(endWith(true))), skipLast(1))
• buffer: closingNotifier completion no longer completes the result of buffer. If that is truly a desired behavior, then you should use takeUntil. Something like: source$.pipe(buffer(notifier$), takeUntil(notifier$.pipe(ignoreElements(), endWith(true)))), where notifier$ is multicast, although there are many ways to compose this behavior.

7.0.0-beta.10 (2021-01-18)

Bug Fixes

• combineLatest: Ensure EMPTY is returned if no observables are passed. (#5963) (157c7e8), closes #5962
• fromEvent: fixed HasEventTargetAddRemove to support EventTarget types (#5945) (5f022d7)

Features

• connect: Adds new connect operator. (9d53af0)
• connectable: Adds connectable creation method (f968a79)
• share: Make share completely configurable. Also adds SubjectLike. (2d600c7)
• TestScheduler: add expectObservable(a$).toEqual(b$). (3372c72)

Performance Improvements

• ensure same hidden class for OperatorSubscriber (#5878) (246b449)

BREAKING CHANGES

• share: The TypeScript type Subscribable now only supports what is a valid return for [Symbol.observable]().
• share: The TypeScript type Observer no longer incorrectly has an optional closed property.

7.0.0-beta.9 (2020-12-07)

Bug Fixes

• audit: don't signal on complete (54cb428)
• bufferToggle: don't signal on complete (65686ff)
• bufferWhen: don't signal on complete (a2ba364)
• debounce: don't signal on complete (c919c68)
• delayWhen: no longer emits if duration selector is empty (#5769) (0872341), closes #3665
• forkJoin: ensure readonly array argument forkJoin([a$, b$, c$] as const) result is correct (6baec53)
• iif: No longer allow accidental undefined arguments (#5829) (23b98b4)
• sample: don't signal on complete (95e0b70)
• Symbol.observable: properly defined as a unique symbol. (#5874) (374138e), closes #5861 #4415
• throttle: don't signal on complete (4af0227)
• windowToggle: don't signal on complete (9cb56c4), closes #5838
• use empty object type in combineLatest/forkJoin sigs (#5832) (22aaaa2)
• withLatestFrom: allow synchronous source (#5828) (adbe65e)

Features

• stopped notification handler (#5750) (cfa267b)
• support emoji in marble diagrams (#5907) (1b4608c)
• filter: improve type inference for filter(Boolean) (#5831) (d2658fa)

BREAKING CHANGES

• windowToggle: the observable returned by the windowToggle operator's closing selector must emit a next notification to close the window. Complete notifications no longer close the window.
• bufferToggle: the observable returned by the bufferToggle operator's closing selector must emit a next notification to close the buffer. Complete notifications no longer close the buffer.
• bufferWhen: the observable returned by the bufferWhen operator's closing selector must emit a next notification to close the buffer. Complete notifications no longer close the buffer.
• debounce: the observable returned by the debounce operator's duration selector must emit a next notification to end the duration. Complete notifications no longer end the duration.
• throttle: the observable returned by the throttle operator's duration selector must emit a next notification to end the duration. Complete notifications no longer end the duration.
• sample: the sample operator's notifier observable must emit a next notification to effect a sample. Complete notifications no longer effect a sample.
• audit: the observable returned by the audit operator's duration selector must emit a next notification to end the duration. Complete notifications no longer end the duration.
• Symbol.observable: rxjs@7 is only compatible with @types/node@14.14.3 or higher and symbol-observable@3.0.0 and higher. Older versions of @types/node incorrectly defined Symbol.observable and will be in conflict with rxjs and symbol-observable@3.0.0.
• delayWhen: delayWhen will no longer emit if the duration selector simply completes without a value. Notifiers must notify with a value, not a completion.
• iif: iif will no longer allow result arguments that are undefined. This was a bad call pattern that was likely an error in most cases. If for some reason you are relying on this behavior, simply substitute EMPTY in place of the undefined argument. This ensures that the behavior was intentional and desired, rather than the result of an accidental undefined argument.

7.0.0-beta.8 (2020-10-15)

Bug Fixes

• audit, auditTime: audit and auditTime emit last value after source completes (#5799) (643bc85), closes #5730
• No longer allow invalid "Subscribable" type as valid observable source in from and others. (258dddd), closes #4532
• bindNodeCallback: ensure underlying function is not called twice during subscription (#5780) (74aa4b2)
• delay: Now properly handles Date and negative numbers (#5719) (868c02b), closes #5232
• delayWhen: only deprecates when subscriptionDelay presents (#5797) (43d1731)
• every: index properly increments in predicate (5686f83)
• firstValueFrom: now unsubscribes from source after first value is received (#5813) (a321516), closes #5811
• from: objects that are thennable that happen to have a subscribe method will no longer error. (789d6e3)
• fromEvent: now properly types JQuery event targets (b5aa15a)
• mergeScan: no longer emits state again upon completion. (#5805) (68c2894), closes #5372
• throttle: now supports synchronous duration selectors (55e953e), closes #5658
• throttle: trailing values will now emit after source completes (d5fd69c)
• timeout: allows synchronous observable as a source (84c5c0b), closes #5746
• zip: zip now accepts an array of arguments like its counterparts (3123b67)

Code Refactoring

• count: Base off of reduce. (98a6d09)
• pairs: Based off of from and Object.entries (#5775) (d39f830)

Features

• ajax: now supports passing custom XSRF cookies in a custom header (#5702) (1a2c2e4), closes #4003
• switchScan: add switchScan() operator (#4442) (73fa910), closes #2931

BREAKING CHANGES

• mergeScan: mergeScan will no longer emit its inner state again upon completion.
• pairs: pairs will no longer function in IE without a polyfill for Object.entries. pairs itself is also deprecated in favor of users just using from(Object.entries(obj)).
• zip: Zipping a single array will now have a different result. This is an extreme corner-case, because it is very unlikely that anyone would want to zip an array with nothing at all. The workaround would be to wrap the array in another array zip([[1,2,3]]). But again, that's pretty weird.
• count: No longer passes source observable as a third argument to the predicate. That feature was rarely used, and of limited value. The workaround is to simply close over the source inside of the function if you need to access it in there.

7.0.0-beta.7 (2020-09-23)

Bug Fixes

• multicast: and other publish variants will handle errors thrown in a selector appropriately (bde8eda)

Code Refactoring

• tap: reduce the size of the implementation (1222d5a)
• Subscriber: Massively untangle Subscriber and SafeSubscriber (07902ca)

BREAKING CHANGES

• Subscriber: new Subscriber no longer takes 0-3 arguments. To create a Subscriber with 0-3 arguments, use Subscriber.create. However, please note that there is little to no reason that you should be creating Subscriber references directly, and Subscriber.create and new Subscriber are both deprecated.

7.0.0-beta.6 (2020-09-23)

Bug Fixes

• AsyncSubject: fixed reentrancy issue in complete (9e00f11), closes /github.com/ReactiveX/rxjs/pull/5729/files/30d429cf1b791db15c04a61f6a683e189b53fb3e#r492314703
• delay: proper handling of absolute time (Date) passed as an argument (8ae89b1)
• fromEvent: properly teardown for ArrayLike targets (066de74)
• ReplaySubject: no longer buffers additional values after it's already stopped (#5696) (a08232b)
• scan: proper indexes when seed is not supplied (f93fb9c), closes #4348 #3879
• windowTime: Passing no creation interval will now properly open new window when old one closes (cbd0ac0)

Code Refactoring

• Massive Size Reduction: reduced the size of all operator implementations as well as other utilities and types (#5729) (4d3fc23)

Features

• onUnhandledError: configuration point added for unhandled errors (#5681) (3485dd5)
• skipLast: counts zero or less will mirror the source (02e113b)

BREAKING CHANGES

• skipLast: skipLast will no longer error when passed a negative number, rather it will simply return the source, as though 0 was passed.
• map: thisArg will now default to undefined. The previous default of MapSubscriber never made any sense. This will only affect code that calls map with a function and references this like so: source.pipe(map(function () { console.log(this); })). There wasn't anything useful about doing this, so the breakage is expected to be very minimal. If anything we're no longer leaking an implementation detail.
• onUnhandledError: Errors that occur during setup of an observable subscription after the subscription has emitted an error or completed will now throw in their own call stack. Before it would call console.warn. This is potentially breaking in edge cases for node applications, which may be configured to terminate for unhandled exceptions. In the unlikely event this affects you, you can configure the behavior to console.warn in the new configuration setting like so: import { config } from 'rxjs'; config.onUnhandledError = (err) => console.warn(err);

7.0.0-beta.5 (2020-09-03)

Bug Fixes

• ajax: Allow XHR to perform body serialization and set content-type where possible (d8657ed), closes #2837
• ajax: Do not mutate headers passed as arguments (0d66ba4), closes #2801
• bindCallback: now emits errors that happen after callback (2bddd31)
• bindNodeCallback: now emits errors that happen after callback (edc28cf)
• buffer: Ensure notifier is subscribed after source (#5654) (c088b0e), closes #2195 #1754
• catchError: ensure proper handling of async return for synchronous source error handling (#5627) (1b29d4b), closes #5115
• catchError: inner synchronous observables will properly terminate (#5655) (d3fd2fb)
• errors: Custom RxJS errors now all have a call stack (#5686) (9bb046c), closes #4250
• onErrorResumeNext: observables always finalized before moving to next source (#5650) (ff68ad2)
• package.json: change homepage setting to official docs site. (#5669) (e57c402)
• repeat: Ensure teardown happens between repeated synchronous obs… (#5620) (0ca8a65)
• repeatWhen: Ensure teardown happens between repeat subscriptions (#5625) (98356f4)
• retry: Ensure teardown happens before resubscription with synchronous observables (6f90597), closes #5620
• retryWhen: Ensure subscription tears down between retries (#5623) (6752af7)
• throttleTime: ensure the spacing between throttles is always at least the throttled amount (#5687) (ea84fc4), closes #3712 #4864 #2727 #4727 #4429
• zip: zip operators and functions are now able to zip all iterable sources (#5688) (02c3a1b), closes #4304
• switchMap and exhaustMap behave correctly with re-entrant code. (c289688)
• webSocket: close websocket connection attempt on unsubscribe (e1a671c), closes #4446

Code Refactoring

• ajax: Use simple Observable (17b9add)
• Subscriber: remove _unsubscribeAndRecycle (d879c3f)
• VirtualTimeScheduler: remove sortActions from public API (#5657) (a468f88)

Features

• combineLatest: add N-args signature for observable inputs (#5488) (fcc47e7)
• Subscription: add no longer returns unnecessary Subscription reference (#5656) (4de604e)
• Subscription: remove will now remove any teardown by reference (#5659) (1531152)
• throwError: now accepts a factory to create the error (#5647) (dad270a), closes #5617
• useDeprecatedNextContext: Puts deprecated next context behavior behind a flag (dfdef5d)
• support schedulers within run (#5619) (c63de0d)

Performance Improvements

• SafeSubscriber: avoid using Object.create (40a9e77)

BREAKING CHANGES

• ajax:
  • ajax body serialization will now use default XHR behavior in all cases. If the body is a Blob, ArrayBuffer, any array buffer view (like a byte sequence, e.g. Uint8Array, etc), FormData, URLSearchParams, string, or ReadableStream, default handling is use. If the body is otherwise typeof "object", then it will be converted to JSON via JSON.stringify, and the Content-Type header will be set to application/json;charset=utf-8. All other types will emit an error.
  • The Content-Type header passed to ajax configuration no longer has any effect on the serialization behavior of the AJAX request.
  • For TypeScript users, AjaxRequest is no longer the type that should be explicitly used to create an ajax. It is now AjaxConfig, although the two types are compatible, only AjaxConfig has progressSubscriber and createXHR.

• zip: zip operators will no longer iterate provided iterables "as needed", instead the iterables will be treated as push-streams just like they would be everywhere else in RxJS. This means that passing an endless iterable will result in the thread locking up, as it will endlessly try to read from that iterable. This puts us in-line with all other Rx implementations. To work around this, it is probably best to use map or some combination of map and zip. For example, zip(source$, iterator) could be source$.pipe(map(value => [value, iterator.next().value])).

• Subscription: add no longer returns an unnecessary Subscription reference. This was done to prevent confusion caused by a legacy behavior. You can now add and remove functions and Subscriptions as teardowns to and from a Subscription using add and remove directly. Before this, remove only accepted subscriptions.

• RxJS Error types Tests that are written with naive expectations against errors may fail now that errors have a proper stack property. In some testing frameworks, a deep equality check on two error instances will check the values in stack, which could be different.

• Undocumented Behaviors/APIs Removed:

  • unsubscribe no longer available via the this context of observer functions. To reenable, set config.useDeprecatedNextContext = true on the rxjs config found at import { config } from 'rxjs';. Note that enabling this will result in a performance penalty for all consumer subscriptions.
  • Leaked implementation detail _unsubscribeAndRecycle of Subscriber has been removed. Just use new Subscription objects
  • Removed an undocumented behavior where passing a negative count argument to retry would result in an observable that repeats forever.
  • An undocumented behavior where passing a negative count argument to repeat would result in an observable that repeats forever.
  • The static sortActions method on VirtualTimeScheduler is no longer publicly exposed by our TS types.

• throwError: In an extreme corner case for usage, throwError is no longer able to emit a function as an error directly. If you need to push a function as an error, you will have to use the factory function to return the function like so: throwError(() => functionToEmit), in other words throwError(() => () => console.log('called later')).

7.0.0-beta.4 (2020-08-02)

Bug Fixes

• ajax: Partial observers passed to progressSubscriber will no longer error (25d279f)
• ajax: Unparsable responses will no longer prevent full AjaxError from being thrown (605ee55)
• animationFrames: emit the timestamp from the rAF's callback (#5438) (c980ae6)
• Ensure unsubscriptions/teardowns on internal subscribers are idempotent (#5465) (3e39749), closes #5464
• timeout: defer error creation until timeout occurs (#5497) (3be9840), closes #5491

Code Refactoring

• ajax: Drop support for IE10 and lower (0eaadd6)
• Observable: Update property and method types (#5572) (144b626)

Features

• combineLatest: support for observable dictionaries (#5022) (#5363) (f5278aa)
• TestScheduler: add an animate "run mode" helper (#5607) (edd6731)
• timeout: One timeout to rule them all (def1d34)

BREAKING CHANGES

• ajax: In an extreme corner-case... If an error occurs, the responseType is "json", we're in IE, and the responseType is not valid JSON, the ajax observable will no longer emit a syntax error, rather it will emit a full AjaxError with more details.
• ajax: Ajax implementation drops support for IE10 and lower. This puts us in-line with other implementations and helps clean up code in this area
• Observable: lift no longer exposed. It was NEVER documented that end users of the library should be creating operators using lift. Lift has a variety of issues and was always an internal implementation detail of rxjs that might have been used by a few power users in the early days when it had the most value. The value of lift, originally, was that subclassed Observables would compose through all operators that implemented lift. The reality is that feature is not widely known, used, or supported, and it was never documented as it was very experimental when it was first added. Until the end of v7, lift will remain on Observable. Standard JavaScript users will notice no difference. However, TypeScript users might see complaints about lift not being a member of observable. To workaround this issue there are two things you can do: 1. Rewrite your operators as outlined in the documentation, such that they return new Observable. or 2. cast your observable as any and access lift that way. Method 1 is recommended if you do not want things to break when we move to version 8.

