Returns a tree that will be the result of executing the indicated
expression in the context of the indicated
This also watches the
change events. Currently, FileTree is the only type of tree that supports
change events. If a
change event is raised, the
expression is reevaluated to obtain a new result tree. Subsequent references to the
watch() result will access the new tree.
This can be used to serve a virtual folder, reevaluating its definition whenever the containing real folder changes.
$ ori @serve @watch src, =site.ori/public