# @fluidframework/merge-tree

## 2.40.0

Dependency updates only.

## 2.33.0

Dependency updates only.

## 2.32.0

Dependency updates only.

## 2.31.0

Dependency updates only.

## 2.30.0

Dependency updates only.

## 2.23.0

Dependency updates only.

## 2.22.0

Dependency updates only.

## 2.21.0

Dependency updates only.

## 2.20.0

### Minor Changes

- Previously deprecated Merge-Tree and SharedString ISegment members have been removed ([#23448](https://github.com/microsoft/FluidFramework/pull/23448)) [e98574fc62](https://github.com/microsoft/FluidFramework/commit/e98574fc625bea7ebce6d79284f32556aaec1c50)

  The current `ISegment` interface over-exposes a number of properties which do not have an external use case, and any external usage could result in damage to the underlying merge-tree including data corruption.
  [In Fluid Framework release 2.12.0 these properties and associated types were deprecated.](https://github.com/microsoft/FluidFramework/releases/tag/client_v2.12.0#user-content-merge-tree-and-sharedstring-isegment-deprecations-23323)

  The only use case that will continue to be supported is determining if a segment is removed. For this purpose we've added the free function `segmentIsRemoved(segment: ISegment): boolean`.

  For example, checking if a segment is not removed would change as follows:

  ```diff
  - if(segment.removedSeq === undefined){
  + if(!segmentIsRemoved(segment)){
  ```

  The following properties are removed from `ISegment` and its implementations:

  - clientId
  - index
  - localMovedSeq
  - localRefs
  - localRemovedSeq
  - localSeq
  - movedClientsIds
  - movedSeq
  - movedSeqs
  - ordinal
  - removedClientIds
  - removedSeq
  - seq
  - wasMovedOnInsert

  Additionally, the following types are also removed:

  - IMergeNodeCommon
  - IMoveInfo
  - IRemovalInfo
  - LocalReferenceCollection

## 2.13.0

Dependency updates only.

## 2.12.0

### Minor Changes

- Merge-Tree and SharedString ISegment Deprecations ([#23323](https://github.com/microsoft/FluidFramework/pull/23323)) [e8762e37cd](https://github.com/microsoft/FluidFramework/commit/e8762e37cd5edbad36b78b5a40d62a730522e18f)

  The current ISegment interface over-exposes a number of properties which do not have an external use case, and any external usage could result in damage to the underlying merge-tree including data corruption.

  The only use case that will continue to be supported is determining if a segment is removed. For this purpose we've added the free function `segmentIsRemoved(segment: ISegment): boolean`.

  For example, checking if a segment is not removed would change as follows:

  ```diff
  - if(segment.removedSeq === undefined){
  + if(!segmentIsRemoved(segment)){
  ```

  The following properties are deprecated on ISegment and its implementations:

  - clientId
  - index
  - localMovedSeq
  - localRefs
  - localRemovedSeq
  - localSeq
  - movedClientsIds
  - movedSeq
  - movedSeqs
  - ordinal
  - removedClientIds
  - removedSeq
  - seq
  - wasMovedOnInsert

  Additionally, the following types are also deprecated, and will become internal (i.e. users of the Fluid Framework will not have access to them):

  - IMergeNodeCommon
  - IMoveInfo
  - IRemovalInfo
  - LocalReferenceCollection

## 2.11.0

Dependency updates only.

## 2.10.0

### Minor Changes

- Unsupported merge-tree types and related exposed internals have been removed ([#22696](https://github.com/microsoft/FluidFramework/pull/22696)) [7a032533a6](https://github.com/microsoft/FluidFramework/commit/7a032533a6ee6a6f76fe154ef65dfa33f87e5a7b)

  As part of ongoing improvements, several internal types and related APIs have been removed. These types are unnecessary for any supported scenarios and could lead to errors if used. Since directly using these types would likely result in errors, these changes are not likely to impact any Fluid Framework consumers.

  Removed types:

  - IMergeTreeTextHelper
  - MergeNode
  - ObliterateInfo
  - PropertiesManager
  - PropertiesRollback
  - SegmentGroup
  - SegmentGroupCollection

  In addition to removing the above types, they are no longer exposed through the following interfaces and their implementations: `ISegment`, `ReferencePosition`, and `ISerializableInterval`.

