feat: Option Plugins (#948)

Author: wzalazar

index.js

@@ -140,7 +140,8 @@ NYC.prototype._createInstrumenter = function () {
     produceSourceMap: this.config.produceSourceMap,
     compact: this.config.compact,
     preserveComments: this.config.preserveComments,
-    esModules: this.config.esModules
+    esModules: this.config.esModules,
+    plugins: this.config.plugins
   })
 }
 

lib/instrumenters/istanbul.js

@@ -4,8 +4,11 @@ var convertSourceMap = require('convert-source-map')
 var mergeSourceMap = require('merge-source-map')
 
 function InstrumenterIstanbul (cwd, options) {
+  const plugins = options.plugins
+  const configPlugins = plugins ? { plugins } : {}
+
   var istanbul = InstrumenterIstanbul.istanbul()
-  var instrumenter = istanbul.createInstrumenter({
+  var instrumenter = istanbul.createInstrumenter(Object.assign({
     autoWrap: true,
     coverageVariable: '__coverage__',
     embedSource: true,
@@ -14,7 +17,7 @@ function InstrumenterIstanbul (cwd, options) {
     produceSourceMap: options.produceSourceMap,
     ignoreClassMethods: options.ignoreClassMethods,
     esModules: options.esModules
-  })
+  }, configPlugins))
 
   return {
     instrumentSync: function (code, filename, sourceMap) {