module: unflag --experimental-strip-types

PR-URL: #56350
Fixes: nodejs/typescript#17
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Pietro Marchini <pietro.marchini94@gmail.com>

Author: marco-ippolito

benchmark/ts/strip-typescript.js

@@ -12,7 +12,7 @@ const bench = common.createBenchmark(main, {
   filepath: [ts, js],
   n: [1e4],
 }, {
-  flags: ['--experimental-strip-types', '--disable-warning=ExperimentalWarning'],
+  flags: ['--disable-warning=ExperimentalWarning'],
 });
 
 async function main({ n, filepath }) {

doc/api/cli.md

@@ -779,7 +779,7 @@ Any query parameter or hash in the URL will be accessible via [`import.meta.url`
 
 ```bash
 node --entry-url 'file:///path/to/file.js?queryparams=work#and-hashes-too'
-node --entry-url --experimental-strip-types 'file.ts?query#hash'
+node --entry-url 'file.ts?query#hash'
 node --entry-url 'data:text/javascript,console.log("Hello")'
 ```
 
@@ -879,8 +879,8 @@ On Windows, using `cmd.exe` a single quote will not work correctly because it
 only recognizes double `"` for quoting. In Powershell or Git bash, both `'`
 and `"` are usable.
 
-It is possible to run code containing inline types by passing
-[`--experimental-strip-types`][].
+It is possible to run code containing inline types unless the
+[`--no-experimental-strip-types`][] flag is provided.
 
 ### `--experimental-addon-modules`
 
@@ -1020,17 +1020,6 @@ added:
 
 Use this flag to enable [ShadowRealm][] support.
 
-### `--experimental-strip-types`
-
-<!-- YAML
-added: v22.6.0
--->
-
-> Stability: 1.1 - Active development
-
-Enable experimental type-stripping for TypeScript files.
-For more information, see the [TypeScript type-stripping][] documentation.
-
 ### `--experimental-test-coverage`
 
 <!-- YAML
@@ -1071,7 +1060,7 @@ added: v22.7.0
 > Stability: 1.1 - Active development
 
 Enables the transformation of TypeScript-only syntax into JavaScript code.
-Implies `--experimental-strip-types` and `--enable-source-maps`.
+Implies `--enable-source-maps`.
 
 ### `--experimental-vm-modules`
 
@@ -1382,10 +1371,10 @@ added: v12.0.0
 
 This configures Node.js to interpret `--eval` or `STDIN` input as CommonJS or
 as an ES module. Valid values are `"commonjs"`, `"module"`, `"module-typescript"` and `"commonjs-typescript"`.
-The `"-typescript"` values are available only in combination with the flag `--experimental-strip-types`.
+The `"-typescript"` values are not available with the flag `--no-experimental-strip-types`.
 The default is `"commonjs"`.
 
-If `--experimental-strip-types` is enabled and `--input-type` is not provided,
+If `--input-type` is not provided,
 Node.js will try to detect the syntax with the following steps:
 
 1. Run the input as CommonJS.
@@ -1660,6 +1649,21 @@ changes:
 
 Disable the experimental [`node:sqlite`][] module.
 
+### `--no-experimental-strip-types`
+
+<!-- YAML
+added: v22.6.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/56350
+    description: Type stripping is enabled by default.
+-->
+
+> Stability: 1.1 - Active development
+
+Disable experimental type-stripping for TypeScript files.
+For more information, see the [TypeScript type-stripping][] documentation.
+
 ### `--no-experimental-websocket`
 
 <!-- YAML
@@ -3087,7 +3091,6 @@ one is included in the list below.
 * `--experimental-require-module`
 * `--experimental-shadow-realm`
 * `--experimental-specifier-resolution`
-* `--experimental-strip-types`
 * `--experimental-test-isolation`
 * `--experimental-top-level-await`
 * `--experimental-transform-types`
@@ -3124,6 +3127,7 @@ one is included in the list below.
 * `--no-experimental-global-navigator`
 * `--no-experimental-repl-await`
 * `--no-experimental-sqlite`
+* `--no-experimental-strip-types`
 * `--no-experimental-websocket`
 * `--no-extra-info-on-fatal-exception`
 * `--no-force-async-hooks-checks`
@@ -3648,10 +3652,10 @@ node --stack-trace-limit=12 -p -e "Error.stackTraceLimit" # prints 12
 [`--env-file`]: #--env-fileconfig
 [`--experimental-addon-modules`]: #--experimental-addon-modules
 [`--experimental-sea-config`]: single-executable-applications.md#generating-single-executable-preparation-blobs
-[`--experimental-strip-types`]: #--experimental-strip-types
 [`--experimental-wasm-modules`]: #--experimental-wasm-modules
 [`--heap-prof-dir`]: #--heap-prof-dir
 [`--import`]: #--importmodule
+[`--no-experimental-strip-types`]: #--no-experimental-strip-types
 [`--openssl-config`]: #--openssl-configfile
 [`--preserve-symlinks`]: #--preserve-symlinks
 [`--print`]: #-p---print-script

doc/api/process.md

@@ -2021,8 +2021,9 @@ added: v23.0.0
 
 * {boolean|string}
 
-A value that is `"strip"` if Node.js is run with `--experimental-strip-types`,
-`"transform"` if Node.js is run with `--experimental-transform-types`, and `false` otherwise.
+A value that is `"strip"` by default,
+`"transform"` if Node.js is run with `--experimental-transform-types`, and `false` if
+Node.js is run with `--no-experimental-strip-types`.
 
