<dependency>
  <groupId>com.github.keithyokoma</groupId>
  <artifactId>Optional</artifactId>
  <version>1.0.0</version>
  <type>aar</type>
</dependency>

implementation 'com.github.keithyokoma:Optional:1.0.0'

implementation("com.github.keithyokoma:Optional:1.0.0")

libraryDependencies += "com.github.keithyokoma" % "Optional" % "1.0.0"

@Grapes(
  @Grab(group='com.github.keithyokoma', module='Optional', version='1.0.0')
)

<dependency org="com.github.keithyokoma" name="Optional" rev="1.0.0" />

[com.github.keithyokoma/Optional "1.0.0"]

'com.github.keithyokoma:Optional:jar:1.0.0'