web: Flesh out configs. (#13801)

packages/monorepo/constants.js

@@ -0,0 +1,17 @@
+/**
+ * @file Constants for JavaScript and TypeScript files.
+ *
+ */
+
+/**
+ * The current Node.js environment, defaulting to "development" when not set.
+ *
+ * Note, this should only be used during the build process.
+ *
+ * If you need to check the environment at runtime, use `process.env.NODE_ENV` to
+ * ensure that module tree-shaking works correctly.
+ *
+ */
+export const NodeEnvironment = /** @type {'development' | 'production'} */ (
+    process.env.NODE_ENV || "development"
+);