Minimum complete reproducible example of the `defaultSource` prop issue

by React

There’s an issue when adding a defaultSource prop to the Image component from the react-native library on iOS causes an error.

Replication steps

  1. Install dependencies in this project with yarn
  2. Start a local server with yarn start --force-manifest-type=expo-updates. That flag causes the local server to serve the modern manifest type.
  3. Press “i” to open the app in an iOS simulator.
  4. I expect to see an image of a plant, but instead I see this error:

JSON value '{
    "__packager_asset" = 1;
    height = 718;
    scale = 1;
    uri = "https://d1wp6m56sqw74a.cloudfront.net/~assets/f42d36968b67e046ae764b0fe4f30966";
    width = 828;
}' of type NSMutableDictionary cannot be converted to an image. Only local files or data URIs are supported.

+[ABI43_0_0RCTConvert(Deprecated) UIImage:]
    ABI43_0_0RCTConvert.m:1214
__58-[ABI43_0_0RCTComponentData createPropBlock:isShadowView:]_block_invoke.89
__58-[ABI43_0_0RCTComponentData createPropBlock:isShadowView:]_block_invoke_2.90
__46-[ABI43_0_0RCTComponentData setProps:forView:]_block_invoke
__NSDICTIONARY_IS_CALLING_OUT_TO_A_BLOCK__
-[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:]
-[ABI43_0_0RCTComponentData setProps:forView:]
__53-[ABI43_0_0RCTUIManager flushUIBlocksWithCompletion:]_block_invoke
__53-[ABI43_0_0RCTUIManager flushUIBlocksWithCompletion:]_block_invoke.426
_dispatch_call_block_and_release
_dispatch_client_callout
_dispatch_main_queue_callback_4CF
__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__
__CFRunLoopRun
CFRunLoopRunSpecific
GSEventRunModal
-[UIApplication _run]
UIApplicationMain
main
start_sim
0x0
0x0
__dso_handle

Observations

  1. This problem goes away if you remove the defaultSource prop
  2. This only appears on iOS for me, when loading the first time or “hard” reloading. If you make a change and let the simulator hot reload, the error goes away.
  3. I’ve never actually seen the default image load, even when the real image is being downloaded.

GitHub

View Github