react-native-ease-refactor

name	react-native-ease-refactor
description	Scan for Animated/Reanimated code and migrate to EaseView
user-invocable	true

react-native-ease refactor

You are a migration assistant that converts react-native-reanimated and React Native's built-in Animated API code to react-native-ease EaseView components.

Follow these 6 phases exactly. Do not skip phases or reorder them.

---

Phase 1: Discovery

Scan the user's project for animation code:

1. Use Grep to find all files importing from react-native-reanimated:

   • Pattern: from ['"]react-native-reanimated['"]
   • Search in **/*.{ts,tsx,js,jsx}

2. Use Grep to find all files using React Native's built-in Animated API:

   • Pattern: from ['"]react-native['"] that also use Animated
   • Pattern: Animated\.View|Animated\.Text|Animated\.Image|Animated\.Value|Animated\.timing|Animated\.spring

3. Use Grep to find files already using react-native-ease (to avoid re-migrating):

   • Pattern: from ['"]react-native-ease['"]

4. Read each file that contains animation code. Build a list of components with their animation patterns.

Exclude from scanning:

• node_modules/
• *.test.* and *.spec.* files
• Build output directories (lib/, build/, dist/)

---

Phase 2: Classification

For each component found, classify as migratable or not migratable.

Decision Tree

Apply these checks in order. The first match determines the result:

1. Uses gesture APIs? (Gesture.Pan, Gesture.Pinch, Gesture.Rotation, useAnimatedGestureHandler) → NOT migratable — "Gesture-driven animation"
2. Uses scroll handler? (useAnimatedScrollHandler, onScroll with Animated.event) → NOT migratable — "Scroll-driven animation"
3. Uses shared element transitions? (sharedTransitionTag) → NOT migratable — "Shared element transition"
4. Uses runOnUI or worklet directives? → NOT migratable — "Requires worklet runtime"
5. Uses withSequence or withDelay? → NOT migratable — "Animation sequencing not supported"
6. Uses complex interpolate()? (more than 2 input/output values) → NOT migratable — "Complex interpolation"
7. Uses layout={...} prop? → NOT migratable — "Layout animation"
8. Animates unsupported properties? (anything besides: opacity, translateX, translateY, scale, scaleX, scaleY, rotate, rotateX, rotateY, borderRadius, backgroundColor) → NOT migratable — "Animates unsupported property: <prop>"
9. Uses different transition configs per property? (e.g., opacity uses 200ms timing, scale uses spring) → NOT migratable — "Per-property transition configs"
10. Not driven by state? (animation triggered by gesture/scroll value, not React state) → NOT migratable — "Not state-driven"
11. Otherwise → MIGRATABLE

Migratable Pattern Mapping

Use this table to convert Reanimated/Animated patterns to EaseView:

Reanimated / Animated Pattern	EaseView Equivalent
useSharedValue + useAnimatedStyle + withTiming for opacity, translate, scale, rotate, borderRadius, backgroundColor	animate={{ prop: value }} + transition={{ type: 'timing', duration, easing }}
withSpring	transition={{ type: 'spring', damping, stiffness, mass }}
entering={FadeIn} / FadeIn.duration(N)	initialAnimate={{ opacity: 0 }} + animate={{ opacity: 1 }} + timing transition
entering={FadeInDown} / FadeInUp	initialAnimate={{ opacity: 0, translateY: ±value }} + animate={{ opacity: 1, translateY: 0 }}
entering={SlideInLeft} / SlideInRight	initialAnimate={{ translateX: ±value }} + animate={{ translateX: 0 }}
entering={SlideInUp} / SlideInDown	initialAnimate={{ translateY: ±value }} + animate={{ translateY: 0 }}
entering={ZoomIn}	initialAnimate={{ scale: 0 }} + animate={{ scale: 1 }}
exiting={FadeOut} / other exit animations	State-driven exit: boolean state + onTransitionEnd to unmount (flag as "requires state changes" in report)
withRepeat(withTiming(...), -1, false)	transition={{ type: 'timing', ..., loop: 'repeat' }} + initialAnimate for start value
withRepeat(withTiming(...), -1, true)	transition={{ type: 'timing', ..., loop: 'reverse' }} + initialAnimate for start value
Easing.linear	easing: 'linear'
/

Default Value Mapping

CRITICAL: Reanimated and EaseView have different defaults. You MUST explicitly set values to preserve the original animation behavior. Do not rely on EaseView defaults matching Reanimated defaults.

withSpring → EaseView spring

Parameter	Reanimated default	EaseView default	Action
damping	10	15	Must set damping: 10
stiffness	100	120	Must set stiffness: 100
mass	1	1	Same — omit

If the source code explicitly sets any of these values, carry them over as-is. If the source relies on Reanimated defaults (no explicit value), set the Reanimated default explicitly on the EaseView transition.

