Questions tagged [expo]
Expo is an open-source and free platform that lets web developers build truly native apps that work across both iOS and Android by writing them once in just JavaScript. Use the Expo tag on questions about developing Expo projects and using the Expo development tools like XDE and exp.
16,522
questions
15
votes
2
answers
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Expo Firebase Authentication "While trying to resolve module `idb` from file"
This is my first app. I'm trying to use Firebase for Email/Password authentication. I followed the basic tutorial https://firebase.google.com/docs/auth/web/password-auth#web-version-9, and I keep ...
- 165
15
votes
3
answers
6k
views
Dark Mode: useColorScheme() always returns light on Android
I am trying to get Dark Mode to work and it doesn't work on Android. It always returns "light". On iOS it works fine.
import React from 'react';
import { useColorScheme } from "react-...
- 1,218
15
votes
6
answers
32k
views
Application main has not been registered
I have recently started to convert my react native app and running on Expo so i could test this on my actual android device. I am getting this error above. I have since then running my app using the ...
- 581
15
votes
3
answers
10k
views
Change border color of TextInput when focused in react-native-web (expo)
In the last versions of Expo there is a Web support. In the picture you see a normal TextInput created with React Native & rendered in the Web.
How can I change the color of the TextInput Border ...
- 2,332
15
votes
2
answers
17k
views
react-native-image-picker vs expo ImagePicker
I have tried many attempts to get react-native-image-picker up and working with my RN app. I am using Expo and VS Code and am not running the app with Xcode or Android Studio. There seems to be many ...
- 2,033
15
votes
10
answers
20k
views
Tunnel URL not found, falled back to LAN URL
How do I run my expo app using the tunnel? It worked last week but for the last 3 days, it stopped working.
Code written: expo start --tunnel
Methods I tried:
I used 3 different networks. One using ...
15
votes
8
answers
110k
views
How to fire componentDidMount() or useEffect Hook on every visit to a page/screen?
So I have an app with an activity. The app checks for Internet connection at the beginning. If there are no Internet connection, it will show a screen with a button to refresh the page. The problem is ...
- 319
15
votes
1
answer
5k
views
Delay on the capture of an image - React Native Camera / Expo Camera
I am trying to realize the same functionnality as in Facebook or Instagram:
Preview the image taken by the camera instantly
At this point, my taken is correctly taken when this function is called :
...
- 1,667
15
votes
6
answers
9k
views
Deep linking - doesn't work if app is closed
I'm implementing deep linking with expo in my react native app. I've managed to do it using this code with this tutorial and this documentation for adjusting it to my nested stacks:
const linking = {
...
- 40.4k
15
votes
0
answers
4k
views
React Native TextInput Error: perform input operation requires a valid sessionID
I have a React Native project using the Expo managed workflow with Prebuild.
I'm simply rendering a TextInput component and I am receiving this error:
[RemoteTextInput] -[RTIInputSystemClient
...
- 2,720
15
votes
0
answers
4k
views
Disconnected from the Metro server. Reload to reconnect
Using RN with Expo, I've started getting the Disconnected from the Metro server. Reload to reconnect error to appear pretty much every time after hitting Save.
I found this - https://github.com/...
- 193
14
votes
7
answers
11k
views
npm install -g expo-cli fails with "EPERM: operation not permitted, unlink '...\adb.exe'
I receive an error when running
$ npm install -g expo-cli
I have tried reinstalling the node modules as An Administrator but the same error occurs.
Environment:
Windows 10,
Node Version: 10.15.3,
...
- 482
14
votes
3
answers
10k
views
Rebuilding expo bundle with a different slug
I changed the name of a React Native/Expo app and wanted to change the slug to go with it, but got the error "CombinedError: [GraphQL] Experience with name '@-----/newName' does not exist". ...
- 147
14
votes
31
answers
90k
views
Can't run "npm install expo-cli --global"
I am a newbie in all this stuff. Hope for your understanding.
Let me clarify the issue:
I am trying to start react native app through expo cli. So tried to start npm install expo-cli --global to ...
14
votes
5
answers
17k
views
Expo Error on launching the app. "ApiV2Error: Account not found. "
Good day,
I am using and expo version 5.4.12
I tried running my app I got an error on launch
"ApiV2Error: Account not found.
at ApiV2Client._requestAsync"
anyone who had this issue ? ...
- 435
14
votes
4
answers
22k
views
Expo Error starting tunnel Failed to install @expo/ngrok@^2.4.3 globally
I'm trying to run expo with a tunnel connection and I keep getting the following error:
Error starting tunnel Failed to install @expo/ngrok@^2.4.3 globally: npm exited with non-zero code: 243
I've ...
