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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 2015 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.common.collect.ImmutableList;
import com.google.javascript.jscomp.lint.CheckExtraRequires;

/**
 * A PassConfig to only run the CheckExtraRequires linter rule. This allows user to select which
 * goog.require imports to be removed, provided by requiresToRemove
 */
public final class CheckExtraRequiresPassConfig extends PassConfig.PassConfigDelegate {

  public CheckExtraRequiresPassConfig(CompilerOptions options) {
    super(new DefaultPassConfig(options));
  }

  @Override
  protected PassListBuilder getChecks() {
    PassListBuilder passes = new PassListBuilder(options);

    passes.maybeAdd(
        PassFactory.builder()
            .setName("removeUnusedImport")
            .setInternalFactory(
                (compiler) ->
                    new CombinedCompilerPass(
                        compiler,
                        ImmutableList.of(
                            new CheckExtraRequires(compiler, options.getUnusedImportsToRemove()))))
            .build());
    return passes;
  }

  @Override
  protected PassListBuilder getOptimizations() {
    return new PassListBuilder(options);
  }
}