Realm crashes on create when using Haul

[theminerymike]

I've also reported this issue on Realm's github page as I'm not positive if the issue is more related to Realm or to Haul. You can follow it here realm/realm-js#2627

Goals

I am trying to get Realm working with Haul. It was working fine when I was using the react native packager but I'm not able to use the react native packager as it always crashes on load in Release with only a generic error message.

Expected Results

Successful item creation.

Actual Results

TypeError: Cannot call a class constructor without |new|

create
    [native code]:0
<unknown>
    index.bundle?platform=ios&dev=true&minify=false:14530:29
write
    [native code]:0
<unknown>
    index.bundle?platform=ios&dev=true&minify=false:14529:26
invokeGuardedCallbackImpl
    index.bundle?platform=ios&dev=true&minify=false:187192:19
invokeGuardedCallback
    index.bundle?platform=ios&dev=true&minify=false:187370:40
invokeGuardedCallbackAndCatchFirstError
    index.bundle?platform=ios&dev=true&minify=false:187385:34
executeDispatch
    index.bundle?platform=ios&dev=true&minify=false:187516:46
executeDispatchesInOrder
    index.bundle?platform=ios&dev=true&minify=false:187541:24
executeDispatchesAndRelease
    index.bundle?platform=ios&dev=true&minify=false:187711:33
forEachAccumulated
    index.bundle?platform=ios&dev=true&minify=false:187692:16
runEventsInBatch
    index.bundle?platform=ios&dev=true&minify=false:187737:25
runExtractedPluginEventsInBatch
    index.bundle?platform=ios&dev=true&minify=false:187879:23
<unknown>
    index.bundle?platform=ios&dev=true&minify=false:189433:40
batchedUpdates$1
    index.bundle?platform=ios&dev=true&minify=false:203024:18
batchedUpdates
    index.bundle?platform=ios&dev=true&minify=false:189343:34
_receiveRootNodeIDEvent
    index.bundle?platform=ios&dev=true&minify=false:189432:21
receiveEvent
    index.bundle?platform=ios&dev=true&minify=false:189447:30
__callFunction
    index.bundle?platform=ios&dev=true&minify=false:139402:47
<unknown>
    index.bundle?platform=ios&dev=true&minify=false:139115:26
__guard
    index.bundle?platform=ios&dev=true&minify=false:139353:11
callFunctionReturnFlushedQueue
    index.bundle?platform=ios&dev=true&minify=false:139114:17
callFunctionReturnFlushedQueue
    [native code]:0

Steps to Reproduce

1. git clone https://github.com/theminerymike/realm-haul.git
2. yarn install
3. cd ios && pod install
4. cd .. && yarn haul start
5. run in Xcode
6. click the button "Click Me"

Code Sample

const Realm = require('realm')

class Setting {}
Setting.schema = {
    name: 'Setting',
    primaryKey: 'key',
    properties: {
        key: 'string',
        data: 'string'
    }
}

const realm = new Realm({
    schema: [
        Setting
    ]
})

realm.write(() => {
	realm.create('Setting', {key: 'test', data: 'test'}) // breaks here
})

Version of Realm and Tooling

• Realm JS SDK Version: 3.4.2
• Node or React Native: React Native 0.61.4 and Haul "@haul-bundler/cli": "^0.15.0"
• Client OS & Version: macOS Catalina v10.15.1 running iPhone 11 simulator (also attempted on iPhone X simulator) on iOS 13.2.2

[Paweł Gulbinowicz]

Are you using @haul-bundler/babel-preset-react-native?? If so, the classes are not compiled to functions so Realm is probably not instantiating Setting with new. You can try replacing class Setting { } with function Settings() { }.

[theminerymike]

Ha, no way, you're a lifesaver. Totally did the trick :)