build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext {
        VERSION_KOTLIN = "1.2.40"
    }
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0-alpha12'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$VERSION_KOTLIN"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    ext {
        VERSION_BUILD_TOOLS = "27.0.3"
        VERSION_COMPILE_SDK = 27
        VERSION_MIN_SDK = 14
        VERSION_TARGET_SDK = 27
     
        VERSION_INSTANTSEARCH = "1.+"
        VERSION_SUPPORT = "27.1.1"
        VERSION_KOTLIN = rootProject.VERSION_KOTLIN

        }

    repositories {
        jcenter()
        google()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}