  Removed functions:

  - addProperties
  - ack

  Removed properties:

  - propertyManager
  - segmentGroups

  The initial deprecations of the now changed or removed types were announced in Fluid Framework v2.2.0:
  [Fluid Framework v2.2.0](https://github.com/microsoft/FluidFramework/blob/main/RELEASE_NOTES/2.2.0.md)

- SharedString DDS annotateAdjustRange ([#22751](https://github.com/microsoft/FluidFramework/pull/22751)) [d54b9dde14](https://github.com/microsoft/FluidFramework/commit/d54b9dde14e9e0e5eb7999db8ebf6da98fdfb526)

  This update introduces a new feature to the `SharedString` DDS, allowing for the adjustment of properties over a specified range. The `annotateAdjustRange` method enables users to apply adjustments to properties within a given range, providing more flexibility and control over property modifications.

  An adjustment is a modification applied to a property value within a specified range. Adjustments can be used to increment or decrement property values dynamically. They are particularly useful in scenarios where property values need to be updated based on user interactions or other events. For example, in a rich text editor, adjustments can be used for modifying indentation levels or font sizes, where multiple users could apply differing numerical adjustments.

  ### Key Features and Use Cases:

  - **Adjustments with Constraints**: Adjustments can include optional minimum and maximum constraints to ensure the final value falls within specified bounds. This is particularly useful for maintaining consistent formatting in rich text editors.
  - **Consistent Property Changes**: The feature ensures that property changes are consistent, managing both local and remote changes effectively. This is essential for collaborative rich text editing where multiple users may be making adjustments simultaneously.
  - **Rich Text Formatting**: Adjustments can be used to modify text properties such as font size, indentation, or other formatting attributes dynamically based on user actions.

  ### Configuration and Compatibility Requirements:

  This feature is only available when the configuration `Fluid.Sequence.mergeTreeEnableAnnotateAdjust` is set to `true`. Additionally, all collaborating clients must have this feature enabled to use it. If any client does not have this feature enabled, it will lead to the client exiting collaboration. A future major version of Fluid will enable this feature by default.

  ### Usage Example:

  ```typescript
  sharedString.annotateAdjustRange(start, end, {
    key: { value: 5, min: 0, max: 10 },
  });
  ```

- MergeTree `Client` Legacy API Removed ([#22697](https://github.com/microsoft/FluidFramework/pull/22697)) [2aa0b5e794](https://github.com/microsoft/FluidFramework/commit/2aa0b5e7941efe52386782595f96ff847c786fc3)

  The `Client` class in the merge-tree package has been removed. Types that directly or indirectly expose the merge-tree `Client` class have also been removed.

  The removed types were not meant to be used directly, and direct usage was not supported:

  - AttributionPolicy
  - IClientEvents
  - IMergeTreeAttributionOptions
  - SharedSegmentSequence
  - SharedStringClass

  Some classes that referenced the `Client` class have been transitioned to interfaces. Direct instantiation of these classes was not supported or necessary for any supported scenario, so the change to an interface should not impact usage. This applies to the following types:

  - SequenceInterval
  - SequenceEvent
  - SequenceDeltaEvent
  - SequenceMaintenanceEvent

  The initial deprecations of the now changed or removed types were announced in Fluid Framework v2.4.0:
  [Several MergeTree Client Legacy APIs are now deprecated](https://github.com/microsoft/FluidFramework/blob/main/RELEASE_NOTES/2.4.0.md#several-mergetree-client-legacy-apis-are-now-deprecated-22629)

## 2.5.0

### Minor Changes

- Compilation no longer fails when building with TypeScript's libCheck option ([#22923](https://github.com/microsoft/FluidFramework/pull/22923)) [a1b4cdd45e](https://github.com/microsoft/FluidFramework/commit/a1b4cdd45ee9812e2598ab8d2854333d26a06eb4)

