• TreeReferenceMap:

  • Replaced _purged field type from DualWeakMap to DualLazyWeakMap.
  • Use global LazyWeakReferenceManagerByType to create DualLazyWeakMap instances for purged entries.

• ExpandoWithFinalizer:

  • Refactored to extend generic WithFinalizer base class.
  • Introduced strongly typed FinalizerValueWrapper abstraction and concrete implementations:
    • SimpleFinalizerWrapper, SimpleFinalizerWrapperDebug
    • ExpandoValueWrapper, ExpandoValueWrapperDebug
  • Added AttachOnlyFinalizer class for write-only finalizer usage.
  • Added debug mode to retain weak references to keys for inspection.
  • Improved finalizer attach/detach logic and wrapper management.

• lazy_weak_reference.dart:

  • Added GenericReference interface for strong/weak reference abstraction.
  • Added LazyWeakReferenceManagerByType singleton managing per-type LazyWeakReferenceManager instances.
  • Added toString and compareTo improvements to LazyWeakReference.
  • Added LazyWeakReferenceManagerByType class for centralized management.
  • Added toString override to LazyWeakReferenceManager.

• weak_map.dart:

  • Refactored internal entry classes to support lazy weak references:
    • Added _EntryLazyRef, _EntryLazyRef1, _EntryLazyRef2, _EntryLazyRefValue.
  • WeakKeyMap: include _autoPurge in isAutoPurgeRequired and centralize auto-purge check.
  • Added LazyWeakKeyMap subclass using lazy weak references for keys.
  • Added DualLazyWeakMap subclass using lazy weak references for keys and values.
  • Added factory constructors WeakKeyMap.configured and DualWeakMap.configured to create lazy weak reference variants.
  • Added removeWhereKey extension method on Map and WeakKeyMap.
  • Updated purge logic to use removeWhereKey.
  • Updated DualWeakMap to optionally use lazy weak references for keys and values.

• resource.dart:

  • Changed ResourceContentCache to use private _onLoadEventStream instead of public onLoad field.
  • Updated ResourceContent to lazily initialize _onLoadEventStream and use it internally.
  • Changed event notification to use _onLoadEventStream?.add instead of onLoad.add.

• LazyWeakReference:

  • Added intrusive doubly-linked list fields _prev and _next for internal queue management.
  • Simplified target and targetIfStrong getters using null-coalescing.

• LazyWeakReferenceManager:

  • Replaced SplayTreeSet with an intrusive doubly-linked aging queue (_head, _tail) for strong references.
  • Added _pushBack and _remove methods for O(1) insertion and removal in the aging queue.
  • Updated _handleNewStrongRef and _handleAccessStrongRef to use the intrusive queue.
  • Updated _handleNewWeakRef and _handleDisposedRef to remove references from the queue using _remove.
  • Refactored _weakenStrongRefs to process references from the queue head and schedule next weakening based on precise delay.
  • Improved queue management to avoid allocations and maintain ordering by last strong access time.

Performance Improvements

• Replaced the internal SplayTreeSet used for aging strong references with an intrusive doubly-linked aging queue.
• Benchmark (300k operations, steady set ≈20k items):

• Impact:

  • ~9× faster than the previous SplayTreeSet implementation
  • ~35% faster than Queue
  • Lower GC pressure and allocation overhead
  • Constant-time weaken cycles with stable latency under high churn

• GitHub Actions workflow (.github/workflows/dart.yml):

  • Updated actions/checkout from v2 to v6.
  • Split test jobs into separate test_vm and test_chrome jobs for VM and Chrome platforms respectively.
  • Updated codecov/codecov-action from v1 to v5.
  • Added dart pub publish --dry-run step to the main build job.

• LazyWeakReference:

  • Implemented Comparable<LazyWeakReference> with a strict total order based on _unixTimeMs and unique id.
  • Added id field as a unique sequence identifier assigned by the manager.
  • Exposed unixTimeMs getter.
  • Removed direct _unixTimeMs updates from strong() method; now managed by LazyWeakReferenceManager.
  • Updated constructors to accept id and defer _unixTimeMs assignment to manager.

• LazyWeakReferenceManager:

  • Added _refIdCount to assign unique ids to references.
  • Changed internal strong reference queue from Queue to SplayTreeSet ordered by LazyWeakReference.compareTo.
  • Updated _handleNewStrongRef and _handleAccessStrongRef to update _unixTimeMs and maintain ordering in _strongRefs.
  • Updated _handleNewWeakRef and _handleDisposedRef to remove references from _strongRefs.
  • Updated _weakenStrongRefs to process references from _strongRefs in order, removing the oldest eligible references first.
  • Improved scheduling logic to debounce weakening with precise timing based on reference age.

