diff --git a/README.md b/README.md
index 8c5e09011..ba0a21a22 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ GopherJS compiles Go code ([golang.org](https://golang.org/)) to pure JavaScript
 Give GopherJS a try on the [GopherJS Playground](http://gopherjs.github.io/playground/).
 
 ### What is supported?
-Nearly everything, including Goroutines ([compatibility table](https://github.com/gopherjs/gopherjs/blob/master/doc/packages.md)). Performance is quite good in most cases, see [HTML5 game engine benchmark](https://ajhager.github.io/engi/demos/botmark.html). Cgo is not supported. Using a vendored copy of GopherJS is currently not supported, see [#415](https://github.com/gopherjs/gopherjs/issues/415).
+Nearly everything, including Goroutines ([compatibility table](https://github.com/gopherjs/gopherjs/blob/master/doc/packages.md)). Performance is quite good in most cases, see [HTML5 game engine benchmark](https://ajhager.github.io/engi/demos/botmark.html). Cgo is not supported.
 
 ### Installation and Usage
 Get or update GopherJS and dependencies with:
diff --git a/build/build.go b/build/build.go
index 095e28616..82edb1f24 100644
--- a/build/build.go
+++ b/build/build.go
@@ -21,8 +21,11 @@ import (
 
 	"github.com/fsnotify/fsnotify"
 	"github.com/gopherjs/gopherjs/compiler"
+	"github.com/gopherjs/gopherjs/compiler/gopherjspkg"
 	"github.com/gopherjs/gopherjs/compiler/natives"
 	"github.com/neelance/sourcemap"
+	"github.com/shurcooL/httpfs/vfsutil"
+	"golang.org/x/tools/go/buildutil"
 )
 
 type ImportCError struct {
@@ -33,7 +36,13 @@ func (e *ImportCError) Error() string {
 	return e.pkgPath + `: importing "C" is not supported by GopherJS`
 }
 
+// NewBuildContext creates a build context for building Go packages
+// with GopherJS compiler.
+//
+// Core GopherJS packages (i.e., "github.com/gopherjs/gopherjs/js", "github.com/gopherjs/gopherjs/nosync")
+// are loaded from gopherjspkg.FS virtual filesystem rather than GOPATH.
 func NewBuildContext(installSuffix string, buildTags []string) *build.Context {
+	gopherjsRoot := filepath.Join(build.Default.GOROOT, "src", "github.com", "gopherjs", "gopherjs")
 	return &build.Context{
 		GOROOT:        build.Default.GOROOT,
 		GOPATH:        build.Default.GOPATH,
@@ -47,9 +56,52 @@ func NewBuildContext(installSuffix string, buildTags []string) *build.Context {
 		),
 		ReleaseTags: build.Default.ReleaseTags,
 		CgoEnabled:  true, // detect `import "C"` to throw proper error
+
+		IsDir: func(path string) bool {
+			if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) {
+				path = filepath.ToSlash(path[len(gopherjsRoot):])
+				if fi, err := vfsutil.Stat(gopherjspkg.FS, path); err == nil {
+					return fi.IsDir()
+				}
+			}
+			fi, err := os.Stat(path)
+			return err == nil && fi.IsDir()
+		},
+		ReadDir: func(path string) ([]os.FileInfo, error) {
+			if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) {
+				path = filepath.ToSlash(path[len(gopherjsRoot):])
+				if fis, err := vfsutil.ReadDir(gopherjspkg.FS, path); err == nil {
+					return fis, nil
+				}
+			}
+			return ioutil.ReadDir(path)
+		},
+		OpenFile: func(path string) (io.ReadCloser, error) {
+			if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) {
+				path = filepath.ToSlash(path[len(gopherjsRoot):])
+				if f, err := gopherjspkg.FS.Open(path); err == nil {
+					return f, nil
+				}
+			}
+			return os.Open(path)
+		},
 	}
 }
 
+// statFile returns an os.FileInfo describing the named file.
+// For files in "$GOROOT/src/github.com/gopherjs/gopherjs" directory,
+// gopherjspkg.FS is consulted first.
+func statFile(path string) (os.FileInfo, error) {
+	gopherjsRoot := filepath.Join(build.Default.GOROOT, "src", "github.com", "gopherjs", "gopherjs")
+	if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) {
+		path = filepath.ToSlash(path[len(gopherjsRoot):])
+		if fi, err := vfsutil.Stat(gopherjspkg.FS, path); err == nil {
+			return fi, nil
+		}
+	}
+	return os.Stat(path)
+}
+
 // Import returns details about the Go package named by the import path. If the
 // path is a local import path naming a package that can be imported using
 // a standard import path, the returned package will set p.ImportPath to
@@ -72,11 +124,13 @@ func Import(path string, mode build.ImportMode, installSuffix string, buildTags
 		// Import will not be able to resolve relative import paths.
 		wd = ""
 	}
-	return importWithSrcDir(path, wd, mode, installSuffix, buildTags)
+	bctx := NewBuildContext(installSuffix, buildTags)
+	return importWithSrcDir(*bctx, path, wd, mode, installSuffix)
 }
 
