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Viewing file:     index.js (2.06 KB)      -rw-r--r--

var sourceMap = require('source-map')
var SourceMapConsumer = sourceMap.SourceMapConsumer
var SourceMapGenerator = sourceMap.SourceMapGenerator

module.exports = merge

/**
 * Merge old source map and new source map and return merged.
 * If old or new source map value is falsy, return another one as it is.
 *
 * @param {object|string} [oldMap] old source map object
 * @param {object|string} [newmap] new source map object
 * @return {object|undefined} merged source map object, or undefined when both old and new source map are undefined
 */
function merge(oldMap, newMap) {
  if (!oldMap) return newMap
  if (!newMap) return oldMap

  var oldMapConsumer = new SourceMapConsumer(oldMap)
  var newMapConsumer = new SourceMapConsumer(newMap)
  var mergedMapGenerator = new SourceMapGenerator()

  // iterate on new map and overwrite original position of new map with one of old map
  newMapConsumer.eachMapping(function(m) {
    // pass when `originalLine` is null.
    // It occurs in case that the node does not have origin in original code.
    if (m.originalLine == null) return

    var origPosInOldMap = oldMapConsumer.originalPositionFor({
      line: m.originalLine,
      column: m.originalColumn
    })

    if (origPosInOldMap.source == null) return

    mergedMapGenerator.addMapping({
      original: {
        line: origPosInOldMap.line,
        column: origPosInOldMap.column
      },
      generated: {
        line: m.generatedLine,
        column: m.generatedColumn
      },
      source: origPosInOldMap.source,
      name: origPosInOldMap.name
    })
  })

  var consumers = [oldMapConsumer, newMapConsumer]
  consumers.forEach(function(consumer) {
    consumer.sources.forEach(function(sourceFile) {
      mergedMapGenerator._sources.add(sourceFile)
      var sourceContent = consumer.sourceContentFor(sourceFile)
      if (sourceContent != null) {
        mergedMapGenerator.setSourceContent(sourceFile, sourceContent)
      }
    })
  })

  mergedMapGenerator._sourceRoot = oldMap.sourceRoot
  mergedMapGenerator._file = oldMap.file

  return JSON.parse(mergedMapGenerator.toString())
}