Use NODE_ENV for environment detection

Author: dhl

src/app/utils/content-source.ts

@@ -27,7 +27,7 @@ export async function fetchCompiledContent(
 
   const normalizedPath = relativePath.replace(/^\/+/, "");
 
-  const isDevelopment = process.env.NEXTJS_ENV === "development";
+  const isDevelopment = process.env.NODE_ENV === "development";
 
   if (isDevelopment) {
     // In development, read the raw MDX file and return it for on-the-fly compilation

src/app/utils/mdx.tsx

@@ -18,7 +18,8 @@ import { fetchCompiledContent, CompiledMDX } from "./content-source";
 export async function renderSafeMdx(compiled: CompiledMDX) {
   // In production, mdast is already compiled and included
   // Only parse in development mode when mdast is null
-  const isDevelopment = process.env.NEXTJS_ENV === "development";
+  const isDevelopment = process.env.NODE_ENV === "development";
+
   const mdast =
     compiled.mdast || (isDevelopment ? mdxParse(compiled.raw) : null);
   if (!mdast) {