- 221
14
votes
1
answer
24k
views
How to use older version of Expo with the mobile app?
i have a project using expo version 30.0.1 i don't want that to change the app was created using CRNA when i try to run npm start and i choose ios or android the expo mobile app on the simulator ...
- 735
14
votes
2
answers
17k
views
How to save image to Camera Roll using Expo?
I'm creating an app using Expo to take picture, I'm already possible to save pictures to FileSystem.documentDirectory, but this is not what I want.
I tried to save image to Camera Roll using code ...
- 8,438
14
votes
8
answers
18k
views
Admob : Ad serving is limited - The number of ads you can show has been limited. For details, go to the Policy center
I'm new to admob. I published my first android app (written in expo react-native). I followed the instructions https://docs.expo.dev/versions/latest/sdk/admob/ on including admob ads in my app. But ...
- 6,485
14
votes
5
answers
34k
views
React Native Expo Environment Variables
So I'm happy with the concept of environment variables as explained in this article and others
https://www.freecodecamp.org/news/how-to-gracefully-use-environment-variables-in-a-react-native-app/
...
- 527
14
votes
5
answers
16k
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Expo : cannot find a module LogReporter
I have created a React Native Project and I was trying to open that project in Expo XDE. It throws the following error:
Cannot find module ...\node_modules\expo\tools\LogReporter
Firstly I ...
- 890
14
votes
4
answers
9k
views
Unable to get started with a new Expo project | Node.js version 14.0.0 is no longer supported
I am just getting started with Expo and trying to create my first project. I installed Node.js (v14.0.0) via Homebrew, and installed installed expo-cli using npm by running the following command as ...
- 1,640
14
votes
4
answers
10k
views
How do I use react-native-google-mobile-ads with Expo and Expo Go?
How do I use react-native-google-mobile-ads with Expo and Expo Go? (e.g. Banner Ads)
A minimal example within the context of Expo would be very much appreciated.
All the online google documentation as ...
- 13k
14
votes
5
answers
6k
views
Prevent Require Cycle warnings on terminal
I'm continuously getting Require cycles are allowed, but can result in uninitialized values. Consider refactoring to remove the need for a cycle. warning on my terminal and it has make debugging my ...
- 6,993
14
votes
3
answers
20k
views
class was expected (declaration of 'com.google.android.gms.location.FusedLocationProviderClient') in react native
This was working fine earlier.
Possible Unhandled Promise Rejection (id: 0):
Error: Encountered an exception while calling native method: Exception occurred while executing exported method ...
- 151
14
votes
1
answer
7k
views
React-Native expo POST Blob
I'm using react native with expo and I'm trying to POST a blob image through fetch api. I'm using form-data format for the body and i have the next code:
const blob = await response.blob()
...
- 735
14
votes
3
answers
11k
views
differences between create-react-native-app and exp init
I found that create-react-native-app is based on expo. but when using exp-cli, it is also based on Expo.
what are differences between create-react-native-app and exp init ?
- 143
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votes
5
answers
15k
views
React Native local images load slowly
I'm building an app using React Native with Expo. Everything works fine except the images, they load correctly but it takes about 2 seconds to load, and it's weird because all the images are local ...
- 425
14
votes
4
answers
12k
views
No native ExponentConstants module found, are you sure the expo-constants's module is linked properly?
I'm getting these warnings when I run my expo / jest project and I'm not sure why, seemed to not come up when googled.
console.warn
The "EXNativeModulesProxy" native module is not ...
- 58.1k
14
votes
2
answers
10k
views
Expo Web failed to compile "optional chaining"
Looks like Expo Webpack doesn't optional chaining.
I found this when I tried to install UI Kitten to Expo Web app.
This is the compile error after I added UI Kitten to the newly created Expo app
...
- 181
14
votes
1
answer
670
views
Error : Cannot read property fetch. Using jest-expo with react native
TypeError: Cannot read property 'fetch' of undefined
at node_modules/whatwg-fetch/fetch.js:4:8
at Object.<anonymous> (node_modules/whatwg-fetch/fetch.js:466:3)
at Object.<anonymous> ...
- 1,256
14
votes
2
answers
9k
views
Expo cannot open development build on android emulator
I'm trying to run my Expo managed project on Android simulator with npx expo run:android.
I have expo-dev-client installed.
When I run npx expo run:android, it fails with the message:
CommandError: ...
- 864
13
votes
4
answers
48k
views
How to use google reverse geocoding with react native Expo?
I want to put in my application a button that when pressed return the current address of the cell phone.
