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nativescript

@nativescript source repo

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• 10 hours ago last updated

1. ▌
   Fix · nativescript bundle

   Debug and fix a bug end-to-end (GitHub issue or free-text report → trace → root cause → fix → test → PR). Use anytime you need to fix broken, throwing, or misbehaving code in this workspace.
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2. ▌
   Feat · nativescript bundle

   Build a feature or enhancement end-to-end (GitHub issue or free-text description → plan → implement → test → PR). Use anytime you need to add functionality to a package in this workspace.
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3. ▌
   Refactor · nativescript bundle

   Restructure existing code without changing behavior (scope → baseline tests → small verified steps → PR). Use anytime you need to clean up, reorganize, or simplify code in this workspace.
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4. ▌
   Unit Testing · nativescript bundle

   How to run and write unit tests in this workspace (Vitest, colocated .spec.ts files, mocked native globals). Use when writing, changing, or running tests.
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5. ▌
   Ns Top Nav · nativescript

   Use when adding a screen header, back button, or top-bar actions, or when a page's header looks non-native, misaligned, or shows a phantom app-name toolbar on Android — decide between the native ActionBar and a synthetic layout-built header, then implement it with the NavigationButton/ActionItem platform asymmetries handled (iOS tap never fires; Android font:// icons rasterize at CSS font-size).
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6. ▌
   Ns Line Height · nativescript

   Use when multi-line Labels show huge gaps between wrapped lines, text looks fine single-line but wrong wrapped, or when configuring @nativescript/tailwind typography — CSS line-height in NativeScript means ADDITIVE space between lines (iOS paragraphStyle.lineSpacing, Android setLineSpacing), not the web's total line box, so web values like 24 or 1.5 inject giant or no-op spacing.
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7. ▌
   Ns IOS Widgets · nativescript

   Use when adding iOS Home Screen widgets, Live Activities, or Dynamic Island UI to a NativeScript app (ns widget ios, WidgetKit, ActivityKit), when a Live Activity never appears or renders empty ("Archive was nil. LiveActivity will be empty"), when a widget shows stale/no data, or when a widget image asset renders blank — App Group data flow, the @objcMembers JS bridge, and the three silent image traps.
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8. ▌
   Ns Web Globals · nativescript

   Use when NativeScript code reaches for a browser/Node global — fetch, AbortController, matchMedia, TextEncoder, crypto, atob, Blob, FormData, localStorage, document — and you need to know what exists, what throws "AbortController is not defined", and what to import instead.
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9. ▌
   Ns Snippets · nativescript

   Use when you need a known-good NativeScript pattern before writing one from scratch, want to share a reusable snippet you just wrote, or are handed a snippets.nativescript.org URL — the public JSON API to search, read, publish (admin-reviewed), and delete NativeScript code snippets, no auth or SDK needed.
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10. ▌
    Ns CSS Keyframes · nativescript

    Use when a CSS @keyframes animation animates nothing, snaps back at the end, or ignores animation-direction alternate / animation-play-state — only 12 properties (+transform) are animatable and everything else is silently dropped, fill-mode forwards is required to keep the end state, a unitless animation-delay is seconds, and keyframes under a non-matching @media come back null.
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11. ▌
    Ns CSS Selectors · nativescript

    Use when a NativeScript CSS rule silently doesn't apply and you're asking "does NativeScript support this selector?" — the supported selector set (:not/:is/:where/:pressed/:hovered/@media/attribute operators), :where()'s zero specificity, bare [attr] selectors matching nothing, per-declaration (not per-block) error recovery, and the className-swap stale-background workaround.
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12. ▌
    Ns HTTP Gotchas · nativescript

    Use when Http.getJSON/getString from @nativescript/core resolve happily on a 404/500, reject with a JSON parse error that masks an HTTP error, or when picking between Http.request and fetch — the convenience helpers never check statusCode, error pages become "data", and content conversion is where the rejection actually comes from.
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13. ▌
    Ns Multi Window · nativescript