  When compiling code using Fluid Framework with TypeScript's `libCheck` (meaning without [skipLibCheck](https://www.typescriptlang.org/tsconfig/#skipLibCheck)), two compile errors can be encountered:

  ```
  > tsc

  node_modules/@fluidframework/merge-tree/lib/client.d.ts:124:18 - error TS2368: Type parameter name cannot be 'undefined'.

  124     walkSegments<undefined>(handler: ISegmentAction<undefined>, start?: number, end?: number, accum?: undefined, splitRange?: boolean): void;
                       ~~~~~~~~~

  node_modules/@fluidframework/tree/lib/util/utils.d.ts:5:29 - error TS7016: Could not find a declaration file for module '@ungap/structured-clone'. 'node_modules/@ungap/structured-clone/esm/index.js' implicitly has an 'any' type.
    Try `npm i --save-dev @types/ungap__structured-clone` if it exists or add a new declaration (.d.ts) file containing `declare module '@ungap/structured-clone';`

  5 import structuredClone from "@ungap/structured-clone";
                                ~~~~~~~~~~~~~~~~~~~~~~~~~
  ```

  The first error impacts projects using TypeScript 5.5 or greater and either of the `fluid-framework` or `@fluidframework/merge-tree` packages.
  The second error impacts projects using the `noImplicitAny` tsconfig setting and the `fluid-framework` or `@fluidframework/tree` packages.

  Both errors have been fixed.

  This should allow `libCheck` to be reenabled in any impacted projects.

## 2.4.0

### Minor Changes

- Several MergeTree `Client` Legacy APIs are now deprecated ([#22629](https://github.com/microsoft/FluidFramework/pull/22629)) [0b59ae89e0](https://github.com/microsoft/FluidFramework/commit/0b59ae89e0aefefad0ccef198adf99929bc4d783)

  To reduce exposure of the `Client` class in the merge-tree package, several types have been deprecated. These types directly or indirectly expose the merge-tree `Client` class.

  Most of these types are not meant to be used directly, and direct use is not supported:

  - AttributionPolicy
  - IClientEvents
  - IMergeTreeAttributionOptions
  - SharedSegmentSequence
  - SharedStringClass

  Some of the deprecations are class constructors. In those cases, we plan to replace the class with an interface which has an equivalent API. Direct instantiation of these classes is not currently supported or necessary for any supported scenario, so the change to an interface should not impact usage. This applies to the following types:

  - SequenceInterval
  - SequenceEvent
  - SequenceDeltaEvent
  - SequenceMaintenanceEvent

## 2.3.0

Dependency updates only.

## 2.2.0

### Minor Changes

- The PropertyManager class and related functions and properties are deprecated ([#22183](https://github.com/microsoft/FluidFramework/pull/22183)) [cbba69554f](https://github.com/microsoft/FluidFramework/commit/cbba69554fc5026f562f44683a902474fabd6e81)

  The `PropertyManager` class, along with the `propertyManager` properties and `addProperties` functions on segments and intervals, are not intended for external use.
  These elements will be removed in a future release for the following reasons:

  - There are no scenarios where they need to be used directly.
  - Using them directly will cause eventual consistency problems.
  - Upcoming features will require modifications to these mechanisms.

- Deprecate segmentGroups and ack on ISegment ([#22212](https://github.com/microsoft/FluidFramework/pull/22212)) [2b0199dae3](https://github.com/microsoft/FluidFramework/commit/2b0199dae3d73cc7d4fab0f4848614b42e212220)

  The `SegmentGroupCollection` class, along with the `segmentGroups` property and `ack` function on segments, are not intended for external use.
  These elements will be removed in a future release for the following reasons:

  - There are no scenarios where they need to be used directly.
  - Using them directly will cause eventual consistency problems.
  - Upcoming features will require modifications to these mechanisms.

## 2.1.0

### Minor Changes

- The Marker.fromJSONObject and TextSegment.fromJSONObject argument types have been corrected ([#21684](https://github.com/microsoft/FluidFramework/pull/21684)) [d2d472bd88](https://github.com/microsoft/FluidFramework/commit/d2d472bd88d8360bb77303079eebef16d5a69131)

  Previously, the arguments of `Marker.fromJSONObject` and `TextSegment.fromJSONObject` were of type `any`. However, at
  runtime only certain types were expected and using other types would cause errors.

  Now, the argument for the Marker implementation is of type `IJSONSegment` and the argument for the TextSegment
  implementation is of type `string | IJSONSegment`. This reflects actual runtime support.

  This change should have no impact on existing code unless the code is using incorrect types. Such code already does not
  function and should be corrected.

