moti requires expo-linear-gradient when im using react native cli only without expo @nandorojo

[husam868maher]

Is there an existing issue for this?

• I have searched the existing issues

Do you want this issue prioritized?

• Yes, I have sponsored
• Not urgent

Current Behavior

getting this weird error while trying to use moti with react native only

my package json contains these packages

"react-native-reanimated": "^3.6.1",
"react-native": "0.72.7",
"moti": "^0.27.2",

Expected Behavior

getting this weird error while trying to use moti with react native only

my package json contains these packages

"react-native-reanimated": "^3.6.1",
"react-native": "0.72.7",
"moti": "^0.27.2",

Steps To Reproduce

create new react native project with npx react-native init project
install moti package
instal reanimated package
use in in the code

Versions

"react-native-reanimated": "^3.6.1",
    "react-native": "0.72.7",
    "moti": "^0.27.2",

Screenshots

Reproduction

npx create-react-native-app -t with-moti

[yamak-app]

@husam868maher @nandorojo same here any fix for this ?

[nandorojo]

Did you use the non-expo approach from the skeleton on docs?

https://moti.fyi/skeleton#non-expo-users

[VladyslavMartynov10]

Hey @nandorojo!

Recently I've also tried to use Skeleton component with react-native-cli & react-native-lineal-gradient but got the same error as @yamak-app

[nandorojo]

Seems like your Babel plugin isn't working

[nandorojo]

You added the module resolver one from the docs?

[VladyslavMartynov10]

Hi @nandorojo !

Thanks again for such great package for animations. I've resolved
the problem for react-native cli by using this small patch changes:

moti+0.27.2.patch

[nandorojo]

Can you please send the code inline?

[VladyslavMartynov10]

expo.tsx file:

import { LinearGradient } from 'react-native-linear-gradient'
import React from 'react'

import SkeletonNative from './skeleton-new'
import { MotiSkeletonProps } from './types'

export default function SkeletonExpo(
  props: Omit<MotiSkeletonProps, 'Gradient'>
) {
  return <SkeletonNative {...props} Gradient={LinearGradient as any} />
}

SkeletonExpo.Group = SkeletonNative.Group

skeleton.tsx:

import { LinearGradient } from 'react-native-linear-gradient'
import React, { useState, createContext, useContext } from 'react'
import { View, StyleSheet } from 'react-native'

import { View as MotiView } from '../components'
import { AnimatePresence, MotiTransitionProp } from '../core'
import {
  DEFAULT_SKELETON_SIZE as DEFAULT_SIZE,
  defaultDarkColors,
  defaultLightColors,
  baseColors,
} from './shared'
import { MotiSkeletonProps } from './types'

export default function Skeleton(props: MotiSkeletonProps) {
  const skeletonGroupContext = useContext(SkeletonGroupContext)
  const {
    radius = 8,
    children,
    show = skeletonGroupContext ?? !children,
    width,
    height = children ? undefined : DEFAULT_SIZE,
    boxHeight,
    colorMode = 'dark',
    colors = colorMode === 'dark' ? defaultDarkColors : defaultLightColors,
    backgroundColor = colors[0] ??
      colors[1] ??
      baseColors[colorMode]?.secondary,
    backgroundSize = 6,
    disableExitAnimation,
    transition,
  } = props

  const [measuredWidth, setMeasuredWidth] = useState(0)

  const getBorderRadius = () => {
    if (radius === 'square') {
      return 0
    }
    if (radius === 'round') {
      return 99999
    }
    return radius
  }

  const borderRadius = getBorderRadius()

  const getOuterHeight = () => {
    if (boxHeight != null) return boxHeight
    if (show && !children) {
      return height
    }
    return undefined
  }

  const outerHeight = getOuterHeight()

  return (
    <View
      style={{
        height: outerHeight,
        minHeight: height,
        minWidth: width ?? (children ? undefined : DEFAULT_SIZE),
      }}
    >
      {children}
      <AnimatePresence>
        {show && (
          <MotiView
            style={{
              position: 'absolute',
              top: 0,
              left: 0,
              borderRadius,
              width: width ?? (children ? '100%' : DEFAULT_SIZE),
              height: height ?? '100%',
              overflow: 'hidden',
            }}
            animate={{
              backgroundColor,
              opacity: 1,
            }}
            transition={{
              type: 'timing',
            }}
            exit={
              !disableExitAnimation && {
                opacity: 0,
              }
            }
            onLayout={({ nativeEvent }) => {
              if (measuredWidth === nativeEvent.layout.width) return

              setMeasuredWidth(nativeEvent.layout.width)
            }}
            pointerEvents="none"
          >
            <AnimatedGradient
              // force a key change to make the loop animation re-mount
              key={`${JSON.stringify(colors)}-${measuredWidth}-${JSON.stringify(
                transition || null
              )}`}
              colors={colors}
              backgroundSize={backgroundSize}
              measuredWidth={measuredWidth}
              transition={transition}
            />
          </MotiView>
        )}
      </AnimatePresence>
    </View>
  )
}

