feat: Add lightweight Node.js document shim and enhance type checking guards

.eslintrc.json

@@ -5,7 +5,12 @@
     "es6": true,
     "mocha": true
   },
-  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
   "parser": "@typescript-eslint/parser",
-  "plugins": ["@typescript-eslint"]
+  "plugins": [
+    "@typescript-eslint"
+  ]
 }

.replit

@@ -0,0 +1,23 @@
+run = "./run.sh"
+entrypoint = "src/index.ts"
+hidden = [".config", "package-lock.json", "tsconfig.json"]
+modules = ["nodejs-20"]
+
+[nix]
+channel = "stable-24_05"
+
+[gitHubImport]
+requiredFiles = [".replit", "replit.nix", ".config"]
+
+[deployment]
+run = ["./run.sh"]
+deploymentTarget = "cloudrun"
+ignorePorts = false
+
+[[ports]]
+localPort = 3000
+externalPort = 80
+
+[[ports]]
+localPort = 9876
+externalPort = 3000