public keyword

You can use public to declare the visibility of your functions and methods.

If a function or method does not have public, it can only be used in the current file where it is defined.

fun visible_in_the_current_file() {}

If you use public, you are declaring a function that can be used anywhere.

public fun visible_everywhere() {}

import "./other_file.gdn" as other_file

other_file::visible_everywhere()

The keywords shared, internal and external are currently reserved for additional visibility levels.