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Commit 89f4b6c

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marco-ippolitomarco-ippolito
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module: remove --experimental-transform-types
PR-URL: #61803 Refs: nodejs/typescript#51 Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Jordan Harband <ljharb@gmail.com> Reviewed-By: Zeyu "Alex" Yang <himself65@outlook.com> Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Pietro Marchini <pietro.marchini94@gmail.com>
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‎benchmark/fixtures/transform-types-benchmark.js‎

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‎benchmark/fixtures/transform-types-benchmark.ts‎

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‎benchmark/ts/transform-typescript.js‎

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‎doc/api/cli.md‎

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@@ -1315,17 +1315,6 @@ Enable module mocking in the test runner.
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This feature requires `--allow-worker` if used with the [Permission Model][].
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### `--experimental-transform-types`
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<!-- YAML
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added: v22.7.0
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-->
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> Stability: 1.2 - Release candidate
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Enables the transformation of TypeScript-only syntax into JavaScript code.
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Implies `--enable-source-maps`.
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### `--experimental-vm-modules`
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<!-- YAML
@@ -3621,7 +3610,6 @@ one is included in the list below.
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* `--experimental-specifier-resolution`
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* `--experimental-test-isolation`
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* `--experimental-top-level-await`
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* `--experimental-transform-types`
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* `--experimental-vm-modules`
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* `--experimental-wasi-unstable-preview1`
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* `--force-context-aware`
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‎doc/api/module.md‎

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@@ -245,6 +245,10 @@ See [Customization hooks][].
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added:
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- v23.2.0
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- v22.13.0
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/61803
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description: Removed `transform` and `sourceMap` options.
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-->
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> Stability: 1.2 - Release candidate
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* `options` {Object}
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* `mode` {string} **Default:** `'strip'`. Possible values are:
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* `'strip'` Only strip type annotations without performing the transformation of TypeScript features.
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* `'transform'` Strip type annotations and transform TypeScript features to JavaScript.
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* `sourceMap` {boolean} **Default:** `false`. Only when `mode` is `'transform'`, if `true`, a source map
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will be generated for the transformed code.
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* `sourceUrl` {string} Specifies the source url used in the source map.
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* Returns: {string} The code with type annotations stripped.
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`module.stripTypeScriptTypes()` removes type annotations from TypeScript code. It
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By default, it will throw an error if the code contains TypeScript features
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that require transformation such as `Enums`,
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see [type-stripping][] for more information.
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When mode is `'transform'`, it also transforms TypeScript features to JavaScript,
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see [transform TypeScript features][] for more information.
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When mode is `'strip'`, source maps are not generated, because locations are preserved.
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If `sourceMap` is provided, when mode is `'strip'`, an error will be thrown.
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_WARNING_: The output of this function should not be considered stable across Node.js versions,
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due to changes in the TypeScript parser.
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// Prints: const a = 1\n\n//# sourceURL=source.ts;
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```
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When `mode` is `'transform'`, the code is transformed to JavaScript:
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```mjs
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import { stripTypeScriptTypes } from 'node:module';
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const code = `
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namespace MathUtil {
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export const add = (a: number, b: number) => a + b;
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}`;
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const strippedCode = stripTypeScriptTypes(code, { mode: 'transform', sourceMap: true });
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console.log(strippedCode);
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// Prints:
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// var MathUtil;
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// (function(MathUtil) {
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// MathUtil.add = (a, b)=>a + b;
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// })(MathUtil || (MathUtil = {}));
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// # sourceMappingURL=data:application/json;base64, ...
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```
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```cjs
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const { stripTypeScriptTypes } = require('node:module');
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const code = `
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namespace MathUtil {
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export const add = (a: number, b: number) => a + b;
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}`;
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const strippedCode = stripTypeScriptTypes(code, { mode: 'transform', sourceMap: true });
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console.log(strippedCode);
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// Prints:
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// var MathUtil;
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// (function(MathUtil) {
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// MathUtil.add = (a, b)=>a + b;
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// })(MathUtil || (MathUtil = {}));
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// # sourceMappingURL=data:application/json;base64, ...
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```
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### `module.syncBuiltinESMExports()`
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<!-- YAML
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[synchronous hook functions]: #hook-functions-accepted-by-moduleregisterhooks
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[the documentation of `Worker`]: worker_threads.md#new-workerfilename-options
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[transferable objects]: worker_threads.md#portpostmessagevalue-transferlist
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[transform TypeScript features]: typescript.md#typescript-features
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[type-stripping]: typescript.md#type-stripping
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‎doc/api/process.md‎

