Fix TypeScript type resolution to close #2317 (#2338)

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: mathiasrw <[email protected]>
Co-authored-by: M. Wulff <[email protected]>

Author: Copilot

package.json

@@ -10,6 +10,7 @@
 	"browser": "dist/alasql.min.js",
 	"exports": {
 		".": {
+			"types": "./types/alasql.d.ts",
 			"node": "./dist/alasql.fs.js",
 			"browser": "./dist/alasql.min.js",
 			"default": "./dist/alasql.fs.js"

test/test2317.js

@@ -0,0 +1,42 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+	var fs = require('fs');
+	var path = require('path');
+}
+
+describe('Test 2317 - TypeScript type resolution via exports map', function () {
+	const test = '2317'; // insert test file number
+
+	it('A) package.json should have types in exports map', function () {
+		// Read package.json
+		const packageJsonPath = path.join(__dirname, '..', 'package.json');
+		const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+
+		// Verify exports field exists
+		assert.ok(packageJson.exports, 'package.json should have exports field');
+
+		// Verify main export has types field
+		assert.ok(packageJson.exports['.'], 'package.json exports should have "." entry');
+		assert.ok(packageJson.exports['.'].types, 'package.json exports["."] should have types field');
+
+		// Verify types field points to correct file
+		assert.strictEqual(
+			packageJson.exports['.'].types,
+			'./types/alasql.d.ts',
+			'types field should point to ./types/alasql.d.ts'
+		);
+	});
+
+	it('B) types file should exist', function () {
+		// Verify the types file actually exists
+		const typesFilePath = path.join(__dirname, '..', 'types', 'alasql.d.ts');
+		assert.ok(fs.existsSync(typesFilePath), 'types/alasql.d.ts should exist');
+	});
+
+	it('C) alasql import should work (runtime verification)', function () {
+		// Basic runtime check that alasql still works
+		var res = alasql('SELECT 1 as one');
+		assert.deepEqual(res, [{one: 1}]);
+	});
+});