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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 2020 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.testing;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.Compiler;
import com.google.javascript.jscomp.ErrorManager;
import com.google.javascript.rhino.Node;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.HashSet;
import java.util.Set;

/** A Compiler that records requested runtime libraries, rather than injecting. */
public class NoninjectingCompiler extends Compiler {

  public NoninjectingCompiler(ErrorManager em) {
    super(em);
  }

  public NoninjectingCompiler() {
    super();
  }

  private final Set injected = new HashSet<>();

  @Override
  public Node ensureLibraryInjected(String library, boolean force) {
    injected.add(library);
    return null;
  }

  @Override
  @GwtIncompatible
  public final void saveState(OutputStream outputStream) throws IOException {
    super.saveState(outputStream);
    ObjectOutputStream out = new ObjectOutputStream(outputStream);
    out.writeObject(injected);
  }

  @SuppressWarnings("unchecked")
  @Override
  @GwtIncompatible
  public final void restoreState(InputStream inputStream)
      throws IOException, ClassNotFoundException {
    super.restoreState(inputStream);
    ObjectInputStream in = new ObjectInputStream(inputStream);
    injected.clear();
    injected.addAll((Set) in.readObject());
  }

  public final ImmutableSet getInjected() {
    return ImmutableSet.copyOf(injected);
  }
}