-func importWithSrcDir(path string, srcDir string, mode build.ImportMode, installSuffix string, buildTags []string) (*PackageData, error) {
-	bctx := NewBuildContext(installSuffix, buildTags)
+func importWithSrcDir(bctx build.Context, path string, srcDir string, mode build.ImportMode, installSuffix string) (*PackageData, error) {
+	// bctx is passed by value, so it can be modified here.
+	var isVirtual bool
 	switch path {
 	case "syscall":
 		// syscall needs to use a typical GOARCH like amd64 to pick up definitions for _Socklen, BpfInsn, IFNAMSIZ, Timeval, BpfStat, SYS_FCNTL, Flock_t, etc.
@@ -91,17 +145,17 @@ func importWithSrcDir(path string, srcDir string, mode build.ImportMode, install
 	case "crypto/x509", "os/user":
 		// These stdlib packages have cgo and non-cgo versions (via build tags); we want the latter.
 		bctx.CgoEnabled = false
+	case "github.com/gopherjs/gopherjs/js", "github.com/gopherjs/gopherjs/nosync":
+		// These packages are already embedded via gopherjspkg.FS virtual filesystem (which can be
+		// safely vendored). Don't try to use vendor directory to resolve them.
+		mode |= build.IgnoreVendor
+		isVirtual = true
 	}
 	pkg, err := bctx.Import(path, srcDir, mode)
 	if err != nil {
 		return nil, err
 	}
 
-	// TODO: Resolve issue #415 and remove this temporary workaround.
-	if strings.HasSuffix(pkg.ImportPath, "/vendor/github.com/gopherjs/gopherjs/js") {
-		return nil, fmt.Errorf("vendoring github.com/gopherjs/gopherjs/js package is not supported, see https://github.com/gopherjs/gopherjs/issues/415")
-	}
-
 	switch path {
 	case "os":
 		pkg.GoFiles = excludeExecutable(pkg.GoFiles) // Need to exclude executable implementation files, because some of them contain package scope variables that perform (indirectly) syscalls on init.
@@ -135,12 +189,12 @@ func importWithSrcDir(path string, srcDir string, mode build.ImportMode, install
 		}
 	}
 
-	jsFiles, err := jsFilesFromDir(pkg.Dir)
+	jsFiles, err := jsFilesFromDir(&bctx, pkg.Dir)
 	if err != nil {
 		return nil, err
 	}
 
-	return &PackageData{Package: pkg, JSFiles: jsFiles}, nil
+	return &PackageData{Package: pkg, JSFiles: jsFiles, IsVirtual: isVirtual}, nil
 }
 
 // excludeExecutable excludes all executable implementation .go files.
@@ -174,12 +228,13 @@ Outer:
 // ImportDir is like Import but processes the Go package found in the named
 // directory.
 func ImportDir(dir string, mode build.ImportMode, installSuffix string, buildTags []string) (*PackageData, error) {
-	pkg, err := NewBuildContext(installSuffix, buildTags).ImportDir(dir, mode)
+	bctx := NewBuildContext(installSuffix, buildTags)
+	pkg, err := bctx.ImportDir(dir, mode)
 	if err != nil {
 		return nil, err
 	}
 
-	jsFiles, err := jsFilesFromDir(pkg.Dir)
+	jsFiles, err := jsFilesFromDir(bctx, pkg.Dir)
 	if err != nil {
 		return nil, err
 	}
@@ -198,7 +253,7 @@ func ImportDir(dir string, mode build.ImportMode, installSuffix string, buildTag
 // as an existing file from the standard library). For all identifiers that exist
 // in the original AND the overrides, the original identifier in the AST gets
 // replaced by `_`. New identifiers that don't exist in original package get added.
-func parseAndAugment(pkg *build.Package, isTest bool, fileSet *token.FileSet) ([]*ast.File, error) {
+func parseAndAugment(bctx *build.Context, pkg *build.Package, isTest bool, fileSet *token.FileSet) ([]*ast.File, error) {
 	var files []*ast.File
 	replacedDeclNames := make(map[string]bool)
 	funcName := func(d *ast.FuncDecl) string {
@@ -302,10 +357,10 @@ func parseAndAugment(pkg *build.Package, isTest bool, fileSet *token.FileSet) ([
 
 	var errList compiler.ErrorList
 	for _, name := range pkg.GoFiles {
-		if !filepath.IsAbs(name) {
+		if !filepath.IsAbs(name) { // name might be absolute if specified directly. E.g., `gopherjs build /abs/file.go`.
 			name = filepath.Join(pkg.Dir, name)
 		}
-		r, err := os.Open(name)
+		r, err := buildutil.OpenFile(bctx, name)
 		if err != nil {
 			return nil, err
 		}
@@ -406,10 +461,12 @@ type PackageData struct {
 	IsTest     bool // IsTest is true if the package is being built for running tests.
 	SrcModTime time.Time
 	UpToDate   bool
+	IsVirtual  bool // If true, the package does not have a corresponding physical directory on disk.
 }
 
 type Session struct {
 	options  *Options
+	bctx     *build.Context
 	Archives map[string]*compiler.Archive
 	Types    map[string]*types.Package
 	Watcher  *fsnotify.Watcher
@@ -428,6 +485,7 @@ func NewSession(options *Options) *Session {
 		options:  options,
 		Archives: make(map[string]*compiler.Archive),
 	}
+	s.bctx = NewBuildContext(s.InstallSuffix(), s.options.BuildTags)
 	s.Types = make(map[string]*types.Package)
 	if options.Watch {
 		if out, err := exec.Command("ulimit", "-n").Output(); err == nil {
@@ -445,6 +503,9 @@ func NewSession(options *Options) *Session {
 	return s
 }
 