The latitude and longitude I am able to return correctly, and to convert this data into an ...
- 518
13
votes
5
answers
26k
views
React Native Expo - Node.js version 11.13.0 is no longer supported
I'm using Expo with React Native but when trying to create a new project I get the error:
ERROR: Node.js version 11.13.0 is no longer supported.
expo-cli supports following Node.js versions:
* >=...
- 12.2k
13
votes
3
answers
14k
views
Can't debug expo project on vscode
I have an expo project, which we can run and build and it works correctly in android and iOS. What I want is to debug said project using my Visual Studio Code.
I followed some guides and tried the ...
- 163
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votes
2
answers
12k
views
React native Expo Version code 1 has already been used. Try another version code
After updating my app I am trying to upload my expo app to the playstore but getting error again and again. I changed the version in app.json version": "2.0.0" and also try this version&...
- 967
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votes
12
answers
39k
views
I am trying to install eas cli and am getting the error: zsh: command not found: eas
I am in the root folder and type:
yarn global add eas-cli
I then get:
yarn global v1.22.19
warning ../../package.json: No license field
[1/4] 🔍 Resolving packages...
[2/4] 🚚 Fetching packages...
[...
- 185
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votes
4
answers
18k
views
Can't run 'expo start' on a expo-react-native app, permission problem
Well, i see that already have many questions related to my problem on this site, but i also see that NONE of the solutions work for my specific case, because of that, i am opening that question, so it ...
- 3,187
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votes
2
answers
7k
views
I can't run my expo project since I updated expo-sdk
When I try to run my expo project I get this message:
D:\React\myproject>npm start
> start
> expo start
Starting project at D:\React\myproject
Unable to find expo in this project - have you run yarn ...
- 131
13
votes
4
answers
9k
views
How to use @expo/vector-icons dynamically through props in typescript react native app?
react native app with typescript and I'm trying to create icon button that uses @expo/vector-icons with Fontawesome or MaterialIcon dynamically by trying to pass a name as a string via props.
I think ...
- 135
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votes
7
answers
27k
views
"Error: Cannot find module 'metro-core'" when starting an Expo project
Whenever I start Expo Go with the expo start command, this error appears :
Error: Cannot find module 'metro-core'
Require stack:
- /usr/local/lib/node_modules/expo/node_modules/@expo/cli/build/src/...
- 191
13
votes
5
answers
19k
views
How to check for an internet connection in an Expo React Native app?
I have an Expo app using the Managed workflow. The app needs to check whether an internet connection is available.
I can't import { NetInfo } from 'react-native' because that's deprecated.
I can't ...
- 1,543
13
votes
3
answers
25k
views
How do you set default `CONNECTION` to `tunnel` with Expo?
When running expo ios, the default connection type is LAN. Via app.json, metro.config.js, or .env, how does one configure type tunnel to be the default?
- 8,959
13
votes
3
answers
17k
views
Suddenly seeing error "Plugin/Preset files are not allowed to export objects, only functions" in create-react-native-app project
Have been working on a project generated via create-react-native-app. Have been successfully using the project for some time, but now trying to test the app via exp start --tunnel, am suddenly seeing ...
- 4,129
13
votes
3
answers
16k
views
Promise allSettled is not a function
I planned updating some Promise.all to Promise.allSettled in my React Native - Expo Project but the function does not Exist. i checked all Versions and everything fits but i still cant use the ...
- 337
13
votes
1
answer
5k
views
React Navigation v6 NavigationContainer linking attribute with nested navigation typescript issue
I am using react navigation 6 with a root stack navigator containing a tab navigator. My linking attribute config looks like this in the App component:
export default function App() {
const ...
- 1,197
13
votes
4
answers
15k
views
View or open PDF files stored locally Expo React Native
Is there a solution to view or open PDF Files using Expo (without Expo eject)?
It's not necessary to open file inside App, it's can be a local filemanager.
What i tried:
Linking does not open ...
user12532331
13
votes
3
answers
11k
views
Create an expo project with a specific version
How do you specify the expo version when creating a project? Such as in React Native you can just add the version in the command like this react-native init projectName [email protected]
What about in ...
- 918
13
votes
16
answers
13k
views
New update available on Expo, infinite downloading
I'm new to developping with Expo. That new that I haven't started developping yet because of an issue.
I followed a tutorial which shows how to use Expo to see how our app is doing. (https://...
13
votes
1
answer
42k
views
Why React-Native Couldn't start project on Android connection with Expo?
Couldn't start project on Android.
Error : No Android connected device found, and no emulators could be started automatically.
Please connect a device or create an emulator (https://docs.expo.io/...
- 131