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process: add `process.features.typescript` · nodejs/node@4050f68 · GitHub

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process: add process.features.typescript
PR-URL: #54295 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
1 parent 8eae0d3 commit 4050f68

4 files changed

Lines changed: 80 additions & 14 deletions

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‎doc/api/process.md‎

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@@ -1968,6 +1968,19 @@ added: v0.5.3
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A boolean value that is `true` if the current Node.js build includes support for SNI in TLS.
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## `process.features.typescript`
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<!-- YAML
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added: REPLACEME
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-->
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> Stability: 1.0 - Early development
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* {boolean|string}
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A value that is `"strip"` if Node.js is run with `--experimental-strip-types`,
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`"transform"` if Node.js is run with `--experimental-transform-types`, and `false` otherwise.
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## `process.features.uv`
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<!-- YAML

‎lib/internal/bootstrap/node.js‎

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@@ -319,6 +319,29 @@ ObjectDefineProperty(process, 'features', {
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}
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const { emitWarning, emitWarningSync } = require('internal/process/warning');
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const { getOptionValue } = require('internal/options');
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let kTypeStrippingMode = null;
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// This must be a getter, as getOptionValue does not work
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// before bootstrapping.
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ObjectDefineProperty(process.features, 'typescript', {
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__proto__: null,
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get() {
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if (kTypeStrippingMode === null) {
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if (getOptionValue('--experimental-transform-types')) {
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kTypeStrippingMode = 'transform';
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} else if (getOptionValue('--experimental-strip-types')) {
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kTypeStrippingMode = 'strip';
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} else {
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kTypeStrippingMode = false;
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}
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}
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return kTypeStrippingMode;
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},
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configurable: true,
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enumerable: true,
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});
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process.emitWarning = emitWarning;
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internalBinding('process_methods').setEmitWarningSync(emitWarningSync);
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‎test/es-module/test-typescript.mjs‎

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@@ -354,6 +354,34 @@ test('execute a TypeScript test mocking module', { skip: isWindows && process.ar
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strictEqual(result.code, 0);
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});
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test('expect process.features.typescript to be \'strip\' when --experimental-strip-types', async () => {
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const result = await spawnPromisified(process.execPath, [
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'--no-warnings',
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'--experimental-strip-types',
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'-p', 'process.features.typescript',
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]);
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strictEqual(result.stderr, '');
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strictEqual(result.stdout, 'strip\n');
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strictEqual(result.code, 0);
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});
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test('expect process.features.typescript to be \'transform\' when --experimental-transform-types', async () => {
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const result = await spawnPromisified(process.execPath, [
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'--no-warnings',
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'--experimental-transform-types',
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'-p', 'process.features.typescript',
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]);
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strictEqual(result.stderr, '');
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strictEqual(result.stdout, 'transform\n');
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strictEqual(result.code, 0);
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});
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test('expect process.features.typescript to be false without type-stripping', async () => {
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strictEqual(process.features.typescript, false);
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});
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test('execute a TypeScript file with union types', async () => {
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const result = await spawnPromisified(process.execPath, [
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'--experimental-strip-types',

‎test/parallel/test-process-features.js‎

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require('../common');
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const assert = require('assert');
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const keys = new Set(Object.keys(process.features));
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const actualKeys = new Set(Object.keys(process.features));
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const expectedKeys = new Map([
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['inspector', ['boolean']],
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['debug', ['boolean']],
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['uv', ['boolean']],
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['ipv6', ['boolean']],
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['tls_alpn', ['boolean']],
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['tls_sni', ['boolean']],
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['tls_ocsp', ['boolean']],
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['tls', ['boolean']],
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['cached_builtins', ['boolean']],
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['typescript', ['boolean', 'string']],
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]);
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assert.deepStrictEqual(keys, new Set([
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'inspector',
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'debug',
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'uv',
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'ipv6',
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'tls_alpn',
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'tls_sni',
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'tls_ocsp',
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'tls',
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'cached_builtins',
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]));
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assert.deepStrictEqual(actualKeys, new Set(expectedKeys.keys()));
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for (const key of keys) {
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assert.strictEqual(typeof process.features[key], 'boolean');
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for (const [key, expected] of expectedKeys) {
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assert.ok(expected.includes(typeof process.features[key]), `typeof process.features.${key} is not one of [${expected.join(', ')}]`);
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}

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