feat: add source map support for production stack trace rewriting

packages/react-server/lib/start/action.mjs

@@ -14,6 +14,7 @@ import {
   CONFIG_ROOT,
   LOGGER_CONTEXT,
   SERVER_CONTEXT,
+  SOURCEMAP_ENABLED,
 } from "../../server/symbols.mjs";
 import { formatDuration } from "../utils/format.mjs";
 import getServerAddresses from "../utils/server-address.mjs";
@@ -45,6 +46,9 @@ async function worker(root, options, config) {
 
   await runtime_init$(async () => {
     runtime$(CONFIG_CONTEXT, config);
+    // Check if sourcemaps are available by looking for .map files in build output
+    // This will be set to true if sourcemaps were generated during build
+    runtime$(SOURCEMAP_ENABLED, false);
     const logger = await createLogger(configRoot);
     const server = await createServer(root, options);
     const { port, listenerHost } = getServerConfig(configRoot, options);

packages/react-server/lib/start/ssr-handler.mjs

@@ -1,3 +1,4 @@
+import { access, constants as fsConstants } from "node:fs/promises";
 import { createRequire, register } from "node:module";
 import { join, relative } from "node:path";
 import { pathToFileURL } from "node:url";
@@ -38,6 +39,7 @@ import {
   RENDER_CONTEXT,
   RENDER_STREAM,
   SERVER_CONTEXT,
+  SOURCEMAP_ENABLED,
   STYLES_CONTEXT,
 } from "../../server/symbols.mjs";
 import { ContextManager } from "../async-local-storage.mjs";
@@ -109,6 +111,25 @@ export default async function ssrHandler(root, options = {}) {
   const moduleCacheStorage = new ContextManager();
   await module_loader_init$(moduleLoader, moduleCacheStorage);
 
+  // Check if sourcemaps are available by checking if entryModule has a .map file
+  let sourcemapEnabled = false;
+  try {
+    await access(`${entryModule}.map`, fsConstants.R_OK);
+    sourcemapEnabled = true;
+    // Dynamically import and install source-map-support only when source maps are available
+    const { default: sourceMapSupport } = await import("source-map-support");
+    sourceMapSupport.install({
+      environment: "node",
+      hookRequire: false,
+      handleUncaughtExceptions: false,
+    });
+    console.log("[SourceMap] Source map support enabled");
+  } catch {
+    // Sourcemaps not available
+    console.log("[SourceMap] No source maps found");
+  }
+  runtime$(SOURCEMAP_ENABLED, sourcemapEnabled);
+
   const importMap =
     configRoot.importMap || configRoot.resolve?.shared
       ? {

packages/react-server/package.json

@@ -163,6 +163,7 @@
     "socket.io": "^4.8.1",
     "socket.io-client": "^4.8.1",
     "source-map": "^0.7.4",
+    "source-map-support": "^0.5.21",
     "strip-ansi": "^7.1.0",
     "style-to-js": "^1.1.12",
     "unstorage": "^1.16.0",

packages/react-server/server/symbols.mjs

@@ -26,6 +26,7 @@ export const SSR_CONTROLLER = Symbol.for("SSR_CONTROLLER");
 export const ROUTE_MATCH = Symbol.for("ROUTE_MATCH");
 export const STYLES_CONTEXT = Symbol.for("STYLES_CONTEXT");
 export const BUILD_OPTIONS = Symbol.for("BUILD_OPTIONS");
+export const SOURCEMAP_ENABLED = Symbol.for("SOURCEMAP_ENABLED");
 export const ACTION_CONTEXT = Symbol.for("ACTION_CONTEXT");
 export const RELOAD = Symbol.for("RELOAD");
 export const RENDER = Symbol.for("RENDER");