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Graph/esm-cjs-externalization-mismatch

AntiPattern

Bundler Externalization Mismatch

esm-cjs-externalization-mismatch

Runtime modules and JSX helpers get misclassified as internal during Vite/Rollup and SSR bundling, so builds emit or require the wrong forms (ESM vs CommonJS) and React/React Router/Apollo/PDF fail to load.

Node Details

Public graph metadata

Updated7/5/2026

Connections

30 linked nodes

MATCHESSolution

Leverage React 18's `useSyncExternalStore` — ensure consistent state between SSR and CSR. Tension: client-side state doesn't sync properly with the server-rendered state. Outcome: to ensure consistent state between SSR and CSR.

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so by wrapping components like — import dynamic from 'next/dynamic';. Tension: your child components will not use ssr. Outcome: remember to add 'use client' as well.

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Tension: prevents you from interact with other elements. Outcome: working playground: https://stackblitz.com/edit/stackblitz-starters-gl6ghw?description=The%20React%20framework%20for%20production&file=app%2Fpage.tsx,app%2Fglobals.css&title=Next.js%20Starter.

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The solution here looks ver y plausible but didn’t have any visible effect. — inside Tanstack Start / Vite / Vinxi. Tension: Default imports and everything else I could find did not work. Outcome: Create a `jsconfig.json` file with the following content:.

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if using a bundler plugin, build your project or start a dev server — Here is a guide on setting up the file based router for different environments. Tension: Tanstack Router generates a file `routeTree.gen.ts`. Outcome: which declares the interface `FileRoutesByPath`.

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Align Tanstack Query package versions per the official React Query SSR/Next.js guide and use the correct SSR hydration components (Hydrate/DehydratedState/QueryClientProvider) as shown in the documentation.

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use hash-based routing — react + tanstack router + github pages. Tension: The default "browser" routing will exhibit the behaviour you describe.

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Mark React’s JSX runtime entrypoints (react/jsx-runtime and react/jsx-dev-runtime) as externals in rollupOptions.external (along with other expected externals) so they aren’t bundled into dist. Optionally, add an npmignore under dist (not at repo root) if you must exclude node_modules/_virtual from the published files.

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webpack config. Tension: These two solutions can both fix this issue.

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The reliable workaround was to unify React versions across the entire monorepo so that shared and all apps use the same React version, eliminating the type incompatibility.

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Expose the shared package via TypeScript path mapping (tsconfig paths) or otherwise configure TypeScript/Angular to compile/transpile the package sources (e.g., ensure emitted JS is provided or adjust settings like allowing TS-in-node_modules if supported).

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Using a bundler — In order to solve this. Tension: remove those packages from the package.json manifest that is being sent to Firebase. Outcome: so it doesn’t know these packages even existed.

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changed `moduleResolution` from `nodenext` to `bundler` — tsconfig.base.json. Tension: Module not found: Can't resolve '@models/business/Business.model'. Outcome: webpack build went successful.

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Ensure that "libquery_engine-rhel-openssl-3.0.x.so.node" has been copied next to the bundle or in "generated/prisma" — We detected that you are using Next.js. Tension: This is likely caused by a bundler that has not copied "libquery_engine-rhel-openssl-3.0.x.so.node" next to the resulting bundle. Outcome: I made some progress. So I created another page at /prisma-check and it has.

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Change the imports to use proper type-only syntax, e.g. `import type { Route } from "./+types/post"` (and similarly for other `+types/*` imports) so the types are erased at build time.

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You are going to have to use 11.1.4 — Amplify doesn't support Nextjs 12 yet. Tension: the build is error when starting SSR build. Outcome: use 11.1.4.

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"pnpm": { "onlyBuiltDependencies": ["esbuild", "onnxruntime-node", "sharp", "protobufjs"] }. Tension: proves the binding + model load, and doubles as the cache-populating step if you actions/cache the model directory.

MATCHESSolution

Look for where you are using <React.Fragment> or the shorthand <> in those files. Tension: Since I cant change the code in packages, what can I do get rid of those errors? Outcome: replace React.Fragment with an actual HTML element, such as a .

MATCHESSolution

Either downgrade `@react-pdf/renderer` to `3.4.5` (restoring CommonJS compatibility) or change the TypeScript/Next build output to emit ES modules (e.g., set `compilerOptions.module` to `es6`/`esnext`) so it can load the package correctly.

MATCHESSolution

resolve npm install @reduxjs/toolkit@^1.9.6 — in my Expo project. Tension: createSlice is not a function (it is undefined). Outcome: npm install @reduxjs/toolkit@^1.9.6.

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// config.resolver.sourceExts.push("cjs");.

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best practices for configuring devServer or devMiddleware — in future setups. Tension: prevent such vulnerabilities. Outcome: without upgrading the entire Vue CLI or webpack stack.

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The bundler needs to bridge those two formats. Tension: Slider becomes an object like { __esModule: true, default: function Slider() {} } instead of the `function Slider()` React expects. Outcome: React gets a Wrapper Object.

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A workaround to this issue is to explicitly read the default export. — This works in all bundlers and safe for both ESM and CJS. Tension: Then use ``. Outcome: const Slider = SliderImport.default ?? SliderImport;.

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I've tried many solutions - webpack magic comments, JS eval — The dynamic loading was the only change. Outcome: it worked in a way that bundle is no 700kB instead of 6mb.

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Configure Vite aliases to point react-dom and (optionally) scheduler/tracing to the profiling entrypoints (e.g., alias 'react-dom' to 'node_modules/react-dom/profiling' and 'scheduler/tracing' to 'node_modules/scheduler/tracing-profiling', or alias 'react-dom/client' to 'react-dom/profiling'), then wrap the app with the <Profiler> component as needed.

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Update tsconfig (tsconfig.app.json or tsconfig.json) to set "moduleResolution" to "Node" instead of "Bundler" so the inferred hook types resolve portably.

MATCHESSolution

Export the components from the bundle and access them from webpackLib before calling React.createElement

MATCHESSolution

Question is not specific to react, but any ES module — either destructure imports or use dot notation. Outcome: the minified bundle will include something of the form `r.u` instead of `u` if we plan on not destructing.

MATCHESSolution

Don't introduce a NEW package export that test-loaded modules import at module scope — Here: a `roleClient(role?)` helper in the consumer package (`etl/llm-route.ts`). Tension: it forces you to update every `vi.mock` factory, and missing one re-breaks CI.

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