Toast v2 Implementation Plan

Overview

Revamp @tamagui/toast to v2, inspired by Sonner's excellent UX. Must be fully cross-platform using Tamagui's animation system - NO CSS cheats.

Reference Implementations

• ~/github/sonner - primary inspiration
• ~/github/base-ui - additional patterns
• @tamagui/sheet - gesture/drag patterns, resistive pull

Current Session Issues Found & Fixes

BUGS FOUND (need fixing)

1. Top position toasts outside frame ✅ FIXED

   • Issue: Toasts with top position were rendering outside the container
   • Fix: Changed from hardcoded bottom: 0 to dynamic {...(isTop ? { top: 0 } : { bottom: 0 })}

2. Action buttons overlapping ✅ FIXED

   • Issue: Cancel/Confirm buttons used ToastCloseButton (20x20px fixed) causing overlap
   • Fix: Created new ToastActionButton component with proper padding for text buttons

3. Hover stack → leave → rest fly away, one stays ✅ FIXED

   • Issue: When hovering stacked toasts then leaving, most toasts dismiss but one stays longer
   • Cause: pauseTimer was being called multiple times, double-counting elapsed time
   • Fix: Added lastPauseTimeRef guard (Sonner pattern) - only calculate elapsed time if timer was started after last pause

4. Exit animations fly too far ✅ FIXED

   • Issue: Toasts flew 100px on exit, too dramatic
   • Fix: Reduced to 30px for swipe, 10px for normal exit

5. Focus outline shows on click ✅ FIXED

   • Issue: Focus ring appeared on mouse click, should only show on keyboard
   • Fix: Changed focusStyle to focusVisibleStyle

6. Expanded state showed ALL toasts ✅ FIXED

   • Issue: When expanded, ALL toasts showed instead of respecting visibleToasts limit
   • Sonner behavior: visibleToasts limit applies in BOTH collapsed and expanded states
   • Fix: Changed opacity logic to hide toasts beyond visibleToasts in both states
   • Also added pointerEvents: 'none' for hidden toasts

CHANGES MADE THIS SESSION

1. visibleToasts default: 3 → 4
2. Fade out last visible toast - opacity 0.5 for toast at visibleToasts-1 index
3. Top position anchor - dynamic top/bottom based on position
4. ToastActionButton component - proper text button for action/cancel
5. Subtle exit animations - 10px/30px instead of 100px
6. focusVisibleStyle - outline only on keyboard navigation

DESIGN DECISIONS (user feedback)

1. Keep styles minimal in core - demo can add more styles
2. No sonnerStyle close button - keep it simple, inline close button is fine
3. Use animateOnly={['transform', 'opacity']} in examples for performance
4. Export .Close component - like Dialog, just wraps events without styling

Style Checklist

Container (Toaster)

• position: fixed (web) / absolute (native)
• z-index: 100000+ (very high)
• width: 356px (TOAST_WIDTH constant)
• Viewport offsets: 24px desktop
• pointerEvents: 'box-none' for pass-through

Position Variants

• bottom-right: bottom + right offsets
• bottom-left: bottom + left offsets
• bottom-center: bottom + left 50% + translateX(-50%)
• top-right: top + right offsets ✅ FIXED anchor
• top-left: top + left offsets ✅ FIXED anchor
• top-center: top + left 50% + translateX(-50%) ✅ FIXED anchor

Toast Item Frame

• position: absolute (within container)
• left: 0, right: 0 (full width of container)
• Dynamic anchor: top:0 for top positions, bottom:0 for bottom positions ✅ FIXED
• background: $background
• border-radius: $4 (8px)
• paddingHorizontal: $4, paddingVertical: $3
• border: 1px solid $borderColor
• elevation: $4 + shadow for depth
• focusable: true
• focusVisibleStyle instead of focusStyle ✅ FIXED

Toast Content Layout

• flex row with icon, content, close button
• icon: 16x16px, flex-shrink: 0
• content: flex column, gap $1
• title: fontWeight 600, $color, size $4
• description: $color11, size $2
• gap: $3 between elements

Close Button

• positioned inline (user decided against absolute overlap)
• 20x20px circle
• borderRadius: $10 (circular)
• backgroundColor: $color5
• hoverStyle: $color6
• pressStyle: $color7

Action Buttons ✅ FIXED

• New ToastActionButton component with proper sizing
• borderRadius: $2
• paddingHorizontal: $2
• height: 24px
• primary variant for action button (dark bg, light text)
• marginTop: $3 spacing
• gap: $2 between buttons
• justifyContent: flex-end

Rich Colors (Type Variants)

• success: $green2 background, $green6 border
• error: $red2 background, $red6 border
• warning: $yellow2 background, $yellow6 border
• info: $blue2 background, $blue6 border
• loading: default (neutral)

Icons

• success: ✓ in $green10
• error: ✕ in $red10
• warning: ⚠ in $yellow10
• info: ℹ in $blue10
• loading: ⟳ in $color11
• close: ✕ in $color11

