fun onEnter(function: (File) -> Boolean): FileTreeWalk
Platform and version requirements: JVM
Sets a predicate function, that is called on any entered directory before its files are visited and before it is visited itself.
If the function returns false the directory is not entered and neither it nor its files are visited.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/-file-tree-walk/on-enter.html