It appears that the repository has undergone several changes and renamings:

backend/node_modules/supports-preserve-symlinks-flag/index.js

@@ -1,9 +0,0 @@
-'use strict';
-
-module.exports = (
-// node 12+
-	process.allowedNodeEnvironmentFlags && process.allowedNodeEnvironmentFlags.has('--preserve-symlinks')
-) || (
-// node v6.2 - v11
-	String(module.constructor._findPath).indexOf('preserveSymlinks') >= 0 // eslint-disable-line no-underscore-dangle
-);