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module: add module.stripTypeScriptTypes · nodejs/node@6575b76 · GitHub

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marco-ippolito
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ruyadorno
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module: add module.stripTypeScriptTypes
PR-URL: #55282 Backport-PR-URL: #56208 Fixes: #54300 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Chemi Atlow <chemi@atlow.co.il> Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
1 parent 0794861 commit 6575b76

10 files changed

Lines changed: 358 additions & 89 deletions

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‎doc/api/module.md‎

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@@ -270,6 +270,105 @@ changes:
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Register a module that exports [hooks][] that customize Node.js module
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resolution and loading behavior. See [Customization hooks][].
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273+
## `module.stripTypeScriptTypes(code[, options])`
274+
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<!-- YAML
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added: REPLACEME
277+
-->
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> Stability: 1.0 - Early development
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* `code` {string} The code to strip type annotations from.
282+
* `options` {Object}
283+
* `mode` {string} **Default:** `'strip'`. Possible values are:
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* `'strip'` Only strip type annotations without performing the transformation of TypeScript features.
285+
* `'transform'` Strip type annotations and transform TypeScript features to JavaScript.
286+
* `sourceMap` {boolean} **Default:** `false`. Only when `mode` is `'transform'`, if `true`, a source map
287+
will be generated for the transformed code.
288+
* `sourceUrl` {string} Specifies the source url used in the source map.
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* Returns: {string} The code with type annotations stripped.
290+
`module.stripTypeScriptTypes()` removes type annotations from TypeScript code. It
291+
can be used to strip type annotations from TypeScript code before running it
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with `vm.runInContext()` or `vm.compileFunction()`.
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By default, it will throw an error if the code contains TypeScript features
294+
that require transformation such as `Enums`,
295+
see [type-stripping][] for more information.
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When mode is `'transform'`, it also transforms TypeScript features to JavaScript,
297+
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,
302+
due to changes in the TypeScript parser.
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```mjs
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import { stripTypeScriptTypes } from 'node:module';
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const code = 'const a: number = 1;';
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const strippedCode = stripTypeScriptTypes(code);
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console.log(strippedCode);
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// Prints: const a = 1;
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```
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```cjs
313+
const { stripTypeScriptTypes } = require('node:module');
314+
const code = 'const a: number = 1;';
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const strippedCode = stripTypeScriptTypes(code);
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console.log(strippedCode);
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// Prints: const a = 1;
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```
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If `sourceUrl` is provided, it will be used appended as a comment at the end of the output:
321+
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```mjs
323+
import { stripTypeScriptTypes } from 'node:module';
324+
const code = 'const a: number = 1;';
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const strippedCode = stripTypeScriptTypes(code, { mode: 'strip', sourceUrl: 'source.ts' });
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console.log(strippedCode);
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// Prints: const a = 1\n\n//# sourceURL=source.ts;
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```
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```cjs
331+
const { stripTypeScriptTypes } = require('node:module');
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const code = 'const a: number = 1;';
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const strippedCode = stripTypeScriptTypes(code, { mode: 'strip', sourceUrl: 'source.ts' });
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console.log(strippedCode);
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// Prints: const a = 1\n\n//# sourceURL=source.ts;
336+
```
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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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}`;
346+
const strippedCode = stripTypeScriptTypes(code, { mode: 'transform', sourceMap: true });
347+
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, ...
354+
```
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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;
361+
}`;
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const strippedCode = stripTypeScriptTypes(code, { mode: 'transform', sourceMap: true });
363+
console.log(strippedCode);
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// Prints:
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// var MathUtil;
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// (function(MathUtil) {
367+
// MathUtil.add = (a, b)=>a + b;
368+
// })(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
@@ -1251,3 +1350,5 @@ returned object contains the following keys:
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[realm]: https://tc39.es/ecma262/#realm
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[source map include directives]: https://sourcemaps.info/spec.html#h.lmz475t4mvbx
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[transferrable 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

‎lib/internal/main/eval_string.js‎

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@@ -14,8 +14,8 @@ const {
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markBootstrapComplete,
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} = require('internal/process/pre_execution');
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const { evalModuleEntryPoint, evalScript } = require('internal/process/execution');
17-
const { addBuiltinLibsToObject, stripTypeScriptTypes } = require('internal/modules/helpers');
18-
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const { addBuiltinLibsToObject } = require('internal/modules/helpers');
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const { stripTypeScriptModuleTypes } = require('internal/modules/typescript');
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const { getOptionValue } = require('internal/options');
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prepareMainThreadExecution();
@@ -24,7 +24,7 @@ markBootstrapComplete();
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const code = getOptionValue('--eval');
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const source = getOptionValue('--experimental-strip-types') ?
27-
stripTypeScriptTypes(code) :
27+
stripTypeScriptModuleTypes(code) :
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code;
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const print = getOptionValue('--print');