+// BuildContext returns the session's build context.
+func (s *Session) BuildContext() *build.Context { return s.bctx }
+
 func (s *Session) InstallSuffix() string {
 	if s.options.Minify {
 		return "min"
@@ -456,12 +517,12 @@ func (s *Session) BuildDir(packagePath string, importPath string, pkgObj string)
 	if s.Watcher != nil {
 		s.Watcher.Add(packagePath)
 	}
-	buildPkg, err := NewBuildContext(s.InstallSuffix(), s.options.BuildTags).ImportDir(packagePath, 0)
+	buildPkg, err := s.bctx.ImportDir(packagePath, 0)
 	if err != nil {
 		return err
 	}
 	pkg := &PackageData{Package: buildPkg}
-	jsFiles, err := jsFilesFromDir(pkg.Dir)
+	jsFiles, err := jsFilesFromDir(s.bctx, pkg.Dir)
 	if err != nil {
 		return err
 	}
@@ -514,7 +575,7 @@ func (s *Session) BuildImportPath(path string) (*compiler.Archive, error) {
 }
 
 func (s *Session) buildImportPathWithSrcDir(path string, srcDir string) (*PackageData, *compiler.Archive, error) {
-	pkg, err := importWithSrcDir(path, srcDir, 0, s.InstallSuffix(), s.options.BuildTags)
+	pkg, err := importWithSrcDir(*s.bctx, path, srcDir, 0, s.InstallSuffix())
 	if s.Watcher != nil && pkg != nil { // add watch even on error
 		s.Watcher.Add(pkg.Dir)
 	}
@@ -580,7 +641,7 @@ func (s *Session) BuildPackage(pkg *PackageData) (*compiler.Archive, error) {
 		}
 
 		for _, name := range append(pkg.GoFiles, pkg.JSFiles...) {
-			fileInfo, err := os.Stat(filepath.Join(pkg.Dir, name))
+			fileInfo, err := statFile(filepath.Join(pkg.Dir, name))
 			if err != nil {
 				return nil, err
 			}
@@ -614,7 +675,7 @@ func (s *Session) BuildPackage(pkg *PackageData) (*compiler.Archive, error) {
 	}
 
 	fileSet := token.NewFileSet()
-	files, err := parseAndAugment(pkg.Package, pkg.IsTest, fileSet)
+	files, err := parseAndAugment(s.bctx, pkg.Package, pkg.IsTest, fileSet)
 	if err != nil {
 		return nil, err
 	}
@@ -752,8 +813,8 @@ func NewMappingCallback(m *sourcemap.Map, goroot, gopath string, localMap bool)
 	}
 }
 
-func jsFilesFromDir(dir string) ([]string, error) {
-	files, err := ioutil.ReadDir(dir)
+func jsFilesFromDir(bctx *build.Context, dir string) ([]string, error) {
+	files, err := buildutil.ReadDir(bctx, dir)
 	if err != nil {
 		return nil, err
 	}
diff --git a/build/build_test.go b/build/build_test.go
index 837af1c49..659aff3e3 100644
--- a/build/build_test.go
+++ b/build/build_test.go
@@ -77,7 +77,7 @@ func TestNativesDontImportExtraPackages(t *testing.T) {
 
 			// Use parseAndAugment to get a list of augmented AST files.
 			fset := token.NewFileSet()
-			files, err := parseAndAugment(bpkg, false, fset)
+			files, err := parseAndAugment(NewBuildContext("", nil), bpkg, false, fset)
 			if err != nil {
 				t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err)
 			}
@@ -116,7 +116,7 @@ func TestNativesDontImportExtraPackages(t *testing.T) {
 
 			// Use parseAndAugment to get a list of augmented AST files.
 			fset := token.NewFileSet()
-			files, err := parseAndAugment(bpkg, true, fset)
+			files, err := parseAndAugment(NewBuildContext("", nil), bpkg, true, fset)
 			if err != nil {
 				t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err)
 			}
@@ -158,7 +158,7 @@ func TestNativesDontImportExtraPackages(t *testing.T) {
 
