Index: frontend/node_modules/dotenv-expand/lib/main.js
===================================================================
--- frontend/node_modules/dotenv-expand/lib/main.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/dotenv-expand/lib/main.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,46 @@
+'use strict'
+
+var dotenvExpand = function (config) {
+  // if ignoring process.env, use a blank object
+  var environment = config.ignoreProcessEnv ? {} : process.env
+
+  var interpolate = function (envValue) {
+    var matches = envValue.match(/(.?\${?(?:[a-zA-Z0-9_]+)?}?)/g) || []
+
+    return matches.reduce(function (newEnv, match) {
+      var parts = /(.?)\${?([a-zA-Z0-9_]+)?}?/g.exec(match)
+      var prefix = parts[1]
+
+      var value, replacePart
+
+      if (prefix === '\\') {
+        replacePart = parts[0]
+        value = replacePart.replace('\\$', '$')
+      } else {
+        var key = parts[2]
+        replacePart = parts[0].substring(prefix.length)
+        // process.env value 'wins' over .env file's value
+        value = environment.hasOwnProperty(key) ? environment[key] : (config.parsed[key] || '')
+
+        // Resolve recursive interpolations
+        value = interpolate(value)
+      }
+
+      return newEnv.replace(replacePart, value)
+    }, envValue)
+  }
+
+  for (var configKey in config.parsed) {
+    var value = environment.hasOwnProperty(configKey) ? environment[configKey] : config.parsed[configKey]
+
+    config.parsed[configKey] = interpolate(value)
+  }
+
+  for (var processKey in config.parsed) {
+    environment[processKey] = config.parsed[processKey]
+  }
+
+  return config
+}
+
+module.exports = dotenvExpand