‎lib/internal/modules/cjs/loader.js‎

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@@ -153,8 +153,8 @@ const {
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setHasStartedUserCJSExecution,
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stripBOM,
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toRealPath,
156-
stripTypeScriptTypes,
157156
} = require('internal/modules/helpers');
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const { stripTypeScriptModuleTypes } = require('internal/modules/typescript');
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const packageJsonReader = require('internal/modules/package_json_reader');
159159
const { getOptionValue, getEmbedderOptions } = require('internal/options');
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const shouldReportRequiredModules = getLazy(() => process.env.WATCH_REPORT_DEPENDENCIES);
@@ -1347,7 +1347,7 @@ let emittedRequireModuleWarning = false;
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function loadESMFromCJS(mod, filename) {
13481348
let source = getMaybeCachedSource(mod, filename);
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if (getOptionValue('--experimental-strip-types') && path.extname(filename) === '.mts') {
1350-
source = stripTypeScriptTypes(source, filename);
1350+
source = stripTypeScriptModuleTypes(source, filename);
13511351
}
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const cascadedLoader = require('internal/modules/esm/loader').getOrInitializeCascadedLoader();
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const isMain = mod[kIsMainSymbol];
@@ -1584,7 +1584,7 @@ function getMaybeCachedSource(mod, filename) {
15841584

15851585
function loadCTS(module, filename) {
15861586
const source = getMaybeCachedSource(module, filename);
1587-
const code = stripTypeScriptTypes(source, filename);
1587+
const code = stripTypeScriptModuleTypes(source, filename);
15881588
module._compile(code, filename, 'commonjs');
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}
15901590

@@ -1596,7 +1596,7 @@ function loadCTS(module, filename) {
15961596
function loadTS(module, filename) {
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// If already analyzed the source, then it will be cached.
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const source = getMaybeCachedSource(module, filename);
1599-
const content = stripTypeScriptTypes(source, filename);
1599+
const content = stripTypeScriptModuleTypes(source, filename);
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let format;
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const pkg = packageJsonReader.getNearestParentPackageJSON(filename);
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// Function require shouldn't be used in ES modules.
@@ -1616,7 +1616,7 @@ function loadTS(module, filename) {
16161616
if (Module._cache[parentPath]) {
16171617
let parentSource;
16181618
try {
1619-
parentSource = stripTypeScriptTypes(fs.readFileSync(parentPath, 'utf8'), parentPath);
1619+
parentSource = stripTypeScriptModuleTypes(fs.readFileSync(parentPath, 'utf8'), parentPath);
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} catch {
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// Continue regardless of error.
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}

‎lib/internal/modules/esm/get_format.js‎

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@@ -164,9 +164,10 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
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// Since experimental-strip-types depends on detect-module, we always return null
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// if source is undefined.
166166
if (!source) { return null; }
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const { stripTypeScriptTypes, stringify } = require('internal/modules/helpers');
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const { stringify } = require('internal/modules/helpers');
168+
const { stripTypeScriptModuleTypes } = require('internal/modules/typescript');
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const stringifiedSource = stringify(source);
169-
const parsedSource = stripTypeScriptTypes(stringifiedSource, fileURLToPath(url));
170+
const parsedSource = stripTypeScriptModuleTypes(stringifiedSource, fileURLToPath(url));
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const detectedFormat = detectModuleFormat(parsedSource, url);
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const format = `${detectedFormat}-typescript`;
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if (format === 'module-typescript' && foundPackageJson) {

‎lib/internal/modules/esm/translators.js‎

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@@ -30,10 +30,10 @@ const {
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assertBufferSource,
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loadBuiltinModule,
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stringify,
33-
stripTypeScriptTypes,
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stripBOM,
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urlToFilename,
3635
} = require('internal/modules/helpers');
36+
const { stripTypeScriptModuleTypes } = require('internal/modules/typescript');
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const {
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kIsCachedByESMLoader,
3939
Module: CJSModule,
@@ -244,7 +244,7 @@ translators.set('require-commonjs', (url, source, isMain) => {
244244
translators.set('require-commonjs-typescript', (url, source, isMain) => {
245245
emitExperimentalWarning('Type Stripping');
246246
assert(cjsParse);
247-
const code = stripTypeScriptTypes(stringify(source), url);
247+
const code = stripTypeScriptModuleTypes(stringify(source), url);
248248
return createCJSModuleWrap(url, code);
249249
});
250250