 ## `process.features.uv`
 

doc/api/test.md

@@ -420,8 +420,8 @@ By default, Node.js will run all files matching these patterns:
 * `**/test.{cjs,mjs,js}`
 * `**/test/**/*.{cjs,mjs,js}`
 
-When [`--experimental-strip-types`][] is supplied, the following
-additional patterns are matched:
+Unless [`--no-experimental-strip-types`][] is supplied, the following
+additional patterns are also matched:
 
 * `**/*.test.{cts,mts,ts}`
 * `**/*-test.{cts,mts,ts}`
@@ -3589,10 +3589,10 @@ added:
 Can be used to abort test subtasks when the test has been aborted.
 
 [TAP]: https://testanything.org/
-[`--experimental-strip-types`]: cli.md#--experimental-strip-types
 [`--experimental-test-coverage`]: cli.md#--experimental-test-coverage
 [`--experimental-test-module-mocks`]: cli.md#--experimental-test-module-mocks
 [`--import`]: cli.md#--importmodule
+[`--no-experimental-strip-types`]: cli.md#--no-experimental-strip-types
 [`--test-concurrency`]: cli.md#--test-concurrency
 [`--test-coverage-exclude`]: cli.md#--test-coverage-exclude
 [`--test-coverage-include`]: cli.md#--test-coverage-include

doc/api/typescript.md

@@ -2,6 +2,9 @@
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/56350
+    description: Type stripping is enabled by default.
   - version: v22.7.0
     pr-url: https://github.com/nodejs/node/pull/54283
     description: Added `--experimental-transform-types` flag.
@@ -52,7 +55,7 @@ added: v22.6.0
 
 > Stability: 1.1 - Active development
 
-The flag [`--experimental-strip-types`][] enables Node.js to run TypeScript
+The flag [`--no-experimental-strip-types`][] prevents Node.js from running TypeScript
 files. By default Node.js will execute only files that contain no
 TypeScript features that require transformation, such as enums or namespaces.
 Node.js will replace inline type annotations with whitespace,
@@ -181,8 +184,8 @@ with `#`.
 [CommonJS]: modules.md
 [ES Modules]: esm.md
 [Full TypeScript support]: #full-typescript-support
-[`--experimental-strip-types`]: cli.md#--experimental-strip-types
 [`--experimental-transform-types`]: cli.md#--experimental-transform-types
+[`--no-experimental-strip-types`]: cli.md#--no-experimental-strip-types
 [`tsconfig` "paths"]: https://www.typescriptlang.org/tsconfig/#paths
 [`tsx`]: https://tsx.is/
 [`verbatimModuleSyntax`]: https://www.typescriptlang.org/tsconfig/#verbatimModuleSyntax

doc/node.1

@@ -186,9 +186,6 @@ Enable code coverage in the test runner.
 .It Fl -experimental-test-module-mocks
 Enable module mocking in the test runner.
 .
-.It Fl -experimental-strip-types
-Enable experimental type-stripping for TypeScript files.
-.
 .It Fl -experimental-transform-types
 Enable transformation of TypeScript-only syntax into JavaScript code.
 .
@@ -207,6 +204,9 @@ Disable top-level await keyword support in REPL.
 .It Fl -no-experimental-sqlite
 Disable the experimental node:sqlite module.
 .
+.It Fl -no-experimental-strip-types
+Disable experimental type-stripping for TypeScript files.
+.
 .It Fl -experimental-vm-modules
 Enable experimental ES module support in VM module.
 .

src/node_options.cc

@@ -856,7 +856,8 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   AddOption("--experimental-strip-types",
             "Experimental type-stripping for TypeScript files.",
             &EnvironmentOptions::experimental_strip_types,
-            kAllowedInEnvvar);
+            kAllowedInEnvvar,
+            true);
   AddOption("--experimental-transform-types",
             "enable transformation of TypeScript-only"
             "syntax into JavaScript code",

src/node_options.h

@@ -247,7 +247,7 @@ class EnvironmentOptions : public Options {
 
   std::vector<std::string> preload_esm_modules;
 
