Can't import UMD build because it doesn't exist in exports

[tonymtz]

Hello,

I'm having issues trying to import the StartServer function from "@tanstack/react-start". Sadly, my project isn't configured to use es modules. As a workaround, I'm trying to import the UMD build, but got this error:

[start] node:internal/modules/cjs/loader:571
[start]       throw e;
[start]       ^
[start]
[start] Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './build/umd/index.production' is not defined by "exports" in /[redacted]/node_modules/@tanstack/react-start/package.json
[start]     at new NodeError (node:internal/errors:399:5)
[start]     at exportsNotFound (node:internal/modules/esm/resolve:361:10)
[start]     at packageExportsResolve (node:internal/modules/esm/resolve:697:9)
[start]     at resolveExports (node:internal/modules/cjs/loader:565:36)
[start]     at Module._findPath (node:internal/modules/cjs/loader:634:31)
[start]     at Module._resolveFilename (node:internal/modules/cjs/loader:1061:27)
[start]     at Hook.Module.require (/[redacted]/node_modules/dd-trace/packages/dd-trace/src/ritm.js:54:29)
[start]     at require (node:internal/modules/cjs/helpers:110:18)
[start]     at @tanstack/react-start/build/umd/index.production (/[redacted]/dist/server.js:2423:18)
[start]     at __webpack_require__ (/[redacted]/dist/server.js:3250:41) {
[start]   code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
[start] }
[start]
[start] Node.js v18.16.0

Is there a workaround for this issue? I'm trying to follow this guide (https://tanstack.com/router/v1/docs/guide/ssr) to achieve SSR with tanstack-router and my react app but unfortunately it seems a bit outdated, also the examples in the docs don't seem to be working.