    Use when adopting the NativeScript 9.1 multi-window/NativeWindow model — Application.primaryWindow/activeWindow/getWindows, setWindowContentResolver, openWindow for iPad multi-scene or Android multi-activity, migrating off the deprecated launch event, or per-window orientation()/systemAppearance() — including the Android launchMode manifest requirement openWindow logs about.
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14. ▌
    Ns Keyboard Input · nativescript

    Use when the iOS/Android keyboard covers a text input, when building a chat/composer/search bar docked to the keyboard, or when choosing between @nativescript/iqkeyboardmanager and @nativescript/input-accessory — the decision framework, the docked-composer implementation (TextView not TextField, tab-bar exclusion rule), and the verification workflow.
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15. ▌
    Ns Color Formats · nativescript

    Use when constructing new Color(...) from hex strings, ints, or rgb()/hsl() syntax, reading color.hex / color.argb, or colors come out with wrong alpha — hex STRINGS are RRGGBBAA (alpha last) while argb ints and the 4-arg constructor are alpha-FIRST, .hex drops the alpha when opaque, and short hex doubles each nibble.
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16. ▌
    Ns View Animations · nativescript

    Use when calling view.animate() / createAnimation().play(), hitting "Animation is already playing.", "Animation cancelled.", "cannot animate height on root view" or "Animating property 'X' is unsupported", or when a cancelled animation's promise never settles on iOS — the two rejection shapes, synchronous validation throws, absolute (not relative) transforms, and the per-platform cancel asymmetry.
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17. ▌
    Ns Root CSS Classes · nativescript

    Use when writing platform-, device-, orientation-, or theme-conditional CSS without JS branching — the framework stamps ns-root/ns-modal, ns-android/ns-ios/ns-visionos, ns-phone/ns-tablet, ns-portrait/ns-landscape, ns-dark/ns-light, ns-ltr/ns-rtl plus a per-SDK class like ns-ios-17 on every root view; modals get ns-modal instead of ns-root, and neither ns-dark nor ns-light exists on iOS 12 and below.
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18. ▌
    Ns Touch Animations · nativescript

    Use when adding any tappable UI (buttons, pills, chips, cards), reviewing touch/press animation code, or tuning tap feel — enable TouchManager.enableGlobalTapAnimations once instead of wiring per-view touch handlers or manual scale animations, opt views out with ignoreTouchAnimation (singular — the plural is silently ignored), and override per-view with the touchAnimation property.
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19. ▌
    Ns Unit Testing · nativescript

    Use when setting up or running unit tests in a NativeScript app (ns test init, ns test ios/android, vitest.config.mts), migrating off Karma, or hitting runner errors like "No test entrypoint (test.ts or test.js) found", "NativeScript test ... was not bundled", or "NativeScript Vitest worker 0 did not connect" — @nativescript/unit-test-runner v5 runs Vitest 4 specs inside the real iOS/Android runtimes over a WebSocket bridge.
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20. ▌
    Ns IOS Corespotlight · nativescript

    Use when adding CoreSpotlight/system-search indexing to a NativeScript iOS app, when an app freezes or becomes unresponsive shortly after launch/data load, or when a hang report shows the main thread stuck in v8::Locker::Initialize — indexSearchableItems enumerates JS-array adapters on dispatch_apply worker threads and deadlocks the V8 isolate unless you materialize real NSArrays and hop completion handlers back to the main thread.
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21. ▌
    Ns CSS Variables Calc · nativescript

    Use when using var(--x, fallback) or calc() in NativeScript CSS, when view.width reads back as a unit object instead of a number, or when a calc() mixing px and % never evaluates — the var() fallback truth table, the unit-dependent return shapes of calc(), and percent values being fractions (50% parses to value 0.5).
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22. ▌
    Ns Listview Recycling · nativescript

    Use when a ListView janks or stutters while scrolling, an itemTemplates template never applies, analytics or side effects in itemLoading fire far too often, or when writing itemLoading handlers / itemTemplateSelector / refresh() — the args.view recycling contract (only create when absent), the selector's silent fallback to the default template on unknown keys, and why refresh() re-fires itemLoading for every item.
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23. ▌
    Ns Trace Debugging · nativescript

