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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 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.annotations.GwtIncompatible;
import com.google.javascript.jscomp.deps.ModuleLoader.ResolutionMode;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.kohsuke.args4j.Argument;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;
import org.kohsuke.args4j.Option;

/**
 * Minimal binary that just runs the "lint" checks which can be run on a single file at a time. This
 * means some checks in the lintChecks DiagnosticGroup are skipped, since they depend on type
 * information.
 */
@GwtIncompatible("Unnecessary")
public final class LinterMain {
  @Option(name = "--fix", usage = "Fix lint warnings automatically")
  private boolean fix = false;

  @Option(
      name = "--resolution_mode",
      usage = "Expected path resolution mode for resolving module specifiers.")
  private ResolutionMode resolutionMode = ResolutionMode.BROWSER;

  @Argument private List files = new ArrayList<>();

  public static void main(String[] args) throws IOException, CmdLineException {
    new LinterMain().run(args);
  }

  private void run(String[] args) throws IOException, CmdLineException {
    CmdLineParser parser = new CmdLineParser(this);
    parser.parseArgument(args);

    Linter linter = Linter.builder().withModuleResolutionMode(resolutionMode).build();

    for (String filename : files) {
      if (fix) {
        linter.fixRepeatedly(filename);
      } else {
        linter.lint(filename);
      }
    }
  }
}