feat: add support for nested types in subpath exports (#112)

Co-authored-by: Hiroki Osame <[email protected]>

Author: comp615

src/utils/parse-package-json/get-export-entries.ts

@@ -5,13 +5,20 @@ import { propertyNeedsQuotes } from '../property-needs-quotes.js';
 
 const getFileType = (
 	filePath: string,
-): PackageType | undefined => {
+): PackageType | 'types' | undefined => {
 	if (filePath.endsWith('.mjs')) {
 		return 'module';
 	}
 	if (filePath.endsWith('.cjs')) {
 		return 'commonjs';
 	}
+	if (
+		filePath.endsWith('.d.ts')
+		|| filePath.endsWith('.d.cts')
+		|| filePath.endsWith('.d.mts')
+	) {
+		return 'types';
+	}
 };
 
 const isPath = (filePath: string) => filePath.startsWith('.');

tests/specs/builds/package-exports.ts

@@ -109,6 +109,37 @@ export default testSuite(({ describe }, nodePath: string) => {
 			expect(utilsCjs).toMatch('exports.sayHello =');
 		});
 
+		test('conditions - types', async () => {
+			await using fixture = await createFixture({
+				...packageFixture({
+					installTypeScript: true,
+				}),
+				'package.json': createPackageJson({
+					type: 'module',
+					exports: {
+						types: {
+							default: './dist/mts.d.ts',
+						},
+						import: './dist/mts.js',
+					},
+				}),
+			});
+
+			const pkgrollProcess = await pkgroll([], {
+				cwd: fixture.path,
+				nodePath,
+			});
+
+			expect(pkgrollProcess.exitCode).toBe(0);
+			expect(pkgrollProcess.stderr).toBe('');
+
+			const indexMjs = await fixture.readFile('dist/mts.js', 'utf8');
+			expect(indexMjs).toMatch('function sayGoodbye(name) {');
+
+			const indexDts = await fixture.readFile('dist/mts.d.ts', 'utf8');
+			expect(indexDts).toMatch('declare function sayGoodbye(name: string): void;');
+		});
+
 		test('conditions - import should allow cjs', async () => {
 			await using fixture = await createFixture({
 				...packageFixture(),