Call estraverse.traverse or estraverse.replace with an object that has the following methods:

• enter - Called when entering a node
• leave - Called when leaving a node

Both of these methods have the following signature: function(node, parent). Note that parent can be null in some situations.

The enter function may control the traversal by returning the following values (or calling corresponding methods):

• estraverse.VisitorOption.Skip / this.skip() - Skips walking child nodes of this node. The leave function will still be called.
• estraverse.VisitorOption.Break / this.break() - Ends it all

The leave function can also control the traversal by returning the following values:

• estraverse.VisitorOption.Break / this.break() - Ends it all

In estraverse.replace you can also return one of:

• new node to replace old one with

• estraverse.VisitorOption.Remove / this.remove() - Removes current node from parent array or replaces with null if not element of array.