    Use when debugging layout, binding, navigation, or native lifecycle issues with @nativescript/core Trace and getting no output — Trace.enable() alone prints nothing without addCategories, Trace.categories.All omits Accessibility and BindingError, console lines are prefixed with the category name, and Trace.error() THROWS by default.
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24. ▌
    Ns File Qualifiers · nativescript

    Use when naming platform/size/orientation file variants (page.ios.xml, home.land.css, main.minWH600.xml) or debugging why a variant file is ignored — the supported qualifiers are minWH/minW/minH/land/port/android/ios in that priority order, .land beats .ios, and .tablet/.phone are NOT qualifiers at all (they silently never load).
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25. ▌
    Ns Root Layout Overlays · nativescript

    Use when building in-app overlays, toasts, popups, or bottom sheets without a native modal — getRootLayout().open with shadeCover and enter/exit animations, close/closeAll/bringToFront, and the traps — getRootLayout() returns the FIRST registered RootLayout (not the topmost), every method rejects its promise on misuse ("View ... has already been added to the root layout"), and open() zeroes the view opacity before animating.
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26. ▌
    Ns Tabview Lazy Loading · nativescript

    Use when initializing per-tab work in a TabView (data fetches or loaded/unloaded handlers on tab content) behaves differently per platform, or a heavy neighbouring tab slows first paint — Android preloads one off-screen tab by default (its content fires loaded for tabs the user never opened) while iOS cannot preload; androidOffscreenTabLimit = 0 normalizes both.
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27. ▌
    Ns Binding Expressions · nativescript

    Use when an XML {{ }} binding throws "Invalid expression syntax", "Disallowed binary operator", or "Invalid converter syntax", when arrow functions in bindings fail, when a binding writes garbage back to the model, or when wiring $value/$parent/$parents/converters — the expression allow-list, the two-way-by-default write-back and its string-substitution hazard, and the silent-global fallback for typo'd names.
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28. ▌
    Ns IOS Safe Area Smudge · nativescript

    Use when an iOS list shows a random colored streak, stretched dot/pill, or gray band near the bottom edge while scrolling, or a card/list shows an unexplained empty band at its bottom on load — NativeScript's iOS safe-area expansion stretches any small view (dots, hairline dividers, row backgrounds) whose edge lands on the safe-area boundary; fix with iosOverflowSafeArea="false" on the leaves and iosOverflowSafeAreaEnabled="false" on card containers, never on the scroll viewport.
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29. ▌
    Ns IOS Scroll Under Bars · nativescript

    Use when a ScrollView/ListView visibly cuts off at a hard line above the tab bar or bottom edge on iOS, when content hides behind a floating/translucent bar with no way to scroll it clear, or when reviewing any iosOverflowSafeArea usage — scroll viewports must extend under floating chrome to the physical screen edge, with clearance padding inside the content.
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30. ▌
    Ns Formatted String Spans · nativescript

    Use when mixing styles inside one Label/Button via FormattedString and Span, when a span's colour never applies, or when label.text stops updating after formatted text was shown — setting text while formattedText is set is a silent no-op, the span colour property is `color` (there is no working foregroundColor), Span.text collapses only the first newline/tab, and a span becomes tappable just by adding a linkTap listener.
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31. ▌
    Ns XML Custom Components · nativescript

    Use when authoring NativeScript XML — custom components via xmlns, codeFile/cssFile/import attributes, ios:/android: attribute prefixes vs <ios>/<android> element blocks — or when decoding a "Building UI from XML." error like "Module not found for element", including why template contents only throw when the template first renders.
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32. ▌
    Ns Code Built View Styling · nativescript

    Use when building views in TypeScript with new Label()/new StackLayout() (RootLayout overlays, programmatic dialogs/toasts) or when such a view renders unstyled or ignores dark mode — Tailwind utility classes can be purged when they appear only in code, and dark mode needs an explicit Application.systemAppearance() check.
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33. ▌
    Ns Gridlayout Spec Strings · nativescript

