fs: re-export constants from fs/promises

Author: F3n67u

lib/fs/promises.js

@@ -1,3 +1,5 @@
 'use strict';
 
-module.exports = require('internal/fs/promises').exports;
+const dnsPromises = require('internal/fs/promises').exports;
+dnsPromises.constants = require('fs').constants;
+module.exports = dnsPromises;

test/parallel/test-fs-promises-exists.js

@@ -4,3 +4,4 @@ require('../common');
 const assert = require('assert');
 
 assert.strictEqual(require('fs/promises'), require('fs').promises);
+assert.strictEqual(require('fs/promises').constants, require('fs').constants);