Feature Checklist

Core Toast API

• toast() - basic toast
• toast.success() - success type
• toast.error() - error type
• toast.warning() - warning type
• toast.info() - info type
• toast.loading() - loading type (no auto-dismiss)
• toast.promise() - promise with loading/success/error states
• toast.custom() - custom JSX
• toast.dismiss(id) - dismiss specific toast
• toast.dismiss() - dismiss all

Toast Options

• id - custom id for updating
• title - main text (string or function)
• description - secondary text (string or function)
• duration - auto-dismiss time (default 4000ms)
• icon - custom icon
• action - action button with label/onClick
• cancel - cancel button
• dismissible - can be dismissed (default true)
• onDismiss - callback when dismissed
• onAutoClose - callback when auto-closed
• closeButton - per-toast close button override

Toaster Props

• position - 6 positions
• expand - always show expanded
• visibleToasts - max visible (default 4) ✅ CHANGED from 3
• gap - space between toasts (default 14px)
• duration - default duration (4000ms)
• offset - viewport padding (24px)
• hotkey - keyboard shortcut (alt+T)
• swipeDirection - dismiss direction ('right')
• swipeThreshold - swipe distance (50px)
• closeButton - show close buttons
• richColors - colored backgrounds
• icons - custom icons per type
• theme - light/dark/system

Stacking Behavior

• Only show visibleToasts (default 4)
• Scale down non-front toasts: 1 - (index * 0.05)
• Y-offset for collapsed stack: 10px per toast
• Expanded state shows full offset with gaps
• Front toast height applied to hidden toasts
• z-index: visibleToasts - index (front highest)
• transformOrigin: 'bottom center' for bottom, 'top center' for top
• Fade out last visible toast (opacity 0.5) ✅ NEW

Hover Expand ✅ COMPLETE

• Expand on hover (onMouseEnter + onMouseMove)
• Pause timers when expanded/hovered
• Resume timers when mouse leaves
• Gap filler View to prevent flicker when mouse moves between toasts
• Collapse when only 1 toast remains
• interacting state tracks pointer down/up
• Timer sync issue when leaving hover ✅ FIXED with lastPauseTimeRef guard

Swipe to Dismiss ✅ COMPLETE

• Pointer event tracking (setPointerCapture)
• Direction lock on first significant movement
• Threshold-based dismiss (50px default)
• Velocity-based dismiss (0.11 px/ms)
• Resistive pull in wrong direction (sqrt curve from Sheet)
• Exit animation in swipe direction
• Snap back on cancel

Enter/Exit Animations ✅ REFINED

• enterStyle: opacity 0, y: ±10, scale: 0.95 (subtle)
• exitStyle: opacity 0, x/y: ±30 for swipe, ±10 for normal, scale: 0.95
• AnimatePresence for mount/unmount
• transition: 'quick' (Tamagui animation)
• Disable animation while dragging

Keyboard Support

• Escape to dismiss focused toast
• Hotkey to expand toaster (alt+T)
• Focus management (tabIndex, lastFocusedElementRef)

Accessibility

• role="status"
• aria-live="polite"
• aria-atomic
• aria-label on container
• tabIndex for focusable
• aria-label="Close toast" on close button

Test Checklist

Basic Toast Tests ✅

• shows a default toast
• shows typed toasts (success, error, warning, info)
• shows loading toast
• shows multiple stacked toasts

Interaction Tests ✅

• dismisses all toasts
• closes toast when clicking close button
• keyboard escape dismisses focused toast
• shows action button

Promise Tests ✅

• promise toast transitions loading -> success
• promise toast shows error on rejection

Position Tests ✅

• changes position when clicking position buttons
• all 6 positions verified with screenshots

Hover Tests ✅

• hover expands stacked toasts
• hover pauses auto-dismiss timer
• mouse leave collapses stack
• no flicker when mouse moves between toasts

Swipe Tests ✅

• swipe right dismisses (default)
• swipe threshold works
• velocity-based dismiss
• resistive pull in wrong direction
• swipe cancel snaps back

Interrupt Tests ✅ NEW

• toast closing does not interrupt on mouse re-entry
• drag gesture moves toast visually
• fast swipe dismisses via velocity

TODO - Remaining Work (DEADLINE: 9:00 AM DEMO VIDEO)

TIMELINE

• NOW - 8:20: Fix top position bug, verify tests pass
• 8:20 - 8:35: Write clean ToastDemo, verify on tamagui.dev /ui/toast (mobile + safe areas)
• 8:35 - 8:45: Update docs, update version-two blog post
• 8:45 - 8:55: Full yarn test, lint, typecheck, sub-agent review
• 8:55 - 9:00: Clean commit, push to CI, /alert user

