buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.1.4' } } apply plugin: 'com.android.library' def safeExtGet(prop, fallback) { rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback } android { compileSdkVersion safeExtGet("compileSdkVersion", 26) buildToolsVersion safeExtGet("buildToolsVersion", "27.0.3") defaultConfig { minSdkVersion safeExtGet("minSdkVersion", 16) targetSdkVersion safeExtGet("targetSdkVersion", 26) versionCode 1 versionName "1.0" } lintOptions { abortOnError false } } repositories { mavenCentral() } dependencies { implementation "com.facebook.react:react-native:${safeExtGet("reactNative", "+")}" // from node_modules }