capacitor-performance
From the author
Diagnoses and fixes performance problems specific to Capacitor apps - slow cold start or long splash, white screen after camera/backgrounding (WKWebView "WebView process terminated" reload, Android onRenderProcessGone), large base64 payloads over the native bridge (Camera, Filesystem.readFile, CapacitorHttp), jank in the WebView, memory growth from unremoved plugin listeners, oversized Preferences storage, slow Android WebView versions, and debug logging left on in release. Covers profiling with Safari Web Inspector, chrome://inspect, Xcode Instruments, Android Studio Profiler, and adb timing commands. Do not use for crash/stack-trace debugging (use debugging-capacitor or capacitor-native-observability), device log capture (use ios-android-logs), offline data architecture (use capacitor-offline-first / sqlite-to-fast-sql), splash configuration details (use capacitor-splash-screen), or generic web performance unrelated to Capacitor.
Install
npx skills add Cap-go/capgo-skills --skill capacitor-performance -a claude-code
Installs to .claude/skills/capacitor-performance/ · Each command fetches the skill straight from GitHub with the open skills CLI.
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- debugging-capacitorCap-go/capgo-skillsDiagnoses and fixes runtime bugs in Capacitor iOS/Android apps - white/blank screen on launch, startup crashes, `"X" plugin is not implemented on ios/android`, `net::ERR_CLEARTEXT_NOT_PERMITTED`, App Transport Security blocks, CORS on capacitor://localhost, permission denials, live reload not connecting, and Capacitor 8.5+ UIScene regressions (appUrlOpen, universal links, pause/resume silent because AppDelegate callbacks stopped). Covers Safari Web Inspector, chrome://inspect, Xcode/LLDB, Android Studio, `npx cap run --url` (Capacitor 9) vs `-l --host` (8), `xcrun simctl openurl|privacy|push`, `xcrun devicectl device process launch|openURL`, `xctrace`. Do not use for only reading device logs (ios-android-logs), the UIScene migration itself (capacitor-uiscene-migration), deep-link setup (capacitor-deep-linking), speed (capacitor-performance), crash SDKs (capacitor-native-observability), tests (capacitor-testing), or upgrades/build errors (capacitor-app-upgrades, cocoapods-to-spm).Engineering★ 73
- capacitor-accessibilityCap-go/capgo-skillsMakes Capacitor apps work with VoiceOver, TalkBack, Dynamic Type / Android font scale, Switch Control, hardware keyboards, Reduce Motion and Increase Contrast. Covers Capacitor-specific gaps - WKWebView not following iOS Dynamic Type, Android WebView text zoom breaking layouts, zoomEnabled/user-scalable, SPA route changes not announced, native views under the WebView (maps, camera preview) being unreachable, @capacitor/screen-reader (isEnabled, speak, stateChange) and @capacitor/text-zoom (getPreferred, set) - plus testing with Accessibility Inspector, simctl content_size, adb font_scale, TalkBack and axe-core, mapped to WCAG 2.2. Do not use for Ionic component styling (use ionic-design), notch/home-indicator layout (use safe-area-handling), keyboard overlap bugs (use capacitor-keyboard), automated test framework setup (use capacitor-testing), or App Store metadata (use capacitor-app-store).Testing★ 73
- capacitor-splash-screenCap-go/capgo-skillsConfigures and debugs launch splash screens in Capacitor apps with @capacitor/splash-screen and @capacitor/assets - `launchAutoHide`, `SplashScreen.hide()`, `launchFadeOutDuration` (Android default changed 200 -> 0 in Capacitor 9), Android 12+ SplashScreen API theme (`Theme.SplashScreen`, `windowSplashScreenAnimatedIcon`), iOS `LaunchScreen.storyboard` + `Splash.imageset`, and Capacitor 8.5 UIScene/SceneDelegate effects (window created in code, Main.storyboard no longer supplies the root view controller). Use for white/black flash at launch, splash never hiding, cropped/tiny Android 12 icon, dark-mode splash, or regenerating icons and splash assets. Do not use for status/navigation bar color and insets (safe-area-handling), the UIScene migration itself (capacitor-uiscene-migration), or startup performance profiling (capacitor-performance).Engineering★ 73
- capacitor-testingCap-go/capgo-skillsTesting guide for Capacitor apps and plugins. Covers web-layer unit and component tests with Vitest and mocked Capacitor plugins (`vi.mock('@capacitor/core')`, `registerPlugin`), Playwright for the web build, Appium E2E with NATIVE_APP / WEBVIEW context switching, native plugin unit tests with Swift Testing vs XCTest (what can migrate, `CAPPluginCall` patterns, `xcodebuild test` on a simulator) and Android JUnit, plus an agent-driven verification loop on simulators and devices (build, install, launch, screenshot, UI hierarchy, tap, logs) with `xcrun simctl`, `xcrun devicectl`, `adb`, Xcode MCP device tools, and live reload via `npx cap run --url` (Capacitor 9) or `-l --host --port` (Capacitor 8). Use when adding tests, mocking plugins, "does it work on device", verifying a UI change on a simulator, migrating XCTest to Swift Testing, or setting up test CI. Do not use for crash log capture (ios-android-logs), WebView debugging sessions (debugging-capacitor), or build pipelines (capacitor-ci-cd).Testing★ 73
- capacitor-ci-cdCap-go/capgo-skillsDesigns and fixes CI/CD pipelines for Capacitor apps - GitHub Actions, GitLab CI, Fastlane, or Capgo Cloud Build (npx @capgo/cli@latest build request) - covering web build and tests, cap sync, iOS archive/export/upload with App Store Connect API keys, Android AAB signing and Play upload, Capgo live-update uploads, secrets, caching, and build-number bumping. Use when choosing runner images and toolchains (Node 22/24, macos-26 vs xcode-27 runners, JDK 21, Gradle 9 / AGP 9 for Capacitor 9), or when CI fails with errors like "No signing certificate", "requires a provisioning profile", "Unsupported class file major version", "Android Gradle plugin requires Java 17", "The engine node is incompatible", or "Could not find the web assets directory". Do not use for one-off manual store submission (capacitor-app-store), Capgo Cloud Build credential onboarding in depth (capgo-native-builds), Capgo channel/release strategy (capgo-release-workflows), or test authoring (capacitor-testing).Testing★ 73
- ios-android-logsCap-go/capgo-skillsGets, filters, streams, and saves logs and crash reports from Capacitor apps on iOS Simulator, iPhone, Android emulator and devices. Explains where Capacitor output goes (iOS bridge and mirrored JS console lines are stdout-only, so missing from Console.app and `log stream`; Android tags `Capacitor` and `Capacitor/Console`). Covers `xcrun simctl spawn booted log stream --predicate`, `simctl launch --console-pty`, `xcrun devicectl device process launch --console`, `log collect --device-udid`, Console.app, devicectl `systemCrashLogs`, `adb logcat --pid`, `-b crash`, Android Studio `package:mine`, tombstones, ANRs, `adb bugreport`. Use for "how do I see logs", "console.log not showing on device", "no logs in Console.app", "get the crash log", "logcat too noisy". Do not use for diagnosing the bug once logs are in hand (debugging-capacitor), production crash SDKs (capacitor-native-observability), MCP log tooling (capacitor-mcp), or profiling (capacitor-performance).DevOps★ 73
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