AST node or array of nodes
A map of node types to callbacks, or a single callback that will be called for all node types, or a list of either, which will be applied in order
Optional o: { Ignore walking nodes of these types
Only walk nodes of this type
The transformation's return value on the root node(s) of the input AST, or the root node(s) if the transformation did not return a value
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Recursively execute a callback on this node and all its children. If the callback returns a non-undefined value, it will overwrite the node. This function will not modify the root node of the input AST.