7.0.0-beta.3 (2020-07-30)

Bug Fixes

• perf: Ensure unsubscriptions/teardowns on internal subscribers are idempotent (#5465) (3e39749), closes #5464
• timeout: defer error creation until timeout occurs (#5497) (3be9840), closes #5491

Code Refactoring

• perf: Reduce memory pressure by no longer retaining outer values across the majority of operators. (#5610) (bff1827)
• Observable: Update property and method types (#5572) (144b626)

Features

• combineLatest: support for observable dictionaries (#5022) (#5363) (f5278aa)

BREAKING CHANGES

• Observable: lift no longer exposed. It was never documented that end users of the library should be creating operators using lift. Lift has a variety of issues and was always an internal implementation detail of rxjs that might have been used by a few power users in the early days when it had the most value. The value of lift, originally, was that subclassed Observables would compose through all operators that implemented lift. The reality is that feature is not widely known, used, or supported, and it was never documented as it was very experimental when it was first added. Until the end of v7, lift will remain on Observable. Standard JavaScript users will notice no difference. However, TypeScript users might see complaints about lift not being a member of observable. To workaround this issue there are two things you can do: 1. Rewrite your operators as outlined in the documentation, such that they return new Observable. or 2. cast your observable as any and access lift that way. It is recommended that operators be implemented in terms of functions that return (source: Observable<T>) => new Observable<R>(...), per the documentation/guide.

7.0.0-beta.2 (2020-07-03)

Bug Fixes

• dependencies: Move accidental dependency on typedoc to dev-dependencies. (#5566) (45702bf)

7.0.0-beta.1 (2020-07-02)

Bug Fixes

• pluck: operator breaks with null/undefined inputs. (#5524) (c5f6550)
• shareReplay: no longer misses synchronous values from source (92452cc)
• interop: chain interop/safe subscriber unsubscriptions correctly (#5472) (98ad0eb), closes #5469 #5311 #2675
• finalize: chain subscriptions for interop with finalize (#5239) (04ba662), closes #5237 #5237
• animationFrameScheduler: don't execute rescheduled animation frame and asap actions in flush (#5399) (33c9c8c), closes #4972 #5397
• iterables: errors thrown from iterables now properly propagated (#5444) (75d4c2f)
• finalize: callback will be called after the source observable is torn down. (0d7b7c1), closes #5357
• Notification: typing improvements (#5478) (96868ac)
• TestScheduler: support empty subscription marbles (#5502) (e65696e), closes #5499
• expand: now works properly with asynchronous schedulers (294b27e)
• subscribeOn: allow Infinity as valid delay (#5500) (cd7d649)
• Subject: resolve issue where Subject constructor errantly allowed an argument (#5476) (e1d35dc)
• Subject: no default generic (e678e81)
• defer: No longer allows () => undefined to observableFactory (#5449) (1ae937a), closes #5449
• single: Corrected behavior for single(() => false) on empty observables. (#5325) (27931bc), closes #5325
• take/takeLast: Properly assert number types at runtime (#5326) (5efc474), closes #5326

Features

• Observable: Remove async iteration (#5492) (8f43e71)
• groupBy: Add typeguards support for groupBy (#5441) (da382da)
• raceWith: add raceWith, the renamed race operator (#5303) (ca7f370)
• fetch: add selector (#5306) (99b5af1), closes #4744
• TimestampProvider: Reduced scheduler footprint for default usage of shareReplay, timeInterval, and timestamp (#4973) (b2e67e3)

BREAKING CHANGES

• Notification.createNext(undefined) will no longer return the exact same reference every time.

• Type signatures tightened up around Notification and dematerialize, may uncover issues with invalid types passed to those operators.

• Experimental support for for await as been removed. Use https://github.com/benlesh/rxjs-for-await instead.

• defer no longer allows factories to return void or undefined. All factories passed to defer must return a proper ObservableInput, such as Observable, Promise, et al. To get the same behavior as you may have relied on previously, return EMPTY or return of() from the factory.

• single operator will now throw for scenarios where values coming in are either not present, or do not match the provided predicate. Error types have thrown have also been updated, please check documentation for changes.

• take and will now throw runtime error for arguments that are negative or NaN, this includes non-TS calls like take().

• takeLast now has runtime assertions that throw TypeErrors for invalid arguments. Calling takeLast without arguments or with an argument that is NaN will throw a TypeError

• ReplaySubject no longer schedules emissions when a scheduler is provided. If you need that behavior, please compose in observeOn using pipe, for example: new ReplaySubject(2, 3000).pipe(observeOn(asap))

• timestamp operator accepts a TimestampProvider, which is any object with a now method that returns a number. This means pulling in less code for the use of the timestamp operator. This may cause issues with TestScheduler run mode. (Issue here: ReactiveX#5553)

7.0.0-beta.0 (2020-04-03)

Bug Fixes

• mergeMapTo: remove redundant/unused generic (#5299) (d67b7da)
• ajax: AjaxTimeoutErrorImpl extends AjaxError (#5226) (a8da8dc)
• delay: emit complete notification as soon as possible (63b8797), closes #4249
• endWith: will properly type N arguments (#5246) (81ee1f7)
• fetch: don't leak event listeners added to passed-in signals (#5305) (d4d6c47)
• TestScheduler: Subclassing TestScheduler needs RunHelpers (#5138) (927d5d9)
• pipe: Special handling for 0-arg case. (#4936) (290fa51)
• pluck: fix pluck's catch-all signature for better type safety (#5192) (e0c5b7c)
• pluck: param type now accepts number and symbol (9697b69)
• startWith: accepts N arguments and returns correct type (#5247) (150ed8b)
• combineLatestWith: and zipWith infer types from n-arguments (#5257) (3e282a5)
• race: support N args in static race and ensure observable returned (#5286) (6d901cb)
• toPromise: correct toPromise return type (#5072) (b1c3573)
• fromFetch: don't reassign closed-over parameter in fromFetch (#5234) (37d2d99), closes #5233 #5233

Features

• add lastValueFrom and firstValueFrom methods (#5295) (e69b765)
• RxJS now supports first-class interop with AsyncIterables (4fa9d01)
• combineLatestWith: adds combineLatestWith - renamed legacy combineLatest operator (#5251) (6d7b146)
• retry: add config to reset error count on successful emission (#5280) (ab6e9fc)
• zipWith: add zipWith which is just a rename of legacy zip operator (#5249) (86b6a27)

BREAKING CHANGES

• startWith: startWith will return incorrect types when called with more than 7 arguments and a scheduler. Passing scheduler to startWith is deprecated
• toPromise: toPromise return type now returns T | undefined in TypeScript, which is correct, but may break builds.

7.0.0-alpha.1 (2019-12-27)

Bug Fixes

• chain subscriptions from observables that belong to other instances of RxJS (e.g. in node_modules) (#5059) (d7f7078)
• clear subscription on shareReplay completion (#5044) (35e600f), closes #5034
• closure: Annotate next() for ReplaySubject (#5088) (8687fbd)
• closure: static prop frameTimeFactor being collapsed when compiled with closure. (39872c9)
• docs: remove repetitive op3() in example (#5043) (e17df33)
• filter: Fix overload order for filter to support inferring the generic type (#5024) (8255365)
• fromFetch: passing already aborted signal to init aborts fetch (0e4849a)

Features

• concatWith: adds concatWith (#4988) (dc89736)

7.0.0-alpha.0 (2019-09-18)

Bug Fixes

• missing package.json in rxjs/fetch (#5001) (f4bee07)
• filter: Resolve TS build failures for certain situations where Boolean is the predicate (77c7dfd)
• pluck: key union type strictness (#4585) (bd5ec2d)
• race: ignore latter sources after first complete or error (#4809) (f31c3df), closes #4808
• scan/reduce: Typings correct for mixed seed/value types (#4858) (b89ebe5)
• scheduled: import from relative paths (#4832) (1d37a87)
• TS: Error impls now properly type this (#4978) (7606dc7)
• TS: fix type inference for defaultIfEmpty. (#4833) (9b5ce2f)
• types: add Boolean signature to filter (#4961) (259853e), closes #4959 /github.com/ReactiveX/rxjs/issues/4959#issuecomment-520629091

Features

• animationFrames: Adds an observable of animationFrames (#5021) (6a4cd68)
• concat: can infer N types (6c0cbc4)
• of: Update of typings (e8adbb5)
• rxjs-compat: removed for v7 (#4839) (79b1b95)
• TestScheduler: expose frameTimeFactor property (#4977) (8c32ed0)
• TS: Update to TypeScript 3.5.3 (741a136)

BREAKING CHANGES

• concat: Generic signature changed. Recommend not explicitly passing generics, just let inference do its job. If you must, cast with as.
• of: Generic signature changed, do not specify generics, allow them to be inferred or use as
• of: Use with more than 9 arguments, where the last argument is a SchedulerLike may result in the wrong type which includes the SchedulerLike, even though the run time implementation does not support that. Developers should be using scheduled instead
• TS: RxJS requires TS 3.5
• rxjs-compat: rxjs/Rx is no longer a valid import site.
• rxjs-compat: rxjs-compat is not published for v7 (yet)
• race: race() will no longer subscribe to subsequent observables if a provided source synchronously errors or completes. This means side effects that might have occurred during subscription in those rare cases will no longer occur.

6.5.3 (2019-09-03)

Bug Fixes

• general: Refactor modules so they don't show side effects in some tools (#4769) (9829c5e0)
• defer: restrict allowed factory types (#4835) (40a22096)

6.5.2 (2019-05-10)

Bug Fixes

• endWith: wrap args - they are not observables - in of before concatenating (#4735) (986be2f)
• forkJoin: test for object literal (#4741) (c11e1b3), closes #4737 #4737
• Notification: replace const enum (#4556) (e460eec), closes #4538
• of: remove deprecation comment to prevent false positive warning (#4724) (da69c16)
• pairwise: make it recursion-proof (#4743) (21ab261)
• scan: fixed declarations to properly support different return types (#4598) (126d2b6)
• Subscription: Return Empty when teardown === null (#4575) (ffc4e68)
• throttleTime: emit single value with trailing enabled (#4564) (fd690a6), closes #2859 #4491
• umd: export fetch namespace (#4738) (7926122)
• fromFetch: don't abort if fetch resolves (#4742 (ed8d771)

6.5.1 (2019-04-23)

Bug Fixes

• Notification: replace const enum (#4556) (e460eec), closes #4538
• throttleTime: emit single value with trailing enabled (#4564) (fd690a6), closes #2859 #4491

6.5.0 (2019-04-23)

Bug Fixes

• docs-app: remove stopWordFilter from lunr pipeline (#4536) (9eaebd4)
• dtslint: disable tests that break in TS@next (#4705) (ecc73d2)
• index: export NotificationKind (#4514) (7125355), closes #4513
• race: better typings (#4643) (fb9bc48), closes #4390 #4642
• throwIfEmpty: ensure result is retry-able (c4f44b9)
• types: Fixed signature for onErrorResumeNext (#4603) (4dd0be0)

Features

• combineLatest: deprecated rest argument and scheduler signatures (#4641) (6661c79), closes #4640
• fromFetch: We now export a fromFetch static observable creation method from rxjs/fetch. Mirrors native fetch only it's lazy and cancellable via Observable interface. (#4702) (5a1ef86)
• forkJoin: accepts a dictionary of sources (#4640) (b5a2ac9)
• partition: new partition observable creation function. Old partition operator is deprecated (#4419) (#4685) (d5d6980)
• scheduled: Add scheduled creation function to use to create scheduled observable of values. Deprecate scheduled versions of from, range, et al. (#4595) (f57e1fc)

Performance Improvements

• Subscription: improve parent management (#4526) (06f1a25)

6.4.0 (2019-01-30)

Bug Fixes

• ajax: Fix case-insensitive headers in HTTP request (#4453) (673bf47)
• bundle: closure to not rewrite polyfills for minification (#4487) (a1fedb9)
• bundle: don't export operators twice (#4310) (2399f6e)
• combineLatest: improve typings for combineLatest (#4470) (40c3d9f)
• compat: remove internal from import locations (#4498) (a6c0017), closes #4070
• endWith: ability to endWith different types (#4183) (#4185) (83533d1)
• fromEventPattern: improve typings for fromEventPattern (#4496) (037f53d)
• Observable: Fix Observable.subscribe to add operator TeardownLogic to returned Subscription. (#4434) (f28955f)
• subscribe: Deprecate null starting parameter signatures for subscribe (#4202) (c85ddf6)
• combineLatest: support passing union types (ffda319)
• from: support passing union types (eb1d596)
• withLatestFrom: support passing union types (1e19a24)
• zip: support passing union types (0d87f52)
• multicast: support returning union types from projection (e9e9041)
• exhaustMap: support returning union types from projection (ff1f5dc)
• merge: support union type inference for merge operators (c2ac39c)
• catchError: support union type returns (8350622)
• switchMap: support union type returns (32d35fd)
• defer: support union types passed (5aea50e)
• race: Update typings to support proper return types (#4465) (0042846)
• VirtualTimeScheduler: rework flush so it won't lose actions (#4433) (d068bc9)
• WebSocketSubject: fix subject failing to close socket (#4446) (dcfa52b)

Features

• shareReplay: Add configuration object for named arguments, and add argument to support unsubscribing from source observable by refCount when all resulting subscriptions have unsubscribed. The default behavior is to leave the source subscription running.
• mergeScan: Add index to the accumulator function (#4458) (f5e143d), closes #4441
• range: accept one argument (#4360) (a388578)
• takeWhile: add an inclusive option to the operator which causes to emit final value (#4115) (6e7f407)

Performance Improvements

• internal: optimize Subscription#add() for the common case (#4489) (bdd201c)
• internal: use strict equality for isObject() (#4493) (fc84a00)
• Subscription: use instanceof to avoid megamorphic LoadIC (#4499) (065b4e3)