 			// Use parseAndAugment to get a list of augmented AST files, then check only the external test files.
 			fset := token.NewFileSet()
-			files, err := parseAndAugment(bpkg, true, fset)
+			files, err := parseAndAugment(NewBuildContext("", nil), bpkg, true, fset)
 			if err != nil {
 				t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err)
 			}
diff --git a/compiler/gopherjspkg/doc.go b/compiler/gopherjspkg/doc.go
new file mode 100644
index 000000000..f57e84f74
--- /dev/null
+++ b/compiler/gopherjspkg/doc.go
@@ -0,0 +1,12 @@
+// Package gopherjspkg provides core GopherJS packages via a virtual filesystem.
+//
+// Core GopherJS packages are packages that are critical for GopherJS compiler
+// operation. They are needed to build the Go standard library with GopherJS.
+// Currently, they include:
+//
+// 	github.com/gopherjs/gopherjs/js
+// 	github.com/gopherjs/gopherjs/nosync
+//
+package gopherjspkg
+
+//go:generate vfsgendev -source="github.com/gopherjs/gopherjs/compiler/gopherjspkg".FS -tag=gopherjsdev
diff --git a/compiler/gopherjspkg/fs.go b/compiler/gopherjspkg/fs.go
new file mode 100644
index 000000000..f6fb2622d
--- /dev/null
+++ b/compiler/gopherjspkg/fs.go
@@ -0,0 +1,31 @@
+// +build gopherjsdev
+
+package gopherjspkg
+
+import (
+	"go/build"
+	"log"
+	"net/http"
+	"os"
+	pathpkg "path"
+
+	"github.com/shurcooL/httpfs/filter"
+)
+
+// FS is a virtual filesystem that contains core GopherJS packages.
+var FS = filter.Keep(
+	http.Dir(importPathToDir("github.com/gopherjs/gopherjs")),
+	func(path string, fi os.FileInfo) bool {
+		return path == "/" ||
+			path == "/js" || (pathpkg.Dir(path) == "/js" && !fi.IsDir()) ||
+			path == "/nosync" || (pathpkg.Dir(path) == "/nosync" && !fi.IsDir())
+	},
+)
+
+func importPathToDir(importPath string) string {
+	p, err := build.Import(importPath, "", build.FindOnly)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	return p.Dir
+}
diff --git a/compiler/gopherjspkg/fs_vfsdata.go b/compiler/gopherjspkg/fs_vfsdata.go
new file mode 100644
index 000000000..fde74dd82
--- /dev/null
+++ b/compiler/gopherjspkg/fs_vfsdata.go
@@ -0,0 +1,232 @@
+// Code generated by vfsgen; DO NOT EDIT.
+
+// +build !gopherjsdev
+
+package gopherjspkg
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	pathpkg "path"
+	"time"
+)
+
+// FS is a virtual filesystem that contains core GopherJS packages.
+var FS = func() http.FileSystem {
+	fs := vfsgen۰FS{
+		"/": &vfsgen۰DirInfo{
+			name:    "/",
+			modTime: time.Date(2018, 4, 20, 21, 15, 55, 808735181, time.UTC),
+		},
+		"/js": &vfsgen۰DirInfo{
+			name:    "js",
+			modTime: time.Date(2018, 4, 20, 21, 5, 10, 645618320, time.UTC),
+		},
+		"/js/js.go": &vfsgen۰CompressedFileInfo{
+			name:             "js.go",
+			modTime:          time.Date(2017, 10, 12, 19, 45, 13, 330964900, time.UTC),
+			uncompressedSize: 8002,
+
+			compressedContent: 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+		},
+		"/nosync": &vfsgen۰DirInfo{
+			name:    "nosync",
+			modTime: time.Date(2018, 4, 16, 1, 47, 43, 780377829, time.UTC),
+		},
+		"/nosync/map.go": &vfsgen۰CompressedFileInfo{
+			name:             "map.go",
+			modTime:          time.Date(2017, 10, 12, 19, 45, 13, 333389591, time.UTC),
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+			uncompressedSize: 2130,
+
+			compressedContent: []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x64\x55\x3f\x93\xdb\xc6\x0f\xad\x4f\x9f\x02\xbf\xea\x77\xca\xe8\x74\x49\xeb\x99\x2b\x32\x29\x1c\x37\x89\x8b\x74\x1e\x17\x10\x09\x8a\x88\x97\x0b\x06\xc0\x4a\xa2\x3d\xf7\xdd\x33\x58\xfe\x39\x39\xee\x44\xee\xf2\xe1\xe1\xbd\x07\x68\xc4\xe6\x0b\x9e\x09\xb2\xd8\x94\x9b\xdd\xee\xf9\x19\x7e\x85\x8f\x22\x09\xd8\x00\xc1\xc8\x41\x3a\x70\x1a\x46\x51\xd4\x09\xe4\xf4\x37\x35\x6e\xe0\x3d\x3a\x0c\x38\xc1\x89\x80\x73\xcb\x17\x6e\x0b\xa6\x34\x81\xe1\x85\x5a\xc0\xdc\x06\x94\x92\x2b\xd3\x85\xda\xe3\xee\xf9\xb9\x62\xe7\x09\xd8\x69\x00\x73\x51\x6a\x81\x33\x78\x4f\x73\xc1\x05\x4d\x69\x90\x0a\x51\x5c\x06\x74\x6e\x2a\x2c\x3a\x60\x9e\xc0\x79\x20\xb8\xb2\xf7\x52\x3c\xf0\xb2\x38\x77\xdc\xa0\xb3\xe4\x23\x7c\xe8\xde\xd0\x7a\x49\xad\xd5\x47\xc9\x69\x02\xa5\x8e\x94\x72\x43\x70\xed\x29\x8a\xb2\x41\x8f\xe3\x48\xd9\x0e\x71\x2b\xc0\x2a\xb1\x81\xcf\xbd\x07\x8f\x96\x30\x25\x69\xd0\xef\xd8\x6f\xca\x18\x76\