How to use with React Native & Expo? #235

duggster · 2022-03-19T21:54:05Z

I have used wdyr with my RN Expo app in the past, maybe a year ago, but now it is not showing anything in the logs. Any help would be greatly appreciated!

I created a new RN Expo app to use as a simplistic, reproducible example:
expo init wdyr-test
and choose option for blank project (managed workflow).

App.js

import './wdyr'; // <--- first import

import React, { useState } from 'react';
import { StyleSheet, Text, View, Button } from 'react-native';

export default function App() {

  const [count, setCount] = useState(0);

  const onPress = () => {
    console.log("Increment Pressed");
    setCount(prev => prev + 1);
  }

  console.log("App RENDER");

  return (
    <View style={styles.container}>

      <Text>{count}</Text>
      <Button title="Increment" onPress={onPress} />

      <Subcomponent style={{ height: 100, width: 100, borderRadius: 50, backgroundColor: "blue" }} />

    </View>
  );
}

const Subcomponent = React.memo(({ style }) => {

  console.log("Subcomponent RENDER");

  return (
    <View style={style} />
  )
});
Subcomponent.whyDidYouRender = true;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
    margin: 50
  },
});

wdyr.js

import React from 'react';

if (__DEV__) {
  const whyDidYouRender = require('@welldone-software/why-did-you-render');
  whyDidYouRender(React, {
    trackAllPureComponents: true,
  });
}

package.json

{
  "name": "wdyr-test",
  "version": "1.0.0",
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "web": "expo start --web",
    "eject": "expo eject"
  },
  "dependencies": {
    "expo": "~44.0.0",
    "expo-status-bar": "~1.2.0",
    "react": "17.0.1",
    "react-dom": "17.0.1",
    "react-native": "0.64.3",
    "react-native-web": "0.17.1"
  },
  "devDependencies": {
    "@babel/core": "^7.12.9",
    "@welldone-software/why-did-you-render": "^6.2.3"
  },
  "private": true
}

I don't know much (anything) about babel so just tried this for my bable.config.js but there was no change:

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

  const isDev = process.env.BABEL_ENV === "development";

  return {
    presets: [
      ['babel-preset-expo',
        {
          jsxRuntime: 'automatic',
          jsxImportSource: isDev ? '@welldone-software/why-did-you-render' : 'react'
        }
      ]
    ],
  };
};

All I get is this in the logs:

App RENDER
Subcomponent RENDER
Increment Pressed
App RENDER
Subcomponent RENDER
Increment Pressed
App RENDER
Subcomponent RENDER

The text was updated successfully, but these errors were encountered:

mariomurrent-softwaresolutions · 2022-03-22T17:11:03Z

Same here - any solution yet?

zeevl · 2022-03-29T20:16:19Z

I don't know about expo, but this was super helpful for me (and no, I'm not the author :))
https://yajanarao.medium.com/how-to-use-why-did-you-render-library-in-react-native-a95121978a75

duggster · 2022-03-30T18:02:05Z

@zeevl Thanks for trying to help but It looks like this article basically just copies the installation and setup instructions from the main wdyr github page, though with less information. It also links to issue #58 here which doesn't have any resolution or workarounds mentioned in it. Let me know though if I missed anything specific that you were thinking might help.

zeevl · 2022-03-30T20:37:32Z

@duggster the main wdyr readme was has a lot of extra and misleading information that isn't applicable to get it working in RN. I got it working quickly by following the instructions in the linked post, but ymmv. Sounds like what you're running into may be specific to expo?

duggster · 2022-03-30T22:13:10Z

If it's working for others on plain RN than chances are it is something with Expo involved (I've only ever used Expo, so I haven't tested other RN approaches). I also saw another issue #231 which is still open and I'm wondering if it has something to do with React 17.0.1 since the latest Expo also uses 17.0.1?

vzaidman · 2022-04-02T20:40:27Z

If it's working for others on plain RN than chances are it is something with Expo involved (I've only ever used Expo, so I haven't tested other RN approaches). I also saw another issue #231 which is still open and I'm wondering if it has something to do with React 17.0.1 since the latest Expo also uses 17.0.1?

This issue has to do with CRA5 and not React 17.0.1.

I can't help with this one since I don't know anything about Expo.

palicko · 2022-05-18T10:00:41Z

Had the same problem, WDYR stopped working in Expo 44.
As answers above suggested, it was probably because of React 17 and CRA.

All I had to do is to add another preset to my babel.config.js, like this:

presets: [
  'babel-preset-expo',
  [
    '@babel/preset-react',
    {
      importSource: '@welldone-software/why-did-you-render',
      runtime: 'automatic',
      development: process.env.NODE_ENV === 'development' || false,
    },
  ],
],

Edit: also make sure you have @babel/preset-react package installed.

duggster · 2022-05-19T12:29:12Z

Hi @palicko I tried this and got the following error trying to run my expo app:
Error: Cannot find module '@babel/preset-react'

How do I get this to work with expo?

palicko · 2022-05-19T15:47:34Z

@duggster it seems you don't have @babel/preset-react present in your packages.
Install it with yarn (or npm), like this yarn add @babel/preset-react --dev

duggster · 2022-05-19T18:21:20Z

Thanks, got it installed and tried running it again but to no avail. I'm still only getting the normal log outputs same as my original post, nothing from wdyr. Anything else you can think of I might be missing? Are you able to post any relevant files that might have some difference to what I have in them?