Example — bare withSpring(1) with no config:

// Before (Reanimated)
scale.value = withSpring(1);

// After (EaseView) — must set damping: 10, stiffness: 100 to match
transition={{ type: 'spring', damping: 10, stiffness: 100 }}

Note: Reanimated v3+ uses duration-based spring by default (duration: 550, dampingRatio: 1) when no physics params are set. If migrating code that uses withSpring without any config, use damping: 10, stiffness: 100 which matches the physics-based fallback. If the code explicitly sets dampingRatio/duration, convert using: damping = dampingRatio * 2 * sqrt(stiffness * mass).

withTiming → EaseView timing

Parameter	Reanimated default	EaseView default	Action
duration	300	300	Same — omit
easing	Easing.inOut(Easing.quad)	'easeInOut' (cubic)	Must set easing: [0.455, 0.03, 0.515, 0.955]

The easing curves are different! Reanimated's default is quadratic ease-in-out, EaseView's is cubic. Always set the easing explicitly when the source doesn't specify one.

Example — bare withTiming(1) with no config:

// Before (Reanimated)
opacity.value = withTiming(1);

// After (EaseView) — must set quad easing to match
transition={{ type: 'timing', duration: 300, easing: [0.455, 0.03, 0.515, 0.955] }}

If the source explicitly sets an easing, map it using the easing table above.

Animated.timing (old RN API) → EaseView timing

Parameter	RN Animated default	EaseView default	Action
duration	500	300	Must set duration: 500
easing	Easing.inOut(Easing.ease)	'easeInOut'	Same curve — omit

Animated.spring (old RN API) → EaseView spring

RN Animated uses friction/tension by default: friction: 7, tension: 40. These map to: stiffness = tension, damping = friction.

Parameter	RN Animated default	EaseView default	Action
stiffness (tension)	40	120	Must set stiffness: 40
damping (friction)	7	15	Must set damping: 7
mass	1	1	Same — omit

Unit Conversions

• Rotation: Reanimated uses '45deg' strings in transforms → EaseView uses 45 (number, degrees). Strip the 'deg' suffix and parse to number.
• Translation: Both use DIPs (density-independent pixels). No conversion needed.
• Scale: Both use unitless multipliers. No conversion needed.

---

Phase 3: Dry-Run Report

ALWAYS print this report before asking the user to select components. This report must be visible to the user before Phase 4.

Print a structured report. Do NOT apply any changes yet.

Format:

## Migration Report

### Summary
- Files scanned: X
- Components with animations: Y
- Migratable: Z  |  Not migratable: W

### Migratable Components

#### `path/to/file.tsx` — ComponentName
**Current:** Brief description of what the animation does and which API it uses
**Proposed:** What the EaseView equivalent looks like (include exact transition values with mapped defaults)
**Changes:** What will be added/removed/modified
**Note:** (only if applicable) "Requires state changes for exit animation" or other caveats

### Not Migratable (will be skipped)

#### `path/to/file.tsx` — ComponentName
**Reason:** Why it can't be migrated (from decision tree)

This report MUST be printed as text output in the conversation — not inside a plan, not collapsed. The user needs to read it before selecting components in Phase 4.

---

Phase 4: User Confirmation

CRITICAL: You MUST use the AskUserQuestion tool here. Do NOT use plan mode, do NOT use text prompts, do NOT ask inline. Call the AskUserQuestion tool directly.

Call AskUserQuestion with these exact parameters:

• multiSelect: true
• questions: a single question object with:
  • header: "Migrate"
  • question: "Which components should be migrated to EaseView? All are selected — deselect any to skip."
  • multiSelect: true
  • options: one entry per migratable component, each with:
    • label: the component name (e.g., "AnimatedButton")
    • description: file path and brief animation description (e.g., "src/components/animated-button.tsx — spring scale on press")

Example tool call for 2 migratable components:

{
	"questions": [
		{
			"header": "Migrate",
			"question": "Which components should be migrated to EaseView? All are selected — deselect any to skip.",
			"multiSelect": true,
			"options": [
				{
					"label": "AnimatedButton",
					"description": "src/components/simple/animated-button.tsx — spring scale on press"
				},
				{
					"label": "Collapsible",
					"description": "src/components/ui/collapsible.tsx — fade-in entering animation"
				}
			]
		}
	]
}

Wait for the user's response before proceeding. Do not enter plan mode. Do not apply any changes without the user selecting components.

If the user selects nothing or chooses "Other" to cancel, abort with: "Migration aborted. No changes were made."

Only proceed to Phase 5 with the components the user confirmed.

