Es6RewriteClassExtendsExpressions

java.lang.Object
- com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback
- - com.google.javascript.jscomp.Es6RewriteClassExtendsExpressions

All Implemented Interfaces:

CompilerPass, NodeTraversal.Callback
```
public final class Es6RewriteClassExtendsExpressions
extends NodeTraversal.AbstractPostOrderCallback
implements CompilerPass
```
Extracts ES6 class extends expressions and creates an alias.
Example: Before:
class Foo extends Bar() {}
After:
const $jscomp$classextends$var0 = Bar(); class Foo extends $jscomp$classextends$var0 {}
This must be done before Es6ConvertSuper, because that pass only handles extends clauses which are simple NAME or GETPROP nodes.
TODO(bradfordcsmith): This pass may no longer be necessary once the typechecker passes have all been updated to understand ES6 classes.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`process(Node externs, Node root)`	Process the JS with root node root.
`void`	`visit(NodeTraversal t, Node n, Node parent)`	Visits a node in postorder (after its children).

Methods inherited from class com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback
shouldTraverse

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - process
```
public void process(Node externs,
                    Node root)
```
    Description copied from interface: CompilerPass
    
    Process the JS with root node root. Can modify the contents of each Node tree
    
    Specified by:
    
    process in interface CompilerPass
    
    Parameters:
    
    externs - Top of external JS tree
    
    root - Top of JS tree
  - visit
```
public void visit(NodeTraversal t,
                  Node n,
                  Node parent)
```
    Description copied from interface: NodeTraversal.Callback
    
    Visits a node in postorder (after its children). A node is visited in postorder iff NodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node) returned true for its parent. In particular, the root node is never visited in postorder.
    Siblings are always visited left-to-right.
    Implementations can have side-effects (e.g. modify the parse tree). Removing the current node is legal, but removing or reordering nodes above the current node may cause nodes to be visited twice or not at all.
    
    Specified by:
    
    visit in interface NodeTraversal.Callback
    
    Parameters:
    
    t - The current traversal.
    
    n - The current node.
    
    parent - The parent of the current node.