## 2.0.0-rc.5.0.0

### Minor Changes

- Update to TypeScript 5.4 ([#21214](https://github.com/microsoft/FluidFramework/pull/21214)) [0e6256c722](https://github.com/microsoft/FluidFramework/commit/0e6256c722d8bf024f4325bf02547daeeb18bfa6)

  Update package implementations to use TypeScript 5.4.5.

## 2.0.0-rc.4.0.0

Dependency updates only.

## 2.0.0-rc.3.0.0

### Major Changes

- Packages now use package.json "exports" and require modern module resolution [97d68aa06b](https://github.com/microsoft/FluidFramework/commit/97d68aa06bd5c022ecb026655814aea222a062ae)

  Fluid Framework packages have been updated to use the [package.json "exports"
  field](https://nodejs.org/docs/latest-v18.x/api/packages.html#exports) to define explicit entry points for both
  TypeScript types and implementation code.

  This means that using Fluid Framework packages require the following TypeScript settings in tsconfig.json:

  - `"moduleResolution": "Node16"` with `"module": "Node16"`
  - `"moduleResolution": "Bundler"` with `"module": "ESNext"`

  We recommend using Node16/Node16 unless absolutely necessary. That will produce transpiled JavaScript that is suitable
  for use with modern versions of Node.js _and_ Bundlers.
  [See the TypeScript documentation](https://www.typescriptlang.org/tsconfig#moduleResolution) for more information
  regarding the module and moduleResolution options.

  **Node10 moduleResolution is not supported; it does not support Fluid Framework's API structuring pattern that is used
  to distinguish stable APIs from those that are in development.**

## 2.0.0-rc.2.0.0

Dependency updates only.

## 2.0.0-rc.1.0.0

### Minor Changes

- Updated server dependencies ([#19122](https://github.com/microsoft/FluidFramework/issues/19122)) [25366b4229](https://github.com/microsoft/FluidFramework/commits/25366b422918cb43685c5f328b50450749592902)

  The following Fluid server dependencies have been updated to the latest version, 3.0.0. [See the full changelog.](https://github.com/microsoft/FluidFramework/releases/tag/server_v3.0.0)

  - @fluidframework/gitresources
  - @fluidframework/server-kafka-orderer
  - @fluidframework/server-lambdas
  - @fluidframework/server-lambdas-driver
  - @fluidframework/server-local-server
  - @fluidframework/server-memory-orderer
  - @fluidframework/protocol-base
  - @fluidframework/server-routerlicious
  - @fluidframework/server-routerlicious-base
  - @fluidframework/server-services
  - @fluidframework/server-services-client
  - @fluidframework/server-services-core
  - @fluidframework/server-services-ordering-kafkanode
  - @fluidframework/server-services-ordering-rdkafka
  - @fluidframework/server-services-ordering-zookeeper
  - @fluidframework/server-services-shared
  - @fluidframework/server-services-telemetry
  - @fluidframework/server-services-utils
  - @fluidframework/server-test-utils
  - tinylicious

- Updated @fluidframework/protocol-definitions ([#19122](https://github.com/microsoft/FluidFramework/issues/19122)) [25366b4229](https://github.com/microsoft/FluidFramework/commits/25366b422918cb43685c5f328b50450749592902)

  The @fluidframework/protocol-definitions dependency has been upgraded to v3.1.0. [See the full
  changelog.](https://github.com/microsoft/FluidFramework/blob/main/common/lib/protocol-definitions/CHANGELOG.md#310)

- sequence: Remove the findTile API ([#18908](https://github.com/microsoft/FluidFramework/issues/18908)) [29b093e55c](https://github.com/microsoft/FluidFramework/commits/29b093e55cb2a7e98c9445b735783f463acfb3bb)

  The `findTile` API that was previously deprecated is now being removed. The new `searchForMarker` function provides similar functionality, and can be called with the start position, the client ID, the desired marker label to find, and the search direction, where a value of `true` indicates a forward search.

## 2.0.0-internal.8.0.0

### Major Changes

- sequence: Some function return types are now void instead of any [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  The return types of some functions have changed from `any` to `void` because the projects are now being compiled with
  the `noImplicitAny` TypeScript compilation option. This does not represent a logic change and only serves to make the
  typing of these functions more accurate.