x04\x9d\x28\x14\x23\x38\x4d\x30\x94\xe4\x3c\x26\x82\xb3\xa8\x14\xe7\x4c\x06\xc6\xf1\x16\x33\x49\xb1\x34\xad\x18\x81\xf0\x7f\x83\xb1\xe8\x28\x46\x81\xe5\x02\x0d\x36\x3d\xc1\x56\x0f\x4e\xc5\xa1\xe4\x62\xa1\x90\xd3\x60\xb5\x54\x42\x27\x05\xa5\x62\x74\x98\xc5\x4d\x4c\x17\xce\x67\x18\x95\xcc\x8a\x46\xab\xb5\xe3\x33\xea\x29\x4c\x6d\x24\x25\x6a\x5c\xf4\x08\x7f\x85\x5f\x6c\x07\xe0\xb0\xed\x0b\x59\xfc\x20\xb4\x09\x5c\x02\xec\x54\x38\xb5\x40\x5d\xc7\x0d\x53\xf6\xd0\x44\x09\xdb\xa7\xb9\x51\x25\x82\xc4\xe6\x76\x84\xdf\xe5\x4a\x17\xd2\x0a\xc4\x16\x06\x80\x15\x76\x3c\xa5\x59\x10\x4c\x29\xf0\xee\x3e\xd9\xac\x07\x1c\x47\x95\x51\x19\x9d\xaa\x70\xd2\x01\x6e\x92\xba\xc0\x80\x39\x68\x23\x9c\x55\xca\xf8\x7d\xf0\xaa\x0e\x81\x63\x9c\x28\x7b\x24\xad\xc7\x88\x10\x0e\x92\xcf\x11\x38\x18\xc5\x29\x3b\xd7\xbc\x54\x99\xda\xb0\xa6\x91\xdc\x14\x55\xca\x1e\x41\xa5\x91\x72\x4b\xb9\x86\xa7\x49\xd1\xaa\xcd\x34\x96\x41\x38\xce\x7c\x46\x95\x0b\xb7\x14\x23\x70\xc5\xd0\x28\xca\xa8\xf3\xd7\xcd\x25\x96\x0c\x72\x21\xed\x09\x6b\xd4\xb1\x51\x31\x8b\x16\xa6\x15\xf8\xae\x73\xba\xe1\x10\xf1\x90\x0e\xce\x22\xed\x8f\xdd\x2f\x83\xd0\x0d\xbe\x32\x39\xc0\xb5\xe7\xa6\x87\x01\x39\x3b\x72\x36\xc0\x00\x6b\xa7\x8c\xc3\x3c\x14\x4f\xc6\x5f\xa9\x9d\x47\xe9\x3f\x53\x5a\x7c\x2c\x0e\xa7\xd2\x75\xa4\x16\xee\xd3\x72\xcd\x1a\x4c\x64\x50\x72\x4b\x1a\x70\x49\xb0\x85\xc7\x3a\x13\x95\xfa\x5d\x7e\x51\x09\xb0\x71\xbe\x50\x9a\x60\x54\xce\xce\xf9\xbc\xaf\x4a\x5b\xaf\x9c\xbf\x58\x9d\xa5\x40\xf9\xa7\x30\x59\x43\xd9\xd7\x96\xff\x9c\xdb\x11\xef\x49\xa1\xc7\xdc\x1e\x00\xdf\x32\xb1\xf5\x14\xf6\x19\x8c\xa8\x3e\xab\x61\xbd\xa8\x3f\x25\x8e\xf9\x9f\x37\x0d\xb0\x2d\x73\x1e\xc7\x6b\xd0\x42\xbe\x1a\xb6\xaa\xdf\x01\x8c\x63\xb2\x6b\xc5\xc5\x12\x68\x85\xe6\x74\x6e\xc6\x5d\x29\x25\xe0\xca\xb7\x6e\xaf\x20\x8c\xca\x72\x84\x0f\x35\xca\x43\xe8\xb3\x4d\x40\x78\xde\xe3\x85\xc0\x4a\xd3\x6f\x6b\x8f\xc3\xc5\xa1\x1e\xf7\xc4\x0a\x72\xcd\xdf\xa5\xbd\xf6\xef\xd3\xb8\x2c\x21\x73\x2d\x8d\xc3\xb7\xdd\xc3\xac\xfe\xa7\xcf\x9c\x9d\xb4\xc3\x86\xbe\xbd\xee\x1e\xfe\xa0\x2b\x00\x74\x25\x37\x8f\x7b\xb8\x3f\x79\xad\x8b\xf8\x3d\x39\x18\xa5\x5a\x18\x33\xa0\x9e\xd8\xb7\x59\x80\x4e\x65\xd8\xd6\xdd\x61\x59\x9b\x75\xac\xd7\x93\x75\xdd\x1c\xaa\x67\x4a\x5e\x34\xd7\x0b\x2e\xf5\xc3\x08\x11\xe9\x71\x2d\x15\xfb\xb7\xe9\x25\xb6\x92\x0b\xf0\x39\x07\xe3\xb8\x37\x46\x2b\x01\xe1\x4a\xb1\x45\x3c\x4c\xa3\x61\xf4\xba\xd4\xe0\xb7\x0a\x63\x61\x5e\x49\xed\xac\xb9\x59\x19\xa8\x6e\x6c\xa5\x34\x0f\xcb\x89\xfc\x4a\x94\xe1\x82\xa9\x50\x98\x6e\x31\xa0\x2e\xf0\xb1\xf8\xfa\x7f\x11\xd5\x96\xf3\x99\xee\x3c\xc2\xef\x69\x0b\xd6\x87\xae\x72\xbd\xd6\x52\x35\x5e\x57\x36\x5a\x6e\x43\xe6\x99\xe8\x78\x0c\x69\xeb\x7a\xca\x4f\x99\xd3\xa1\x7e\xb4\x28\xb0\x16\x52\xb2\x92\x6a\xf0\x42\x88\xba\x47\xe3\xb3\xe3\x2e\x0c\x81\xc7\x11\x7e\x0a\xf1\xf6\xf1\xe9\xf7\xf6\x84\x9f\xdc\x41\xa2\xfc\x38\x1e\xab\xb1\x7b\x78\x79\x81\x9f\xe3\x7d\x1c\xcc\xd5\xff\xf7\x52\xe9\xc4\xbb\x87\x85\x5e\x3d\x78\xdc\xef\x1e\x1e\x5e\x77\xdb\xcb\xcc\x69\x17\xcf\x37\x78\xf7\x02\x0b\xde\xa7\x7b\xec\xa7\x5f\x3e\xef\x1e\x96\x07\x78\xbb\xf2\xee\x87\x3b\x0b\xe0\x6d\x89\x4f\xd5\xb5\x6d\x0d\x6e\xab\xe1\x61\xe4\x0f\xed\x7d\x2c\xfe\x78\xbb\x6f\x6f\xbf\xf4\x77\x8b\xa6\xd6\x16\x66\xec\x4a\xf4\x8d\x4a\xfd\xff\x6c\x57\x12\x07\xb8\xed\x77\xaf\xbb\x7f\x03\x00\x00\xff\xff\x07\xba\x3e\x57\x52\x08\x00\x00"),
+		},
+	}
+	fs["/"].(*vfsgen۰DirInfo).entries = []os.FileInfo{
+		fs["/js"].(os.FileInfo),
+		fs["/nosync"].(os.FileInfo),
+	}
+	fs["/js"].(*vfsgen۰DirInfo).entries = []os.FileInfo{
+		fs["/js/js.go"].(os.FileInfo),
+	}
+	fs["/nosync"].(*vfsgen۰DirInfo).entries = []os.FileInfo{
+		fs["/nosync/map.go"].(os.FileInfo),
+		fs["/nosync/mutex.go"].(os.FileInfo),
+		fs["/nosync/once.go"].(os.FileInfo),
+		fs["/nosync/pool.go"].(os.FileInfo),
+	}
+
+	return fs
+}()
+
+type vfsgen۰FS map[string]interface{}
+
+func (fs vfsgen۰FS) Open(path string) (http.File, error) {
+	path = pathpkg.Clean("/" + path)
+	f, ok := fs[path]
+	if !ok {
+		return nil, &os.PathError{Op: "open", Path: path, Err: os.ErrNotExist}
+	}
+
+	switch f := f.(type) {
+	case *vfsgen۰CompressedFileInfo:
+		gr, err := gzip.NewReader(bytes.NewReader(f.compressedContent))
+		if err != nil {
+			// This should never happen because we generate the gzip bytes such that they are always valid.
+			panic("unexpected error reading own gzip compressed bytes: " + err.Error())
