Migrate to .NET 10: add shared build config, CI, embedded stealth scripts, and tests by KSemenenko · Pull Request #1 · managedcode/playwright_stealth

KSemenenko · 2026-02-03T19:33:13Z

Motivation

Bring the Playwright.Stealth project in line with the Storage repo .NET 10 conventions so it builds and tests cleanly under .NET 10 (shared props, test runner, and CI).
Provide a packaged .NET API that exposes the original Playwright stealth evasions (embedded JS resources) and simple extension APIs so consumers can opt-in to stealth initialization.
Add baseline automated tests and a GitHub Actions workflow so builds and tests run in CI.

Description

Added shared configuration files: Directory.Build.props (targets .NET 10, enables analyzers, suppresses XML warnings, and enables MTP test support) and global.json (pins SDK 10.0.102 and opts into the Microsoft.Testing.Platform test runner).
Added GitHub Actions workflow .github/workflows/ci.yml that restores, builds and runs tests using dotnet on ubuntu-latest.
Implemented library surface: StealthConfig (options), StealthScriptProvider (loads embedded JS), and PlaywrightStealthExtensions exposing ApplyStealthAsync(this IPage, ...) and ApplyStealthAsync(this IBrowserContext, ...) which inject the combined init scripts.
Embedded original JS evasion scripts under src/Playwright.Stealth/Resources/js/*.js and added them as EmbeddedResource in the project file so StealthScriptProvider can load them at runtime.
Added test projects and tests: tests/Playwright.Stealth.Tests with StealthConfigTests (unit-style assertion of defaults) and StealthIntegrationTests (explicit integration test hitting external sites, gated by RUN_STEALTH_INTEGRATION_TESTS=1).
Updated README.md development instructions to use dotnet restore Playwright.Stealth.sln and dotnet test --solution Playwright.Stealth.sln --configuration Release and documented .NET SDK requirement 10.0.102+.

Testing

Ran dotnet build Playwright.Stealth.sln, which completed successfully (no errors).
Attempted dotnet test Playwright.Stealth.sln initially failed due to the .NET 10 MTP/VSTest mismatch; resolved by adding TestingPlatformDotnetTestSupport and a global.json test runner configuration as described in docs.
Ran dotnet test --solution Playwright.Stealth.sln --configuration Release, which executed the test assembly and passed the added StealthConfigTests (final summary: tests passed).

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chatgpt-codex-connector · 2026-02-03T19:36:27Z

src/Playwright.Stealth/Resources/js/navigator.platform.js

+    Object.defineProperty(Object.getPrototypeOf(navigator), 'platform', {
+        get: () => opts.navigator_plaftorm,


Fix typo so navigator.platform override works

The script gates on opts.navigator_platform but returns opts.navigator_plaftorm (typo), so when a caller sets StealthConfig.NavigatorPlatformValue, the injected getter returns undefined instead of the requested platform string. This silently disables the override and can also cause downstream fingerprinting checks to see an empty platform value, reducing the effectiveness of stealth for any run that provides a platform value. Renaming the property access to opts.navigator_platform fixes the mismatch.

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Pull request overview

This PR migrates the Playwright.Stealth library to .NET 10, adding shared build configuration, CI infrastructure, embedded JavaScript stealth evasion scripts, and automated tests. The implementation provides a .NET API wrapper around the original Playwright stealth scripts to help avoid bot detection in headless browser automation.

Changes:

Added .NET 10 project configuration with shared props, SDK pinning, and Microsoft.Testing.Platform support
Implemented library surface with StealthConfig, StealthScriptProvider, and extension methods for applying stealth scripts to pages/contexts
Added GitHub Actions CI workflow and basic test coverage including unit tests and integration tests