6.3.3 (2018-09-25)

Bug Fixes

• pipe: align static pipe to Observable pipe rest parameters overl… (#4112) (8c607e9), closes #4109 #4109
• RxJS: each instance of RxJS now has a unique Subscriber symbol (0972c56)
• subscribe: report errors that occur in subscribe after the initial error (#4089) (9b4b2bc), closes #3803
• Subscriber: Can no longer subscribe to itself in a circular manner (#4106) (e623ec6), closes #4095
• Subscriber: use only local Subscriber instances (50ee0a7)
• TypeScript: ensure RxJS builds with TS@next as well (f03e790)

6.3.2 (2018-09-04)

Bug Fixes

• node: will no longer error mixing RxJS 6.3 and 6.2 (#4078) (69d9ccf), closes #4077

6.3.1 (2018-08-31)

Bug Fixes

• mergeMap: fix nested mergeMaps (#4072) (0ab701b), closes #4071

6.3.0 (2018-08-30)

Bug Fixes

• find: unsubscribe from source when found (#3968) (fd01f7b)
• convert @internal comment to JSDoc (#3932) (f8a9d6e)
• AjaxObservable: notify with error if fails to parse json response (#3139) (d8231e2), closes #3138
• catchError: stop listening to a synchronous inner-observable when unsubscribed (456ef33)
• distinctUntilKeyChanged: improved key typing with keyof T (#3988) (4ec4ff1)
• exhaustMap: stop listening to a synchronous inner-observable when unsubscribed (ee1a339)
• find: add undefined to return type (#3970) (5a6c90f), closes #3969
• IE10: Remove dependency on Object.setPrototypeOf (#3967) (5c52a73), closes #3966
• mergeAll: add source subscription to composite before actually subscribing (#2479) (40852ff), closes #2476
• mergeScan: stop listening to a synchronous inner-observable when unsubscribed (c4002f3)
• Observable: forEach will no longer next values after an error (b4bad1f)
• Observable: use more granular Observable exports in compat mode (#3974) (3f75564)
• onErrorResumeNext: stop listening to a synchronous inner-observable when unsubscribed (1d14277)
• pipe: replace rest parameters overload (#3945) (872b0ec), closes #3841
• skipUntil: stop listening to a synchronous notifier after its first nexted value (1c257db)
• startWith: allow empty type signature and passing a different type (b7866a0)
• subscribable: make subscribe() signature match Observable (#4050) (865d8d7), closes #3891
• subscriber: unsubscribe parents on error/complete (ad8131b)
• switchMap: stop listening to a synchronous inner-observable when unsubscribed (260d52a)
• takeUntil: takeUntil should subscribe to the source if notifier sync completes without emitting (#4039) (21fd0b4), closes #3504
• testscheduler: type arguments to Observable creation functions (#3928) (0e30ef1)

Features

• delayWhen: add index to the selector function (#2473) (0979d31)
• forEach: deprecating passing promise constructor (5178ab9)
• TestScheduler: Add subscription schedule to expectObservable (#3997) (0d20255)

6.2.2 (2018-07-13)

Bug Fixes

• first: improved type guards for TypeScript (3e12f7a)
• last: improved type guards for TypeScript (3e12f7a)

6.2.1 (2018-06-12)

Bug Fixes

• ci: do not trigger postbuild script on PR (f82c085)
• delayWhen: Emit source value if duration selector completes synchronously (#3664) (2c43af7), closes #3663
• docs: fix broken github links (#3802) (9f9bf9b)
• docs: fix code examples (#3784) (a95441b)
• from: Objects implementing Symbol.observable take precedence over other types (80ceea0)
• fromEvent: Support React Native and node-compatible event sources. (#3821) (1969f18)
• Observable.prototype.pipe: TS typings now more correct for >8 parameters (#3789) (ad010ea)
• subscribe: ignore syncError when deprecated (#3749) (f94560c)
• Symbol.observable: make observable declaration readonly (#3697) (#3773) (e1c203f)
• TypeScript: resolved typings issue for TS 3.0 (bf2cdeb)
• typings: allow bufferCreationInterval null for bufferTime (#3734) (0bda9cd), closes #3728

Performance Improvements

• remove comments from js-files (#3760) (bb2c334)

6.2.0 (2018-05-22)

Bug Fixes

• ajax: Handle timeouts as errors (#3653) (e4128ea)
• ajax: RxJS v6 TimeoutError is missing name property (576d943)
• isObservable: Fix throwing error when testing isObservable(null) (#3688) (c9acc61)
• range: Range should be same for every subscriber (#3707) (9642133)
• skipUntil: fix skipUntil when innerSubscription is null (#3686) (4226432)
• TestScheduler: restore run changes upon error (27cb9b6)
• TimeoutError: Add name to TimeoutError (44042d0)
• WebSocketSubject: Check to see if WebSocket exists in global scope (#3694) (2db0788)

Features

• endWith: add new operator endWith (#3679) (537fe7d)

6.1.0 (2018-05-03)

Bug Fixes

• audit: will not crash if duration is synchronous (#3608) (76b7e27), closes #2743
• delay: fix memory leak (#3605) (96f05b0)

Features

• isObservable: a new method for checking to see if an object is an RxJS Observable (edb33e5)

6.0.0 (2018-04-24)

Bug Fixes

• websocket: no longer throws errors in operators applied to it (#3577) (cb38ddf)

Code Refactoring

• webSocket: rename back to webSocket ala 5.0 (#3590) (d5658fe)

Features

• testing: Add testScheduler.run() helper (2d5b3b2)
• testing: testScheduler.run() supports time progression syntax (9322b7d)

BREAKING CHANGES

• webSocket: UNBREAKING websocket to be named webSocket again, just like it was in 5.0. Now you should import from rxjs/webSocket

6.0.0-uncanny-rc.7 (2018-04-13)

Bug Fixes

• interop: functions with [Symbol.observable] on them will now be accepted in operators like mergeMap, from, etc (#3562) (c9570df)
• migrations: change the version the migration applies to (#3564) (9217a03)
• rxjs: no longer requires dom lib (#3566) (8b33ee2)
• throttleTime: emit throttled values when complete if trailing=true (#3559) (3e846f2), closes #3351
• websocket: export WebSocketSubject, WebSocketSubjectConfig from rxjs/websocket (#3557) (c365405)

6.0.0-ucandoit-rc.6 (2018-04-13)

Bug Fixes

• migrations: make sure collection.json is present (63e10a8)

6.0.0-uber-rc.5 (2018-04-13)

Bug Fixes

• migrations: deploy compiled JS rather than just the TS files. (9aed72f)

6.0.0-turbo-rc.4 (2018-04-12)

Bug Fixes

• groupBy: reexporting the GroupedObservable type (#3556) (12d4933), closes #3551
• migrations: build now properly copies migration into package (#3555) (329a145)

6.0.0-terrific-rc.3 (2018-04-11)

Features

• schematics: add migration schematics for schematics users (20a2f07)

6.0.0-tenacious-rc.2 (2018-04-11)

Bug Fixes

• compat: fix first & last operators so undefined arguments won't create empty values (#3542) (a327db2)
• node/TS: eliminate incompatible types to protected properties (#3544) (21dd3bd)

BREAKING CHANGES

• NodeJS Dropping support for non-LTS versions of Node.

6.0.0-tactical-rc.1 (2018-04-07)

Why "tactical"? Because I TOTALLY MEANT to ruin the release names by publishing an amazingly funny April Fool's joke about smooshMap. So this was "tactical". Super tactical. So very tactical.

Bug Fixes

• closure-compiler: adds nocollapse to static members (#3519) (8758a5d)
• closure-compiler: remove internal flag from _isScalar (#3520) (b3a657d)
• closure-compiler: remove top level throws (#3518) (b069473)
• closure-compiler: removes bad [@params](https://github.com/params) comments that caused issues (#3521) (09c874c)
• compat: deprecate Observable.if/throw (#3527) (3116275)
• compat: export TeardownLogic (#3532) (0c76e64), closes #3531
• compat: remove observable/scalar deep import as it wasn't previously available (4566001)
• Scheduler: export but deprecate (#3522) (a3e1fb8)
• skipUntil: properly manages notifier subscription (889f84a), closes #1886
• fix type mismatch in NodeStyleEventEmitter (#3530) (3f51ddd)
• sourcemaps: fix mappings for source maps so they will work (#3523) (32e7f75), closes #3479

Features

• compat: add Observable extension classes with static create() (ecd7f68)
• compat: add rxjs/interfaces exports (ba5c266)

6.0.0-rc.0 (2018-03-31)

Bug Fixes

• ajax: properly encode body with form data that includes URLs (#3502) (4455d21), closes #2399
• bindNodeCallback: better type inference (932bb7a)
• elementAt: now allows falsy defaultValues (13706e7)
• lint_perf: fix lint issues with newer perf tests (1013754)
• throttle: now properly trailing throttles for individual values (#3505) (3db18d1), closes #2864

Features

• takeUntil: no longer subscribes to source if notifier synchronously emits (#3504) (7b8a3e3), closes #2189

Performance Improvements

• pluck,bufferTime,asObservable: add performance tests for pluck(), bufferTime() and asObservable() operators (#2491) (24506b3)
• ReplaySubject: slightly improved performance (#2677) (9fea36d)

BREAKING CHANGES

• throttle: This changes the behavior of throttle, in particular throttling with both leading and trailing behaviors set to true, to more closely match the throttling behavior of lodash and other libraries. Throttling now starts immediately after any emission from the observable, and values will not be double emitted for both leading and trailing values

6.0.0-beta.4 (2018-03-29)

Bug Fixes

• bindCallback: add better type overloads (#3480) (037cf34)
• compat: add IScheduler to compat/Scheduler (0a67df6)

Features

• compat: add all utilities to internal-compatibility (a9ecfe7)
• websocket: Add serializer/deserializer config settings (#3489) (8d44124)

BREAKING CHANGES

• websocket: WebSocketSubject will now JSON serialize all messages sent over it by default, to return to the old behavior, pass a config setting of serializer: x => x like so: websocket({ url, serializer: x => x })

6.0.0-beta.3 (2018-03-27)

Bug Fixes

• build: update build-optimizer and point to correct sources (6717a01)
• node: Subscriber no longer trampled if from another copy of rxjs (371b658)
• Observable: empty ctor returns valid Observable (#3464) (58b8ebc)
• subscribeOn: add subscribeOn back to the distribution (d6556f2)

6.0.0-beta.2 (2018-03-24)

Bug Fixes

• build: update build-optimizer and point to correct sources (6717a01)
• Observable: empty ctor returns valid Observable (#3464) (58b8ebc)
• subscribeOn: add subscribeOn back to the distribution (d6556f2)

6.0.0-beta.1 (2018-03-21)

Bug Fixes

• remove duplicate Subscribable interface declaration (#3450) (ac78d89)
• compat: add package.json for internal-compatibility package (#3455) (3b306ed)
• config.useDeprecatedSynchronousErrorThrowing: reentrant error throwing no longer trapped (#3449) (0892a2d), closes #3161

Features

• compat: add interfaces export (d8f8122)
• compat: add rxjs/observable/dom/* APIs to compatibility package (d9a618f)

6.0.0-beta.0 (2018-03-16)

Bug Fixes

• AjaxObservable: 1xx,2xx,3xx requests shouldn't error, only 4xx,5xx (#3438) (2128932)
• compat: adjustments to get rxjs-compat to build correctly (dea6964)
• config: expose configuration via rxjs exports (#3441) (4287424)
• config: make sure that Promise config is undefined initially (#3440) (469afe8)
• ESM: Add [operators|ajax|websocket|testing]/package.json for ESM support, fixes #3227 (#3356) (725dcb4)
• forkJoin: fix forkJoin typings for forkJoin(Observable[]) (#3436) (17c7f8f)
• fromEvent: Defines toString to fix Closure compilations (#3417) (1558b43)
• fromEvent: pass options in unsubscribe (f1872b0), closes #3349
• publishReplay: type inference improved (#3437) (dd7c9f1), closes #3260
• rxjs: add exports for symbols/interfaces that were missing (#3380) (1622ee0)
• rxjs: make sure esm imports from index.js by default, not Rx.js (#3316) (c2b00f4), closes #3315
• rxjs: once again exports custom error types (#3371) (4465a9f)
• rxjs: remove types.ts importing from itself. (#3383) (8fd50ad)
• spec: get tests running using compatibility package (916e968)
• correct internal module paths to be systemjs compatible (#3412) (35abc9d)
• Symbol.iterator: correctly handle case where Symbol constructor itself is not defined (#3394) (6725be1)
• typings: fixed some cases where multicast and publish would not return a ConnectableObservable (#3320) (ddffecc)
• reexport Symbol.observable typings patch (4c4d7b0)
• remove the root operators.ts because it overshadows operators/package.json (184b6d4)

Code Refactoring

• Observable.if: remove ts hacks from Observable (f46f261)
• Rx.ts: move Rx.ts to internal (#3400) (7ad2119)

Features

• ajax: default to opting into CORS (#3442) (aa3bf57), closes #3273
• bindCallback: remove result selector (2535641)
• bindNodeCallback: remove resultSelector (26e6e5c)
• compat: add compatability package definition (40aca82)
• compat: add concat operator to compatibility layer (6e84e78)
• compat: add legacy reexport compat layer for 'rxjs/Observable' and other top-level symbols (70e562b)
• compat: add Rx.ts to rxjs-compat (df25de1)
• compat: compatibility mode for combineLatest (fd86df5)
• compat: compatibility mode for merge operator (ffce980)
• compat: compatibility mode for zip operator (9f131d0)
• compat: make Rx.ts for compatability layer work as the default for rxjs-compat (d43a4c2)
• compat: set up correct imports & get build working for rxjs-comapt (1a0dc97)
• deprecated-error-handling-warning: add console warning when code sets the flag to bad mode (49be56a)
• error-handling: add deprecated sync error handling behind a flag (583cd1d)
• exhaustMap: simplify interface (42589d0)
• first: simplify interface (a011338)
• forkJoin: simplify interface (4d2338b)
• fromEvent: remove resultSelector (197f449)
• fromEvent: will now emit an array when event emits multiple arguments (51b37fd)
• fromEventPattern: removed resultSelector (6b34f9f)
• last: simplify interface (3240419)
• mergeMap|concatMap|concatMapTo: simplified the signatures (d293245)
• mergeMapTo: simplify interface (582c7be)
• never: no longer export never function (#3386) (53debc8)
• switchMap|switchMapTo: simplify interface (959fb6a)
• Symbol.iterator: no longer polyfilled (#3389) (6319f3c)
• Symbol.observable: is no longer polyfilled (#3387) (4a5aaaf)
• throwIfEmpty: adds throwIfEmpty operator (#3368) (9b21458)
• typings: updated typings for combineAll, mergeAll, concatAll, switch, exhaust, zipAll (#3321) (f7e4c02)
• umd: UMD now mirrors export schema for ESM and CJS (#3426) (556c904)

