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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 2017 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.deps;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.CheckLevel;
import com.google.javascript.jscomp.ErrorHandler;
import com.google.javascript.jscomp.JSError;
import com.google.javascript.jscomp.deps.ModuleLoader.ModuleResolverFactory;
import com.google.javascript.jscomp.deps.ModuleLoader.PathEscaper;
import org.jspecify.nullness.Nullable;

/**
 * Resolution algorithm for Browsers.
 *
 * Only unambiguous paths are supported. Paths must specify a file extension.
 */
public class BrowserModuleResolver extends ModuleResolver {

  public static final ModuleResolverFactory FACTORY = BrowserModuleResolver::new;

  public BrowserModuleResolver(
      ImmutableSet modulePaths,
      ImmutableList moduleRootPaths,
      ErrorHandler errorHandler,
      PathEscaper pathEscaper) {
    super(modulePaths, moduleRootPaths, errorHandler, pathEscaper);
  }

  @Override
  public @Nullable String resolveJsModule(
      String scriptAddress, String moduleAddress, String sourcename, int lineno, int colno) {

    if (ModuleLoader.isAmbiguousIdentifier(moduleAddress)) {
      errorHandler.report(
          CheckLevel.WARNING,
          JSError.make(
              sourcename,
              lineno,
              colno,
              ModuleLoader.INVALID_MODULE_PATH,
              moduleAddress,
              ModuleLoader.ResolutionMode.BROWSER.toString()));
      return null;
    }

    String loadAddress = locate(scriptAddress, moduleAddress);
    if (loadAddress == null) {
      errorHandler.report(
          CheckLevel.WARNING,
          JSError.make(sourcename, lineno, colno, ModuleLoader.LOAD_WARNING, moduleAddress));
    }
    return loadAddress;
  }
}