app-default.gradle

def dartEnvironmentVariables = [
    DEFINEEXAMPLE_APP_NAME: 'awesomeApp',
    DEFINEEXAMPLE_APP_SUFFIX: null
];
if (project.hasProperty('dart-defines')) {
    dartEnvironmentVariables = dartEnvironmentVariables + project.property('dart-defines')
        .split(',')
        .collectEntries { entry ->
            def pair = entry.split('=')
            [(pair.first()): pair.last()]
        }
}