A composable, cross-platform MVVM framework for .NET inspired by functional reactive programming. It moves mutable state out of the user interface, keeps each feature's logic in one readable place, and makes applications easier to test. Supports WPF, WinForms, WinUI, .NET MAUI, Avalonia, Uno Platform, Blazor and Android.
This report summarizes scanner evidence for reactiveui/ReactiveUI, a C# project with 8,537 GitHub stars. SynthScan examined 155,450 lines of code across 1624 source files, recording 818 pattern matches distributed across 8 syntactic categories. The legacy adjusted pattern signal is 5.8 (Moderate pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Can maintainers explain intent, assumptions, and trade-offs? 810 finding(s).
Are imports declared and package/API names verified? 8 finding(s).
Are wrappers, guards, and repeated structures necessary? 2 finding(s).
Which changes need focused human review? 818 finding(s).
This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 818 distinct pattern matches across 8 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | .github/workflows/sonarcloud.yml | 21 | testProjects: | | COMMENT |
| LOW | .github/workflows/sonarcloud.yml | 41 | # genuinely measures it. | COMMENT |
| LOW | .github/workflows/sonarcloud.yml | 61 | # uikit-common,mac} each implement IReactiveObject, IReactiveNotifyPropertyChanged<T>, | COMMENT |
| LOW | src/ReactiveUI.Testing/TestSequencer.cs | 21 | COMMENT | |
| LOW | src/ReactiveUI.Testing/IBuilderExtensions.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Testing/SchedulerExtensions.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Testing/SchedulerExtensions.cs | 41 | /// <summary>Provides testing extension members for schedulers.</summary> | COMMENT |
| LOW | src/ReactiveUI.Testing/MessageBusExtensions.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …ReactiveUI.Testing.Reactive/TestSchedulerExtensions.cs | 21 | /// <param name="span">Timespan to convert.</param> | COMMENT |
| LOW | …ReactiveUI.Testing.Reactive/TestSchedulerExtensions.cs | 41 | /// <summary> | COMMENT |
| LOW | src/ReactiveUI.Winforms/ContentControlBindingHook.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Winforms/ViewModelControlHostUnsafe.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …c/ReactiveUI.Winforms/ReactiveUserControlNonGeneric.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Winforms/ViewModelViewHost.Designer.cs | 1 | //------------------------------------------------------------------------------ | COMMENT |
| LOW | src/ReactiveUI.Winforms/ReactiveUserControl.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Winforms/ReactiveUserControl.Designer.cs | 1 | #if REACTIVE_SHIM | COMMENT |
| LOW | …eUI.Winforms/ReactiveUserControlNonGeneric.Designer.cs | 1 | #if REACTIVE_SHIM | COMMENT |
| LOW | src/ReactiveUI.Winforms/RoutedViewHost.Designer.cs | 1 | #if REACTIVE_SHIM | COMMENT |
| LOW | src/ReactiveUI.Winforms/RoutedControlHostUnsafe.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/UnhandledErrorException.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …iveUI.Core/Registration/DependencyResolverRegistrar.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …/ReactiveProperty/SingletonPropertyChangedEventArgs.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …eactiveProperty/SingletonDataErrorsChangedEventArgs.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Internal/StartWithObservable.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Internal/TaskObservable.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ReactiveObject/IExtensionState.cs | 21 | COMMENT | |
| LOW | src/ReactiveUI.Core/ReactiveObject/IReactiveObject.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/CollectionChanged.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/ReactiveChangeSet{T}.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/ChangeSetExtensions.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/ChangeSetExtensions.cs | 41 | { | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/ReactiveChangeReason.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ChangeSets/ReactiveChange.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Routing/NotAWeakReference.cs | 21 | /// <summary> | COMMENT |
| LOW | src/ReactiveUI.Core/ReactiveCommand/IReactiveCommand.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/ReactiveCommand/IReactiveCommand.cs | 21 | /// This observable can be particularly useful for updating UI, such as showing an activity indicator whilst a comma | COMMENT |
| LOW | …re/ReactiveCommand/IReactiveCommand{TParam,TResult}.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …re/ReactiveCommand/IReactiveCommand{TParam,TResult}.cs | 21 | /// <para> | COMMENT |
| LOW | …re/ReactiveCommand/IReactiveCommand{TParam,TResult}.cs | 41 | /// the execution logic. | COMMENT |