- sequence: Add experimental support for the obliterate operation [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  This change adds experimental support for _obliterate_, a form of _remove_ that deletes concurrently inserted segments.
  To use, enable the `mergeTreeEnableObliterate` feature flag and call the new `obliterateRange` functions.

  Note: this change may cause compilation errors for those attaching event listeners. As long as obliterate isn't used in
  current handlers, their current implementation is sound.

- sequence: Removed Marker.hasSimpleType and made sequence operations return void [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  `Marker.hasSimpleType` was unused. Sequence operations now no longer return IMergeTree\*Msg types.
  These types are redundant with the input.

- sequence: Removed several public exports from merge-tree and sequence [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  The following APIs have been removed or marked internal in merge-tree and sequence. This functionality was never
  intended for public export.

  - `BaseSegment.ack`
  - `Client`
  - `CollaborationWindow`
  - `compareNumbers`
  - `compareStrings`
  - `createAnnotateMarkerOp`
  - `createAnnotateRangeOp`
  - `createGroupOp`
  - `createInsertOp`
  - `createInsertSegmentOp`
  - `createRemoveRangeOp`
  - `IConsensusInfo`
  - `IConsensusValue`
  - `IMarkerModifiedAction`
  - `IMergeTreeTextHelper`
  - `LocalClientId`
  - `MergeTreeDeltaCallback`
  - `MergeTreeMaintenanceCallback`
  - `NonCollabClient`
  - `SegmentAccumulator`
  - `SegmentGroup`
  - `SegmentGroupCollection.enqueue`
  - `SegmentGroupCollection.dequeue`
  - `SegmentGroupCollection.pop`
  - `SortedSegmentSet`
  - `SortedSegmentSetItem`
  - `SortedSet`
  - `toRemovalInfo`
  - `TreeMaintenanceSequenceNumber`
  - `UniversalSequenceNumber`
  - `SharedSegmentSequence.submitSequenceMessage`

- merge-tree: Remove `IIntegerRange` [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  This interface is deprecated and was not intended for public export.

- sequence: Remove support for combining ops [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  In sequence, removed the following APIs:

  - the `combiningOp` argument from `SharedSegmentSequence.annotateRange` and `SharedString.annotateMarker`
  - the function `SharedString.annotateMarkerNotifyConsensus`

  In merge-tree, removed the following APIs:

  - `ICombiningOp`
  - the `combiningOp` field from `IMergeTreeAnnotateMsg`
  - the `op` argument from `BaseSegment.addProperties`, `PropertiesManager.addProperties`, and `ReferencePosition.addProperties`
  - the enum variant `PropertiesRollback.Rewrite`.

  This functionality was largely unused and had no test coverage.

- sequence: Removed several APIs [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  The following APIs have been removed:

  - `Client.getStackContext`
  - `SharedSegmentSequence.getStackContext`
  - `IntervalType.Nest`
  - `ReferenceType.NestBegin`
  - `ReferenceType.NestEnd`
  - `internedSpaces`
  - `RangeStackMap`
  - `refGetRangeLabels`
  - `refHasRangeLabel`
  - `refHasRangeLabels`

  This functionality is deprecated, has low test coverage, and is largely unused.

- merge-tree: Remove several APIs [9a451d4946](https://github.com/microsoft/FluidFramework/commits/9a451d4946b5c51a52e4d1ab5bf51e7b285b0d74)

  Removed the following APIs:

  - `Stack`
  - `clone`
  - `combine`
  - `createMap`
  - `extend`
  - `extendIfUndefined`
  - `matchProperties`

  This functionality is deprecated and was not intended for public export.

## 2.0.0-internal.7.4.0

### Minor Changes

- sequence: Deprecated ICombiningOp, PropertiesRollback.Rewrite, and SharedString.annotateMarkerNotifyConsensus ([#18318](https://github.com/microsoft/FluidFramework/issues/18318)) [e67c2cac5f](https://github.com/microsoft/FluidFramework/commits/e67c2cac5f275fc5c875c0bc044bbb72aaf76648)

  The `ICombiningOp` and its usage in various APIs has been deprecated. APIs affected include
  `SharedSegmentSequence.annotateRange` and `SharedString.annotateMarker`. `SharedString.annotateMarkerNotifyConsensus`
  has also been deprecated, because it is related to combining ops. This functionality had no test coverage and was
  largely unused.

