1 files changed, 49 insertions, 0 deletions
diff --git a/node_modules/nyc/lib/instrumenters/istanbul.js b/node_modules/nyc/lib/instrumenters/istanbul.js
new file mode 100644
index 000000000..c1d4b1338
--- /dev/null
+++ b/node_modules/nyc/lib/instrumenters/istanbul.js
@@ -0,0 +1,49 @@
+'use strict'
+
+var convertSourceMap = require('convert-source-map')
+var mergeSourceMap = require('merge-source-map')
+
+function InstrumenterIstanbul (cwd, options) {
+  var istanbul = InstrumenterIstanbul.istanbul()
+  var instrumenter = istanbul.createInstrumenter({
+    autoWrap: true,
+    coverageVariable: '__coverage__',
+    embedSource: true,
+    noCompact: false,
+    preserveComments: true,
+    produceSourceMap: options.produceSourceMap
+  })
+
+  return {
+    instrumentSync: function (code, filename, sourceMap) {
+      var instrumented = instrumenter.instrumentSync(code, filename)
+      // the instrumenter can optionally produce source maps,
+      // this is useful for features like remapping stack-traces.
+      // TODO: test source-map merging logic.
+      if (options.produceSourceMap) {
+        var lastSourceMap = instrumenter.lastSourceMap()
+        if (lastSourceMap) {
+          if (sourceMap) {
+            lastSourceMap = mergeSourceMap(
+              sourceMap.toObject(),
+              lastSourceMap
+            )
+          }
+          instrumented += '\n' + convertSourceMap.fromObject(lastSourceMap).toComment()
+        }
+      }
+      return instrumented
+    },
+    lastFileCoverage: function () {
+      return instrumenter.lastFileCoverage()
+    }
+  }
+}
+
+InstrumenterIstanbul.istanbul = function () {
+  InstrumenterIstanbul._istanbul || (InstrumenterIstanbul._istanbul = require('istanbul-lib-instrument'))
+
+  return InstrumenterIstanbul._istanbul || (InstrumenterIstanbul._istanbul = require('istanbul'))
+}
+
+module.exports = InstrumenterIstanbul