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- v23.0.0
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- v22.10.0
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/61803
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description: Removed `transform` value.
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- version:
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- v25.2.0
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- v24.12.0
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* Type: {boolean|string}
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A value that is `"strip"` by default,
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`"transform"` if Node.js is run with `--experimental-transform-types`, and `false` if
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A value that is `"strip"` by default, and `false` if
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Node.js is run with `--no-strip-types`.
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## `process.features.uv`
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‎doc/api/typescript.md‎

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<!-- YAML
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/61803
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description: Removed `--experimental-transform-types` flag.
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- version:
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- v25.2.0
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- v24.12.0
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erasable TypeScript syntax.
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Node.js will replace TypeScript syntax with whitespace,
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and no type checking is performed.
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To enable the transformation of non erasable TypeScript syntax, which requires JavaScript code generation,
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such as `enum` declarations, parameter properties use the flag [`--experimental-transform-types`][].
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To disable this feature, use the flag [`--no-strip-types`][].
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Node.js ignores `tsconfig.json` files and therefore
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### TypeScript features
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Since Node.js is only removing inline types, any TypeScript features that
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involve _replacing_ TypeScript syntax with new JavaScript syntax will error,
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unless the flag [`--experimental-transform-types`][] is passed.
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involve _replacing_ TypeScript syntax with new JavaScript syntax will error.
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The most prominent features that require transformation are:
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Since inline types are replaced by whitespace, source maps are unnecessary for
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correct line numbers in stack traces; and Node.js does not generate them.
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When [`--experimental-transform-types`][] is enabled, source-maps
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are enabled by default.
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### Type stripping in dependencies
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[CommonJS]: modules.md
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[ES Modules]: esm.md
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[Full TypeScript support]: #full-typescript-support
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[`--experimental-transform-types`]: cli.md#--experimental-transform-types
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[`--no-strip-types`]: cli.md#--no-strip-types
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[`ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX`]: errors.md#err_unsupported_typescript_syntax
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[`tsconfig` "paths"]: https://www.typescriptlang.org/tsconfig/#paths
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‎doc/api/util.md‎

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It is possible to reconstruct the original locations by setting the option `sourceMap` to `true`.
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If the source map is not available, the original location will be the same as the current location.
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When the `--enable-source-maps` flag is enabled, for example when using `--experimental-transform-types`,
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`sourceMap` will be true by default.
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When the `--enable-source-maps` flag is enabled,`sourceMap` will be true by default.
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```ts
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import { getCallSites } from 'node:util';
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‎doc/node-config-schema.json‎

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"type": "boolean",
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"description": "experimental node:sqlite module"
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},
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"experimental-transform-types": {
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"type": "boolean",
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"description": "enable transformation of TypeScript-onlysyntax into JavaScript code"
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},
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"experimental-vm-modules": {
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"type": "boolean",
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"description": "experimental ES Module support in vm module"
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‎doc/node.1‎

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@@ -741,10 +741,6 @@ collecting code coverage from tests for more details.
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Enable module mocking in the test runner.
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This feature requires \fB--allow-worker\fR if used with the Permission Model.
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.
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.It Fl -experimental-transform-types
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Enables the transformation of TypeScript-only syntax into JavaScript code.
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Implies \fB--enable-source-maps\fR.
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.
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.It Fl -experimental-vm-modules
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Enable experimental ES Module support in the \fBnode:vm\fR module.
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.
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.It
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\fB--experimental-top-level-await\fR
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.It
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\fB--experimental-transform-types\fR
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.It
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\fB--experimental-vm-modules\fR
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.It
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\fB--experimental-wasi-unstable-preview1\fR

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