Here is my updated wdyr.js and babel.config.js files (the other files in my project are still the same as my first post). I also tried removing the check for __DEV__ just to make sure that wasn't skipping the require( ) unexpectedly. I also upgraded expo to SDK45 and wdyr to 7.0.1.

wdyr.js

import React from 'react';

const whyDidYouRender = require('@welldone-software/why-did-you-render');
whyDidYouRender(React, {
  trackAllPureComponents: true,
});

babel.config.js

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

  return {
    presets: [
      'babel-preset-expo',
      [
        '@babel/preset-react',
        {
          importSource: '@welldone-software/why-did-you-render',
          runtime: 'automatic',
        },
      ],
    ],
  };
};

package.json

{
  "name": "wdyr-test",
  "version": "1.0.0",
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "web": "expo start --web",
    "eject": "expo eject"
  },
  "dependencies": {
    "expo": "^45.0.0",
    "expo-status-bar": "~1.3.0",
    "react": "17.0.2",
    "react-dom": "17.0.2",
    "react-native": "0.68.2",
    "react-native-web": "0.17.7"
  },
  "devDependencies": {
    "@babel/core": "^7.12.9",
    "@babel/preset-react": "^7.17.12",
    "@welldone-software/why-did-you-render": "^7.0.1"
  },
  "private": true
}

palicko · 2022-05-20T17:43:17Z

@duggster yes, forgot to add development parameter as well. I edited my previous post.

duggster · 2022-05-20T18:13:42Z

Thanks @palicko , I added that however I'm still not getting any wdyr log output. I confirmed my expo project is running in Development mode.

babel.config.js

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

  return {
    presets: [
      'babel-preset-expo',
      [
        '@babel/preset-react',
        {
          importSource: '@welldone-software/why-did-you-render',
          runtime: 'automatic',
          development: process.env.NODE_ENV === 'development' || false,
        },
      ],
    ],
  };
};

logs:

iOS Bundling complete 2353ms
iOS Running app on Laptop
App RENDER
Subcomponent RENDER
Increment Pressed
App RENDER
Subcomponent RENDER
Increment Pressed
App RENDER
Subcomponent RENDER
Increment Pressed
App RENDER
Subcomponent RENDER

I'm expecting for wdyr to log that Subcomponent is re-rendering unnecessarily due to its style prop.

palicko · 2022-05-20T18:57:23Z

@duggster I did the exact steps you described and created new project with same files as you have. Everything is working fine and I get this in my console:

Increment Pressed
App RENDER
_c2
Object {
  "_c2": [Function _c2],
} Re-rendered because of props changes:
props.style
different objects that are equal by value. (more info at http://bit.ly/wdyr02)
Object {
  "prev style": Object {
    "backgroundColor": "blue",
    "borderRadius": 50,
    "height": 100,
    "width": 100,
  },
} !== Object {
  "next style": Object {
    "backgroundColor": "blue",
    "borderRadius": 50,
    "height": 100,
    "width": 100,
  },
}
Object {
  "For detailed diff, right click the following fn, save as global, and run: ": [Function diffFn],
}
Subcomponent RENDER

Maybe try to clear Expo cache?

duggster · 2022-05-21T01:46:53Z

@palicko thanks for confirming it works with expo at least, must be something unique to me going on here. Still not working for me even after clearing expo cache, and I tried deleting node_modules too. Next I will try starting from scratch again with another new project and will report back if it works.

zagoorland · 2022-09-08T09:18:08Z

These solutions also are not working for me on Expo 46 :/

DarWiM · 2022-09-16T14:13:06Z

Works for me on Expo 46
npx cross-env NODE_ENV=development expo start -c

mrzmyr · 2022-10-11T19:48:16Z

@palicko actually got it working by clearing the cache as well.

Expo SDK Version 46

yarn install --dev @babel/preset-react @welldone-software/why-did-you-render

package.json

"main": "node_modules/expo/AppEntry.js",

babel.config.js

module.exports = function (api) {
  api.cache(true);
  return {
    presets: [
      "babel-preset-expo",
      [
        '@babel/preset-react',
        {
          importSource: '@welldone-software/why-did-you-render',
          runtime: 'automatic',
          development: true,
        },
      ],
    ],
    plugins: ["react-native-reanimated/plugin"],
  };
};

wdyr.js

import React from 'react';

if(__DEV__) {
  const whyDidYouRender = require('@welldone-software/why-did-you-render');
  whyDidYouRender(React, {
    trackAllPureComponents: true,
  });

  console.log('whyDidYouRender enabled');
}

App.tsx

import './wdyr.js'
import { StatusBar } from 'expo-status-bar';
import { View } from 'react-native';
import useCachedResources from './hooks/useCachedResources';
import Navigation from './navigation';

export default function App() {
  const isLoadingComplete = useCachedResources();
  
  if (!isLoadingComplete) {
    return null;
  } else {
    return (
      <View style={{ flex: 1 }}>
        <Navigation />
        <StatusBar />
      </View>
    );
  }
}

Run expo with clearing the cache beforehand:

expo start -c

Nantris · 2022-10-26T21:41:56Z

@mrzmyr with what Expo SDK version?