Reviewed changes

Copilot reviewed 31 out of 32 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
Directory.Build.props	Defines .NET 10 target framework, C# 14 language version, analyzer settings, and package metadata
global.json	Pins SDK to version 10.0.102 and configures Microsoft.Testing.Platform as the test runner
.github/workflows/ci.yml	CI workflow that restores, builds, and tests the solution on ubuntu-latest
src/Playwright.Stealth/Playwright.Stealth.csproj	Main library project file with Playwright dependency and embedded JS resources
src/Playwright.Stealth/StealthConfig.cs	Configuration class with boolean flags and options for stealth script behavior
src/Playwright.Stealth/StealthScriptProvider.cs	Internal class that loads embedded JS scripts and builds combined script output
src/Playwright.Stealth/PlaywrightStealthExtensions.cs	Public extension methods to apply stealth scripts to IPage and IBrowserContext
src/Playwright.Stealth/Resources/js/*.js	Embedded JavaScript stealth evasion scripts (17 files)
tests/Playwright.Stealth.Tests/Playwright.Stealth.Tests.csproj	Test project with TUnit framework dependencies
tests/Playwright.Stealth.Tests/StealthConfigTests.cs	Unit tests verifying StealthConfig default values
tests/Playwright.Stealth.Tests/StealthIntegrationTests.cs	Integration tests validating stealth behavior against bot detection sites
README.md	Documentation with installation, usage examples, and development instructions
Playwright.Stealth.sln	Solution file organizing source and test projects
.gitignore	Standard .NET gitignore configuration

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Copilot · 2026-02-03T19:39:48Z

src/Playwright.Stealth/Resources/js/chrome.csi.js

+if (!('csi' in window.chrome) && (window.performance || window.performance.timing)) {
+    const {csi_timing} = window.performance
+
+    log.info('loading chrome.csi.js')


The variable log is used but never defined. This will cause a ReferenceError when this script executes. Either remove the log.info call or ensure a log object is defined before use.

Copilot · 2026-02-03T19:39:49Z

src/Playwright.Stealth/Resources/js/chrome.csi.js

+// Check if we're running headful and don't need to mock anything
+// Check that the Navigation Timing API v1 is available, we need that
+if (!('csi' in window.chrome) && (window.performance || window.performance.timing)) {
+    const {csi_timing} = window.performance


The variable csi_timing is referenced but window.performance doesn't have a csi_timing property. This should likely be window.performance.timing to match the pattern used in other chrome.*.js files.

Suggested change

const {csi_timing} = window.performance

const csi_timing = window.performance.timing

Copilot · 2026-02-03T19:39:49Z

src/Playwright.Stealth/Resources/js/webgl.vendor.js

@@ -0,0 +1,25 @@
+console.log(opts)


Console.log statement left in production code. This debug output could reveal the presence of stealth modifications to bot detection systems. Consider removing it.

Suggested change

console.log(opts)

Copilot · 2026-02-03T19:39:49Z

Directory.Build.props

+    <RepositoryUrl>https://github.com/AtuboDad/playwright_stealth</RepositoryUrl>
+    <PackageProjectUrl>https://github.com/AtuboDad/playwright_stealth</PackageProjectUrl>


The repository URLs point to AtuboDad/playwright_stealth, which appears to be the Python version of the original library, not this .NET port. Consider updating these URLs to point to the actual repository for this .NET implementation if it's hosted separately, or clarify the relationship to the original Python project.

Suggested change

<RepositoryUrl>https://github.com/AtuboDad/playwright_stealth</RepositoryUrl>

<PackageProjectUrl>https://github.com/AtuboDad/playwright_stealth</PackageProjectUrl>

<RepositoryUrl>https://github.com/ManagedCode</RepositoryUrl>

<PackageProjectUrl>https://github.com/ManagedCode</PackageProjectUrl>

Copilot · 2026-02-03T19:39:50Z

tests/Playwright.Stealth.Tests/StealthIntegrationTests.cs

+        await Assert.That(bodyText.Contains("automation", StringComparison.OrdinalIgnoreCase)).IsFalse();
+    }
+
+    private sealed record StealthSite(string Url, string Name);


The Name property in the StealthSite record is defined but never used. Consider removing it if it's not needed, or use it in logging/reporting to make test failures more informative (e.g., include the site name in assertion failure messages).

