[dotnet] Annotate nullability on JavaScript protocol

[RenderMichael]

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Annotate nullability on JavaScript protocol

Motivation and Context

Contributes to #14640

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement, Bug fix

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Description

• Enabled nullable reference types in multiple JavaScript protocol classes.

• Added nullability annotations to event handlers and method parameters.

• Introduced ArgumentNullException checks for constructor parameters.

• Improved type safety for collections and nullable values.

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Changes walkthrough 📝

Relevant files

Enhancement

JavaScript.cs Annotated nullability in JavaScript base class                      dotnet/src/webdriver/DevTools/JavaScript.cs Enabled nullable reference types. Annotated event handlers with nullable types. +5/-3      V130JavaScript.cs Annotated nullability in V130 JavaScript implementation    dotnet/src/webdriver/DevTools/v130/V130JavaScript.cs Enabled nullable reference types. Added ArgumentNullException for constructor parameters. Updated event handlers and collections with nullable annotations. +12/-9    V131JavaScript.cs Annotated nullability in V131 JavaScript implementation    dotnet/src/webdriver/DevTools/v131/V131JavaScript.cs Enabled nullable reference types. Added ArgumentNullException for constructor parameters. Updated event handlers and collections with nullable annotations. +12/-9    V132JavaScript.cs Annotated nullability in V132 JavaScript implementation    dotnet/src/webdriver/DevTools/v132/V132JavaScript.cs Enabled nullable reference types. Added ArgumentNullException for constructor parameters. Updated event handlers and collections with nullable annotations. +12/-9    V85JavaScript.cs Annotated nullability in V85 JavaScript implementation      dotnet/src/webdriver/DevTools/v85/V85JavaScript.cs Enabled nullable reference types. Added ArgumentNullException for constructor parameters. Updated event handlers and collections with nullable annotations. +12/-9

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Event Handler Safety The nullable event handlers could lead to null reference exceptions if not properly checked before invocation. Consider adding null checks when raising events. public event EventHandler<BindingCalledEventArgs>? BindingCalled; /// <summary> /// Occurs when the browser's JavaScript console API is called. /// </summary> public event EventHandler<ConsoleApiCalledEventArgs>? ConsoleApiCalled; /// <summary> /// Occurs when a JavaScript exception is thrown. /// </summary> public event EventHandler<ExceptionThrownEventArgs>? ExceptionThrown;

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Add null check for event args Initialize the args list before the foreach loop to avoid potential null reference exceptions. Move the list declaration outside the loop scope. dotnet/src/webdriver/DevTools/v130/V130JavaScript.cs [168-175] private void OnRuntimeConsoleApiCalled(object? sender, ConsoleAPICalledEventArgs e) { + if (e?.Args == null) + return; + List<ConsoleApiArgument> args = new List<ConsoleApiArgument>(e.Args.Length); foreach (var arg in e.Args) { string? argValue = arg.Value?.ToString(); args.Add(new ConsoleApiArgument(arg.Type.ToString(), argValue)); } Apply this suggestion Suggestion importance[1-10]: 8 __ Why: The suggestion adds important null checks for the event args and its Args property, preventing potential NullReferenceException in the event handler. This is a critical defensive programming practice when dealing with event handlers.	Medium

[RenderMichael]

Failures are unrelated to this PR

//java/test/org/openqa/selenium/mobile:NetworkConnectionTest
//java/test/org/openqa/selenium/remote:RemoteWebDriverScreenshotTest
//java/test/org/openqa/selenium/remote:RemoteWebDriverScreenshotTest-firefox-beta
//rb/spec/integration/selenium/webdriver:network-firefox-beta-bidi
//rb/spec/integration/selenium/webdriver:network-firefox-bidi