I've spent hours trying to make this work. It doesn't work. I've created an issue on the Expo issue tracker: expo/expo#19709

mrzmyr · 2022-10-26T21:46:51Z

@slapbox Version is SDK 46

Nantris · 2022-10-26T21:49:01Z

Utterly baffling. I tried three separate projects, dozens of configs, and not one of them worked. @mrzmyr can you share the main field in your package.json - if you have one?

Edit: @#$%ing StrictMode. Turn it off.

mrzmyr · 2022-10-27T10:18:16Z

@slapbox

package.json

"main": "node_modules/expo/AppEntry.js",

bayramn · 2022-12-04T17:48:03Z

Hey guys, it stopped working all of sudden and just can't make it work anymore. Anyone can give a guidance to resolve this? I am on Expo SDK 46 on development built.

RicardoBrito1938 · 2023-01-20T14:23:30Z

  const isLoadingComplete = useCachedResources();

Just to let everyone aware, it works on SDK 47 too

henkaumio · 2023-05-10T08:00:02Z

Cant get WDYR to work/log anything in Expo 48. Followed all the steps above.

export const Screen = () => {
  const [toggle, settoggle] = useState(false);
  return (
    <Page>
      <DefaultButtonSelectableTextFullWidth
        onPress={() => settoggle(!toggle)}
        selectState={toggle ? 'selected' : 'unselected'}
        title="toggle"
      />
      <TestWDYR style={{ height: 50 }} />
      <__________v48 />
    </Page>
  );
};

const TestWDYR = ({ style }: { style: ViewStyle }) => {
  console.log('renderrred');
  return <View style={style} />;
};

TestWDYR.whyDidYouRender = true;

felixSchl · 2023-05-21T06:19:31Z

@henkaumio if you copy and pasted from above solutions, be sure to set NODE_ENV=development or change the babel.config.js to set development: true to confirm that's the problem.

ErionTp · 2023-09-02T18:51:46Z

Maybe try npx cross-env NODE_ENV=development expo start -c

MCervenka · 2023-11-21T18:49:11Z

i just changes wdyr.js as this and got it working in expo 49:
if (__DEV__) { const whyDidYouRender = require('@welldone-software/why-did-you-render'); whyDidYouRender(React, { trackAllPureComponents: true, }); }

but it was showing me only one component rerendering. I fixed it, but the component that is all the time console.logging was not shown in wdyr

antoinegrelard · 2024-02-19T16:45:58Z

Hey all!

I've been playing around with the lib and try to figure out why I was unable to get it working as well.

I've ended up finding a solution that works for me and that will hopefully fix it for you all as well!

In my case I use:

Expo (v50)
babel-preset-expo (v10)
wdyr (v8)

What I noticed by digging in the babel-preset-expo code is that they already use the @babel/preset-react preset there, and you can pass params to it.

Here's what my babel.config.js file looks like:

module.exports = function (api) {
  api.cache(true);
  return {
    presets: [
      [
        "babel-preset-expo",
        {
          jsxImportSource: "@welldone-software/why-did-you-render",
        },
      ],
    ],
    plugins: [
      ["babel-plugin-react-docgen-typescript", { exclude: "node_modules" }],
      "react-native-reanimated/plugin",
    ],
  };
};

Notice how here I pass the importSource as jsxImportSource to babel-preset-expo directly.

With that done, I started expo (expo start -c) and I can now see all the logs that I need!

Hope this helps anyone who comes across the issue again!

vzaidman added the help wanted Extra attention is needed label Apr 2, 2022

Nantris mentioned this issue Oct 26, 2022

No longer works with @welldone-software/why-did-you-render expo/expo#19709

Closed

chrisnojima mentioned this issue Dec 18, 2022

[react-native + automatic jsx transform] RangeError: Maximum call stack size exceeded #222

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How to use with React Native & Expo? #235

How to use with React Native & Expo? #235

duggster commented Mar 19, 2022

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mrzmyr commented Oct 27, 2022

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RicardoBrito1938 commented Jan 20, 2023

henkaumio commented May 10, 2023 •

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felixSchl commented May 21, 2023

ErionTp commented Sep 2, 2023

MCervenka commented Nov 21, 2023

antoinegrelard commented Feb 19, 2024

How to use with React Native & Expo? #235

How to use with React Native & Expo? #235

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duggster commented Mar 19, 2022

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