BREAKING CHANGES

• ajax: will no longer execute a CORS request by default, you must opt-in with the crossDomain flag in the config.
• mergeMap|concatMap|concatMapTo: mergeMap, concatMap and concatMapTo no longer support a result selector, if you need to use a result selector, use the following pattern: source.mergeMap(x => of(x + x).pipe(map(y => y + x)) (the pattern would be the same for concatMap).
• never: no longer exported. Use the NEVER constant instead.
• bindCallback: removes result selector, use map instead: bindCallback(fn1, fn2)() becomes bindCallback(fn1)().pipe(map(fn2))
• Rx.ts: importing from rxjs/Rx is no longer available. Upcoming backwards compat solution will allow that
• Symbol.iterator: We are no longer polyfilling Symbol.iterator. That would be done by a proper polyfilling library
• Observable.if: TypeScript users using Observable.if will have to cast Observable as any to get to if. It is a better idea to just use iif directly via import { iif } from 'rxjs';
• bindNodeCallback: resultSelector removed, use map instead: bindNodeCallback(fn1, fn2)() becomes bindNodeCallback(fn1)().pipe(map(fn2))
• Symbol.observable: RxJS will no longer be polyfilling Symbol.observable. That should be done by an actual polyfill library. This is to prevent duplication of code, and also to prevent having modules with side-effects in rxjs.
• fromEvent: result selector removed, use map instead: fromEvent(target, 'click', fn) becomes fromEvent(target, 'click').pipe(map(fn))
• last: no longer accepts resultSelector argument. To get this same functionality, use map.
• first: no longer supports resultSelector argument. The same functionality can be achieved by simply mapping either before or after first depending on your use case.
• exhaustMap: resultSelector no longer supported, to get this functionality use: source.pipe(exhaustMap(x => of(x + x).pipe(map(y => x + y))))
• switchMap|switchMapTo: switchMap and switchMapTo no longer take resultSelector arguments, to get the same functionality use switchMap and map in combination: source.pipe(switchMap(x => of(x + x).pipe(y => x + y))).
• mergeMapTo: mergeMapTo no longer accepts a resultSelector, to get this functionality, you'll want to use mergeMap and map together: source.pipe(mergeMap(() => inner).pipe(map(y => x + y)))
• fromEventPattern: no longer supports a result selector, use map instead: fromEventPattern(fn1, fn2, fn3) becomes fromEventPattern(fn1, fn2).pipe(map(fn3))

6.0.0-alpha.4 (2018-03-13)

Bug Fixes

• ESM: Add [operators|ajax|websocket|testing]/package.json for ESM support, fixes #3227 (#3356) (725dcb4)
• fromEvent: Defines toString to fix Closure compilations (#3417) (1558b43)
• fromEvent: pass options in unsubscribe (f1872b0), closes #3349
• rxjs: add exports for symbols/interfaces that were missing (#3380) (1622ee0)
• rxjs: make sure esm imports from index.js by default, not Rx.js (#3316) (c2b00f4), closes #3315
• rxjs: once again exports custom error types (#3371) (4465a9f)
• rxjs: remove types.ts importing from itself. (#3383) (8fd50ad)
• correct internal module paths to be systemjs compatible (#3412) (35abc9d)
• Symbol.iterator: correctly handle case where Symbol constructor itself is not defined (#3394) (6725be1)
• typings: fixed some cases where multicast and publish would not return a ConnectableObservable (#3320) (ddffecc)
• reexport Symbol.observable typings patch (4c4d7b0)
• remove the root operators.ts because it overshadows operators/package.json (184b6d4)

Code Refactoring

• Observable.if: remove ts hacks from Observable (f46f261)
• Rx.ts: move Rx.ts to internal (#3400) (7ad2119)

Features

• bindCallback: remove result selector (2535641)
• bindNodeCallback: remove resultSelector (26e6e5c)
• exhaustMap: simplify interface (42589d0)
• first: simplify interface (a011338)
• forkJoin: simplify interface (4d2338b)
• fromEvent: remove resultSelector (197f449)
• fromEvent: will now emit an array when event emits multiple arguments (51b37fd)
• fromEventPattern: removed resultSelector (6b34f9f)
• last: simplify interface (3240419)
• mergeMap|concatMap|concatMapTo: simplified the signatures (d293245)
• mergeMapTo: simplify interface (582c7be)
• never: no longer export never function (#3386) (53debc8)
• switchMap|switchMapTo: simplify interface (959fb6a)
• Symbol.iterator: no longer polyfilled (#3389) (6319f3c)
• Symbol.observable: is no longer polyfilled (#3387) (4a5aaaf)
• throwIfEmpty: adds throwIfEmpty operator (#3368) (9b21458)
• typings: updated typings for combineAll, mergeAll, concatAll, switch, exhaust, zipAll (#3321) (f7e4c02)
• umd: UMD now mirrors export schema for ESM and CJS (#3426) (556c904)

BREAKING CHANGES

• Symbol.observable: RxJS will no longer be polyfilling Symbol.observable. That should be done by an actual polyfill library. This is to prevent duplication of code, and also to prevent having modules with side-effects in rxjs.
• mergeMap|concatMap|concatMapTo: mergeMap, concatMap and concatMapTo no longer support a result selector, if you need to use a result selector, use the following pattern: source.mergeMap(x => of(x + x).pipe(map(y => y + x)) (the pattern would be the same for concatMap).
• bindCallback: removes result selector, use map instead: bindCallback(fn1, fn2)() becomes bindCallback(fn1)().pipe(map(fn2))
• Rx.ts: importing from rxjs/Rx is no longer available. Upcoming backwards compat solution will allow that
• Symbol.iterator: We are no longer polyfilling Symbol.iterator. That would be done by a proper polyfilling library
• Observable.if: TypeScript users using Observable.if will have to cast Observable as any to get to if. It is a better idea to just use iif directly via import { iif } from 'rxjs';
• bindNodeCallback: resultSelector removed, use map instead: bindNodeCallback(fn1, fn2)() becomes bindNodeCallback(fn1)().pipe(map(fn2))
• never: no longer exported. Use the NEVER constant instead.
• fromEvent: result selector removed, use map instead: fromEvent(target, 'click', fn) becomes fromEvent(target, 'click').pipe(map(fn))
• last: no longer accepts resultSelector argument. To get this same functionality, use map.
• first: no longer supports resultSelector argument. The same functionality can be achieved by simply mapping either before or after first depending on your use case.
• exhaustMap: resultSelector no longer supported, to get this functionality use: source.pipe(exhaustMap(x => of(x + x).pipe(map(y => x + y))))
• switchMap|switchMapTo: switchMap and switchMapTo no longer take resultSelector arguments, to get the same functionality use switchMap and map in combination: source.pipe(switchMap(x => of(x + x).pipe(y => x + y))).
• mergeMapTo: mergeMapTo no longer accepts a resultSelector, to get this functionality, you'll want to use mergeMap and map together: source.pipe(mergeMap(() => inner).pipe(map(y => x + y)))
• fromEventPattern: no longer supports a result selector, use map instead: fromEventPattern(fn1, fn2, fn3) becomes fromEventPattern(fn1, fn2).pipe(map(fn3))

6.0.0-alpha.3 (2018-02-06)

Bug Fixes

• animationFrame.spec: spec description fix (#3140) (ab6c325)
• debounce: support scalar selectors (#3236) (1548393), closes #3232
• forkJoin: catch and forward selector errors (#3261) (e57bbb7), closes #3216
• Observable: expose pipe rest parameter overload (#3292) (7ff5bc3)
• onErrorResumeNext: no longer holds onto subscriptions too long (abbbdad), closes #3178
• scheduler: prevent unwanted clearInterval (#3226) (d7cfb42), closes #3042
• timer: multiple subscriptions to timer(Date) behaves correctly (aafa7ff), closes #3252
• typings: correct compilation warnings from missing types in tests (3aad6bc)
• typings: relax debounce selector type (c419ab4), closes #3164
• typings: relax throttle selector type (#3205) (e83fda7), closes #3204
• typings: the return type of factory of defer should be ObservableInput (#3211) (dc41a5e)

Features

• empty: empty() returns the same instance (5c7c749)
• EMPTY: observable constant EMPTY now exported (08fb074)
• never: always return the same instance (#3249) (d57fa52)
• rxjs: move rxjs/create into rxjs (#3299) (6711fe2)
• throwError: functional version of throwError (639236e)

BREAKING CHANGES

• rxjs: rxjs/create items are now exported from rxjs
• throwError: Observable.throw no longer available in TypeScript without a cast
• empty: empty() without a scheduler will return the same instance every time.
• empty: In TypeScript, empty() no longer accepts a generic argument, as it returns Observable<never>
• never: never() always returns the same instance
• never: TypeScript typing for never() is now Observable<never> and the function no longer requires a generic type.

6.0.0-alpha.2 (2018-01-14)

Bug Fixes

• build: properly outputs subdirectories like rxjs/operators (34fe560)

6.0.0-alpha.1 (2018-01-12)

Bug Fixes

• Revert "fix(scheduler): prevent unwanted clearInterval (#3044)" (ad5c7c6)
• Revert "fix(scheduler): prevent unwanted clearInterval (#3044)" (64f9285)
• debounceTime: synchronous reentrancy of debounceTime no longer swallows the second value (#3218) (598e9ce), closes #2748
• dependency: move symbol-observable into devdependency (4400628)
• IteratorObservable: get new iterator for each subscription (#2497) (1bd0a58), closes #2496
• Observable.toArray: Fix toArray with multiple subscriptions. (#3134) (3390926)
• SystemJS: avoid node module resolution of pipeable operators (#3025) (0f3cf71), closes #2971 #2996 #3011
• tap: make next optional (#3073) (e659f0c), closes #2534
• TSC: Fixing TSC errors. Fixes #3020 (01d1575)
• typings: the return type of project of mergeScan should be ObservableInput (23fe17d)

Chores

• TypeScript: Bump up typescript to latest (#3009) (2f395da)

Code Refactoring

• asap: Remove setImmediate polyfill (5eb6af7)
• distinct: Remove Set polyfill (68ee499)
• groupBy: Remove Map polyfill (74b5b1a)

Features

• Observable: unhandled errors are now reported to HostReportErrors (#3062) (cd9626a)
• reorganize: move ./interfaces.ts to internal/types.ts (cfbfaac)
• reorganize: internal utils hidden (70058cd)
• reorganize: add rxjs/create exports (c9963bd)
• reorganize: ajax observable creator now exported from rxjs/ajax (e971c93)
• reorganize: all patch operators moved to internal directory (7342401)
• reorganize: export noop and identity from rxjs (810c4d0)
• reorganize: export Notification from rxjs (8809b48)
• reorganize: export schedulers from rxjs (abd3b61)
• reorganize: export Subject, ReplaySubject, BehaviorSubject from rxjs (bd683ca)
• reorganize: export the pipe utility function from rxjs (4574310)
• reorganize: hid testing implementation details (b981666)
• reorganize: move observable implementations under internal directory (2d5c3f8)
• reorganize: move operator impls under internal directory (207976f)
• reorganize: move top-level impls under internal directory (c3bb705)
• reorganize: moved symbols to be internal (80783ab)
• reorganize: operators all exported from rxjs/operators (b1f8bfe)
• reorganize: websocket subject creator now exported from rxjs/websocket (5ac62c0)

BREAKING CHANGES

• webSocket: webSocket creator function now exported from rxjs/websocket as websocket.
• IteratorObservable: IteratorObservable no longer share iterator between subscription
• utils: Many internal use utilities like isArray are now hidden under rxjs/internal, they are implementation details and should not be used.
• testing observables: HotObservable and ColdObservable, and other testing support types are no longer exported directly.
• creation functions: All create functions such as of, from, combineLatest and fromEvent should now be imported from rxjs/create.
• types and interfaces: Can no longer explicitly import types from rxjs/interfaces, import them from rxjs instead
• symbols: Symbols are no longer exported directly from modules such as rxjs/symbol/observable please use Symbol.observable and Symbol.iterator (polyfills may be required)
• deep imports: Can no longer deep import top-level types such as rxjs/Observable, rxjs/Subject, rxjs/ReplaySubject, et al. All imports should be done directly from rxjs, for example: import \{ Observable, Subject \} from 'rxjs';
• schedulers: Scheduler instances have changed names to be suffixed with Scheduler, (e.g. asap -> asapScheduler)
• operators: Pipeable operators must now be imported from rxjs like so: import { map, filter, switchMap } from 'rxjs/operators';. No deep imports.
• ajax: Ajax observable should be imported from rxjs/ajax.
• Observable: You should no longer deep import custom Observable implementations such as ArrayObservable or ForkJoinObservable.
• _throw: _throw is now exported as throwError
• if: if is now exported as iif
• operators: Deep imports to rxjs/operator/* will no longer work. Again, pipe operators are still where they were.
• error handling: Unhandled errors are no longer caught and rethrown, rather they are caught and scheduled to be thrown, which causes them to be reported to window.onerror or process.on('error'), depending on the environment. Consequently, teardown after a synchronous, unhandled, error will no longer occur, as the teardown would not exist, and producer interference cannot occur
• distinct: Using distinct requires a Set implementation and must be polyfilled in older runtimes
• asap: Old runtimes must polyfill Promise in order to use ASAP scheduling.
• groupBy: Older runtimes will require Map to be polyfilled to use groupBy
• TypeScript: IE10 and lower will need to polyfill Object.setPrototypeOf
• operators removed: Operator versions of static observable creators such as merge, concat, zip, onErrorResumeNext, and race have been removed. Please use the static versions of those operations. e.g. a.pipe(concat(b, c)) becomes concat(a, b, c).

