def safeExtGet(prop, fallback) { rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback } buildscript { /* In case of submodule usage, do not try to apply own repositories and plugins, root project is responsible for that. */ if (rootProject.buildDir == project.buildDir) { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.4.1' } } } 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) versionCode 1 versionName "1.0" } lintOptions { abortOnError false } } repositories { google() jcenter() mavenLocal() maven { // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm url "$rootDir/../node_modules/react-native/android" } } dependencies { implementation "com.android.support:support-v4:${safeExtGet('supportLibVersion', '27.+')}" api 'com.facebook.react:react-native:+' }