The estree node to hash.
The json path of the node in starting from file.root. It
is composed of the properties names that lead to the node concatenated with
dots. So integers properties are within bracket. For instance:
"body.0.declarations.0.init".
The path of the file containing the node as provided by
file.path.
The kind of the node -- eg: "Program", "Statement",
"Expression", ...
The hash of the node. It should be unique for each node in the
program file.root. It is safe to simply returns node_path.
Hashing function for estree nodes.