module: unflag --experimental-strip-types

PR-URL: #56350
Backport-PR-URL: #57298
Fixes: nodejs/typescript#17
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Paolo Insogna <[email protected]>
Reviewed-By: Pietro Marchini <[email protected]>

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

@@ -777,7 +777,7 @@ 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-async-context-frame`
 
@@ -1119,17 +1119,6 @@ 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
@@ -1189,7 +1178,7 @@ 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`
 
@@ -1497,9 +1486,10 @@ 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 default is `"commonjs"` unless [`--experimental-default-type=module`][] is used.
-If `--experimental-strip-types` is enabled and `--input-type` is not provided,
+The `"-typescript"` values are not available with the flag `--no-experimental-strip-types`.
+The default is `"commonjs"`.
+
+If `--input-type` is not provided,
 Node.js will try to detect the syntax with the following steps:
 
 1. Run the input as CommonJS.
@@ -1794,6 +1784,21 @@ 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
@@ -3297,7 +3302,6 @@ one is included in the list below.
 * `--experimental-require-module`
 * `--experimental-shadow-realm`
 * `--experimental-specifier-resolution`
-* `--experimental-strip-types`
 * `--experimental-top-level-await`
 * `--experimental-transform-types`
 * `--experimental-vm-modules`
@@ -3336,6 +3340,7 @@ one is included in the list below.
 * `--no-experimental-global-webcrypto`
 * `--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`
@@ -3870,10 +3875,10 @@ node --stack-trace-limit=12 -p -e "Error.stackTraceLimit" # prints 12
 [`--env-file`]: #--env-fileconfig
 [`--experimental-default-type=module`]: #--experimental-default-typetype
 [`--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

@@ -2067,8 +2067,9 @@ added: v22.10.0
 
 * {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}`
@@ -3689,10 +3689,10 @@ Can be used to abort test subtasks when the test has been aborted.
 
 [TAP]: https://testanything.org/
 [TTY]: tty.md
-[`--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-include`]: cli.md#--test-coverage-include
 [`--test-name-pattern`]: cli.md#--test-name-pattern

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 @@ To use TypeScript with full support for all TypeScript features, including
 added: v22.6.0
 -->
 
-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.
 Node.js will replace inline type annotations with whitespace,
@@ -206,8 +209,8 @@ 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
 [`ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX`]: errors.md#err_unsupported_typescript_syntax
 [`tsconfig` "paths"]: https://www.typescriptlang.org/tsconfig/#paths
 [`tsx`]: https://tsx.is/

doc/node.1

@@ -197,9 +197,6 @@ Configures the type of test isolation used 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.
 .
@@ -227,6 +224,9 @@ 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

@@ -899,7 +899,8 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   AddOption("--experimental-strip-types",
             "Experimental type-stripping for TypeScript files.",
             &EnvironmentOptions::experimental_strip_types,
-            kAllowedInEnvvar);
+            kAllowedInEnvvar,
+            true);
   Implies("--experimental-strip-types", "--experimental-detect-module");
 
   AddOption("--experimental-transform-types",

src/node_options.h

@@ -251,7 +251,7 @@ 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

@@ -188,7 +188,7 @@ 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,