CRITICAL - Before 8:20

1. Fix timer sync bug ✅ DONE - added lastPauseTimeRef guard
2. FIX: Top position toast outside viewport ✅ FIXED - explicitly set top/bottom to avoid conflicts
3. Test action buttons after ToastActionButton fix ✅ VERIFIED - buttons render correctly

Before 8:35 (Demo Ready)

4. Write clean ToastDemo for tamagui.dev ✅ DONE - code/demos/src/ToastDemo.tsx
5. Verify on yarn dev site at /ui/toast ✅ VERIFIED - page renders, toast works
6. Mobile web + safe areas check (SSR safe!) ✅ FIXED - use-window-dimensions isClient guard
7. Web-only code but use conditionals for future native support

Before 8:45 (Docs + Blog)

8. Update Toast docs - clean up (2.0.0.mdx exists but has old API docs)
9. Update version-two blog post with Toast feature/demo hero

Before 8:55 (Testing + Review)

10. yarn test - 31 toast tests passing ✅
11. yarn lint, yarn typecheck ✅ - fixed biome issues, types clean
12. Sub-agent code review

Before 9:00 (Ship It)

13. Clean commit and push to CI
14. /alert user every 30s until acknowledged

Low Priority (Post-Demo)

• Export .Close component (Dialog pattern)
• Add animateOnly={['transform', 'opacity']} to examples
• All animation drivers tested
• SVG icons instead of text characters
• RTL support

Key Formulas (from Sonner)

Stack Scale

scale = 1 - (index * 0.05)
// index 0: 1.0, index 1: 0.95, index 2: 0.90

Collapsed Y Offset

// For bottom position
stackY = isFront ? 0 : -peekAmount * index
// For top position
stackY = isFront ? 0 : peekAmount * index

Expanded Y Offset

offset = (heightIndex * gap) + toastsHeightBefore
// For bottom: -offset
// For top: +offset

Resistive Pull (from Sheet)

function resisted(delta: number, maxResist = 25): number {
  if (delta >= 0) return delta
  const pastBoundary = Math.abs(delta)
  const resistedDistance = Math.sqrt(pastBoundary) * 2
  return -Math.min(resistedDistance, maxResist)
}

Velocity Threshold

VELOCITY_THRESHOLD = 0.11 // px/ms
shouldDismiss = passedThreshold || velocity > VELOCITY_THRESHOLD

Gap Filler (prevents hover flicker)

// Invisible hit area above/below toast when expanded
const gapFillerHeight = expanded ? gap + 1 : 0
<View
  position="absolute"
  left={0}
  right={0}
  height={gapFillerHeight}
  pointerEvents="auto"
  {...(isTop ? { top: '100%' } : { bottom: '100%' })}
/>

Opacity Fade for Limit

// Fade out toasts as they approach visibility limit
let computedOpacity = 1
if (!expanded) {
  if (index >= visibleToasts) {
    computedOpacity = 0 // completely hidden beyond limit
  } else if (index === visibleToasts - 1) {
    computedOpacity = 0.5 // last visible toast fades
  }
}

Files Modified

1. /code/ui/toast/src/Toaster.tsx

   • Container positioning with minHeight: 1
   • onMouseEnter + onMouseMove for hover expand
   • Auto-collapse when 1 toast remains
   • visibleToasts default: 4

2. /code/ui/toast/src/ToastItem.tsx

   • Stacking logic (scale, y, z-index, height, transformOrigin)
   • Gap filler View for hover flicker prevention
   • dataSet for RN Web data attribute compatibility
   • Enter/exit styles with AnimatePresence
   • Dynamic top/bottom anchor based on position
   • ToastActionButton component for action/cancel
   • focusVisibleStyle for keyboard-only focus
   • Subtle exit animations (10px/30px)
   • Opacity fade for limit

3. /code/ui/toast/src/useDragGesture.ts

   • Resistive pull with sqrt curve (Sheet pattern)
   • Direction lock on first movement
   • Velocity-based dismiss

4. /code/kitchen-sink/tests/ToastMultiple.test.tsx

   • Loading toast test fix (text selector vs data-type)

5. /code/kitchen-sink/tests/ToastHover.test.tsx - NEW

   • Hover expand tests
   • Flicker prevention tests
   • Timer pause tests

6. /code/kitchen-sink/tests/ToastVisual.test.tsx - NEW

   • Visual verification tests
   • Swipe tests

7. /code/kitchen-sink/tests/ToastInterrupt.test.tsx - NEW

   • Interrupt behavior tests
   • Drag gesture tests
   • Velocity dismiss tests

Test Results Summary

Total: 25 tests passing

• Toast.test.tsx: 3 tests (focus management)
• ToastMultiple.test.tsx: 12 tests (core API)
• ToastHover.test.tsx: 3 tests (hover behavior)
• ToastVisual.test.tsx: 4 tests (swipe, visual)
• ToastInterrupt.test.tsx: 3 tests (interrupt, drag, velocity)

All tests pass with CSS animation driver.