• Added LazyWeakReference<T>:

  • Holds a reference that starts strong and automatically degrades to weak after a delay.
  • Provides target, targetIfStrong, isStrong, isWeak, isAlive, isLost, isDisposed properties.
  • Supports promotion to strong via strong() and weakening via weak().
  • Manages lifecycle with a LazyWeakReferenceManager.
  • Implements disposal and elapsed time tracking.

• Added LazyWeakReferenceManager<T>:

  • Controls automatic weakening of strong references after a configurable delay.
  • Supports batching with configurable batch size and interval to avoid blocking.
  • Manages queues of strong references and schedules weakening tasks.
  • Provides strong() and weak() factory methods to create managed references.

• Updated lib/swiss_knife.dart:

  • Exported src/lazy_weak_reference.dart.

• TreeReferenceMap:
  • Rollback: avoid WeakReference issues with WASM on Android/Chrome:
    • Replaced internal _map from WeakKeyMap<K, V> to standard Map<K, V>.
    • Updated all _map method calls from containsKeyNoPurge to standard containsKey.
    • Adjusted put, get, addAll, containsKey, and containsValue methods to work with the new _map type.
    • Removed usage of weak key map features and related purging logic tied to it.

• Added new DualMap<K, V> class in lib/src/dual_map.dart:

  • Bidirectional map maintaining two internal maps for O(1) lookup in both directions.
  • Supports insertion, removal, clear, and lookup by key or value.
  • Implements MapBase<K, V> interface.
  • Methods:
    • put(K key, V value): associates value with key, replacing existing mappings.
    • get(Object? key): returns value for key.
    • getKeyFromValue(V value): returns key for value.
    • putIfAbsent(K key, V Function() ifAbsent): inserts if key absent.
    • putValueIfAbsent(K key, V value): inserts value if key absent, returns bool.
    • remove(Object? key): removes key and reverse mapping.
    • clear(): clears all mappings.
  • Properties:
    • keys, values, entries provide iterable views.

• Updated lib/swiss_knife.dart:

  • Exported new src/dual_map.dart.

• WeakKeyMap:
  • putValueIfAbsent: updated to call _onPutEntry and increment _unpurgedCount when a new entry is inserted.

• TreeReferenceMap:

  • getParentKey: fixed handling of purged entries by using _map.containsKeyNoPurge and nullable _purged.
  • containsKey: changed to use _map.containsKeyNoPurge to avoid purging during lookup.

• New ExpandoWithFinalizer.

• WeakKeyMap and DualWeakMap:

  • Added containsKeyNoPurge and containsValueNoPurge methods to check presence without purging collected entries.
  • Added getNoPurge method to get value without purging.
  • Added putValueIfAbsent method to insert a value only if absent.
  • Improved equality and hashCode implementations in _EntryKey for consistent behavior.
  • Updated containsValue in DualWeakMap to properly check presence with purging logic.

• swiss_knife.dart:

  • Exported ExpandoWithFinalizer from the public API.

• EventStream:

  • Changed _controller field to nullable _controllerObj and lazily initialized it.
  • Changed _stream field to nullable _streamObj and lazily initialized it as a broadcast stream.
  • Updated add and addError methods to check isUsed (based on _streamObj presence) before adding events.
  • Updated close, isClosed, and isPaused to handle nullable _controllerObj.
  • Added isUsed getter to indicate if the stream has been used (initialized).

• New FlatHashMap:

  • Flat, index-based hash map with contiguous storage, free-list reuse, and
    adaptive unsigned chain pointers for reduced memory and improved cache locality.

• pubspec.yaml:

  • Updated dependency_validator version from ^5.0.3 to ^5.0.4.

• Added WeakKeyMap and DualWeakMap classes in weak_map.dart:

  • Implemented weakly-referenced keys map with auto-purge support.
  • Added dual weak map with weakly-referenced keys and values.
  • Added SwappedDualWeakMap view for key-value swapped access.
  • Improved internal entry handling with _EntryRef classes.
  • Added iterable and iterator implementations for weak maps.

• Updated TreeReferenceMap in collections.dart:

  • Replaced internal map with WeakKeyMap for weak key references.
  • Added autoPurgeThreshold field and logic to control auto-purge frequency.
  • Added onPurgedEntries callback for purged entries notification.
  • Changed purged entries storage to use DualWeakMap.
  • Improved purge logic to batch purged entries and notify via callback.
  • Optimized auto-purge to trigger only after threshold of unpurged operations.
  • Added keysReversed getter returning reversed keys list.
  • Improved cache expiration and purged entries revalidation logic.

