def safeExtGet(prop, fallback) { rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback } buildscript { repositories { google() maven { url 'https://maven.google.com' } jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.3.1' } } apply plugin: 'com.android.library' android { compileSdkVersion safeExtGet('compileSdkVersion', 28) buildToolsVersion safeExtGet('buildToolsVersion', '28.0.3') defaultConfig { minSdkVersion safeExtGet('minSdkVersion', 16) targetSdkVersion safeExtGet('targetSdkVersion', 28) } sourceSets { main { java.srcDirs = ['src/main/java'] } } lintOptions { abortOnError false warning 'InvalidPackage' } buildTypes { release { } } } repositories { google() jcenter() maven { url 'https://maven.google.com' } maven { url "https://jitpack.io" } maven { // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm url "$rootDir/../node_modules/react-native/android" } } dependencies { implementation 'com.facebook.react:react-native:+' }