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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2019 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.modules;

import com.google.auto.value.AutoValue;

/**
 * Simple class to keep track of which modules and exports have been visited when resolving exports.
 * It is invalid to visit the same (module, name) pair more than once when resolving an export
 * (invalid cycle).
 *
 * This is an AutoValue used for its hashCode / equals implementation and used in a Set for
 * equality checks. So fields may appear to be "unused".
 */
@AutoValue
abstract class ExportTrace {
  static ExportTrace create(UnresolvedModule module, String exportName) {
    return new AutoValue_ExportTrace(module, exportName);
  }

  abstract UnresolvedModule module();

  abstract String exportName();
}