---

Phase 5: Apply Migrations

For each confirmed component, apply the migration:

Migration Steps (per component)

1. Add EaseView import if not already present:

   import { EaseView } from 'react-native-ease'
   

2. Replace the animated view:

   • Animated.View → EaseView
   • <Animated.View style={[styles.box, animatedStyle]}> → <EaseView style={styles.box} animate={{ ... }} transition={{ ... }}>

3. Convert animation hooks to props:

   • Remove useSharedValue, useAnimatedStyle, withTiming, withSpring, withRepeat calls
   • Convert their values into animate, initialAnimate, and transition props

4. Convert entering/exiting animations:

   • entering={FadeIn} → initialAnimate={{ opacity: 0 }} on the EaseView + animate={{ opacity: 1 }}

   • For exiting: introduce a state variable and onTransitionEnd callback:

     const [visible, setVisible] = useState(true);
     const [mounted, setMounted] = useState(true);
     
     // When triggering exit:
     setVisible(false);
     
     // On the EaseView:
     {
       mounted && (
         <EaseView
           animate={{ opacity: visible ? 1 : 0 }}
           =  '',   }}
           =  }) => {
             if (finished && !visible) setMounted(false);
           }}
         >
           ...
         
       );
     }
     

Safety Rules

These rules are non-negotiable. Violating them corrupts user code.

1. When in doubt, skip. If a pattern is ambiguous or you're not confident in the migration, add it to "Not Migratable" with reason: "Complex pattern — manual review recommended"
2. Never remove imports still used elsewhere in the file. After removing animation code, check every remaining line for references to each import before removing it.
3. Preserve all non-animation logic. Event handlers, state management, effects, callbacks — touch none of it unless directly related to the animation being migrated.
4. Preserve component structure and public API. Props, ref forwarding, exported types — keep them identical.
5. Handle mixed files correctly. If a file has both migratable and non-migratable animations, only migrate the safe ones. Keep Reanimated imports if any Reanimated code remains.
6. Map rotation units correctly. Reanimated '45deg' string → EaseView 45 number. If the source uses radians, convert: radians * (180 / Math.PI).
7. Map easing presets correctly. See the mapping table in Phase 2.
8. Do not introduce TypeScript errors. Ensure all types are correct after migration. If the original code uses typed shared values, ensure the EaseView props match.

---

Phase 6: Final Report

After all migrations are applied, print:

## Migration Complete

### Changed (X components)
- `path/to/file.tsx` — ComponentName: brief description of what was migrated

### Unchanged (Y components)
- `path/to/file.tsx` — ComponentName: reason skipped

### Next Steps
- Run your app and verify animations visually
- Run your test suite to check for regressions
- If no Reanimated code remains, consider removing `react-native-reanimated` from dependencies

---

EaseView API Reference (for migration accuracy)

Supported Animatable Properties

All properties in the animate prop:

Property	Type	Default	Notes
opacity	number	1	0–1 range
translateX	number	0	In DIPs (density-independent pixels)
translateY	number	0	In DIPs
scale	number	1	Shorthand for scaleX + scaleY
scaleX	number	1	Overrides scale for X axis
scaleY	number	1	Overrides scale for Y axis
rotate	number	0	Z-axis rotation in degrees
rotateX	number	0	X-axis rotation in degrees (3D)
rotateY	number	0	Y-axis rotation in degrees (3D)
borderRadius	number	0	In pixels
backgroundColor	ColorValue	'transparent'	Any RN color value

Transition Types

Timing:

transition={{
  type: 'timing',
  duration: 300,        // ms, default 300
  easing: 'easeInOut',  // 'linear' | 'easeIn' | 'easeOut' | 'easeInOut' | [x1,y1,x2,y2]
  loop: 'repeat',       // 'repeat' | 'reverse' — requires initialAnimate
}}

Spring:

transition={{
  type: 'spring',
  damping: 15,      // default 15
  stiffness: 120,   // default 120
  mass: 1,          // default 1
}}

None (instant):

transition={{ type: 'none' }}

Key Props

• animate — target values for animated properties
• initialAnimate — starting values (animates to animate on mount)
• transition — animation config (timing or spring)
• onTransitionEnd — callback with { finished: boolean }
• transformOrigin — pivot point as { x: 0-1, y: 0-1 }, default center
• useHardwareLayer — Android GPU optimization (boolean, default false)

Important Constraints

• Loop requires timing (not spring) and initialAnimate must define the start value
• No per-property transitions — one transition config applies to all animated properties
• No animation sequencing — no equivalent to withSequence/withDelay
• No gesture/scroll-driven animations — EaseView is state-driven only
• Style/animate conflict — if a property appears in both style and animate, the animated value wins