+		}
+		return &vfsgen۰CompressedFile{
+			vfsgen۰CompressedFileInfo: f,
+			gr: gr,
+		}, nil
+	case *vfsgen۰DirInfo:
+		return &vfsgen۰Dir{
+			vfsgen۰DirInfo: f,
+		}, nil
+	default:
+		// This should never happen because we generate only the above types.
+		panic(fmt.Sprintf("unexpected type %T", f))
+	}
+}
+
+// vfsgen۰CompressedFileInfo is a static definition of a gzip compressed file.
+type vfsgen۰CompressedFileInfo struct {
+	name              string
+	modTime           time.Time
+	compressedContent []byte
+	uncompressedSize  int64
+}
+
+func (f *vfsgen۰CompressedFileInfo) Readdir(count int) ([]os.FileInfo, error) {
+	return nil, fmt.Errorf("cannot Readdir from file %s", f.name)
+}
+func (f *vfsgen۰CompressedFileInfo) Stat() (os.FileInfo, error) { return f, nil }
+
+func (f *vfsgen۰CompressedFileInfo) GzipBytes() []byte {
+	return f.compressedContent
+}
+
+func (f *vfsgen۰CompressedFileInfo) Name() string       { return f.name }
+func (f *vfsgen۰CompressedFileInfo) Size() int64        { return f.uncompressedSize }
+func (f *vfsgen۰CompressedFileInfo) Mode() os.FileMode  { return 0444 }
+func (f *vfsgen۰CompressedFileInfo) ModTime() time.Time { return f.modTime }
+func (f *vfsgen۰CompressedFileInfo) IsDir() bool        { return false }
+func (f *vfsgen۰CompressedFileInfo) Sys() interface{}   { return nil }
+
+// vfsgen۰CompressedFile is an opened compressedFile instance.
+type vfsgen۰CompressedFile struct {
+	*vfsgen۰CompressedFileInfo
+	gr      *gzip.Reader
+	grPos   int64 // Actual gr uncompressed position.
+	seekPos int64 // Seek uncompressed position.
+}
+
+func (f *vfsgen۰CompressedFile) Read(p []byte) (n int, err error) {
+	if f.grPos > f.seekPos {
+		// Rewind to beginning.
+		err = f.gr.Reset(bytes.NewReader(f.compressedContent))
+		if err != nil {
+			return 0, err
+		}
+		f.grPos = 0
+	}
+	if f.grPos < f.seekPos {
+		// Fast-forward.
+		_, err = io.CopyN(ioutil.Discard, f.gr, f.seekPos-f.grPos)
+		if err != nil {
+			return 0, err
+		}
+		f.grPos = f.seekPos
+	}
+	n, err = f.gr.Read(p)
+	f.grPos += int64(n)
+	f.seekPos = f.grPos
+	return n, err
+}
+func (f *vfsgen۰CompressedFile) Seek(offset int64, whence int) (int64, error) {
+	switch whence {
+	case io.SeekStart:
+		f.seekPos = 0 + offset
+	case io.SeekCurrent:
+		f.seekPos += offset
+	case io.SeekEnd:
+		f.seekPos = f.uncompressedSize + offset
+	default:
+		panic(fmt.Errorf("invalid whence value: %v", whence))
+	}
+	return f.seekPos, nil
+}
+func (f *vfsgen۰CompressedFile) Close() error {
+	return f.gr.Close()
+}
+
+// vfsgen۰DirInfo is a static definition of a directory.
+type vfsgen۰DirInfo struct {
+	name    string
+	modTime time.Time
+	entries []os.FileInfo
+}
+
+func (d *vfsgen۰DirInfo) Read([]byte) (int, error) {
+	return 0, fmt.Errorf("cannot Read from directory %s", d.name)
+}
+func (d *vfsgen۰DirInfo) Close() error               { return nil }
+func (d *vfsgen۰DirInfo) Stat() (os.FileInfo, error) { return d, nil }
+
+func (d *vfsgen۰DirInfo) Name() string       { return d.name }
+func (d *vfsgen۰DirInfo) Size() int64        { return 0 }
+func (d *vfsgen۰DirInfo) Mode() os.FileMode  { return 0755 | os.ModeDir }
+func (d *vfsgen۰DirInfo) ModTime() time.Time { return d.modTime }
+func (d *vfsgen۰DirInfo) IsDir() bool        { return true }
+func (d *vfsgen۰DirInfo) Sys() interface{}   { return nil }
+
+// vfsgen۰Dir is an opened dir instance.
+type vfsgen۰Dir struct {
+	*vfsgen۰DirInfo
+	pos int // Position within entries for Seek and Readdir.
+}
+
+func (d *vfsgen۰Dir) Seek(offset int64, whence int) (int64, error) {
+	if offset == 0 && whence == io.SeekStart {
+		d.pos = 0
+		return 0, nil
+	}
+	return 0, fmt.Errorf("unsupported Seek in directory %s", d.name)
+}
+
+func (d *vfsgen۰Dir) Readdir(count int) ([]os.FileInfo, error) {
+	if d.pos >= len(d.entries) && count > 0 {
+		return nil, io.EOF
+	}
+	if count <= 0 || count > len(d.entries)-d.pos {
+		count = len(d.entries) - d.pos
+	}
+	e := d.entries[d.pos : d.pos+count]
+	d.pos += count
+	return e, nil
+}
diff --git a/compiler/natives/fs.go b/compiler/natives/fs.go
index 57ceec8c5..13bbd3b53 100644
--- a/compiler/natives/fs.go
+++ b/compiler/natives/fs.go
@@ -12,14 +12,6 @@ import (
 	"github.com/shurcooL/httpfs/filter"
 )
 
