Enable type stripping by default

internal/cmd/runtime_options.go

@@ -23,10 +23,9 @@ func runtimeOptionFlagSet(includeSysEnv bool) *pflag.FlagSet {
 	flags.SortFlags = false
 	flags.Bool("include-system-env-vars", includeSysEnv, "pass the real system environment variables to the runtime")
 	flags.String("compatibility-mode", "extended",
-		`JavaScript compiler compatibility mode, "extended" or "base" or "experimental_enhanced"
+		`JavaScript compiler compatibility mode, "extended" or "base"
 base: pure Sobek - Golang JS VM supporting ES6+
 extended: base + sets "global" as alias for "globalThis"
-experimental_enhanced: esbuild-based transpiling for TypeScript and ES6+ support
 `)
 	flags.StringP("type", "t", "", "override test type, \"js\" or \"archive\"")
 	flags.StringArrayP("env", "e", nil, "add/override environment variable with `VAR=value`")

internal/cmd/test_load.go

@@ -67,6 +67,12 @@ func loadLocalTest(gs *state.GlobalState, cmd *cobra.Command, args []string) (*l
 		return nil, err
 	}
 
+	if runtimeOptions.CompatibilityMode.String == lib.CompatibilityModeExperimentalEnhanced.String() {
+		gs.Logger.Warnf("ComaptibilityMode %[1]q is deprecated. Types are stripped by default for `.ts` files. "+
+			"Please move to using %[2]q instead as %[1]q will be removed in the future",
+			lib.CompatibilityModeExperimentalEnhanced.String(), lib.CompatibilityModeBase.String())
+	}
+
 	registry := metrics.NewRegistry()
 	state := &lib.TestPreInitState{
 		Logger:         gs.Logger,

internal/cmd/tests/cmd_run_test.go

@@ -2394,7 +2394,7 @@ func TestTypeScriptSupport(t *testing.T) {
 	require.NoError(t, fsext.WriteFile(ts.FS, filepath.Join(ts.Cwd, "test.ts"), []byte(mainScript), 0o644))
 	require.NoError(t, fsext.WriteFile(ts.FS, filepath.Join(ts.Cwd, "bar.ts"), []byte(depScript), 0o644))
 
-	ts.CmdArgs = []string{"k6", "run", "--compatibility-mode", "experimental_enhanced", "--quiet", "test.ts"}
+	ts.CmdArgs = []string{"k6", "run", "--quiet", "test.ts"}
 
 	cmd.ExecuteWithGlobalState(ts.GlobalState)
 

internal/js/compiler/compiler.go

@@ -119,7 +119,7 @@ func (ps *parsingState) parseImpl(src, filename string, commonJSWrap bool) (*ast
 		return prg, code, nil
 	}
 
-	if ps.compatibilityMode == lib.CompatibilityModeExperimentalEnhanced && strings.HasSuffix(filename, ".ts") {
+	if strings.HasSuffix(filename, ".ts") {
 		if err := ps.compiler.usage.Uint64(usageParsedTSFilesKey, 1); err != nil {
 			ps.compiler.logger.WithError(err).Warn("couldn't report usage for " + usageParsedTSFilesKey)
 		}

internal/js/compiler/enhanced_test.go

@@ -9,7 +9,6 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"go.k6.io/k6/internal/lib/testutils"
-	"go.k6.io/k6/lib"
 )
 
 func Test_esbuildTransform_js(t *testing.T) {
@@ -41,15 +40,13 @@ func TestCompile_experimental_enhanced(t *testing.T) {
 		t.Parallel()
 		c := New(testutils.NewLogger(t))
 		src := `1+(function() { return 2; )()`
-		c.Options.CompatibilityMode = lib.CompatibilityModeExperimentalEnhanced
 		_, _, err := c.Parse(src, "script.ts", false, false)
 		assert.IsType(t, &parser.Error{}, err)
 		assert.Contains(t, err.Error(), `script.ts: Line 1:26 Unexpected ")"`)
 	})
 	t.Run("experimental_enhanced", func(t *testing.T) {
 		t.Parallel()
 		c := New(testutils.NewLogger(t))
-		c.Options.CompatibilityMode = lib.CompatibilityModeExperimentalEnhanced
 		prg, code, err := c.Parse(`let t :string = "something"; require(t);`, "script.ts", false, false)
 		require.NoError(t, err)
 		assert.Equal(t, `let t = "something";
@@ -70,7 +67,6 @@ require(t);
 	t.Run("experimental_enhanced sourcemap", func(t *testing.T) {
 		t.Parallel()
 		c := New(testutils.NewLogger(t))
-		c.Options.CompatibilityMode = lib.CompatibilityModeExperimentalEnhanced
 		c.Options.SourceMapLoader = func(_ string) ([]byte, error) { return nil, nil }
 		_, code, err := c.Parse(`let t :string = "something"; require(t);`, "script.ts", false, false)
 		require.NoError(t, err)