I’ve started adding product flavours to a react native android app as described here. But running the start script react-native run-android --mode=developmentdebug --appId .dev hangs indefinitely on :app:createBundleDevelopmentDebugJsAndAssets task.

Before adding the productFlavors to the build.gradle the app would start with react-native run-android".

Looking at other apps that setup product flavours, I don’t see anything different in my build.gradle config.

Any ideas what could be going wrong here with the createBundleDevelopmentDebugJsAndAssets task?

Logs (The task just hangs at 11%)

Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use --status for details

> Configure project :app
Reading env from: .env.debug
WARNING: DSL element 'dexOptions' is obsolete and should be removed.
It will be removed in version 8.0 of the Android Gradle plugin.
Using it has no effect, and the AndroidGradle plugin optimizes dexing automatically.

> Configure project :react-native-reanimated
Android gradle plugin: 8.1.1
Gradle: 8.3

> Task :app:createBundleDevelopmentDebugJsAndAssets
debug Reading Metro config from /Users/brianvarley/Projects/ChillMode/metro.config.js
warning: the transform cache was reset.
                Welcome to Metro v0.80.6
              Fast - Scalable - Integrated


<=------------> 11% EXECUTING [9m 12s]
> IDLE
> :app:createBundleDevelopmentDebugJsAndAssets

This is a summarised version of the app/build.gradle for reference:

apply plugin: "com.android.application"
apply plugin: "org.jetbrains.kotlin.android"
apply plugin: "com.facebook.react"

project.ext.envConfigFiles = [
   productionrelease: ".env.prod",
   developmentdebug: ".env.debug",
]

project.ext.react = [
    inputExcludes: ["ios/**", "__tests__/**", "bundle_out/**"]
];
apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"

...

android {

    dexOptions {
        preDexLibraries false
        javaMaxHeapSize "8g"
    }

    ndkVersion rootProject.ext.ndkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
    compileSdk rootProject.ext.compileSdkVersion

    namespace "com.bvapps.chillmode"
    flavorDimensions "default"
    defaultConfig {
        applicationId "com.bvapps.chillmode"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
    }
    signingConfigs {
        debug {
            storeFile file('debug.keystore')
            storePassword 'android'
            keyAlias 'androiddebugkey'
            keyPassword 'android'
        }
        release {
            if (project.env.get('RELEASE_STORE_FILE')) {
                storeFile file(project.env.get('RELEASE_STORE_FILE'))
                storePassword project.env.get('RELEASE_STORE_PASSWORD')
                keyAlias project.env.get('RELEASE_KEY_ALIAS')
                keyPassword project.env.get('RELEASE_KEY_PASSWORD')
            }
        }
    }
    productFlavors {
        production {
            dimension "default"
            applicationIdSuffix ".prod"
        }
        development {
            dimension "default"
            applicationIdSuffix ".dev"
        }
    }
    buildTypes {
        debug {
            signingConfig signingConfigs.debug
        }
        release {
            // Caution! In production, you need to generate your own keystore file.
            // see https://reactnative.dev/docs/signed-apk-android.
            signingConfig signingConfigs.debug
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
    }
}

dependencies {
    // The version of react-native is set by the React Native Gradle Plugin
    implementation("com.facebook.react:react-android")
    implementation("com.facebook.react:flipper-integration")

    if (hermesEnabled.toBoolean()) {
        implementation("com.facebook.react:hermes-android")
    } else {
        implementation jscFlavor
    }
}

apply from: file("../../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesAppBuildGradle(project)