add build test of 'latest' (#908)

Author: birkskyum

test/build/style-spec.test.ts

@@ -1,5 +1,6 @@
 import {readdir} from 'fs/promises';
 import {latest} from '../../src/reference/latest';
+import {latest as latestInBundle} from '../../dist/index';
 import fs from 'fs';
 import {describe, test, expect} from 'vitest';
 const minBundle = fs.readFileSync('dist/index.mjs', 'utf8');
@@ -37,4 +38,8 @@ describe('@maplibre/maplibre-gl-style-spec npm package', () => {
         expect(latest.$root.version.doc).toBeTruthy();
         expect(minBundle.includes(latest.$root.version.doc)).toBeFalsy();
     });
+
+    test('"latest" entry point should be defined', async () => {        
+        expect(latestInBundle).toBeDefined();
+    });
 });