def safeExtGet(prop, fallback) { rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback } buildscript { repositories { jcenter() google() } dependencies { classpath 'com.android.tools.build:gradle:3.1.4' } } apply plugin: 'com.android.library' android { compileSdkVersion safeExtGet('compileSdkVersion', 26) buildToolsVersion safeExtGet('buildToolsVersion', '26.0.3') defaultConfig { minSdkVersion safeExtGet('minSdkVersion', 16) targetSdkVersion safeExtGet('targetSdkVersion', 26) versionCode 1 versionName "1.0" } lintOptions { abortOnError false } } repositories { jcenter() 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:+' implementation 'com.facebook.shimmer:shimmer:0.5.0@aar' }