RewritePolyfills

java.lang.Object
- com.google.javascript.jscomp.RewritePolyfills

All Implemented Interfaces:

CompilerPass
```
public class RewritePolyfills
extends java.lang.Object
implements CompilerPass
```
Injects polyfill libraries to ensure that ES6+ library functions are available.
Also runs if polyfill isolation is enabled, even if polyfill injection is disabled, in order to prevent deletion of a required library function by dead code elimination.
TODO(b/120486392): consider merging this pass with InjectRuntimeLibraries and InjectTranspilationRuntimeLibraries.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  RewritePolyfills(AbstractCompiler compiler, boolean injectPolyfills, boolean isolatePolyfills)
- 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.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RewritePolyfills
```
public RewritePolyfills(AbstractCompiler compiler,
                        boolean injectPolyfills,
                        boolean isolatePolyfills)
```
    Parameters:
    
    injectPolyfills - if true, injects $jscomp.polyfill initializations into the first input. if false, no polyfills are injected.
    
    isolatePolyfills - if true, adds externs for library functions used by IsolatePolyfills to prevent their deletion.
- 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