add vercel prod env check

Author: lobsterkatie

packages/nextjs/src/config/webpack.ts

@@ -142,6 +142,8 @@ export function constructWebpackConfigFunction(
       // with the `--ignore-scripts` option, this will be blocked and the missing binary will cause an error when users
       // try to build their apps.)
       ensureCLIBinaryExists() &&
+      // TODO: We might want to add detection for other non-prod environments
+      !isVercelNonProdEnv() &&
       (isServer ? !userSentryOptions.disableServerWebpackPlugin : !userSentryOptions.disableClientWebpackPlugin);
 
     if (enableWebpackPlugin) {
@@ -460,3 +462,9 @@ function ensureCLIBinaryExists(): boolean {
   }
   return false;
 }
+
+/** Detect whether this build is part of a prod deployment on vercel, in order to decide whether to run the webpack
+ * plugin */
+function isVercelNonProdEnv(): boolean {
+  return process.env.VERCEL_ENV === 'preview' || process.env.VERCEL_ENV === 'development';
+}