## 2.0.0-internal.7.3.0

### Minor Changes

- Deprecate BaseSegment.ack, Client, CollaborationWindow, compareNumbers, compareStrings, createAnnotateMarkerOp, createAnnotateRangeOp, createInsertOp, createInsertSegmentOp, createRemoveRangeOp, IConsensusInfo, IConsensusValue, IMarkerModifiedAction, IMergeTreeTextHelper, ISegment.ack, LocalClientId, MergeTreeDeltaCallback, MergeTreeMaintenanceCallback, NonCollabClient, SegmentAccumulator, SegmentGroup, SegmentGroupCollection.dequeue, SegmentGroupCollection.enqueue, SegmentGroupCollection.pop, SortedSegmentSet, SortedSegmentSetItem, SortedSet, toRemovalInfo, TreeMaintenanceSequenceNumber, UnassignedSequenceNumber, UniversalSequenceNumber ([#17952](https://github.com/microsoft/FluidFramework/issues/17952)) [b762798c48](https://github.com/microsoft/FluidFramework/commits/b762798c48ec581202fb5335e907637b8482edcc)

  This functionality was not intended for export and will be removed in a future release.

## 2.0.0-internal.7.2.0

Dependency updates only.

## 2.0.0-internal.7.1.0

### Minor Changes

- merge-tree: Deprecate Stack, clone, combine, createMap, extend, extendIfUndefined, and matchProperties ([#17650](https://github.com/microsoft/FluidFramework/issues/17650)) [2b12bc7e59](https://github.com/microsoft/FluidFramework/commits/2b12bc7e59f7825a222ad33b7faff17477d0fa66)

  The following classes and functions have been deprecated. They were not intended for public export and will be removed
  in a future release.

  - Stack
  - clone
  - combine
  - createMap
  - extend
  - extendIfUndefined
  - matchProperties

- merge-tree: Deprecate IntervalType.Nest, internedSpaces, RangeStackMap, refGetRangeLabels, refHasRangeLabel, and refHasRangeLabels ([#17555](https://github.com/microsoft/FluidFramework/issues/17555)) [e4c11874ef](https://github.com/microsoft/FluidFramework/commits/e4c11874ef7c62b7cde7c282bc7997519d35fbbc)

  The following classes and functions have been deprecated. The functionality has poor test coverage and is largely
  unused. They will be removed in a future release.

  - IntervalType.Nest
  - internedSpaces
  - RangeStackMap
  - refGetRangeLabels
  - refHasRangeLabel
  - refHasRangeLabels

## 2.0.0-internal.7.0.0

### Major Changes

- sequence: New API for specifying spatial positioning of intervals [871b3493dd](https://github.com/microsoft/FluidFramework/commits/871b3493dd0d7ea3a89be64998ceb6cb9021a04e)

  Previously intervals were specified with only an index. Now the model is a bit more nuanced in that you can specify positions that lie before or after a given index. This makes it more clear how interval endpoints should interact with changes to the sequence. See the docs for SequencePlace for additional context.

- Dependencies on @fluidframework/protocol-definitions package updated to 3.0.0 [871b3493dd](https://github.com/microsoft/FluidFramework/commits/871b3493dd0d7ea3a89be64998ceb6cb9021a04e)

  This included the following changes from the protocol-definitions release:

  - Updating signal interfaces for some planned improvements. The intention is split the interface between signals
    submitted by clients to the server and the resulting signals sent from the server to clients.
    - A new optional type member is available on the ISignalMessage interface and a new ISentSignalMessage interface has
      been added, which will be the typing for signals sent from the client to the server. Both extend a new
      ISignalMessageBase interface that contains common members.
  - The @fluidframework/common-definitions package dependency has been updated to version 1.0.0.