5.5.6 (2017-12-21)

Bug Fixes

• Observable: rethrow errors when syncErrorThrowable and inherit it from destination. Fixes #2813 (541b49d)

5.5.5 (2017-12-06)

Support Added

• Bazel: Add files to support users that want Bazel builds with RxJS (12dac3b)

5.5.4 (2017-12-05)

Bug Fixes

• scheduler: resolve regression on angular router with zones (#3158) (520b06a)
• publish: re-publish after having built with proper version of TypeScript. (f0ff5bc, closes#3155)

5.5.3 (2017-12-01)

Bug Fixes

• concatStatic: missing exports for mergeStatic and concatStatic (#2999) (cae5f9b)
• scheduler: prevent unwanted clearInterval (#3044) (7d722d4), closes #3042
• SystemJS: avoid node module resolution of pipeable operators (#3025) (d77e3d7), closes #2971 #2996 #3011
• typings: fix subscribe overloads (#3053) (1a9fd42), closes #3052

5.5.2 (2017-10-25)

Bug Fixes

• package: fixed import failures in Webpack (#2987) (e16202d)
• typings: improved type inference for arguments to publishReplay (#2992) (0753ff7), closes #2991
• typings: ensure TS types for zip and combineLatest are properly inferred. (b8e6cf8)
• typings: publish variants will properly return ConnectableObservable(#2983) (d563bfa)

5.5.1 (2017-10-24)

Bug Fixes

• build: Remove module and es2015 keys to avoid resolution conflicts (5073139)
• ajaxobservable: fix operator import path (d9b62ed)

5.5.0 (2017-10-18)

Bug Fixes

• build: CJS sourceMaps now inlined into sourcesContent (39b4af5), closes #2934

Features

• publishReplay: add selector function to publishReplay (#2885) (e0efd13)

5.5.0-beta.7 (2017-10-13)

(Due to a publish snafu, there is no 5.5.0-beta.6) (womp womp 👎)

Bug Fixes

• build: sourceMaps updated to support CJS properly again (75f7f11), closes #2934
• flatMap: reexport flatMap as alias of mergeMap (#2920) (9922c02)
• publish: correct the name and republish to sync packages (464b115)
• shareReplay: no longer exporting function unnecessarily (#2928) (e159578)
• shareReplay: properly uses lift (#2924) (3d9cf87), closes #2921
• toPromise: include toPromise in build output (#2923) (f55bfa5), closes #2922

5.5.0-beta.5 (2017-10-06)

Bug Fixes

• toPromise: remove lettable version of toPromise (031edca), closes #2868

Features

• toPromise: now exists as a permanent method on Observable (2e49a5c)

5.5.0-beta.4 (2017-10-06)

Bug Fixes

• publish: fix selector typings (#2891) (9ee234d), closes #2889
• shareReplay: properly retains history on subscribe (#2910) (accbcd0), closes #2908
• subscribeOn: remove subscribeOn from reexport to support treesha… (#2899) (fb51a02)

5.5.0-beta.3 (2017-10-03)

Bug Fixes

• build: revert to 5.4.x build output for CJS & add configurable support for ESM (#2878) (167456a)
• concatAll: use higher-order lettable version of concatAll (60c96ab)
• mergeAll: use higher-order lettable version of mergeAll (f0b703b)

5.5.0-beta.2 (2017-09-27)

Bug Fixes

• build: make CJS references to import X from '../operators' work correctly with SystemJS (#2874) (3dd4cc4)

5.5.0-beta.1 (2017-09-27)

Bug Fixes

• package: published from a Linux machine to prevent a strange issue where the Observable directory was not showing up when installed on some Linux environments.
• build: fix source maps by adding back sources and fixing path (#2872) (daaf424)
• package: remove src directory and fix typings location (#2866) (c57eea7)

Features

• global: export lettables as Rx.operators (#2862) (ba2f586), closes #2861

5.5.0-beta.0 (2017-09-22)

Important! Checkout the explanation of the new lettable operators features here

Bug Fixes

• package: correct errors generated during rollup for UMD generation (#2839) (124cc93)
• partition: update TypeScript signature to match docs and filter operator (#2819) (755df9b)
• subscribeToResult: throw error in subscriber with inner observable (d7bffa9), closes #2618

Features

• ajax: Include the response on instances of AjaxError (3f6553c)
• audit: add higher-order lettable version of audit (e2daefe)
• auditTime: add higher-order lettable version of auditTime (9e963aa)
• buffer: add higher-order lettable version of buffer (d8ca9de)
• bufferCount: add higher-order lettable version of bufferCount (0ae2ed5)
• bufferTime: add higher-order lettable version of bufferTime operator (0377ca6)
• bufferToggle: add higher-order lettable version of bufferToggle (ea1c3ee)
• bufferWhen: add higher-order lettable version of bufferWhen (ec3eceb)
• catchError: add higher-order lettable version of catch (408a2af)
• combineAll: add higher-order lettable version of combineAll (97704b3)
• combineLatest: add higher-order lettable version of combineLatest (b7154f2)
• concatMap: add higher-order lettable version of concatMap (c4125ff)
• concatMapTo: add higher-order lettable version of concatMapTo (0a6672e)
• count: add higher-order lettable version of count (caf713e)
• debounce: add higher-order lettable version of debounce (cb8ce46)
• debounceTime: add higher-order lettable version of debounceTime (df0d439)
• delay: add higher-order lettable version of delay (7efb803)
• delayWhen: add higher-order lettable version of delayWhen (cb91c3f)
• dematerialize: add higher-order lettable version of dematerialize (b5948f9)
• distinct: add higher-order lettable version of distinct (0429a69)
• distinctUntilChanged: add higher-order lettable version of distinctUntilChanged (b2725e7)
• distinctUntilKeyChanged: add higher-order lettable version of distinctUntilKeyChanged (9db141c)
• elementAt: add higher-order lettable version of elementAt (b8e956b)
• every: add higher-order lettable version of every (13f3503)
• exhaust: add higher-order lettable version of exhaust (b145dca)
• exhaustMap: add higher-order lettable exhaustMap (b134e0c)
• expand: add higher-order lettable expand (6ec8a19)
• filter: add higher-order lettable version of filter (2848556)
• finalize: add higher-order lettable version of finally, called finalize (cfeae9f)
• find: add higher-order lettable version of find (ff6d5af)
• findIndex: add higher-order lettable findIndex (40e680e)
• first: add higher-order lettable first (33eac1e)
• groupBy: add higher-order lettable groupBy (5281229)
• ignoreElements: add higher-order lettable version of ignoreElements (68286d4)
• isEmpty: add higher-order lettable version of isEmpty (aad1833)
• last: add higher-order lettable version of last (bf33b97)
• lettables: add higher-order lettable versions of concat, concatAll, mergeAll (d7e8be7)
• map: add higher-order lettable map operator (ce40b2d)
• mapTo: add higher-order lettable version of mapTo (e97530f)
• materialize: add higher-order lettable materialize operator (ce42477)
• merge: add higher-order lettable version of merge (#2809) (3136403)
• mergeMap: add higher-order lettable version of mergeMap (417efde)
• mergeMapTo: add higher-order lettable version of mergeMapTo (653b47a)
• mergeScan: add higher-order lettable version of mergeScan (fde7205)
• multicast: add higher-order lettable variant of multicast (fb6014d)
• observeOn: add higher-order lettable version of observeOn (feb0f5a)
• onErrorResumeNext: add higher-order lettable version of onErrorResumeNext (badec6a)
• operators: higher-order lettables of reduce, min, max and defaultIfEmpty added (9974fc2)
• package: rxjs distribution now supports main, module and es2015 keys in package.json (988e1af)
• pairwise: add higher-order lettable version of pairwise (bb21a44)
• partition: add higher-order lettable version of partition (595e588)
• pipe: add pipe method ot Observable (9f6312d)
• pipe: add pipe utility function(42f9daf)
• pluck: add higher-order lettable version of pluck (8ab0914)
• publish: add higher-order lettable variant of publish (4ccf794)
• publishBehavior: add higher-order lettable version of publishBehavior (e911aef)
• publishLast: add higher-order lettable version of publishLast (684728c)
• publishReplay: add higher-order lettable version of publishReplay (2958917)
• race: add higher-order lettable version of race (e646851)
• refCount: add higher-order lettable version of refCount (21fba63)
• repeat: add higher-order lettable version of repeat (8473fe5)
• repeatWhen: add higher-order lettable version of repeatWhen (1d1cecd)
• retry: add higher-order lettable version of retry (28e9b13)
• retryWhen: add higher-order lettable version of retryWhen (1290e3c)
• sample: add higher-order lettable version of sample (8c73e6e)
• sampleTime: add higher-order lettable version of sampleTime (ba6a9ce)
• scan: add higher-order lettable version of scan (2cc5d75)
• sequenceEqual: add higher-order lettable version of sequenceEqual (7cd3165)
• share: add higher-order lettable version of share (f10c42e)
• shareReplay: add higher-order lettable version of shareReplay (e8be197)
• single: add higher-order lettable version of single (3bc050a)
• skip: add higher-order lettable version of skip (baed383)
• skipLast: add higher-order lettable version of skipLast (6e1ff3c)
• skipUntil: add higher-order lettable version of skipUntil (6cc2cd6)
• skipWhile: add higher-order lettable version of skipWhile (76d8ffa)
• subscribeOn: add higher-order lettable version of subscribeOn (866af37)
• switchAll: add higher-order lettable version of switch (2f12572)
• switchMap: add higher-order lettable version of switchMap (b6e5b56)
• switchMapTo: add higher-order lettable version of switchMapTo (2640184)
• take: add higher-order lettable version of take (089a5a6)
• takeLast: add higher-order lettable version of takeLast (cd7e7dd)
• takeUntil: add higher-order lettable version of takeUntil (bb2ddaa)
• takeWhile: add higher-order lettable version of takeWhile (f86c862)
• tap: add higher-order lettable version of do (f85c60e)
• throttle: add higher-order lettable version of throttle (e4dd1fd)
• throttleTime: add higher-order lettable version of throttleTime (34a592d)
• timeInterval: add higher-order lettable version of timeInterval (fcad034)
• timeout: add higher-order lettable version of timeout (2546750)
• timeoutWith: add higher-order lettable version of timeoutWith (bd7f5ed)
• timestamp: add higher-order lettable version of timestamp (a780bf2)
• toArray: add higher-order lettable version of toArray (82480cf)
• toArray: add higher-order lettable version of toArray (a03a50c)
• toPromise: add higher-order lettable version of toPromise (1627da2)
• window: add higher-order lettable version of window (9f6373e)
• windowCount: add higher-order lettable version of windowCount (2a9e54c)
• windowTime: add higher-order lettable version of windowTime (29ffa1b)
• windowToggle: add higher-order lettable version of windowToggle (81ec389)
• windowWhen: add higher-order lettable version of windowWhen (0b73208)
• withLatestFrom: add higher-order lettable version of withLatestFrom (509c97c)
• zip: add higher-order lettable version of zip (8a9b9b2)
• zipAll: add higher-order lettable version of zipAll (f6bd51f)

5.4.3 (2017-08-10)

Bug Fixes

• compilation: compiles under typescript 2.4.2 (#2780) (d2a32f9)
• exports: add exports for missing static operators: generate, (08c4196)

5.4.2 (2017-07-05)

Bug Fixes

• Notification: Don't reference this from static methods. (9f8e375)
• Subject: lift signature is now appropriate for stricter TypeScript 2.4 checks (#2722) (9804de7)

5.4.1 (2017-06-14)

Bug Fixes

• ajax: Only set timeout & responseType if request is asynchronous (#2486) (380fbcf)
• audit: will now properly mirror source if durations are Observable.empty() (#2595) (6ded82e)
• elementAt: will now properly unsubscribe when it completes or errors (#2501) (a400cab)
• ErrorObservable: will now propagate errors properly when used in a catch after fromPromise. (#2552) (cf88a20)
• groupBy: group duration notifiers will now properly unsubscribe and clean up (#2662) (ab92083), closes #2660 #2661
• Observable: errors thrown in observer/handlers without an operator applied will no longer be swallowed (#2626) (c250afc), closes #2565
• reduce: type definitions overloads for TypeScript are now in proper order (#2523) (ccc0647)
• Schedulers: Fix issue where canceling an asap or animationFrame action early could throw (#2638) (fc39043)

5.4.0 (2017-05-09)

Features

• shareReplay: adds shareReplay variant of publishReplay (#2443) (5a2266a)
• skipLast: add skipLast operator (#2316) (4ffbbe5), closes #1404
• TypeScript: fromPromise accepts PromiseLike object (#2505) (ade1fd5)

5.3.3 (2017-05-09)

Bug Fixes

• delayWhen: correctly handle synchronous duration observable (#2589) (695f280), closes #2587
• race: allow TypeScript support for array of observables other than rest param (#2548) (ace553c)
• Subscriber: do not call complete with undefined value param (#2559) (3d63de2)

(NOTE: 5.3.2 was a broken release and was removed)

5.3.1 (2017-05-02)

Bug Fixes

• AsyncAction: rescheduling an action with the same delay before it has executed will now schedule appropriately. (#2580) (281760e)
• closure: make root.ts work with closure (#2546) (0ecf55d)
• tests: add missing babel-polyfill to package.json (b277ce9), closes #2261
• withLatestFrom: change from hot to cold observable in marble test (0c65446), closes #2526

5.3.0 (2017-04-03)

Bug Fixes

• catch: return type is now the union of input types (#2478) (840def0)
• forEach: fix a temporal dead zone issue in forEach. (#2474) (e9e9801)
• multicast: Ensure ConnectableObservables returned by multicast are state-isolated. (aaa9e6b)
• reduce: proper TypeScript signature overload ordering (#2382) (f6a4951), closes #2338
• SafeSubscriber: SafeSubscriber shouldn't mutate incoming Observers. (a1778e0)
• timeout: Cancels scheduled timeout, if no longer needed (3e9d529), closes #2134 #2244 #2355 #2347 #2353 #2254 #2372 #1301
• zipAll: complete when the source is empty (712fece)

Features

• delayWhen: add index to the selector function (5d6291e)
• symbol exports: symbols now also exported without $$ prefix to work with Babel UMD exporting (#2435) (747bef6), closes #2415

Performance Improvements

• bufferCount: optimize bufferCount operator (#2359) (28d0883)

April Fools

• smooth: smooth() was never really a thing. Sorry, folks. :D

5.2.0 (2017-02-21)

Bug Fixes

• ajax: will set withCredentials after open on XHR for IE10 (#2332) (0ab1d3b)
• bindCallback: emit undefined when callback is without arguments (915a2a8)
• bindNodeCallback: emit undefined when callback has no success arguments (8b81fc6), closes #2254
• bindNodeCallback: errors thrown in callback will be scheduled if a scheduler is provided (#2344) (82ec4f1)
• concat: will now return Observable when given a single object implementing Symbol.observable (#2387) (f5d035a)
• ErrorObservable: remove type constraint to error value (2f951cd), closes #2395
• forkJoin: add type signature for single observable with selector (7983b91), closes #2347
• merge: return Observable when called with single lowerCaseO (85752eb)
• mergeAll: introduce variant support <T, R> for mergeMap (656f2b3), closes #2372
• single: predicate function receives indices starting at 0 (#2396) (c81882f)
• subscribeToResult: accept array-like as result (14685ba)

