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1 files changed, 65 insertions, 0 deletions

diff --git a/node_modules/merge-source-map/index.js b/node_modules/merge-source-map/index.js
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index 00000000..2867fb7f
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+++ b/node_modules/merge-source-map/index.js
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+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())
+}