we should still run transpilers on source files included via --all

bin/nyc.js

@@ -119,11 +119,14 @@ if (argv._[0] === 'report') {
   checkCoverage(argv)
 } else if (argv._.length) {
   // wrap subprocesses and execute argv[1]
-  var nyc = (new NYC())
+  if (!Array.isArray(argv.require)) argv.require = [argv.require]
+
+  var nyc = (new NYC({
+    require: argv.require
+  }))
   nyc.reset()
 
   if (argv.all) nyc.addAllFiles()
-  if (!Array.isArray(argv.require)) argv.require = [argv.require]
 
   var env = {
     NYC_CWD: process.cwd(),

index.js

@@ -3,12 +3,12 @@ var fs = require('fs')
 var glob = require('glob')
 var micromatch = require('micromatch')
 var mkdirp = require('mkdirp')
+var Module = require('module')
 var appendTransform = require('append-transform')
 var cachingTransform = require('caching-transform')
 var path = require('path')
 var rimraf = require('rimraf')
 var onExit = require('signal-exit')
-var stripBom = require('strip-bom')
 var resolveFrom = require('resolve-from')
 var arrify = require('arrify')
 var SourceMapCache = require('./lib/source-map-cache')
@@ -158,15 +158,26 @@ NYC.prototype._prepGlobPatterns = function (patterns) {
 
 NYC.prototype.addFile = function (filename) {
   var relFile = path.relative(this.cwd, filename)
-  var source = stripBom(fs.readFileSync(filename, 'utf8'))
+  var source = this._readTranspiledSource(path.resolve(this.cwd, filename))
   var instrumentedSource = this._maybeInstrumentSource(source, filename, relFile)
+
   return {
     instrument: !!instrumentedSource,
     relFile: relFile,
     content: instrumentedSource || source
   }
 }
 
+NYC.prototype._readTranspiledSource = function (path) {
+  var source = null
+  Module._extensions['.js']({
+    _compile: function (content, filename) {
+      source = content
+    }
+  }, path)
+  return source
+}
+
 NYC.prototype.shouldInstrumentFile = function (filename, relFile) {
   relFile = relFile.replace(/^\.\//, '') // remove leading './'.
 
@@ -177,8 +188,10 @@ NYC.prototype.shouldInstrumentFile = function (filename, relFile) {
 NYC.prototype.addAllFiles = function () {
   var _this = this
 
+  this._loadAdditionalModules()
+
   glob.sync('**/*.js', {nodir: true, ignore: this.exclude}).forEach(function (filename) {
-    var obj = _this.addFile(filename, true)
+    var obj = _this.addFile(filename)
     if (obj.instrument) {
       module._compile(
         _this.instrumenter().getPreamble(obj.content, obj.relFile),

test/fixtures/transpile-hook.js

@@ -0,0 +1,6 @@
+var fs = require('fs')
+
+require.extensions['.js'] = function (module, filename) {
+  var content = fs.readFileSync(filename, 'utf8');
+  module._compile(content.replace('--> pork chop sandwiches <--', ''), filename);
+}

test/src/nyc-test.js

@@ -474,6 +474,32 @@ describe('nyc', function () {
 
       return done()
     })
+
+    it('transpiles files added via addAllFiles', function (done) {
+      fs.writeFileSync(
+        './test/fixtures/needs-transpile.js',
+        '--> pork chop sandwiches <--\nvar a = 99',
+        'utf-8'
+      )
+
+      var nyc = (new NYC({
+        require: './test/fixtures/transpile-hook'
+      }))
+
+      nyc.reset()
+      nyc.addAllFiles()
+
+      var reports = _.filter(nyc._loadReports(), function (report) {
+        return ap(report)['./test/fixtures/needs-transpile.js']
+      })
+      var report = reports[0]['./test/fixtures/needs-transpile.js']
+
+      reports.length.should.equal(1)
+      report.s['1'].should.equal(0)
+
+      fs.unlinkSync('./test/fixtures/needs-transpile.js')
+      return done()
+    })
   })
 
   describe('cache', function () {