    Use when writing GridLayout rows/columns spec strings ("auto, *, 2*"), hitting "Cannot parse item spec from string" or "itemSpec is already added to GridLayout", or when a grid column/row silently renders as a 1dp hairline — fr and % units parseInt to garbage without erroring, 'auto' is case-sensitive (Auto throws), numbers are dip not px, grid.rows is write-only, and gap only works on FlexboxLayout.
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34. ▌
    Ns Input Accessory Dialogs · nativescript

    Use when a @nativescript/input-accessory docked composer bar floats ON TOP of a page sheet, alert, or popover on iOS, fails to reappear after a modal, or reappears on its own — the bar lives in the keyboard's own window (UITextEffectsWindow), which UIKit z-orders above sheet presentations, so it must be suspended on dialog open and restored on close.
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35. ▌
    Ns Navigation Transitions · nativescript

    Use when writing or reviewing any Frame.navigate / RouterExtensions.navigate call, when a push/back animation looks flat, janky, or "web-like", or when deciding between animated false, clearHistory, or a custom transition — omit explicit transition options so pages animate with the platform-default navigation transition.
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36. ▌
    Ns Android Edge To Edge · nativescript

    Use when an Android bottom tab bar shows a hard color edge above the gesture-nav strip, bottom-docked UI (composer, action bar) hides behind the gesture pill, content collides with the status bar after touching androidOverflowEdge, or Utils.android.setNavigationBarColor / setStatusBarColor appears to do nothing — how @nativescript/core 9.1+ edge-to-edge insets actually work on API 35+, with recipes for seamless bottom bars and docked bottom UI.
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37. ▌
    Ns Android Window Insets · nativescript

    Use when showing a fullscreen native modal on Android (view.showModal with fullscreen true) or wiring androidOverflowEdge / androidOverflowInset anywhere — how window insets (status bar / nav bar / IME) flow through @nativescript/core's edge-to-edge system, and the fullscreen-modal trap where unconsumed insets pad every Label (~50dp-inflated text boxes, phantom gaps, invisible emoji, content under the status bar — iOS unaffected).
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38. ▌
    Ns Observable Set Semantics · nativescript

    Use when Observable.set() doesn't fire propertyChange, when vm.someProp reads null while vm.get('someProp') works (fromObject accessor gap), when a View's propertyChange listener never fires (views raise textChange/checkedChange-style events instead), or when a listener won't detach or once('tap') keeps firing — set() compares by reference (WrappedValue.wrap is the escape hatch), fromObject only creates accessors for creation-time keys, and comma-joined event names subscribe to nothing.
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39. ▌
    Ns Uncaught Error Policy · nativescript

    Use when a NativeScript app that used to crash on JS errors now silently keeps running (9.1 behavior change), when configuring uncaughtErrorPolicy in nativescript.config.ts, or when removing discardUncaughtJsExceptions — 'report' (the new default) logs and fires Application.uncaughtErrorEvent without crashing, 'throw' restores native crashes for crash reporters, and the key only works at the config's TOP level.
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40. ▌
    Ns Page Navigation Lifecycle · nativescript

    Use when ordering work across Page events (navigatingTo, loaded, navigatedTo, navigatingFrom, unloaded, navigatedFrom), passing context between pages, or controlling the backstack (clearHistory, backstackVisible, canGoBack) — the exact event order, what Frame.topmost().currentPage is at each step, and the backstack rules the framework's own tests assert.
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41. ▌
    Ns Observable Array Change Events · nativescript

    Use when handling ObservableArray change events (on('change', ...), ChangedData, args.action/index/addedCount/removed) or when a list misses updates after array.length = n — length assignments emit 'splice' (never add/delete), push reports the pre-push index, setItem's removed holds the old value, and the ObservableArray constructor has a numeric-arity trap.
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42. ▌
    Simdeck · nativescript

    Use for simulator lifecycle, app install/launch, live viewing, UI inspection, touch/keyboard automation, screenshots, recordings, logs, pasteboard, hardware controls, and repeatable simulator flows.
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