exclude build-time files

packages/nextjs/src/config/types.ts

@@ -3,6 +3,11 @@ import { WebpackPluginInstance } from 'webpack';
 
 export type SentryWebpackPluginOptions = SentryCliPluginOptions;
 export type SentryWebpackPlugin = WebpackPluginInstance & { options: SentryWebpackPluginOptions };
+// Export this from here because importing something from Webpack (the library) in `webpack.ts` confuses the heck out of
+// madge, which we use for circular dependency checking. We've manually excluded this file from the check (which is
+// safe, since it only includes types), so we can import it here without causing madge to fail. See
+// https://github.com/pahen/madge/issues/306.
+export type { WebpackPluginInstance };
 
 /**
  * Overall Nextjs config

packages/nextjs/src/config/webpack.ts

@@ -6,7 +6,9 @@ import * as chalk from 'chalk';
 import * as fs from 'fs';
 import * as path from 'path';
 
-import {
+// Note: If you need to import a type from Webpack, do it in `types.ts` and export it from there. Otherwise, our
+// circular dependency check thinks this file is importing from itself. See https://github.com/pahen/madge/issues/306.
+import type {
   BuildContext,
   EntryPropertyObject,
   NextConfigObject,
@@ -16,6 +18,7 @@ import {
   WebpackConfigObject,
   WebpackEntryProperty,
   WebpackModuleRule,
+  WebpackPluginInstance,
 } from './types';
 
 export { SentryWebpackPlugin };
@@ -100,6 +103,23 @@ export function constructWebpackConfigFunction(
           ],
         });
       }
+
+      // Prevent `@vercel/nft` (which nextjs uses to determine which files are needed when packaging up a lambda) from
+      // including any of our build-time code or dependencies. (Otherwise it'll include files like this one and even the
+      // entirety of rollup and sucrase.)
+      const nftPlugin = newConfig.plugins?.find((plugin: WebpackPluginInstance) => {
+        const proto = Object.getPrototypeOf(plugin) as WebpackPluginInstance;
+        return proto.constructor.name === 'TraceEntryPointsPlugin';
+      }) as WebpackPluginInstance & { excludeFiles: string[] };
+      if (nftPlugin) {
+        nftPlugin.excludeFiles = nftPlugin.excludeFiles || [];
+        nftPlugin.excludeFiles.push(path.join(__dirname, 'withSentryConfig.js'));
+      } else {
+        __DEBUG_BUILD__ &&
+          logger.warn(
+            'Unable to exclude Sentry build-time helpers from nft files. Could not find `TraceEntryPointsPlugin`.',
+          );
+      }
     }
 
     // The SDK uses syntax (ES6 and ES6+ features like object spread) which isn't supported by older browsers. For users