| LOW | …re/ReactiveCommand/IReactiveCommand{TParam,TResult}.cs | 61 | /// encapsulated by the command. It is worth restating that the returned observable is lazy. Nothing will | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer.cs | 21 | /// OrderBy or OrderByDescending methods on the builder to get an actual comparer. | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer.cs | 41 | [MethodImpl(MethodImplOptions.AggressiveInlining)] | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer.cs | 61 | /// <typeparam name="TValue">The type of the key returned by the selector function.</typeparam> | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer.cs | 81 | /// <summary>Creates a comparer that orders elements in descending order according to a specified key selector.< | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/IComparerBuilder.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/IComparerBuilder.cs | 21 | /// </param> | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/IComparerBuilder.cs | 41 | IComparer<T> OrderBy<TValue>(Func<T, TValue> selector, IComparer<TValue> comparer); | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/IComparerBuilder.cs | 61 | /// comparer is specified. | COMMENT |
| LOW | …eactiveUI.Core/Comparers/ComparerChainingExtensions.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …eactiveUI.Core/Comparers/ComparerChainingExtensions.cs | 21 | /// Creates a derived comparer based on the given parent comparer. The returned comparer will sort elements | COMMENT |
| LOW | …eactiveUI.Core/Comparers/ComparerChainingExtensions.cs | 41 | /// </summary> | COMMENT |
| LOW | …eactiveUI.Core/Comparers/ComparerChainingExtensions.cs | 61 | /// </summary> | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer{T}.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer{T}.cs | 21 | /// </param> | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer{T}.cs | 41 | [MethodImpl(MethodImplOptions.AggressiveInlining)] | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/OrderedComparer{T}.cs | 61 | /// return type of the selector if no comparer is specified. | COMMENT |
| LOW | src/ReactiveUI.Core/Comparers/ChainedComparer.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …UI.Core/Interfaces/ReactivePropertyChangedEventArgs.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| LOW | …I.Core/Interfaces/IReactivePropertyChangedEventArgs.cs | 1 | // Copyright (c) 2009-2026 .NET Foundation and Contributors. All rights reserved. | COMMENT |
| 740 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| CRITICAL | …ive/PublicAPI/net8.0-windows10.0.19041.0/PublicAPI.txt | 74 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ive/PublicAPI/net8.0-windows10.0.19041.0/PublicAPI.txt | 90 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ve/PublicAPI/net10.0-windows10.0.19041.0/PublicAPI.txt | 74 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ve/PublicAPI/net10.0-windows10.0.19041.0/PublicAPI.txt | 90 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ive/PublicAPI/net9.0-windows10.0.19041.0/PublicAPI.txt | 74 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ive/PublicAPI/net9.0-windows10.0.19041.0/PublicAPI.txt | 90 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ve/PublicAPI/net11.0-windows10.0.19041.0/PublicAPI.txt | 74 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| CRITICAL | …ve/PublicAPI/net11.0-windows10.0.19041.0/PublicAPI.txt | 90 | void ReactiveUI.Reactive.Maui.Internal.IMauiRoutedViewHost.SetObservedViewContract(string? contract) { } | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | src/ReactiveUI.Winforms/ViewModelViewHost.Designer.cs | 3 | // This code was generated by a tool. | COMMENT |
| HIGH | …ests/ReactiveUI.Tests/Properties/Resources.Designer.cs | 3 | // This code was generated by a tool. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | src/ReactiveUI/Platforms/mac/AutoSuspendHelper.cs | 28 | /// Example usage: | COMMENT |
| LOW | src/ReactiveUI/Platforms/android/AutoSuspendHelper.cs | 25 | /// Example usage: | COMMENT |
| LOW | src/ReactiveUI.Wpf.Shared/AutoSuspendHelper.cs | 24 | /// Example usage: | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | .github/workflows/sonarcloud.yml | 57 | # per-arity shape: after the shared scaffold is factored out, the residual is one typed | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | …activeUI.Shared/ReactiveCommand/ReactiveCommandBase.cs | 56 | /// As discussed above, you are under no obligation to somehow incorporate this into your <c>canExecute</c> observable | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | …c/ReactiveUI.Wpf.Shared/TransitioningContentControl.cs | 633 | // Do some special handling of particular transitions so that we get nice smooth transitions that utilize the si | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | …BlazorServer/Components/Layout/ReconnectModal.razor.js | 11 | function handleReconnectStateChanged(event) { | CODE |
| LOW | …BlazorServer/Components/Layout/ReconnectModal.razor.js | 59 | async function retryWhenDocumentBecomesVisible() { | CODE |