• Updated EventStream in events.dart:

  • Changed _listenSignatures from non-nullable to nullable Set.
  • Added null checks and lazy initialization for _listenSignatures.
  • Improved singleton subscription management to handle null safely.

• Updated swiss_knife.dart:

  • Exported new weak_map.dart.

• Updated pubspec.yaml:

  • Bumped test dependency to ^1.29.0.
  • Bumped dependency_validator to ^5.0.3.

• TreeReferenceMap:
  • getSubValues: added parameter traverseSubValues.

• TreeReferenceMap:
  • Optimize getSubValuesImpl and _walkTreeImpl to avoid self-recursion and use a stack-based algorithm.

• MimeType:

  • Fix parsing for XML: change result from text/xml to application/xml (oficial).

• test: ^1.26.2

• dependency_validator: ^5.0.2

• collection: ^1.19.1

• coverage: ^1.15.0

• sdk: '>=3.6.0 <4.0.0'

• intl: ^0.20.2

• resource_portable: ^3.1.2

• lints: ^5.1.1

• test: ^1.25.15

• collection: ^1.19.0

• Optimize toFlatListOfStrings.

• Added trimListOfStrings.

• sdk: '>=3.4.0 <4.0.0'

• lints: ^4.0.0

• test: ^1.25.14

• dependency_validator: ^4.1.2

• coverage: ^1.11.1

• MimeType:
• Added isYAML, isFont, isPDF, isDart, isOctetStream,
• Added isZip, isGZip, isBZip2, isXZ, isCompressed.
• Added isTar, isTarGZip, isTarBZip2, isTarXZ, isTarCompressed.

• MimeType:

  • Added applicationOctetStream and bytes.

• test: ^1.25.8

• coverage: ^1.9.0

• sdk: '>=3.3.0 <4.0.0'

• intl: ^0.19.0

• lints: ^3.0.0

• test: ^1.25.2

• dependency_validator: ^3.2.3

• collection: ^1.18.0

• coverage: ^1.7.2

• MimeType: fix charset for text/html type.

• sdk: '>=2.18.0 <4.0.0'

• intl: ^0.18.1

• resource_portable: ^3.1.0

• MimeType:
  • parse: optimize and update recognized types.
  • byExtension: add more extensions.
• Added getCharsetEncoding.

• EventStream:
  • listen: new parameter overwriteSingletonSubscription.
  • cancelSingletonSubscription: now ensures that the previous subscription is removed from internal handler.
• coverage: ^1.6.3

• Code adjustments for lints: ^2.0.1.
• intl: ^0.18.0
• resource_portable: ^3.0.1
• lints: ^2.0.1
• test: ^1.22.1

• DataURLBase64:
  • Added constructor DataURLBase64.from.
  • Improved Null Safety code.
• Fix typo.
• test: ^1.17.12
• dependency_validator: ^3.2.2
• collection: ^1.17.0
• coverage: ^1.6.1

• parseBool:
• Improve possible valid values.

• Migrate to lints:
  • NOTE: some constants were renamed to lowercase camel case.
• Improved GitHub CI.
• Added browser tests.
• lints: ^1.0.1
• coverage: ^1.0.4

• Fixed ResourceContent load with errors.
• Test coverage.
• Added FOSSA Status.

• Added Math.clamp.
• Fixed formatDecimal for scientific notation.

• Added UniqueCaller and parseIntList.
• Null safety migration adjustments.

• Null safety migration adjustments.

• collections: improve Null Safety usage.

• Null safety migration adjustments.

• Null safety migration adjustments.

• Null safety migration adjustments.

• Dart 2.12.0:
  • Sound null safety compatibility.
  • Update CI dart commands.
  • sdk: '>=2.12.0 <3.0.0'
• intl: ^0.17.0
• resource_portable: ^3.0.0
• collection: ^1.15.0
• pedantic: ^1.11.0
• test: ^1.16.5

• Optimize: parseInt, parseDouble and parseNum.
• Fix: listNotMatchesAll and listMatchesAny when leading with lists with null elements.
• Dart 2.12.0+ compliant: dartfmt and dartanalyzer.

• TreeReferenceMap: ensure that root is not null.
• EventStream: Added listenOneShot.

• TreeReferenceMap:
  • fix getParentKey.

