InjectTranspilationRuntimeLibraries

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

All Implemented Interfaces:

CompilerPass, NodeTraversal.Callback
```
public final class InjectTranspilationRuntimeLibraries
extends NodeTraversal.AbstractPostOrderCallback
implements CompilerPass
```
Injects JS library code that may be needed by the transpiled form of the input source code.
The intention here is to add anything that could be needed and rely on RemoveUnusedCode to remove the parts that don't end up getting used. This pass should run before type checking so the type checking code can add type information to the injected JavaScript for checking and optimization purposes.
This class also reports an error if it finds getters or setters are used and the language output level is too low to support them. TODO(bradfordcsmith): The getter/setter check should probably be done separately in an earlier pass that only runs when the output language level is ES3 and the input language level is ES5 or greater.
TODO(b/120486392): consider merging this pass with InjectRuntimeLibraries and RewritePolyfills.

Constructor Summary

Constructors
Constructor Description

InjectTranspilationRuntimeLibraries(AbstractCompiler compiler)

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

- Constructor Detail
  - InjectTranspilationRuntimeLibraries
```
public InjectTranspilationRuntimeLibraries(AbstractCompiler compiler)
```
- 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.