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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 2014 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.refactoring;

import com.google.javascript.jscomp.AbstractCompiler;
import com.google.javascript.jscomp.NodeTraversal;
import org.jspecify.nullness.Nullable;

/**
 * Class that holds metadata (or meta objects) for use by JsFlume that aren't
 * contained within the Node itself.
 */
public final class NodeMetadata {

  private final AbstractCompiler compiler;

  private final @Nullable NodeTraversal traversal;

  public NodeMetadata(AbstractCompiler compiler) {
    this(compiler, null);
  }

  private NodeMetadata(AbstractCompiler compiler, @Nullable NodeTraversal traversal) {
    this.compiler = compiler;
    this.traversal = traversal;
  }

  public static NodeMetadata fromTraversal(NodeTraversal traversal) {
    return new NodeMetadata(traversal.getCompiler(), traversal);
  }

  public AbstractCompiler getCompiler() {
    return compiler;
  }

  public @Nullable NodeTraversal getTraversal() {
    return traversal;
  }
}