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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 2016 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.debugging.sourcemap.proto.Mapping.OriginalMapping;
import org.jspecify.nullness.Nullable;

/**
 * A SourceFileMapping maps a source file, line, and column into an {@link OriginalMapping}.
 *
 * @see com.google.debugging.sourcemap.SourceMapping
 */
public interface SourceFileMapping {
  /**
   * Returns the original mapping for the file name, line number and column position found
   * in the source map. Returns {@code null} if none is found.
   *
   * @param lineNo The line number, 1-based.
   * @param columnNo The column index, 1-based.
   */
  @Nullable
  OriginalMapping getSourceMapping(String fileName, int lineNo, int columnNo);
}