fixup! module: add --experimental-strip-private-modules

Author: marco-ippolito

doc/api/packages.md

@@ -1371,9 +1371,12 @@ By default, Node.js refuses to strip types from TypeScript files inside
 `node_modules`. When [`--experimental-strip-private-modules`][] is enabled,
 Node.js allows type stripping for:
 
-* files that are not descendant of a `node_modules` directory.
-* files that are descendant of a directory whose parent is a `node_modules` directory
-  and that contains a `package.json` file that sets `"private": true`.
+* files that are not inside a `node_modules` directory.
+* files inside `node_modules`, but only when the package that contains the
+  file sets `"private": true`. Only the `package.json` at each package boundary
+  is considered: the package's root directory, which is the directory directly
+  under `node_modules` (or under `node_modules/<@scope>` for scoped packages).
+  Nested `package.json` files are ignored.
 
 [CommonJS]: modules.md
 [Conditional exports]: #conditional-exports

test/es-module/test-typescript.mjs

@@ -73,6 +73,19 @@ test('execute a TypeScript file from a private package in node_modules', async (
   assert.strictEqual(result.code, 0);
 });
 
+test('execute a TypeScript file from a private package with a non-private nested package.json',
+     async () => {
+       const result = await spawnPromisified(process.execPath, [
+         '--experimental-strip-private-modules',
+         '--no-warnings',
+         fixtures.path('typescript/ts/test-typescript-nested-nonprivate-node-modules.ts'),
+       ]);
+
+       assert.strictEqual(result.stderr, '');
+       assert.match(result.stdout, /Hello, TypeScript!/);
+       assert.strictEqual(result.code, 0);
+     });
+
 test('emit an experimental warning when stripping types in a private node_modules package',
      async () => {
        const result = await spawnPromisified(process.execPath, [

test/fixtures/typescript/ts/node_modules/nested-nonprivate-pkg/lib/index.ts

@@ -0,0 +1,3 @@
+import { baz } from 'nested-nonprivate-pkg';
+
+console.log(baz);