- Server upgrade: dependencies on Fluid server packages updated to 2.0.1 [871b3493dd](https://github.com/microsoft/FluidFramework/commits/871b3493dd0d7ea3a89be64998ceb6cb9021a04e)

  Dependencies on the following Fluid server package have been updated to version 2.0.1:

  - @fluidframework/gitresources: 2.0.1
  - @fluidframework/server-kafka-orderer: 2.0.1
  - @fluidframework/server-lambdas: 2.0.1
  - @fluidframework/server-lambdas-driver: 2.0.1
  - @fluidframework/server-local-server: 2.0.1
  - @fluidframework/server-memory-orderer: 2.0.1
  - @fluidframework/protocol-base: 2.0.1
  - @fluidframework/server-routerlicious: 2.0.1
  - @fluidframework/server-routerlicious-base: 2.0.1
  - @fluidframework/server-services: 2.0.1
  - @fluidframework/server-services-client: 2.0.1
  - @fluidframework/server-services-core: 2.0.1
  - @fluidframework/server-services-ordering-kafkanode: 2.0.1
  - @fluidframework/server-services-ordering-rdkafka: 2.0.1
  - @fluidframework/server-services-ordering-zookeeper: 2.0.1
  - @fluidframework/server-services-shared: 2.0.1
  - @fluidframework/server-services-telemetry: 2.0.1
  - @fluidframework/server-services-utils: 2.0.1
  - @fluidframework/server-test-utils: 2.0.1
  - tinylicious: 2.0.1

- Minimum TypeScript version now 5.1.6 [871b3493dd](https://github.com/microsoft/FluidFramework/commits/871b3493dd0d7ea3a89be64998ceb6cb9021a04e)

  The minimum supported TypeScript version for Fluid 2.0 clients is now 5.1.6.

- sequence: Remove the mergeTreeUseNewLengthCalculations flag [871b3493dd](https://github.com/microsoft/FluidFramework/commits/871b3493dd0d7ea3a89be64998ceb6cb9021a04e)

  The `mergeTreeUseNewLengthCalculations` flag has been removed, because the feature was enabled by default in 2.0.0-internal.6.0.0.

## 2.0.0-internal.6.4.0

Dependency updates only.

## 2.0.0-internal.6.3.0

Dependency updates only.

## 2.0.0-internal.6.2.0

### Minor Changes

- Deprecate getStackContext and associated NestBegin/End ([#16877](https://github.com/microsoft/FluidFramework/issues/16877)) [8e743fe1dd](https://github.com/microsoft/FluidFramework/commits/8e743fe1dde9adb3a1240971987d3abd51ab2fbe)

  Deprecate SharedSegmentSequence.getStackContext and Client.getStackContext (and the enums ReferenceType.NestBegin and NestEnd they use).
  This functionality is unused, poorly tested, and incurs performance overhead.

- Remove use of @fluidframework/common-definitions ([#16638](https://github.com/microsoft/FluidFramework/issues/16638)) [a8c81509c9](https://github.com/microsoft/FluidFramework/commits/a8c81509c9bf09cfb2092ebcf7265205f9eb6dbf)

  The **@fluidframework/common-definitions** package is being deprecated, so the following interfaces and types are now
  imported from the **@fluidframework/core-interfaces** package:

  - interface IDisposable
  - interface IErrorEvent
  - interface IErrorEvent
  - interface IEvent
  - interface IEventProvider
  - interface ILoggingError
  - interface ITaggedTelemetryPropertyType
  - interface ITelemetryBaseEvent
  - interface ITelemetryBaseLogger
  - interface ITelemetryErrorEvent
  - interface ITelemetryGenericEvent
  - interface ITelemetryLogger
  - interface ITelemetryPerformanceEvent
  - interface ITelemetryProperties
  - type ExtendEventProvider
  - type IEventThisPlaceHolder
  - type IEventTransformer
  - type ReplaceIEventThisPlaceHolder
  - type ReplaceIEventThisPlaceHolder
  - type TelemetryEventCategory
  - type TelemetryEventPropertyType

- Deprecation of findTile in favor of searchForMarker, which uses depthFirstNodeWalk to locate the nearest marker. ([#16517](https://github.com/microsoft/FluidFramework/issues/16517)) [e928b1f185](https://github.com/microsoft/FluidFramework/commits/e928b1f185ca32123eff9d4bfc5bce28ba1b95c1)

  findTile has a decent amount of buggy behavior, which leads partners who want to use it to implement workarounds for the odd behavior. searchForMarker is being introduced as a replacement. It performs the same basic functionality of searching for the nearest marker to a given start position in the indicated direction. However, it includes the start position as one of the nodes to search, so markers at the start position will be returned as the nearest marker to that position. Notably, positions 0 and length-1 will be included in the search as well, so searching forwards from position 0 or backwards from position length-1 would allow the entire string to be searched.