-func importPathToDir(importPath string) string {
-	p, err := build.Import(importPath, "", build.FindOnly)
-	if err != nil {
-		log.Fatalln(err)
-	}
-	return p.Dir
-}
-
 // FS is a virtual filesystem that contains native packages.
 var FS = filter.Keep(
 	http.Dir(importPathToDir("github.com/gopherjs/gopherjs/compiler/natives")),
@@ -27,3 +19,11 @@ var FS = filter.Keep(
 		return path == "/" || path == "/src" || strings.HasPrefix(path, "/src/")
 	},
 )
+
+func importPathToDir(importPath string) string {
+	p, err := build.Import(importPath, "", build.FindOnly)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	return p.Dir
+}
diff --git a/compiler/typesutil/typesutil.go b/compiler/typesutil/typesutil.go
index fccb71f77..600925b81 100644
--- a/compiler/typesutil/typesutil.go
+++ b/compiler/typesutil/typesutil.go
@@ -1,12 +1,9 @@
 package typesutil
 
-import (
-	"go/types"
-	"strings"
-)
+import "go/types"
 
 func IsJsPackage(pkg *types.Package) bool {
-	return pkg != nil && (pkg.Path() == "github.com/gopherjs/gopherjs/js" || strings.HasSuffix(pkg.Path(), "/vendor/github.com/gopherjs/gopherjs/js"))
+	return pkg != nil && pkg.Path() == "github.com/gopherjs/gopherjs/js"
 }
 
 func IsJsObject(t types.Type) bool {
diff --git a/tests/gopherjsvendored_test.sh b/tests/gopherjsvendored_test.sh
new file mode 100755
index 000000000..a9ef4105f
--- /dev/null
+++ b/tests/gopherjsvendored_test.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# Don't run this file directly. It's executed as part of TestGopherJSCanBeVendored.
+
+set -e
+
+tmp=$(mktemp -d "${TMPDIR:-/tmp}/gopherjsvendored_test.XXXXXXXXXX")
+
+cleanup() {
+    rm -rf "$tmp"
+    exit
+}
+
+trap cleanup EXIT HUP INT TERM
+
+# copyGoPackage copies Go package with import path $1 to directory $2.
+# The target directory is created if it doesn't exist.
+copyGoPackage() {
+    mkdir -p "$2"
+    pkgDir=$(go list -f '{{.Dir}}' "$1")
+    # Copy all files (not directories), other than ones that start with "." or "_".
+    for f in $(find -H "$pkgDir" -maxdepth 1 -name "[^._]*" -type f); do
+        cp "$f" "$2"
+    done
+}
+
+# Make a hello project that will vendor GopherJS.
+mkdir -p "$tmp/src/example.org/hello"
+echo 'package main
+
+import "github.com/gopherjs/gopherjs/js"
+
+func main() {
+    js.Global.Get("console").Call("log", "hello using js pkg")
+}' > "$tmp/src/example.org/hello/main.go"
+
+# Vendor GopherJS and its dependencies into hello project.
+for pkg in $(go list -f '{{if not .Goroot}}{{.ImportPath}}{{end}}' $(go list -f '{{.ImportPath}} {{join .Deps " "}}' github.com/gopherjs/gopherjs)); do
+    copyGoPackage "$pkg" "$tmp/src/example.org/hello/vendor/$pkg"
+done
+
+# Make $tmp our GOPATH workspace.
+export GOPATH="$tmp"
+
+# Build the vendored copy of GopherJS.
+go install example.org/hello/vendor/github.com/gopherjs/gopherjs
+
+# Use it to build and run the hello command.
+(cd "$GOPATH/src/example.org/hello" && "$GOPATH/bin/gopherjs" run main.go)
diff --git a/tests/gorepo_test.go b/tests/gorepo_test.go
index 5496cd32e..957db3e9f 100644
--- a/tests/gorepo_test.go
+++ b/tests/gorepo_test.go
@@ -1,15 +1,18 @@
-// +build !js
-
 package tests_test
 
 import (
 	"os"
 	"os/exec"
+	"runtime"
 	"testing"
 )
 
