https://developer.mozilla.org/en-US/docs/Web/API/LaunchParams/files
LaunchParams: files property - Web APIs | MDN
The files read-only property of the LaunchParams interface returns an array of FileSystemHandle objects representing any files passed along with the launch...
web apisfilespropertymdn
https://beam.apache.org/releases/javadoc/2.22.0/org/apache/beam/runners/apex/ApexYarnLauncher.LaunchParams.html
ApexYarnLauncher.LaunchParams (Apache Beam 2.22.0)
apache beam