fix: module compat for remix esm

Author: logaretm

packages/remix/package.json

@@ -29,7 +29,11 @@
         "require": "./build/cjs/index.client.js",
         "default": "./build/cjs/index.client.js"
       },
-      "node": "./build/cjs/index.server.js",
+      "node": {
+        "import": "./build/esm/index.server.js",
+        "require": "./build/cjs/index.server.js",
+        "default": "./build/cjs/index.server.js"
+      },
       "worker": {
         "import": "./build/esm/cloudflare/index.js",
         "require": "./build/cjs/cloudflare/index.js",

packages/remix/src/server/instrumentServer.ts

@@ -35,6 +35,7 @@ import {
   winterCGRequestToRequestData,
   withIsolationScope,
 } from '@sentry/core';
+import { createRequire } from 'module';
 import { DEBUG_BUILD } from '../utils/debug-build';
 import { createRoutes, getTransactionName } from '../utils/utils';
 import { extractData, isResponse, json } from '../utils/vendor/response';
@@ -480,14 +481,37 @@ export const makeWrappedCreateRequestHandler = (options?: { instrumentTracing?:
     };
   };
 
+/**
+ * Helper to load a module in both CJS and ESM contexts.
+ * In ESM, we use createRequire to create a require function.
+ * In CJS, we use the standard loadModule.
+ */
+function loadModuleCompat<T>(moduleName: string): T | undefined {
+  // Check if we're in ESM context (module doesn't exist)
+  if (typeof module === 'undefined') {
+    // ESM context - use createRequire to get a require function
+    try {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      const require = createRequire(import.meta.url);
+      return require(moduleName) as T;
+    } catch {
+      return undefined;
+    }
+  } else {
+    // CJS context - use loadModule with module reference
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return loadModule<T>(moduleName, module as any);
+  }
+}
+
 /**
  * Monkey-patch Remix's `createRequestHandler` from `@remix-run/server-runtime`
  * which Remix Adapters (https://remix.run/docs/en/v1/api/remix) use underneath.
  */
 export function instrumentServer(options?: { instrumentTracing?: boolean }): void {
-  const pkg = loadModule<{
+  const pkg = loadModuleCompat<{
     createRequestHandler: CreateRequestHandlerFunction;
-  }>('@remix-run/server-runtime', module);
+  }>('@remix-run/server-runtime');
 
   if (!pkg) {
     DEBUG_BUILD && debug.warn('Remix SDK was unable to require `@remix-run/server-runtime` package.');