@@ -459,7 +459,7 @@ translators.set('wasm', async function(url, source) {
459459
translators.set('commonjs-typescript', function(url, source) {
460460
emitExperimentalWarning('Type Stripping');
461461
assertBufferSource(source, true, 'load');
462-
const code = stripTypeScriptTypes(stringify(source), url);
462+
const code = stripTypeScriptModuleTypes(stringify(source), url);
463463
debug(`Translating TypeScript ${url}`);
464464
return FunctionPrototypeCall(translators.get('commonjs'), this, url, code, false);
465465
});
@@ -468,7 +468,7 @@ translators.set('commonjs-typescript', function(url, source) {
468468
translators.set('module-typescript', function(url, source) {
469469
emitExperimentalWarning('Type Stripping');
470470
assertBufferSource(source, true, 'load');
471-
const code = stripTypeScriptTypes(stringify(source), url);
471+
const code = stripTypeScriptModuleTypes(stringify(source), url);
472472
debug(`Translating TypeScript ${url}`);
473473
return FunctionPrototypeCall(translators.get('module'), this, url, code, false);
474474
});

‎lib/internal/modules/helpers.js‎

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@@ -15,8 +15,6 @@ const {
1515
const {
1616
ERR_INVALID_ARG_TYPE,
1717
ERR_INVALID_RETURN_PROPERTY_VALUE,
18-
ERR_INVALID_TYPESCRIPT_SYNTAX,
19-
ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING,
2018
} = require('internal/errors').codes;
2119
const { BuiltinModule } = require('internal/bootstrap/realm');
2220

@@ -27,9 +25,8 @@ const path = require('path');
2725
const { pathToFileURL, fileURLToPath } = require('internal/url');
2826
const assert = require('internal/assert');
2927

30-
const { Buffer } = require('buffer');
3128
const { getOptionValue } = require('internal/options');
32-
const { assertTypeScript, setOwnProperty, getLazy, isUnderNodeModules } = require('internal/util');
29+
const { setOwnProperty, getLazy } = require('internal/util');
3330
const { inspect } = require('internal/util/inspect');
3431

3532
const lazyTmpdir = getLazy(() => require('os').tmpdir());
@@ -314,75 +311,6 @@ function getBuiltinModule(id) {
314311
return normalizedId ? require(normalizedId) : undefined;
315312
}
316313

317-
/**
318-
* The TypeScript parsing mode, either 'strip-only' or 'transform'.
319-
* @type {string}
320-
*/
321-
const getTypeScriptParsingMode = getLazy(() =>
322-
(getOptionValue('--experimental-transform-types') ? 'transform' : 'strip-only'),
323-
);
324-
325-
/**
326-
* Load the TypeScript parser.
327-
* and returns an object with a `code` property.
328-
* @returns {Function} The TypeScript parser function.
329-
*/
330-
const loadTypeScriptParser = getLazy(() => {
331-
assertTypeScript();
332-
const amaro = require('internal/deps/amaro/dist/index');
333-
return amaro.transformSync;
334-
});
335-
336-
/**
337-
*
338-
* @param {string} source the source code
339-
* @param {object} options the options to pass to the parser
340-
* @returns {TransformOutput} an object with a `code` property.
341-
*/
342-
function parseTypeScript(source, options) {
343-
const parse = loadTypeScriptParser();
344-
try {
345-
return parse(source, options);
346-
} catch (error) {
347-
throw new ERR_INVALID_TYPESCRIPT_SYNTAX(error);
348-
}
349-
}
350-
351-
/**
352-
* @typedef {object} TransformOutput
353-
* @property {string} code The compiled code.
354-
* @property {string} [map] The source maps (optional).
355-
*
356-
* Performs type-stripping to TypeScript source code.
357-
* @param {string} source TypeScript code to parse.
358-
* @param {string} filename The filename of the source code.
359-
* @returns {TransformOutput} The stripped TypeScript code.
360-
*/
361-
function stripTypeScriptTypes(source, filename) {
362-
if (isUnderNodeModules(filename)) {
363-
throw new ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING(filename);
364-
}
365-
assert(typeof source === 'string');
366-
const options = {
367-
__proto__: null,
368-
mode: getTypeScriptParsingMode(),
369-
sourceMap: getOptionValue('--enable-source-maps'),
370-
filename,
371-
};
372-
const { code, map } = parseTypeScript(source, options);
373-
if (map) {
374-
// TODO(@marco-ippolito) When Buffer.transcode supports utf8 to
375-
// base64 transformation, we should change this line.
376-
const base64SourceMap = Buffer.from(map).toString('base64');
377-
return `${code}\n\n//# sourceMappingURL=data:application/json;base64,${base64SourceMap}`;
378-
}
379-
// Source map is not necessary in strip-only mode. However, to map the source
380-
// file in debuggers to the original TypeScript source, add a sourceURL magic
381-
// comment to hint that it is a generated source.
382-
return `${code}\n\n//# sourceURL=${filename}`;
383-
}
384-
385-
386314
/**
387315
* Enable on-disk compiled cache for all user modules being complied in the current Node.js instance
388316
* after this method is called.
@@ -485,7 +413,6 @@ module.exports = {
485413
loadBuiltinModule,
486414
makeRequireFunction,
487415
normalizeReferrerURL,
488-
stripTypeScriptTypes,
489416
stringify,
490417
stripBOM,
491418
toRealPath,

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