Features

• webSocket: Add binaryType to config object (86acbd1), closes #2353
• windowTime: maxWindowSize parameter in windowTime operator (381be3f), closes #1301

5.1.1 (2017-02-13)

Bug Fixes

• bindCallback: input function context can now be properly set via output function (#2319) (cb91c76)
• bindNodeCallback: input function context can now be properly set via output function (#2320) (3ec315d)
• Subscription: fold ChildSubscription logic into Subscriber to prevent operators from leaking ChildSubscriptions. (#2360) (22e4c17), closes #2244 #2355

5.1.0 (2017-02-01)

Bug Fixes

• catch: update the catch operator to dispose inner subscriptions if the catch subscription is di (#2271) (8a1e089)
• combineLatest: Don't mutate array of observables passed to (#2276) (9b73c46)
• ISubscription: update type definition of ISubscription::closed (#2249) (0c304a2)
• Observable: Ensure the generic type of the Observer passed to Observable's initializer function is the same. (51a0bc1), closes #2166
• Observable: errors thrown during subscription are now properly sent down error channel (#2313) (d4a9aac), closes #1833
• reduce: index will properly start at 1 if no seed is provided, to match native Array reduce behavior (30a4ca4), closes #2290
• repeatWhen: resulting observable will wait for the source to complete, even if a hot notifier completes first. (#2209) (c65a098), closes #2054
• Subject: ensure subject properly throws ObjectUnsubscribedError when unsubscribed then resubscribed to (#2318) (41489eb)
• TestScheduler: helper methods return proper types, HotObservable and ColdObservable instead of Observable (#2305) (758aae9)
• windowTime: ensure windows created when only a timespan is passed are closed and cleaned up properly. (#2278) (d4533c4)

Features

• fromEventPattern: support optional removeHandler (86960c2)
• fromEventPattern: support pass signal from addHandler to removeHandler (01d0622)

5.0.3 (2017-01-05)

Bug Fixes

• observeOn: seal memory leak involving old notifications (9664a38), closes #2244
• Subscription: add will return Subscription that removes itself when unsubscribed (375d4a5)
• TypeScript: interfaces that accepted Scheduler now accept IScheduler interface (a0d28a8)

5.0.2 (2016-12-23)

Bug Fixes

• ajax: upload progress is now set correctly (#2200) (1a83041)
• groupBy: Fix groupBy to dispose of outer subscription. (#2201) (2269618)

5.0.1 (2016-12-13)

Bug Fixes

• TypeScript: pin to TypeScript 2.0.x, fix errors with Error subclassing (300504c)

5.0.0 (2016-12-13)

Bug Fixes

• race: unsubscribe raced observables with immediate scheduler (#2158) (7dd533b)
• SubscribeOnObservable: Add the source subscription to the action disposable so the source will (64e3815)

5.0.0-rc.5 (2016-12-07)

Bug Fixes

• AjaxObservable: catch XHR send failures to observer (#2159) (128fb9c)
• distinctKey: Removed accidental leftover reference of distinctKey (9fd8096), closes #2161
• errors: Better error message when you return non-observable things, (#2152) (86a909c), closes #215
• event: uses Object.prototype.toString.call on objects (#2143) (e036e79)
• typings: type guard support for last, first, find and filter. (5f2e849)

Features

• timeout: remove errorToSend argument, always throw TimeoutError (#2172) (98ea3d2)

BREAKING CHANGES

• timeout: timeout no longer accepts the errorToSend argument

related #2141

5.0.0-rc.4 (2016-11-19)

Bug Fixes

• partition: handles thisArg as expected (#2138) (6cf7296)
• timeout: throw traceable TimeoutError (#2132) (9ebc46b)

5.0.0-rc.3 (2016-11-15)

Bug Fixes

• typings: You no longer have to install the type definition for chai (#2112)

Features

• filter: support type guards without casting (68b7922)
• find: support type guards without casting (9058bf6)
• first: support type guards without casting (3aa1988)
• last: support type guards without casting (07ecd5e)

5.0.0-rc.2 (2016-11-05)

Bug Fixes

• AjaxObservable: remove needless type param R from AjaxObservable.getJSON() (#2069) (0c3d4a4)
• bufferCount: will behave as expected when startBufferEvery is less than bufferSize (#2076) (d13dbb4), closes #2062
• build_docs: fix doc building (#1974) (1bbbe8b)
• ErrorObservable: Add generic error type for ErrorObservable. (#2071) (9df86ba)
• first: will now only emit one value in recursive cases (#2100) (a047e7a), closes #2098
• fromEvent: Throw if event target is invalid (#2107) (147ce3e)
• IteratorObservable: clarify the return type of IteratorObservable.create() (#2070) (4f0f865)
• IteratorObservable: Observables from generators will now finalize when subscription ends (22d286a), closes #1938
• multicast: fix a bug that caused multicast to omit messages after termination (#2021) (44fbc14)
• Notification: materialize output will now match Rx4 (#2106) (c83bab9), closes #2105
• Object.assign: stop polyfilling Object assign (#2080) (b5f8ab3)
• Observable/Ajax: mount properties to origin readystatechange fn (#2025) (76a9abb)
• operator/do: fix typings (9a40297)
• reduce/scan: both scan/reduce operators now accepts undefined itself as a valid seed (#2050) (fee7585), closes #2047
• ReplaySubject: observer now subscribed prior to running subscription function (#2046) (fea08e9), closes #2044
• sample: source is now subscribed to before the notifier (ffe99e8), closes #2075
• Symbol.iterator: will not polyfill Symbol iterator unless Symbol exists (#2082) (1138c99)
• typings: fixed Subject.lift to have the same shape as Observable.lift (b07f597)
• WebSocketSubject.prototype.multiplex: no longer nulls out socket after first unsubscribe (#2039) (a5e9cfe), closes #2037

Features

• distinct: remove distinctKey, distinct signature change and perf improvements (#2049) (89612b2), closes #2009
• groupBy: Adds subjectSelector argument to groupBy (#2023) (f94ceb9)
• typescript: remove dependency to 3rd party es2015 definition (#2027) (4c31974), closes #2016

BREAKING CHANGES

• Notification: Notification.prototype.exception is now Notification.prototype.error to match Rx4 semantics
• Symbol.iterator: RxJS will no longer polyfill Symbol.iterator if Symbol does not exist. This may break code that inadvertently relies on this behavior
• Object.assign: RxJS will no longer polyfill Object.assign. It does not require Object.assign to function, however, your code may be inadvertently relying on this polyfill.
• AjaxObservable: Observable.ajax.getJSON() now only supports a single type parameter, getJSON<T>(url: string, headers?: Object): Observable<T>. The extra type parameter it accepted previously was superfluous.
• distinct: distinctKey has been removed. Use distinct
• distinct: distinct operator has changed, first argument is an optional keySelector. The custom compare function is no longer supported.

5.0.0-rc.1 (2016-10-11)

Bug Fixes

• AjaxObservable: Fix for #1921 exposed AjaxObservable unsubscription error calling xhr.abort(). (4d23f87)
• AnonymousSubject: is now exposed on Rx namespace (0a6f049), closes #2002
• bufferTime: no errors with take after bufferTime with maxBufferSize (ecec640), closes #1944
• docs: Fix esdoc for Observable.merge spread argument (b794e9b)
• Observer: fix Observable#subscribe() signature to suggest correct usable (459d2a2)
• operator: Fix take to complete when the source is re-entrant. (86615cb)
• root: find global context (window/self/global) in a more safe way (a098132), closes #1930
• schedulers: Queue, Asap, and AnimationFrame Schedulers should be Async if delay > 0 (d5c682c)
• util/toSubscriber: Supplies the Subscriber constructor with emptyObserver as destination if no (8e7e4e3)
• WebSocketSubject: ensure all internal state properly reset when socket is nulled out (62d242e), closes #1863

Features

• cache: remove cache operator (1b23ace)
• ES2015: stop publishing rxjs-es, ES2015 output no longer included in @reactivex/rxjs package under /dist/es6 (6be9968), closes #1671
• filter: Observable.filter() can take type guard as the predicate function (d62fbf0)
• find: Observable.find() can take type guard as the predicate function (b952718)
• first: Observable.first() can take type guard as the predicate function (f99ca49)
• last: Observable.last() can take type guard as the predicate function (76a8a57)
• operators: Use lift in the operators that don't currently use lift. (68af9ef)
• TypeScript: update TypeScript to v2.0 (3478b0b)

BREAKING CHANGES

• cache: The .cache() operator has been removed, pending further discussion (1b23ace)
• ES2015: rxjs-es is no longer being published
• ES2015: @reactivex/rxjs no longer has /dist/es6 output

related #2016 related #1992

• package.json: TypeScript definitions are now for TS 2.0 and higher

Even if we use getter for class, they are marked with readonly properties in d.ts.

• operators: Removes MulticastObservable subclass in favor of a MulticastOperator.

5.0.0-beta.12 (2016-09-09)

Bug Fixes

• ajaxObservable: remove implicit dependency to map operator patch (1744ae9), closes #1874
• AjaxObservable: return null value from JSON.Parse (#1904) (6ba374e)
• catch: removed unneeded overload for catch (dd0e586)
• max: do not return comparer values (f454e93), closes #1892
• min: do not return comparer values (222fd17), closes #1892
• operators: export reserved name operators on prototype (34c39dd), closes #1924
• VirtualTimeScheduler: remove default maxFrame limit (1de86f1), closes #1889
• WebSocketSubject: pass constructor errors onto observable (49c7d67)

Features

• operator: Add repeatWhen operator (c288d88)
• sequenceEqual: adds sequenceEqual operator (3c30293), closes #1882

5.0.0-beta.11 (2016-08-09)

Bug Fixes

• ajaxObservable: only set default Content-Type header when no body is sent (#1830) (5a895e8)
• AjaxObservable: drop resultSelector support in ajax method (7a77437), closes #1783
• AsyncSubject: do not allow change value after complete (801f282), closes #1800
• BoundNodeCallbackObservable: cast to any to access to private field in source (54f342f)
• catch: accept selector returns ObservableInput (e55c62d), closes #1857
• combineLatest: emit unique array instances with the default projection (2e30fd1)
• Observable.from: standardise arguments (remove map/context) (aa30af2)
• schedulers: fix asap and animationFrame schedulers to execute across async boundaries. (#182 (548ec2a), closes [(#1820](https://github.com/(/issues/1820) #1814
• subscribeToResult: update subscription to iterables (5d6339a)
• WebSocketSubject: prevent early close (#1831) (848a527), closes [(#1831](https://github.com/(/issues/1831)

Features

• fromEvent: Pass through event listener options (#1845) (8f0dc01)
• PairsObservable: add PairsObservable creation method (26bafff), closes #1804

BREAKING CHANGES

• Observable.from: - Observable.from no longer supports the optional map function and associated context argument. This change has been reflected in the related constructors and their properties have been standardised.
• AjaxObservable: ajax.*() method no longer support resultSelector, encourage to use map instead

5.0.0-beta.10 (2016-07-06)

Bug Fixes

• AjaxObservable: ignore content-type for formdata (#1746) (43d05e7)
• AjaxObservable: support withCredentials for CORS request (8084572), closes #1732 #1711
• babel: fix an issue where babel could not compile Scheduler.async (#1807) (12c5c74), closes [(#1807](https://github.com/(/issues/1807) #1806
• bufferTime: handle closing context when synchronously unsubscribed (4ce4433), closes #1763
• multicast: Fixes multicast with selector to create a new source connection per subscriber. (c3ac852), closes [(#1774](https://github.com/(/issues/1774)
• Subject: allow optional next value in type definition (3e0c6d9), closes #1728
• WebSocketSubject: respect WebSocketCtor, support source/destination arguments in constructor. (#179 (cd8cdd0), closes #1745 #1784

5.0.0-beta.9 (2016-06-14)

Bug Fixes

• cache: get correct caching behavior (#1765) (cb0b806), closes #1628
• ConnectableObservable: fix ConnectableObservable connection handling issue (41ce80c)
• typings: make HotObservable._subscribe protected (1c3d6ea)
• WebSocketSubject: WebSocketSubject will now chain operators properly (#1752) (bf54db4), closes #1745
• window: don't track internal window subjects as subscriptions. (f3357b9)

Performance Improvements

• fromEventPattern: ~3x improvement in speed (3dc1c00)

5.0.0-beta.8 (2016-05-22)

Bug Fixes

• AnonymousSubject: allow anonymous observers as destination (0e2c28b)
• combineLatest: rxjs/observable/combineLatest is now properly exported (21fab73), closes #1722
• ConnectableObservable: fix race conditions in ConnectableObservable and refCount. (d1412bc)
• Rx: remove kitchenSink and DOM, let Rx export all (f5090b4), closes #1650
• ScalarObservable: set _isScalar to false when initialized with a scheduler (5037b3a)
• Subject: correct Subject behaviors to be more like Rx4 (ba9ef2b)
• subscriptions: fixes bug that tracked subscriber subscriptions twice. (29ff794)

Features

• bufferTime: add maxBufferSize optional argument (cf45540), closes #1295
• multicast: subjectfactory allows selectors (32fa3a4)
• onErrorResumeNext: add onErrorResumeNext operator (51e022b), closes #1665
• publish: support optional selectors (0e5991d), closes #1629

Performance Improvements

• combineLatest: avoid splice and indexOf (33599cd)

BREAKING CHANGES

• Subject: Subjects no longer duck-type as Subscriptions
• Subject: Subjects will no longer throw when re-subscribed to if they are not unsubscribed
• Subject: Subjects no longer automatically unsubscribe when completed or errored BREAKING CHANGE: Minor scheduling changes to groupBy to ensure proper emission ordering
• Rx: Rx.kitchenSink and Rx.DOM are removed, Rx export everything.