Copilot · 2026-02-03T19:39:50Z

src/Playwright.Stealth/Resources/js/navigator.platform.js

@@ -0,0 +1,5 @@
+if (opts.navigator_platform) {
+    Object.defineProperty(Object.getPrototypeOf(navigator), 'platform', {
+        get: () => opts.navigator_plaftorm,


Typo in the property name: navigator_plaftorm should be navigator_platform. This will cause the platform override to not work correctly as it reads from opts.navigator_plaftorm instead of opts.navigator_platform.

Suggested change

get: () => opts.navigator_plaftorm,

get: () => opts.navigator_platform,

Copilot · 2026-02-03T19:39:50Z

src/Playwright.Stealth/Resources/js/window.outerdimensions.js

+        console.log(`current window outer height ${window.outerHeight}`)
+        window.outerHeight = window.innerHeight + windowFrame
+        console.log(`new window outer height ${window.outerHeight}`)


Console.log statements left in production code. These debug logs will be visible in the browser console and could reveal the presence of stealth modifications. Consider removing or conditionally enabling them.

Suggested change

console.log(`current window outer height ${window.outerHeight}`)

window.outerHeight = window.innerHeight + windowFrame

console.log(`new window outer height ${window.outerHeight}`)

window.outerHeight = window.innerHeight + windowFrame

Copilot · 2026-02-03T19:39:51Z

tests/Playwright.Stealth.Tests/StealthIntegrationTests.cs

+        await Assert.That(bodyText.Contains("bot", StringComparison.OrdinalIgnoreCase)).IsFalse();
+        await Assert.That(bodyText.Contains("headless", StringComparison.OrdinalIgnoreCase)).IsFalse();
+        await Assert.That(bodyText.Contains("automation", StringComparison.OrdinalIgnoreCase)).IsFalse();


This assertion checks if bodyText contains "bot", "headless", or "automation" in a case-insensitive manner, but the test is trying to assert these should NOT be present (expecting false). However, legitimate page content may contain these words (e.g., "robot", "About", "automatic"). Consider using more specific selectors or checks for bot detection warnings rather than substring matching on the entire body text.

Copilot · 2026-02-03T19:39:51Z

src/Playwright.Stealth/Resources/js/utils.js

+    newHandler[trap] = function() {
+      try {
+        // Forward the call to the defined proxy handler
+        return handler[trap].apply(this, arguments || [])


This use of variable 'arguments' always evaluates to true.

Suggested change

return handler[trap].apply(this, arguments || [])

return handler[trap].apply(this, arguments)

Align structure with Storage and .NET 10

ed35ee6

Copilot AI review requested due to automatic review settings February 3, 2026 19:33

KSemenenko added the codex label Feb 3, 2026 — with ChatGPT Codex Connector

Copilot started reviewing on behalf of KSemenenko February 3, 2026 19:33 View session

chatgpt-codex-connector bot reviewed Feb 3, 2026

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Copilot AI reviewed Feb 3, 2026

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KSemenenko added 2 commits February 3, 2026 20:40

Rename namespaces to ManagedCode prefix

a2158bd

Fix platform script and rename project files

37db930

KSemenenko merged commit e148f11 into main Feb 3, 2026
1 check passed

KSemenenko deleted the codex/create-open-source-nuget-package-with-playwright branch February 3, 2026 20:04

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Migrate to .NET 10: add shared build config, CI, embedded stealth scripts, and tests#1

Migrate to .NET 10: add shared build config, CI, embedded stealth scripts, and tests#1
KSemenenko merged 3 commits intomainfrom
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		Object.defineProperty(Object.getPrototypeOf(navigator), 'platform', {
		get: () => opts.navigator_plaftorm,

	const {csi_timing} = window.performance
	const csi_timing = window.performance.timing

		<RepositoryUrl>https://github.com/AtuboDad/playwright_stealth</RepositoryUrl>
		<PackageProjectUrl>https://github.com/AtuboDad/playwright_stealth</PackageProjectUrl>

	get: () => opts.navigator_plaftorm,
	get: () => opts.navigator_platform,

	return handler[trap].apply(this, arguments \|\| [])
	return handler[trap].apply(this, arguments)

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KSemenenko commented Feb 3, 2026

Motivation

Description

Testing

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