 // Go repository basic compiler tests, and regression tests for fixed compiler bugs.
 func TestGoRepositoryCompilerTests(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
 	args := []string{"go", "run", "run.go", "-summary"}
 	if testing.Verbose() {
 		args = append(args, "-v")
@@ -22,3 +25,21 @@ func TestGoRepositoryCompilerTests(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// Test that GopherJS can be vendored into a project, and then used to build Go programs.
+// See issue https://github.com/gopherjs/gopherjs/issues/415.
+func TestGopherJSCanBeVendored(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
+	cmd := exec.Command("sh", "gopherjsvendored_test.sh")
+	cmd.Stderr = os.Stdout
+	got, err := cmd.Output()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if want := "hello using js pkg\n"; string(got) != want {
+		t.Errorf("unexpected stdout from gopherjsvendored_test.sh:\ngot:\n%s\nwant:\n%s", got, want)
+	}
+}
diff --git a/tests/lowlevel_test.go b/tests/lowlevel_test.go
index cc4a7d4b2..2d0e7fb9f 100644
--- a/tests/lowlevel_test.go
+++ b/tests/lowlevel_test.go
@@ -1,5 +1,3 @@
-// +build !js
-
 package tests_test
 
 import (
@@ -7,6 +5,7 @@ import (
 	"io/ioutil"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
@@ -15,6 +14,10 @@ import (
 //
 // See https://github.com/gopherjs/gopherjs/issues/279.
 func TestTimeInternalizationExternalization(t *testing.T) {
+	if runtime.GOARCH == "js" {
+		t.Skip("test meant to be run using normal Go compiler (needs os/exec)")
+	}
+
 	got, err := exec.Command("gopherjs", "run", filepath.Join("testdata", "time_inexternalization.go")).Output()
 	if err != nil {
 		t.Fatalf("%v:\n%s", err, got)
diff --git a/tool.go b/tool.go
index 8ac4df8cc..4c580a139 100644
--- a/tool.go
+++ b/tool.go
@@ -37,6 +37,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/crypto/ssh/terminal"
+	"golang.org/x/tools/go/buildutil"
 )
 
 var currentDirectory string
@@ -331,17 +332,17 @@ func main() {
 				}
 				s := gbuild.NewSession(options)
 
-				tests := &testFuncs{Package: pkg.Package}
+				tests := &testFuncs{BuildContext: s.BuildContext(), Package: pkg.Package}
 				collectTests := func(testPkg *gbuild.PackageData, testPkgName string, needVar *bool) error {
 					if testPkgName == "_test" {
 						for _, file := range pkg.TestGoFiles {
-							if err := tests.load(filepath.Join(pkg.Package.Dir, file), testPkgName, &tests.ImportTest, &tests.NeedTest); err != nil {
+							if err := tests.load(pkg.Package.Dir, file, testPkgName, &tests.ImportTest, &tests.NeedTest); err != nil {
 								return err
 							}
 						}
 					} else {
 						for _, file := range pkg.XTestGoFiles {
-							if err := tests.load(filepath.Join(pkg.Package.Dir, file), "_xtest", &tests.ImportXtest, &tests.NeedXtest); err != nil {
+							if err := tests.load(pkg.Package.Dir, file, "_xtest", &tests.ImportXtest, &tests.NeedXtest); err != nil {
 								return err
 							}
 						}
@@ -453,7 +454,7 @@ func main() {
 				}
 				status := "ok  "
 				start := time.Now()
-				if err := runNode(outfile.Name(), args, pkg.Dir, options.Quiet); err != nil {
+				if err := runNode(outfile.Name(), args, runTestDir(pkg), options.Quiet); err != nil {
 					if _, ok := err.(*exec.ExitError); !ok {
 						return err
 					}
@@ -740,6 +741,8 @@ func sprintError(err error) string {
 	}
 }
 
+// runNode runs script with args using Node.js in directory dir.
+// If dir is empty string, current directory is used.
 func runNode(script string, args []string, dir string, quiet bool) error {
 	var allArgs []string
 	if b, _ := strconv.ParseBool(os.Getenv("SOURCE_MAP_SUPPORT")); os.Getenv("SOURCE_MAP_SUPPORT") == "" || b {
@@ -790,16 +793,28 @@ func runNode(script string, args []string, dir string, quiet bool) error {
 	return err
 }
 
+// runTestDir returns the directory for Node.js to use when running tests for package p.
+// Empty string means current directory.
+func runTestDir(p *gbuild.PackageData) string {
+	if p.IsVirtual {
+		// The package is virtual and doesn't have a physical directory. Use current directory.
+		return ""
+	}
+	// Run tests in the package directory.
+	return p.Dir
+}
+
 type testFuncs struct {
-	Tests       []testFunc
-	Benchmarks  []testFunc
-	Examples    []testFunc
-	TestMain    *testFunc
-	Package     *build.Package
-	ImportTest  bool
-	NeedTest    bool
-	ImportXtest bool
-	NeedXtest   bool
+	BuildContext *build.Context
+	Tests        []testFunc
+	Benchmarks   []testFunc
+	Examples     []testFunc
+	TestMain     *testFunc
+	Package      *build.Package
+	ImportTest   bool
+	NeedTest     bool
+	ImportXtest  bool
+	NeedXtest    bool
 }
 
 type testFunc struct {
@@ -811,8 +826,8 @@ type testFunc struct {
 
 var testFileSet = token.NewFileSet()
 
-func (t *testFuncs) load(filename, pkg string, doImport, seen *bool) error {
-	f, err := parser.ParseFile(testFileSet, filename, nil, parser.ParseComments)
+func (t *testFuncs) load(dir, file, pkg string, doImport, seen *bool) error {
+	f, err := buildutil.ParseFile(testFileSet, t.BuildContext, nil, dir, file, parser.ParseComments)
 	if err != nil {
 		return err
 	}