## 2.0.0-internal.6.1.0

Dependency updates only.

## 2.0.0-internal.6.0.0

### Major Changes

- Client.getSlideToSegment removed [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  Client.getSlideToSegment was deprecated in 2.0.0-internal.5.3.0 and has been removed. Use getSlideToSegoff function instead.

- Remove ISegment.parent [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  This change removed the parent property on the ISegment interface. The property will still exist, but should not generally be used by outside consumers.

  There are some circumstances where a consumer may wish to know if a segment is still in the underlying tree and were using the parent property to determine that.

  Please change those checks to use the following `"parent" in segment && segment.parent !== undefined`

- merge-tree now has new length calculations by default [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  The merge-tree now enables new length calculations by default and resolves some related performance bugs by making cached segment length
  nullable.

  Hierarchy cached segment length is `undefined` if the length of all child nodes is `undefined`.

- Segments Property Removed from TrackingGroup [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  Tracking groups can contain more than just segments, so the deprecated segments property has been removed. Use the tracked property instead to see all tracked objects.

- Remove unnecessary exports [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  This change removes a number of interfaces in the merge tree package that are not used in the exported apis surface and therefore should not be used.

- Upgraded typescript transpilation target to ES2020 [8abce8cdb4](https://github.com/microsoft/FluidFramework/commits/8abce8cdb4e2832fb6405fb44e393bef03d5648a)

  Upgraded typescript transpilation target to ES2020. This is done in order to decrease the bundle sizes of Fluid Framework packages. This has provided size improvements across the board for ex. Loader, Driver, Runtime etc. Reduced bundle sizes helps to load lesser code in apps and hence also helps to improve the perf.If any app wants to target any older versions of browsers with which this target version is not compatible, then they can use packages like babel to transpile to a older target.

## 2.0.0-internal.5.4.0

Dependency updates only.

## 2.0.0-internal.5.3.0

Dependency updates only.

## 2.0.0-internal.5.2.0

### Minor Changes

- Deprecate unnecessary exports ([#16097](https://github.com/microsoft/FluidFramework/issues/16097)) [9486bec0ea](https://github.com/microsoft/FluidFramework/commits/9486bec0ea2f9f1dd3e40fc3b4c42af6b6a44697)

  This change deprecates a number of interfaces in the merge tree package that are not used in the exported apis surface and therefore should not be used.

- Deprecate ISegment.parent ([#16097](https://github.com/microsoft/FluidFramework/issues/16097)) [9486bec0ea](https://github.com/microsoft/FluidFramework/commits/9486bec0ea2f9f1dd3e40fc3b4c42af6b6a44697)

  This change deprecates the parent property on the ISegment interface. The property will still exist, but should not generally be used by outside consumers.

  There are some circumstances where a consumer may wish to know if a segment is still in the underlying tree and were using the parent property to determine that.

  Please change those checks to use the following `"parent" in segment && segment.parent !== undefined`

## 2.0.0-internal.5.1.0

### Minor Changes

- New APIs for interval querying by range ([#15837](https://github.com/microsoft/FluidFramework/issues/15837)) [2a4242e1b5](https://github.com/microsoft/FluidFramework/commits/2a4242e1b5f15442b13ae413124ec76315a4cc52)

  SharedString now supports querying intervals whose start/end-points fall in a specified range.

## 2.0.0-internal.5.0.0

Dependency updates only.

## 2.0.0-internal.4.4.0

### Minor Changes

- New feature: Revertibles for SharedString and Interval provide undo-redo functionality. This includes all direct interval edits as well as string edits that indirectly affect intervals, wrapping merge-tree revertibles. ([#15778](https://github.com/microsoft/FluidFramework/pull/15778)) [6433cb2937](https://github.com/microsoft/FluidFramework/commits/6433cb2937d9a6bc39ac93b0eca2c073e6d5be52)

## 2.0.0-internal.4.1.0

Dependency updates only.
