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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2006 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import com.google.javascript.rhino.Node;

/**
 * Interface for classes that can compile JS.
 *
 * Class has single function "process", which is passed
 * the root node of the parsed JS tree, as well as the
 * root node of the external JS tree (used to provide a public API
 * and prevent renaming of system functions).
 *
 * Use this class to support testing with BaseCompilerTest
 */
public interface CompilerPass {

  /**
   * Process the JS with root node root.
   * Can modify the contents of each Node tree
   * @param externs Top of external JS tree
   * @param root Top of JS tree
   */
  void process(Node externs, Node root);
}