5.0.0-beta.7 (2016-04-27)

Bug Fixes

• race: handle observables completes immediately (abac3d1), closes #1615
• scan: accumulator passes current index (a3ec896), closes #1614

Features

• Observable.generate: add generate static creation method (c03434c)

5.0.0-beta.6 (2016-04-12)

Bug Fixes

• AjaxObservable: support json responseType on IE (bba13d8), closes #1381
• bufferToggle: accepts closing selector returns promise (b1c575c)
• bufferToggle: accepts promise as openings (3d22c7a)
• bufferToggle: handle closingSelector completes immediately (02239fb)
• typings: explicitly export typings for arguments to functions that destructure configuration objects (ef305af)

Features

• UnsubscriptionError: add messages from inner errors to output message (dd01279), closes #1590

Performance Improvements

• DeferSubscriber: split up 'tryDefer()' into a method to call a factory function. (566f46b)

5.0.0-beta.5 (2016-04-05)

Bug Fixes

• take: make 'take' unsubscribe when it reaches the total (9858aa3)

BREAKING CHANGES

• Operator: Operator.prototype.call has been refactored to include both the destination Subscriber, and the source Observable the Operator is now responsible for describing it's own subscription process. (26423f4)

5.0.0-beta.4 (2016-03-29)

Bug Fixes

• AjaxObservable: enhance compatibility (0ac7e1e)
• Observable.if: accept promise as source (147166e)
• mergeMap: allow concurrent to be set as the second argument for mergeMap and mergeMapTo (c003468)
• observable: ensure the subscriber chain is complete before calling this._subscribe (1631224)
• Symbol: fixed issue where $$observable is not defined (e66b2d8)
• Observable.using: accepts factory returns promise (f8d7d1b)
• windowToggle: handle closingSelector completes immediately (c755587), closes #1487

Features

• ajax: add FormData support in AjaxObservable and add percent encoding for parameters (1f6119c)
• Subscription: add() now returns a Subscription reference (a3f4552)
• timestamp: add timestamp operator (80b1646), closes #1515

Performance Improvements

• forkJoin: improve forkJoin perf slightly by removing unnecessary context tracking (280b985)

BREAKING CHANGES

• Observable: Observable.fromArray was removed since it's deprecated on RxJS 4. You should use Observable.from instead.

5.0.0-beta.3 (2016-03-21)

Bug Fixes

• AjaxObservable: update type definition for AjaxObservable (3f5c269), closes #1382
• deferObservable: accepts factory returns promise (0cb44e1)
• do: fix do operator to invoke observer message handlers in the right context. (67a2f25)
• exhaustMap: remove innersubscription when it completes (7ca0859)
• forEach: ensure that teardown logic is called when nextHandler throws (c50f528), closes #1411
• forkJoin: accepts observables emitting null or undefined (6279d6b), closes #1362
• forkJoin: dispose the inner subscriptions when the outer subscription is disposed (c7bf30c)
• FutureAction: add support for periodic scheduling with setInterval instead of setTimeout (c4f5408)
• Observable: introduce Subscribable interface that will be used instead of Observable in input (2256e7b)
• Observable.prototype.forEach: removed thisArg to match es-observable spec (d5f1bcd)
• package.json: install typings only after packages are installed (a48d796)
• Schedulers: ensure schedulers can be reused after error in execution (202b79a)
• takeLast: fix takeLast behavior to emit correct order (73eb658), closes #1407
• typings: set map function parameter for Observable.from as optional (efa4dc3)

Features

• AsyncScheduler: add AsyncScheduler implementation (4486c1f)
• if: add static Observable.if creation operator. (f7ff7ec)
• let: adds the let operator to Rx.KitchenSink (dca6504)
• using: add static Observable.using creation operator. (6c76593)

BREAKING CHANGES

• Observable.prototype.forEach: thisArg removed to match es-observable spec

5.0.0-beta.2 (2016-02-10)

Bug Fixes

• ajax: fixes error in Chrome accessing responseText when responseType isn't text. (f3e2f73)
• benchpress: fix issues with benchmarks (16894bb)
• every: remove eager predicate calls (74c2c44)
• forkJoin: fix forkJoin to complete if sources Array is empty. (412b13b)
• groupBy: does not emit on unsubscribed group (6d08705)
• groupBy: fix groupBy to use lift(), supports composability (815cfae), closes #1085
• merge/concat: passed scalar observables will now complete properly (c01b92f), closes #1150
• MergeMapSubscriber: clarify type definitions for MergeMapSubscriber's members (4ee5f02)
• Observable.forEach: errors thrown in nextHandler reject returned promise (c5ead88), closes #1184
• Observer: fix typing to allow observation via partial observables with PartialObservable<T (7b6da90)
• Subject: align parameter order to match with RxJS4 (44dfa07), closes #1285
• Subject: throw ObjectUnsubscribedError when unsubscribed (29b630b), closes #859
• Subscriber: adds unsubscription when errors are thrown from user-land handlers. (dc67d21)
• Subscription: fix leaks caused by unsubscribe functions that throw (9e88c2e)
• subscriptions: unsubscribe correctly when a Subscriber throws during synchronous dispatch. (b1698fe)
• typings: don't expose PromiseConstructor dependency (f59225b), closes #1270
• typings: remove R from Operator.call, update operators accordingly (f27902d)
• typings: remove redundant generics from call<T, R> and lift<T, R> (603c9eb)
• windowTime: does not emit on unsubscribed window (595f4ef)

Features

• cache: add cache operator (4308a04)
• delayWhen: add delayWhen operator (17122f9)
• distinct: add distinct operator (94a034d)
• distinctKey: add distinctKey operator (fe4d57f)
• from: allow Observable.from to handle array-like objects (7245005)
• MapPolyfill: implement clear interface (e3fbd05)
• operator: adds inspect and inspectTime operators (54f957b)
• OuterSubscriber: notifyNext passes innersubscriber when next emits (1df8928), closes #1250
• Subject: implement asObservable (aca3dd0), closes #1108
• takeLast: adds takeLast operator. (3583cd3)

Performance Improvements

• catch: remove tryCatch/errorObject for custom tryCatching, 1.3M -> 1.5M ops/sec (35caf74)
• combineLatest: remove tryCatch/errorObject, 156k -> 221k ops/sec (1c7d639)
• count: remove tryCatch/errorObject for custom tryCatching, 1.84M -> 1.97M ops/sec (869718d)
• debounce: remove tryCatch/errorObject for custom tryCatching (90bf3f1)
• distinct: increase perf from 60% of Rx4 to 1000% Rx4 (d026c41)
• do: remove tryCatch/errorObject use, 104k -> 263k ops/sec improvement (ccba39d)
• every: remove tryCatch/errorObject (~1.8x improvement) (14afeb6)
• exhaustMap: remove tryCatch/errorObject (~10% improvement) (a55f459)
• filter: remove tryCatch/errorObject for 2x perf improvement (086c4bf)
• find: remove tryCatch/errorObject (~2x improvement) (aa35b2a)
• first: remove tryCatch/errorObject for custom tryCatching, 970k ops -> 1.27M ops/sec (d8c835a)
• groupBy: remove tryCatch/errorObject for custom tryCatching, 38% faster. (40c43f7)
• last: remove tryCatch/errorObject for custom tryCatching, 960k -> 1.38M ops/sec (243ace3)
• map: 2x increase from removing tryCatch/errorObject (231f729)
• mergeMap: extra 1x factor gains from custom tryCatch member function (c4ce2fb)
• mergeMapTo: remove tryCatch/errorObject (~2x improvement) (42bcced)
• reduce: remove tryCatch/errorObject, optimize calls, 2-3x perf improvement (6186d46)
• scan: remove tryCatch/errorObject for custom tryCatcher 1.75x improvement (338135d)
• single: remove tryCatch/errorObject (~2.5x improvement) (2515cfb)
• skipWhile: remove tryCatch/errorObject (~1.6x improvement) (cf002db)
• Subscriber: double performance adding tryOrUnsub to Subscriber (4e75466)
• switchMap: remove tryCatch/errorObject ~20% improvement (ec0199f)
• switchMapTo: remove tryCatch/errorObject (~2x improvement) (c8cf72a)
• takeWhile: remove tryCatch/errorObject (~6x improvement) (ef6c3c3)
• withLatestFrom: remove tryCatch/errorObject, 92k -> 107k (16% improvement) (e4ccb44)
• zip: extra 1x-2x factor gains from custom tryCatch member function (a1b0e52)

BREAKING CHANGES

• Subject: Subject.create arguments have been swapped to match Rx 4 signature. Subject.create(observable, observer) is now Subject.create(observer, observable)
• Observable patching: Patch files for static observable methods such as of and from can now be found in rxjs/add/observable/of, rxjs/add/observable/from, etc.
• Observable modules: Observable modules for subclassed Observables like PromiseObservable, ArrayObservable are now in appropriately named files like rxjs/observable/PromiseObservable and rxjs/observable/ArrayObservable as opposed to rxjs/observable/fromPromise and rxjs/observable/fromArray, since they're not patching, they simply house the Observable implementations.

5.0.0-beta.1 (2016-01-13)

Bug Fixes

• ajax: ensure post sending values (7aae0a3)
• ajax: ensure that headers are set properly (1100bdd)
• ajax: ensure XHR props are set after open (4a6a579)
• ajax: ensure XHR send is being called (c569e3e)
• ajax: remove unnecessary onAbort handling (ed8240e)
• ajax: response properly based off responseType (b2a27a2)
• ajax: should no longer succeed on 300 status (4d4fa32)
• animationFrame: req/cancel animationFrame has to be called within the context of root. (30a11ee)
• debounceTime: align value emit behavior as same as RxJS4 (5ee11e0), closes #1081
• distinctUntilChanged: implement optional keySelector (f6a897c)
• fromEvent: added spread operator for emitters that pass multiple arguments (3f8eabb)
• fromObservable: expand compatibility for iterating string source (8f7924f), closes #1147
• Immediate: update setImmediate compatibility on IE (39e6c0e), closes #1163
• inspect: remove inspect and inspectTime operators (17341a4)
• Readme: update link to bundle on npmcdn (44a8ca7)
• ReplaySubject: Fix case-sensitive import. (de31f32)
• ScalarObservable: fix issue where scalar map fired twice (c18c42e), closes #1142 #1140
• scheduling: Fixes bugs in scheduled actions. (e050f01)
• Subscriber: errors in nextHandler no longer propagate to errorHandler (f42eed2), closes #1135
• WebSocketSubject: ensure error codes passed to WebSocket close method (3b1655e)
• WebSocketSubject: ensure WebSocketSubject can be resubscribed (861a0c1)
• WebSocketSubject: resultSelector and protocols specifications work properly (580f69a)

Features

• ajax: add resultSelector and improve perf (6df755f)
• ajax: adds ajax methods from rx-dom. (2ca4236)
• bindNodeCallback: add Observable.bindNodeCallback (497bb0d), closes #736
• Observable: add let to allow fluent style query building (5a2014c)
• Observable: add pairwise operator (1432e59)
• Operator: Expose the Operator interface to library consumers (29aa3af)
• pluck: add pluck operator (8026906), closes #1134
• race: add race operator (ee3b593)
• scheduler: adds animationFrame scheduler. (e637b78)
• WebSocketSubject: add basic WebSocketSubject implementation (58cd806)
• WebSocketSubject.multiplex: add multiplex operator to WebSocketSubject (904d617)

BREAKING CHANGES

• inspect: inspect and inspectTime were removed. Use withLatestFrom instead.
• Subscriber/Observable: errors thrown in nextHandlers by consumer code will no longer propagate to the errorHandler.

5.0.0-beta.0 (2015-12-15)

Bug Fixes

• micro-perf: rename immediate to queue scheduler (fe56b28), closes #1040
• micro-perf: use the current scheduler on current-thread tests (3dff5eb)
• operators: emit declarations for patch modules (676f82d)
• test: make explicit unsubscription for observable (7f67b09)
• test: make explicit unsubscription for observable (65e65e2)
• window: fix window() to dispose window Subjects (5168f73)
• windowCount: fix windowCount to dispose window Subjects (f29ee29)
• windowTime: fix windowTime to dispose window Subjects (b73e260)
• windowToggle: fix windowToggle to dispose window Subjects (15ff3f7)
• windowWhen: fix windowWhen to dispose window Subjects (91c1941)

Features

• inspect: added inspect operator (f9944ae)
• inspectTime: add inspectTime operator (6835dcd)
• sample: readd sample operator (e93bffc)
• sampleTime: reimplement sampleTime with RxJS 4 behavior (6b77e69)
• TestScheduler: add createTime() parser to return number (cb8cf6b)

BREAKING CHANGES

• sampleTime: sampleTime now has the same behavior sample(number, scheduler) did in RxJS 4
• sample: sample behavior returned to RxJS 4 behavior
• inspectTime: sampleTime is now inspectTime
• inspect: RxJS 5 sample behavior is now inspect
• extended operators: All extended operators are now under the same operator directory as all others. This means that import "rxjs/add/operator/extended/min" is now import "rxjs/add/operator/min"

5.0.0-alpha.14 (2015-12-09)

Bug Fixes

• every: handle thisArg for scalar and array observables (eae4b00)
• SymbolShim: ensure for function even if Symbol already exists (e942776), closes #999
• SymbolShim: Symbol polyfill is a function (1f57157), closes #988
• timeoutWith: fix to avoid unnecessary inner subscription (6e63752)

Features

• count: remove thisArg (878a1fd)
• distinctUntilChanged: remove thisArg (bfc52d6)
• exhaust: rename switchFirst operators to exhaust (9b565c9), closes #915
• finally: remove thisArg (d4b02fc)
• forEach: add thisArg (14ffce6), closes #878
• single: remove thisArg (43af805)

BREAKING CHANGES

• exhaust: switchFirst is now exhaust
• exhaust: switchFirstMap is now exhaustMap
• forEach: Observable.prototype.forEach argument order changed to accommodate thisArg. Optional PromiseCtor argument moved to third arg from second

5.0.0-alpha.13 (2015-12-08)

Bug Fixes

• Observable: fix circular dependency issue. (b7672f4)
• bufferToggle: fix unsubscriptions of closing Observable (439b641)
• expand: accept scheduler parameter (79e9084), closes #841
• publish: make script generate correct package names (10563d3)
• repeat: preserve Subscriber chain in repeat() (d9a7328)
• retry: preserve Subscriber chain in retry() (b429dac)
• retryWhen: preserve Subscriber chain in retryWhen() (c9cb958)

Features

• AsapScheduler: rename NextTickScheduler to AsapScheduler (3255fb3), closes #838
• BehaviorSubject: add getValue method to access value (33b387b), closes #758
• BehaviorSubject: now throws when getValue is called after unsubscription (1ddf116)
• ObjectUnsubscribedError: add ObjectUnsubscribed error class (39836af)
• Observable: subscribe accepts objects with rxSubscriber symbol (b7672f4)
• QueueScheduler: rename ImmediateScheduler to QueueScheduler (66eb537)
• Rx.Symbol.rxSubscriber: add rxSubscriber symbol (d4f1670)
• Subject: add rxSubscriber symbol (d2e4257)
• Subscriber: add rxSubscriber symbol (7bda360)
• switchFirstMap: rename switchMapFirst to switchFirstMap (eddd4dc)