• Added TreeReferenceMap: an alternative to Weak References (nonexistent in Dart).

• MimeType.byExtension: Added parameter defaultAsApplication.

• MimeType: Added htmlTag and isAudio.
• Added unquoteString.

• Added ObjectCache.
• Added Dimension.
• Added ContextualResource and ContextualResourceResolver:
  • Resolves a resource based into a context, like screen dimension.
• Added: parseFromInlineProperties and dateFormat_YYYY_MM.
• EventStream:
  • Added eventValidator.
• Math:
  • minMax, maxInList and minInList: added optional comparator parameter.

• MimeType: Added isCharsetUTF16, isText, isXML, isXHTML, isFormURLEncoded, isStringType.
• dateFormat_YY*: added optional parameter delimiter.
• InteractionCompleter: Added field triggerDelayLimit.
• Math:
  • Added collection methods: subtract, multiply and divide.

• Improve API Documentation.

• Added resolveURL, similar to resolveUri.
• Added replaceStringMarks.
• buildStringPattern using replaceStringMarks and now returns empty string for null parameters.
• Added EventStreamDelegator, to point to instances of EventStream not instantiated yet.
• Added ListenerWrapper, to handle StreamSubscription related to a listener and useful to create one shot listeners.

• New AsyncValue: to handle values that comes from Future.
• Added isEncodedJSON, isEncodedJSONList and isEncodedJSONMap: to check if a String is an encoded JSON.
• ADded isDigit, isAlphaNumeric, isDigitString, isAlphaNumericString.
• Added listMatchesAny, isListValuesIdentical, listContainsAll, ensureNotEmptyString, deepCatchesValues.
• MimeType.fileExtension: support for svg, xhtml, mpeg, mp3, ico.
• Changed method signature: getUriRootURL, getUriBaseHostAndPort, resolveUri.

• Added: isEmptyString, isNotEmptyString, isListEntriesAllOfType.
• Added deepCopyMap.
• deepCopy: added parameter copier.
• NNField: Added resolver.
• MimeType: added SVG support.
• InteractionCompleter:
  • interact: Added parameters interactionParameters and ignoreConsecutiveEqualsParameters.
  • Added dispose.
• encodeJSON: Added parameter toEncodable.
• Added: toEncodableJSON.
• parseInt, parseDouble and parseNum now returns default value (def) in case of parsing error.
• isDouble now can parse .00 pattern.
• Fix: dataSizeFormat.

• MimeType: Added new types.
• Added constructor MimeType.byExtension.
• MimeType: Fixed parsing of gif.
• EventStream: Added cancelAllSingletonSubscriptions, cancelSingletonSubscription, getSingletonSubscription.
• Added listenStreamWithInteractionCompleter.
• pedantic: ^1.9.2

• removeUriQueryString: avoid blank fragment in the URL.

• Added isPositiveNumber, isNegativeNumber.
• Added MimeType.APPLICATION_ZIP.
• Added maxInIterable, minInIterable.
• Added deepReplaceValues, deepReplaceListValues, deepReplaceMapValues.
• Added parseComparable, removeEmptyEntries, sortMapEntries, sortMapEntriesByValue, sortMapEntriesByKey.

• Added NNField.
• Added clipNumber.
• parseBool: if value is a num: true = v > 0
• More tests.

• Fix typo.

• MimeType: Added charset.
• Added: parseJSON, isBlankString, isBlankStringInRange, isEqualsSet, isEqualsIterable.
• Added: asTreeOfKeyString, parseMapEntry, groupIterableBy, sumIterable, averageIterable.
• Added: parseJSON, encodeJSON.
• Removed splitRegExp. split now accepts Pattern (String and RegExp).
• Optimized isBlankCodeUnit.

• Added string helpers: isBlankChar, isBlankCodeUnit, hasBlankChar, hasBlankCharInRange.
• IO: catFile, catFileBytes, saveFile, saveFileBytes.
• InteractionCompleter: cancel
• `MimeType``: equals and hashcode.
• Added: isEqualsList, isEqualsMap.

• Added: isInUnixEpochRange
• New event handler: InteractionCompleter.

• dartfmt
• test_coverage: ^0.4.2

• Change isEmptyValue to is isEmptyObject.
• Added isNotEmptyObject.

• Fix MimeType.parse when parameter mimeType is empty and defaultMimeType is null.
• Fix DataURLBase64.asDataURLString
• dartfmt.

• fix buildStringPattern() extraParameters issue.

• Math.mean() returns 0 on empty lists.
• dartfmt.
• Add badges to README.md