fs: fix (temporary) for esm package

Fix to unblock CITGM. See,
standard-things/esm#821.

PR-URL: #28957
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/internal/fs/utils.js

@@ -345,6 +345,10 @@ function Stats(dev, mode, nlink, uid, gid, rdev, blksize,
 Object.setPrototypeOf(Stats.prototype, StatsBase.prototype);
 Object.setPrototypeOf(Stats, StatsBase);
 
+// HACK: Workaround for https://github.com/standard-things/esm/issues/821.
+// TODO(ronag): Remove this as soon as `esm` publishes a fixed version.
+Stats.prototype.isFile = StatsBase.prototype.isFile;
+
 Stats.prototype._checkModeProperty = function(property) {
   if (isWindows && (property === S_IFIFO || property === S_IFBLK ||
     property === S_IFSOCK)) {