I am on MacOS Big Sur with Xcode v12.4. After creating a new Expo project and immediately running npx expo run:ios, I receive a compilation error as shown below. My project directory has no spaces or special characters in the path (which was a cause reported in certain Stack Overflow posts).
I was expecting a freshly-generated project like this to run:ios without error. Does anyone have any idea why this error occurs? Thanks in advance.
$ npx create-expo-app my-react-app
✔ Downloaded and extracted project files.
✔ Installed JavaScript dependencies.
✅ Your project is ready!
To run your project, navigate to the directory and run one of the following npm commands.
- cd my-react-app
- npm run android
- npm run ios
- npm run web
$ cd my-react-app
$ npx expo run:ios
📝 iOS Bundle Identifier Learn more: https://expo.fyi/bundle-identifier
✔ What would you like your iOS bundle identifier to be? … com.dummybundle.my-react-app
✔ Created native project | gitignore skipped
✔ Added Metro config
✔ Updated package.json and added index.js entry point for iOS and Android
› Removed "main": "node_modules/expo/AppEntry.js" from package.json because we recommend using index.js as main instead
› Installing using npm
Using node to generate images. This is much slower than using native packages.
› Optionally you can stop the process and try again after successfully running `npm install -g sharp-cli`.
✔ Config synced
✔ Installed pods and initialized Xcode workspace.
› Planning build
Capabilities for Signing & Capabilities may not function correctly because its entitlements use a placeholder team ID. To resolve this, select a development team in the myreactapp editor. (in target 'myreactapp' from project 'myreactapp')
› Compiling react-native Pods/glog » vlog_is_on.cc
› Compiling react-native Pods/glog » symbolize.cc
...
› Compiling react-native Pods/RCTTypeSafety » RCTConvertHelpers.mm
❌ (/Users/kevin/my-react-app/node_modules/expo-modules-core/ios/Swift/Functions/AsyncFunctionComponent.swift:94:17)
92 | }
93 |
> 94 | let queue = queue ?? defaultQueue
| ^ variable used within its own initial value
95 |
96 | queue.async { [body, name] in
97 | let returnedValue: ReturnType?
❌ (/Users/kevin/my-react-app/node_modules/expo-modules-core/ios/Swift/Views/ConcreteViewProp.swift:42:52)
40 | }
41 | guard let value = try propType.cast(value) as? PropType else {
> 42 | throw Conversions.CastingException<PropType>(value)
| ^ variable declared in 'guard' condition is not usable in its body
43 | }
44 | setter(view, value)
45 | }
❌ (/Users/kevin/my-react-app/node_modules/expo-modules-core/ios/Swift/Arguments/Enumerable.swift:34:63)
32 | static func create<ArgType>(fromRawValue rawValue: ArgType) throws -> Self {
33 | guard let rawValue = rawValue as? RawValue else {
> 34 | throw EnumCastingException((type: RawValue.self, value: rawValue))
| ^ variable declared in 'guard' condition is not usable in its body
35 | }
36 | guard let enumCase = Self.init(rawValue: rawValue) else {
37 | throw EnumNoSuchValueException((type: Self.self, value: rawValue))
Only the first 3 errors are shown. Loads of additional errors follow.