vendor tsgo

tools/tsgo/internal/vfs/vfs_test.go

@@ -0,0 +1,65 @@
+package vfs_test
+
+import (
+	"testing"
+	"testing/fstest"
+
+	"github.com/microsoft/typescript-go/internal/repo"
+	"github.com/microsoft/typescript-go/internal/tspath"
+	"github.com/microsoft/typescript-go/internal/vfs"
+	"github.com/microsoft/typescript-go/internal/vfs/osvfs"
+	"github.com/microsoft/typescript-go/internal/vfs/vfstest"
+	"gotest.tools/v3/assert"
+)
+
+func BenchmarkReadFile(b *testing.B) {
+	type bench struct {
+		name string
+		fs   vfs.FS
+		path string
+	}
+
+	osFS := osvfs.FS()
+
+	const smallData = "hello, world"
+	tmpdir := tspath.NormalizeSlashes(b.TempDir())
+	osSmallDataPath := tspath.CombinePaths(tmpdir, "foo.ts")
+	err := osFS.WriteFile(osSmallDataPath, smallData)
+	assert.NilError(b, err)
+
+	tests := []bench{
+		{"MapFS small", vfstest.FromMap(fstest.MapFS{
+			"/foo.ts": &fstest.MapFile{
+				Data: []byte(smallData),
+			},
+		}, true), "/foo.ts"},
+		{"OS small", osFS, osSmallDataPath},
+	}
+
+	if repo.TypeScriptSubmoduleExists() {
+		checkerPath := tspath.CombinePaths(tspath.NormalizeSlashes(repo.TypeScriptSubmodulePath()), "src", "compiler", "checker.ts")
+
+		checkerContents, ok := osFS.ReadFile(checkerPath)
+		assert.Assert(b, ok)
+
+		tests = append(tests, bench{
+			"MapFS checker.ts",
+			vfstest.FromMap(fstest.MapFS{
+				"/checker.ts": &fstest.MapFile{
+					Data: []byte(checkerContents),
+				},
+			}, true),
+			"/checker.ts",
+		})
+		tests = append(tests, bench{"OS checker.ts", osFS, checkerPath})
+	}
+
+	for _, tt := range tests {
+		b.Run(tt.name, func(b *testing.B) {
+			b.ReportAllocs()
+			for range b.N {
+				_, _ = tt.fs.ReadFile(tt.path)
+			}
+		})
+	}
+}