vendor tsgo

tools/tsgo/internal/bundled/bundled.go

@@ -0,0 +1,53 @@
+// Package bundled provides access to files bundled with TypeScript.
+package bundled
+
+import (
+	"path/filepath"
+	"runtime"
+	"sync"
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/tspath"
+	"github.com/microsoft/typescript-go/internal/vfs"
+)
+
+//go:generate go run generate.go
+
+// Define the below here to consolidate documentation.
+
+// Embedded is true if the bundled files are implemented through an embedded FS.
+const Embedded = embedded
+
+// WrapFS returns an FS which redirects embedded paths to the embedded file system.
+// If the embedded file system is not available, it returns the original FS.
+func WrapFS(fs vfs.FS) vfs.FS {
+	return wrapFS(fs)
+}
+
+// LibPath returns the path to the directory containing the bundled lib.d.ts files.
+// If embedding is not enabled, this is a path on disk, and must be accessed through
+// a real OS filesystem.
+func LibPath() string {
+	return libPath()
+}
+
+var bundledSourceDir = sync.OnceValue(func() string {
+	_, filename, _, ok := runtime.Caller(0)
+	if !ok {
+		panic("bundled: could not get current filename")
+	}
+	return filepath.Dir(filepath.FromSlash(filename))
+})
+
+var testingLibPath = sync.OnceValue(func() string {
+	if !testing.Testing() {
+		panic("bundled: TestingLibPath should only be called during tests")
+	}
+	return tspath.NormalizeSlashes(filepath.Join(bundledSourceDir(), "libs"))
+})
+
+// TestingLibPath returns the path to the source bundled libs directory.
+// It's only valid to use in tests where the source code is available.
+func TestingLibPath() string {
+	return testingLibPath()
+}