const AnimatedGradient = React.memo(
  function AnimatedGradient({
    measuredWidth,
    colors,
    backgroundSize,
    transition = {},
  }: {
    measuredWidth: number
    colors: string[]
    backgroundSize: number
    transition?: MotiTransitionProp
  }) {
    return (
      <MotiView
        style={StyleSheet.absoluteFillObject}
        from={{ opacity: 0 }}
        transition={{
          type: 'timing',
          duration: 200,
        }}
        animate={
          measuredWidth
            ? {
                opacity: 1,
              }
            : undefined
        }
      >
        <MotiView
          style={[
            StyleSheet.absoluteFillObject,
            {
              width: measuredWidth * backgroundSize,
            },
          ]}
          from={{
            translateX: 0,
          }}
          animate={
            measuredWidth
              ? {
                  translateX: -measuredWidth * (backgroundSize - 1),
                }
              : undefined
          }
          transition={{
            loop: true,
            delay: 200,
            type: 'timing',
            duration: 3000,
            ...(transition as any),
          }}
        >
          <LinearGradient
            colors={colors}
            start={{
              x: 0.1,
              y: 1,
            }}
            end={{
              x: 1,
              y: 1,
            }}
            style={StyleSheet.absoluteFillObject}
          />
        </MotiView>
      </MotiView>
    )
  },
  function propsAreEqual(prev, next) {
    if (prev.measuredWidth !== next.measuredWidth) return false

    if (prev.backgroundSize !== next.backgroundSize) return false

    const didColorsChange = prev.colors.some((color, index) => {
      return color !== next.colors[index]
    })

    if (didColorsChange) return false

    // transition changes will not be respected, but it'll be in the key
    return true
  }
)

const SkeletonGroupContext = createContext<boolean | undefined>(undefined)

function SkeletonGroup({
  children,
  show,
}: {
  children: React.ReactNode
  /**
   * If `true`, all `Skeleton` children components will be shown.
   *
   * If `false`, the `Skeleton` children will be hidden.
   */
  show: boolean
}) {
  return (
    <SkeletonGroupContext.Provider value={show}>
      {children}
    </SkeletonGroupContext.Provider>
  )
}

Skeleton.Group = SkeletonGroup

The only important change here is this new import { LinearGradient } from 'react-native-linear-gradient' instead of expo-linear-gradient.

babel.config.js:

module.exports = function (api) {
  api.cache(true);

 return {
  presets: ['module:metro-react-native-babel-preset'],
  plugins: [
    'react-native-reanimated/plugin',
    [
      'babel-plugin-module-resolver',
      {
        root: ['./src/'],
        alias: [
          { 'moti/skeleton': 'moti/skeleton/react-native-linear-gradient' },
        ],
        extensions: ['.js', '.jsx', '.ts', '.tsx'],
      },
    ],
  ],
  };
};

[VladyslavMartynov10]

I didn't properly tested it with other RN versions. In my case it's working like a charm for both Android/iOS "react-native": "0.72.7"

[VladyslavMartynov10]

@nandorojo Let me know if it's working on your side?

By the way, maybe it's better to override this react-native-linear-gradient/expo-linear-gradient dependency directly in json with "overrides" or something similar to it. What do you think?

[nandorojo]

Please send the patch file inline

What's wrong with the current docs for the skeleton using the Babel plugin? Doesn't it do this for you?

[VladyslavMartynov10]

diff --git a/node_modules/moti/src/skeleton/expo.tsx b/node_modules/moti/src/skeleton/expo.tsx
index 1674b89..083824c 100644
--- a/node_modules/moti/src/skeleton/expo.tsx
+++ b/node_modules/moti/src/skeleton/expo.tsx
@@ -1,4 +1,4 @@
-import { LinearGradient } from 'expo-linear-gradient'
+import { LinearGradient } from 'react-native-linear-gradient'
 import React from 'react'
 
 import SkeletonNative from './skeleton-new'
diff --git a/node_modules/moti/src/skeleton/skeleton.tsx b/node_modules/moti/src/skeleton/skeleton.tsx
index 3ef5dd1..0e3bed3 100644
--- a/node_modules/moti/src/skeleton/skeleton.tsx
+++ b/node_modules/moti/src/skeleton/skeleton.tsx
@@ -1,4 +1,4 @@
-import { LinearGradient } from 'expo-linear-gradient'
+import { LinearGradient } from 'react-native-linear-gradient'
 import React, { useState, createContext, useContext } from 'react'
 import { View, StyleSheet } from 'react-native'
 
diff --git a/node_modules/moti/src/skeleton/types.ts b/node_modules/moti/src/skeleton/types.ts
index 7fa9d78..176f224 100644
--- a/node_modules/moti/src/skeleton/types.ts
+++ b/node_modules/moti/src/skeleton/types.ts
@@ -1,4 +1,4 @@
-import { LinearGradient } from 'expo-linear-gradient'
+import { LinearGradient } from 'react-native-linear-gradient'
 import { MotiTransitionProp } from '../core'
 import { baseColors } from './shared'

babel-plugin is working as expected now. Before, I had some troubles with changing babel.config.js.

[falegreg]

Same problem here, I tried with the same patch but it's still not working. Any updates?

[Mghendi-Pato]

This solution worked for me using React Native CLI:

Install react-native-linear-gradient:
npm install react-native-linear-gradient

Replace all instances of:
import { LinearGradient } from 'expo-linear-gradient'
with:
import { LinearGradient } from 'react-native-linear-gradient'

Files where the change is needed:

• node_modules/moti/src/skeleton/expo.tsx
• node_modules/moti/src/skeleton/skeleton.tsx
• node_modules/moti/src/skeleton/types.ts
• node_modules/moti/build/skeleton/expo.js

This should resolve the issue when using React Native CLI instead of Expo.