BREAKING CHANGES

• AsapScheduler: Rx.Scheduler.nextTick (Rx 4's "default" scheduler) is now Rx.Scheduler.asap
• QueueScheduler: Rx.Scheduler.immediate (Rx 4's "currentThread" scheduler) is now Rx.Scheduler.queue related #838
• switchFirstMap: switchMapFirst is now switchFirstMap

5.0.0-alpha.12 (2015-12-04)

Bug Fixes

• AsyncSubject: emit value when it's subscribed after complete (ed0eaf6)
• bindCallback: only call function once even while scheduled (8637d47), closes #881
• bufferToggle: fix disposal of subscriptions when errors occur (a20325c)
• catch: fix catch to dispose old subscriptions (280f7ed), closes #763
• catch: fix catch() to preserve Subscriber chain (e1447ac)
• concat: accept scheduler parameter (8859702)
• ConnectableObservable: fix ConnectableObservable connectability and refCounting (aef9578), closes #678
• debounce: Fix debounce to unsubscribe duration Observables (dea7847)
• expand: fix expand's concurrency behavior (01f86e5)
• expand: terminate recursive call when destination completes (3b8cf94)
• Observable: Subjects no longer wrapped in Subscriber (5cb0f2b), closes #825 #748
• Observer: anonymous observers now allow missing handlers (a11c763), closes #723
• operators: Remove shareReplay and shareBehavior (536a6a6), closes #710
• publish: copy readme and license, remove scripts (439a2f3), closes #845
• throttleTime: fix and rename throttleTime operator (3b0c1f3)
• TimerObservable: accepts absolute date for dueTime (e284fb8), closes #648

Features

• AsyncSubject: add AsyncSubject (34c05fe)
• bindCallback: remove thisArg (feea9a1)
• bindCallback: rename fromCallback to bindCallback (305d66d), closes #876
• callback: Add Observable.fromCallback (9f751e7)
• combineLatest: accept array of observable as parameter (2edd92c), closes #594
• forkJoin: accept array of observable as parameter (d45f672)
• mergeScan: support concurrency parameter for mergeScan (fe0eb37), closes #868
• usage: add auto-patching operators (1ab3508), closes #860
• skipWhile: add skipWhile operator (a2244e0)
• switchFirst: add switchFirst and switchMapFirst (71e3dd1)
• publishLast: add publishLast operator (9bef228), closes #883
• takeWhile: add takeWhile operator (48e53ea), closes #695
• takeWhile: remove thisArg (b5219a4)
• throttle: add throttle operator with durationSelector (c3bf3e7), closes #496

Performance Improvements

• ReplaySubject: fix memory leak of growing buffer (0a73b4d), closes #578

5.0.0-alpha.11 (2015-12-01)

Bug Fixes

• catch: fix catch to dispose old subscriptions (280f7ed), closes #763
• concat: accept scheduler parameter (8859702)
• ConnectableObservable: fix ConnectableObservable connectability and refCounting (aef9578), closes #678
• debounce: Fix debounce to unsubscribe duration Observables (dea7847)
• expand: fix expand's concurrency behavior (01f86e5)
• expand: terminate recursive call when destination completes (3b8cf94)
• Observer: anonymous observers now allow missing handlers (a11c763), closes #723
• operators: Remove shareReplay and shareBehavior (536a6a6), closes #710
• test: make explicit unsubscription for observable (505f5b7)
• throttleTime: fix and rename throttleTime operator (3b0c1f3)
• TimerObservable: accepts absolute date for dueTime (e284fb8), closes #648

Features

• callback: Add Observable.fromCallback (9f751e7)
• combineLatest: accept array of observable as parameter (2edd92c), closes #594
• forkJoin: accept array of observable as parameter (d45f672)
• operator: add skipWhile operator (a2244e0)
• operator: add switchFirst and switchMapFirst (71e3dd1)
• takeWhile: add takeWhile operator (48e53ea), closes #695
• throttle: add throttle operator with durationSelector (c3bf3e7), closes #496

Performance Improvements

• ReplaySubject: fix memory leak of growing buffer (0a73b4d), closes #578

5.0.0-alpha.10 (2015-11-10)

Bug Fixes

• Immediate: set immediate should no longer throw in Chrome (a3de7d9), closes #690

5.0.0-alpha.9 (2015-11-10)

Bug Fixes

• util: incorrect Symbol.iterator for es6-shim (15bf32c)

Features

• forkJoin: accept promise, resultselector as parameter of forkJoin (190f349), closes #507

5.0.0-alpha.8 (2015-11-06)

Bug Fixes

• concat: handle a given scheduler correctly (8745216)
• package.json: loosen the engines/npm semver range to prevent false warnings (df791c6)
• skipUntil: unsubscribe source when it completes (8a4162b), closes #577
• take: deal with total <= 0 and add tests (c5cc06f)
• windowWhen: fix windowWhen with regard to unsubscriptions (8174947)

Features

• mergeScan: add new mergeScan operator. (0ebb5bd)
• multicast: support both Subject and subjectFactory arguments (f779027)

BREAKING CHANGES

• publish: reverted to RxJS 4 behavior
• publishBehavior: reverted to RxJS 4 behavior
• publishReplay: reverted to RxJS 4 behavior
• shareBehavior: removed
• shareReplay: removed

5.0.0-alpha.7 (2015-10-27)

Bug Fixes

• NextTickAction: fix unsubscription behavior (3d8264c), closes #582
• buffer: cleanup notifier subscription when unsubscribed (1b30aa9)
• delay: accepts absolute time delay (b109100)
• mergeMapTo: mergeMapTo result should complete (6f9859e)
• operator: update type definitions for union types (9d90c75), closes #581
• repeat: fix inner subscription semantics for repeat (f67a596), closes #554
• switchMapTo: reimplement switchMapTo to pass tests (d4789cd)
• takeUntil: unsubscribe notifier when it completes (9415196)

Features

• operator: add max operator (7fda036)
• operator: add min operator (79cb6cf)
• shareBehavior: add shareBehavior and its tests (97ff1ec)

5.0.0-alpha.6 (2015-10-17)

Bug Fixes

• retryWhen: fix internal unsubscriptions (5aff5e8)
• scan: scan now behaves like RxJS 4 scan (27f9c09)

5.0.0-alpha.5 (2015-10-16)

Bug Fixes

• bufferToggle: fix bugs in order to pass tests (949fa31)
• mergeAll: fix mergeAll micro performance tests to use mapTo instead of map. (616e86e)
• package: correct typings path (a501b06)
• repeat: add additional resubscription behavior (4f9f33b), closes #516
• retry: fix internal unsubscriptions for retry (cc92f45), closes #546
• windowToggle: fix window closing and unsubscription semantics (0cb21e6)

5.0.0-alpha.4 (2015-10-15)

Bug Fixes

• Subject: fix missing unsubscribe call (9dd27d6)
• Subscriber: avoid implicit any (08faaa9)
• bufferWhen: onComplete of closings determine buffers (5d28a38)
• fromEvent: make selector argument optional in fromEvent static method (71d90b4)
• skipUntil: update skipUntil behavior with error, completion (6f0d98f), closes #518
• windowCount: fix windowCount window opening times (908ae56), closes #273

Features

• operator: add debounce operator (a1e652f), closes #493
• operator: add debounceTime operator (dd2ba40)

Performance Improvements

• ScalarObservable: add fast-path for mapping scalar observables (7b0d3dc)
• count: fast-path for counting over scalars (c35a120)
• filter: add fast-path for filtering scalar observables (e2e8954)
• reduce: add fast-path for reducing over scalar observables (4c65136)
• scan: fast-path for scanning scalars (0201b92)
• skip: fast-path for skip over scalar observable (9b49936)
• take: add fast-path for take over scalars (33053b1)

5.0.0-alpha.3 (2015-10-13)

Bug Fixes

• Observable: fix type signature of some static operators (e5364de)
• Subject.create: ensure operator property not required for Observable subscription (2259de2), closes #483
• TestScheduler: stop sorting actual results (51db0b8), closes #422
• benchpress: update benchpress dependencies and config (8513eaa), closes #348
• buffer: change behavior of buffer to more closely match RxJS 4 (b66592d)
• combineLatest: fix type signature (a3e6deb)
• defer: fix type signature (11327b9)
• empty: fix type signature (893cb7e)
• fromPromise: fix type signature (17415fa)
• groupBy: durationSelector cannot keep source alive (57e4207)
• groupBy: fix bugs related to group resets (23a7574)
• groupBy: fix bugs with groupBy (86992c6)
• interval: fix signature type (9c238c0)
• operator: startWith operator accepts scheduler, multiple values (d1d339a)
• operators: reorder signature of resultSelectors (fc1724d)
• range: fix type signature (9237d0b)
• timeout: fix absolute timeout behavior (8ec06cf)
• timeout: update behavior of timeout, timeoutWith (16bd691)
• timer: fix type signature (fffb96c)
• window: handle closingNotifier errors/completes (42beff1)

Features

• TestScheduler: support unsubscription marbles (ffb0bb9)
• count: add predicate support in count() (42d1add), closes #425
• dematerialize: add dematerialize operator (0a8b074), closes #475
• do: do will now handle an observer as an argument (c1a4994), closes #476
• first: add resultSelector (3c20fcc), closes #417
• last: add resultSelector argument (5a4896c), closes #418
• operator: add every operator (d11f32e)
• operator: add timeInterval operator (6cc0615)
• share: add the share operator (c36f2be), closes #439
• shareReplay: add the shareReplay() operator (65c84ea)

Performance Improvements

• ReplaySubject: remove unnecessary computation (488ac2e)

BREAKING CHANGES

• operators with resultSelectors (mergeMap, concatMap, switchMap, etc): The function signature of resultSelectors used to be (innerValue, outerValue, innerIndex, outerIndex) but this commits changes it to be (outerValue, innerValue, outerIndex, innerIndex), to match signatures in RxJS 4.

5.0.0-alpha.2 (2015-09-30)

Bug Fixes

• concat: let observable concat instead of merge (c17e832)

Features

• operator: add find, findIndex operator (7c6cc9d)
• operator: add first operator (274c233)
• operator: add ignoreElements operator (fe1a952)
• zip: zip now supports never-ending iterables (a5684ba), closes #397

5.0.0-alpha.1 (2015-09-23)

Bug Fixes

• Promises: escape promise error trap (c69088a)
• TestScheduler: ensure TestScheduler subscribes to expectations before hot subjects (b9b2ba5)
• TestScheduler: properly schedule actions added dynamically (069ede4)
• buffer: do not emit empty buffer when completes (252fccb)
• bufferTime: inner intervals will now clean up properly (4ef41b0)
• expand: Fix expand to stay open until the source Observable completes. (20ef785)
• expand: fix expand operator to match Rx3 (67f9623)
• last: emit value matches with predicate instead of result of predicate (0f635ee)
• merge: fix issues with async in merge (7a15304)
• mergeAll: merge all will properly handle async observables (43b63cc)
• package: specify supported npm version (f72e622)
• switchAll: switch all will properly handle async observables (c2e2d29)
• switchAll/switchLatest: inner subscriptions should now properly unsub (38a45f8), closes #302

Features

• combineLatest: supports promises, iterables, lowercase-o observables and Observables (ce76e4e)
• config: add global configuration of Promise capability (e7eb5d7), closes #115
• expand: now handles promises, iterables and lowercase-o observables (c5239e9)
• mergeAll: now supports promises, iterables and lowercase-o observables (4c16aa6)
• operator: add elementAt operator (cd562c4)
• operator: add isEmpty operator (80f72c5)
• operator: add last operator (d841b11), closes #304 #306
• operator: add single operator (49484a2)
• switch: add promise, iterable and array support (24fdd34)
• withLatestFrom: default array output, handle other types (cb393dc)
• zip: supports promises, iterables and lowercase-o observables (d332a0e)

0.0.0-prealpha.3 (2015-09-11)

Bug Fixes

• root: use self as the root object when available (0428a85)

0.0.0-prealpha.2 (2015-09-11)

Bug Fixes

• bufferCount: set default value for skip argument, do not emit empty buffer at the end (2c1a9dc)
• windowCount: set default value for skip argument, do not emit empty buffer at the end (a513dbb)

Features

• Observable: add static create method (e0d27ba), closes #255
• TestScheduler: add TestScheduler (b23daf1), closes #270
• VirtualTimeScheduler: add VirtualTimeScheduler (96f9386), closes #269
• operator: add sample and sampleTime (9e62789), closes #178

0.0.0-prealpha.1 (2015-09-02)

Bug Fixes

• combineLatest: check for limits higher than total observable count (81e5dfb)
• rx: add hack to export global until better global build exists (1a543b0)
• subscription-ref: add setter for isDisposed (6fe5427)
• take: complete on limit reached (801a711)

Features

• benchpress: add benchpress config and flatmap spec (0441dea)
• catch: add catch operator, related to #141, closes #130 (94b4c01), closes #130
• from: let from handle any "observablesque" (526d4c3), closes #156 #236
• index: add index module which requires commonjs build (379d2d1), closes #117
• observable: add Observable.all (forkJoin) (44a4ee1)
• operator: Add count operator. (30dd894)
• operator: Add distinctUntilChanged and distinctUntilKeyChanged (f9ba4da)
• operator: Add do operator. (7d9b52b)
• operator: Add expand operator. (47b178b)
• operator: Add minimal delay operator. (7851885)
• operator: add buffer operators: buffer, bufferWhen, bufferTime, bufferCount, and bufferTog (9f8347f), closes #207
• operator: add debounce (f03adaf), closes #193
• operator: add defaultIfEmpty (c80688b)
• operator: add finally (526e4c9)
• operator: add fromEventPattern creator function (1095d4c)
• operator: add groupBy (1e13aea), closes #165
• operator: add materialize. closes #132 (6d9f6ae), closes #132
• operator: add publishBehavior operator and spec (249ab8d)
• operator: add publishReplay operator and spec (a0c47d6)
• operator: add retry (4451db5)
• operator: add retryWhen operator. closes #129 (65eb50e), closes #129
• operator: add skipUntil (ef2620e), closes #180
• operator: add throttle (1d735b9), closes #191
• operator: add timeout and timeoutWith (bb440ad), closes #244
• operator: add toPromise operator. closes #159 (361a53b), closes #159
• operator: add window operators: window, windowWhen, windowTime, windowCount, windowToggle (9f5d510), closes #195
• operator: add withLatestFrom (322218a), closes #209
• operator: implement startWith(). (1f36d99)