-  bool experimental_strip_types = false;
+  bool experimental_strip_types = true;
   bool experimental_transform_types = false;
 
   std::vector<std::string> user_argv;

test/es-module/test-esm-loader-entry-url.mjs

@@ -84,7 +84,7 @@ describe('--entry-url', { concurrency: true }, () => {
 
     for (const url of typescriptUrls) {
       await assertSpawnedProcess(
-        ['--entry-url', '--experimental-strip-types', fixtures.fileURL(url)],
+        ['--entry-url', fixtures.fileURL(url)],
         {},
         {
           ...experimentalFeatureWarning,

test/es-module/test-esm-resolve-type.mjs

@@ -186,7 +186,7 @@ try {
     [ 'qmod', 'index.js', 'imp.js', 'commonjs', 'module', 'module', '?k=v'],
     [ 'hmod', 'index.js', 'imp.js', 'commonjs', 'module', 'module', '#Key'],
     [ 'qhmod', 'index.js', 'imp.js', 'commonjs', 'module', 'module', '?k=v#h'],
-    [ 'ts-mod-com', 'index.js', 'imp.ts', 'module', 'commonjs', undefined],
+    [ 'ts-mod-com', 'index.js', 'imp.ts', 'module', 'commonjs', 'commonjs-typescript'],
   ].forEach((testVariant) => {
     const [
       moduleName,

test/es-module/test-typescript-commonjs.mjs

@@ -7,7 +7,6 @@ if (!process.config.variables.node_use_amaro) skip('Requires Amaro');
 
 test('require a .ts file with explicit extension succeeds', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--eval',
     'require("./test-typescript.ts")',
     '--no-warnings',
@@ -22,7 +21,6 @@ test('require a .ts file with explicit extension succeeds', async () => {
 
 test('eval require a .ts file with implicit extension fails', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--eval',
     'require("./test-typescript")',
     '--no-warnings',
@@ -37,7 +35,6 @@ test('eval require a .ts file with implicit extension fails', async () => {
 
 test('eval require a .cts file with implicit extension fails', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--eval',
     'require("./test-cts-typescript")',
     '--no-warnings',
@@ -52,7 +49,6 @@ test('eval require a .cts file with implicit extension fails', async () => {
 
 test('require a .ts file with implicit extension fails', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--no-warnings',
     fixtures.path('typescript/cts/test-extensionless-require.ts'),
   ]);
@@ -64,7 +60,6 @@ test('require a .ts file with implicit extension fails', async () => {
 
 test('expect failure of an .mts file with CommonJS syntax', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     fixtures.path('typescript/cts/test-cts-but-module-syntax.cts'),
   ]);
 
@@ -75,7 +70,6 @@ test('expect failure of an .mts file with CommonJS syntax', async () => {
 
 test('execute a .cts file importing a .cts file', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--no-warnings',
     fixtures.path('typescript/cts/test-require-commonjs.cts'),
   ]);
@@ -87,7 +81,6 @@ test('execute a .cts file importing a .cts file', async () => {
 
 test('execute a .cts file importing a .ts file export', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--no-warnings',
     fixtures.path('typescript/cts/test-require-ts-file.cts'),
   ]);
@@ -99,7 +92,6 @@ test('execute a .cts file importing a .ts file export', async () => {
 
 test('execute a .cts file importing a .mts file export', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--no-experimental-require-module',
     fixtures.path('typescript/cts/test-require-mts-module.cts'),
   ]);
@@ -111,7 +103,6 @@ test('execute a .cts file importing a .mts file export', async () => {
 
 test('execute a .cts file importing a .mts file export', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--experimental-require-module',
     fixtures.path('typescript/cts/test-require-mts-module.cts'),
   ]);
@@ -122,7 +113,6 @@ test('execute a .cts file importing a .mts file export', async () => {
 
 test('expect failure of a .cts file in node_modules', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     fixtures.path('typescript/cts/test-cts-node_modules.cts'),
   ]);
 
@@ -133,7 +123,6 @@ test('expect failure of a .cts file in node_modules', async () => {
 
 test('expect failure of a .ts file in node_modules', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     fixtures.path('typescript/cts/test-ts-node_modules.cts'),
   ]);
 
@@ -144,7 +133,6 @@ test('expect failure of a .ts file in node_modules', async () => {
 
 test('expect failure of a .cts requiring esm without default type module', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--no-experimental-require-module',
     fixtures.path('typescript/cts/test-mts-node_modules.cts'),
   ]);
@@ -156,7 +144,6 @@ test('expect failure of a .cts requiring esm without default type module', async
 
 test('expect failure of a .cts file requiring esm in node_modules', async () => {
   const result = await spawnPromisified(process.execPath, [
-    '--experimental-strip-types',
     '--experimental-require-module',
     fixtures.path('typescript/cts/test-mts-node_modules.cts'),
   ]);