Fix build.gradle setup

Author: friederbluemle

.editorconfig

@@ -7,5 +7,8 @@ indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.gradle]
+indent_size = 4
+
 [*.md]
 trim_trailing_whitespace = false

android/build.gradle

@@ -1,23 +1,50 @@
-apply plugin: 'com.android.library'
-
 def safeExtGet(prop, fallback) {
-  rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
 }
 
-android {
-  compileSdkVersion safeExtGet('compileSdkVersion', 28)
-  buildToolsVersion safeExtGet('buildToolsVersion', '28.0.3')
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    // The Android Gradle plugin is only required when opening the android folder stand-alone.
+    // This avoids unnecessary downloads and potential conflicts when the library is included as a
+    // module dependency in an application project.
+    if (project == rootProject) {
+        dependencies {
+            classpath 'com.android.tools.build:gradle:3.5.0'
+        }
+    }
+}
 
-  defaultConfig {
-    minSdkVersion safeExtGet('minSdkVersion', 16)
-    targetSdkVersion safeExtGet('targetSdkVersion', 28)
-  }
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion safeExtGet('compileSdkVersion', 28)
+    defaultConfig {
+        minSdkVersion safeExtGet('minSdkVersion', 16)
+        targetSdkVersion safeExtGet('targetSdkVersion', 28)
+    }
+    lintOptions {
+        abortOnError false
+    }
+}
 
-  lintOptions {
-    abortOnError false
-  }
+repositories {
+    mavenLocal()
+    maven {
+        // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+        url "$rootDir/../node_modules/react-native/android"
+    }
+    maven {
+        // Android JSC is installed from npm
+        url "$rootDir/../node_modules/jsc-android/dist"
+    }
+    google()
+    jcenter()
 }
 
 dependencies {
-  implementation 'com.facebook.react:react-native:+'
+    //noinspection GradleDynamicVersion
+    implementation 'com.facebook.react:react-native:+'  // From node_modules
 }

package.json

@@ -32,9 +32,12 @@
     "react-native": ">=0.56.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.6.0",
     "flow-bin": "0.98.0",
     "husky": "3.0.5",
     "lint-staged": "9.2.5",
-    "prettier": "1.18.2"
+    "prettier": "1.18.2",
+    "react": "16.8.6",
+    "react-native": "0.60.5"
   }
 }