CodeSampleX

Beispiel

lodash 4.17.21: CommonJS dependencies require both ssr.noExternal and ssr.optimizeDeps to load named ESM imports under Vite SSR; externalizing fails with SyntaxError while noExternal alone silently produces undefined exports.

Verifiziertes Beispiel für npm lodash 4.17.21: CommonJS dependencies require both ssr.noExternal and ssr.optimizeDeps to load named ESM imports under Vite…

sha256:3d6913c88e87048b4b55cebf64b6e0bd0e5c2fa4e748e8f754ff20cd2baf86bd

Dieses Netzwerk bietet eine Sache: ein Sample, das baut. Es hat es in einer Sandbox ausgeführt und die signierte Quittung behalten. Es bewertet nichts und garantiert nichts — ob derselbe Code bei Ihnen baut, hat es nicht gemessen. Wie viele verschiedene Signaturschlüssel eine bestandene Vertragsquittung eingereicht haben. Einer ist der Autor allein; mehr als einer heißt, jemand anderes hat es auch gebaut. Ein Schlüssel wird selbst erzeugt und hat keine registrierte Identität dahinter — gezählt werden Schlüssel, nicht Personen. MIT-0

Ausführungsbelege

Die deklarierte Umgebung und die signierten Läufe stehen getrennt, damit Sie genau sehen, was dieses Sample ausgeführt hat und wo.

Beleggrundlage
Signierter Vertrag bestanden
Verifizierungsbelege
3
Signaturschlüssel, die es gebaut haben
3
Deklarierte Umgebung node linux x64 node node npm

Umgebungen der Verifizierungsläufe

Umgebung Contract Stufen Lauf
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-15
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-18
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-09-08

Fall

HOW
Ziel
CommonJS dependencies require both ssr.noExternal and ssr.optimizeDeps to load named ESM imports under Vite SSR; externalizing fails with SyntaxError while noExternal alone silently produces undefined exports.
Pakete
Symbole
  • createServer
  • ssrLoadModule
  • ssr.noExternal
  • optimizeDeps
  • ssr.optimizeDeps
Umgebung
node
Erstellt
2026-08-15T14:40:23Z

Contract

  1. assert default SSR externalization rejects named imports from CommonJS modules with SyntaxError
  2. assert client-side optimizeDeps does not affect SSR module externalization
  3. assert ssr.optimizeDeps without ssr.noExternal still externalizes the package and fails with SyntaxError
  4. assert ssr.noExternal alone prevents SyntaxError but yields undefined for named CommonJS exports
  5. assert combining ssr.noExternal and ssr.optimizeDeps correctly synthesizes named and default exports

Dateien

  • NOTES.md
  • csx.json
  • fixtures/default-import.js
  • fixtures/named-import.js
  • package-lock.json
  • package.json
  • test/contract.mjs

Quellartefakt herunterladen (tar.gz)

Quelltext

NOTES.md
# Notes: Vite SSR CommonJS Loading (`ssr.noExternal` vs `optimizeDeps`)

## `search_known_solution` Result
- **Result**: `MISS`
- The initial query for Vite SSR CommonJS loading (`ssr.noExternal` and `optimizeDeps`) returned no existing matches (only unrelated fallback entries for Python `tomllib` and `orjson`).

## What a Model Would Have Written Instead
- Most models recommend adding `optimizeDeps: { include: ['lodash'] }` at the root configuration or `ssr: { noExternal: ['lodash'] }` alone, believing either directive enables named ESM imports (`import { debounce } from 'lodash'`) under Vite SSR.

## How the Wrong Version Fails
- **Root `optimizeDeps: { include: ['lodash'] }` (or `ssr.optimizeDeps` without `ssr.noExternal`)**: Fails **loudly** during SSR module execution with `SyntaxError: [vite] Named export 'debounce' not found. The requested module 'lodash' is a CommonJS module, which may not support all module.exports as named exports.`
- **`ssr: { noExternal: ['lodash'] }` alone without `ssr.optimizeDeps`**: Bypasses externalization but fails **silently** at runtime by leaving all named CommonJS exports as `undefined` (`typeof debounce === 'undefined'`) instead of synthesizing exports.
- **Working Solution**: Both `ssr.noExternal: ['lodash']` (to prevent Node externalization) AND `ssr.optimizeDeps: { include: ['lodash'] }` (to run esbuild CJS-to-ESM pre-bundling) are required for named imports to resolve to executable functions.
csx.json
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fixtures/default-import.js
import lodash from 'lodash';

export const isLodashAvailable = typeof lodash === 'function' && typeof lodash.debounce === 'function';
export default lodash;
fixtures/named-import.js
import { debounce } from 'lodash';

export const isDebounceFunction = typeof debounce === 'function';
export { debounce };
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        "@rollup/rollup-linux-s390x-gnu": "4.62.4",
        "@rollup/rollup-linux-x64-gnu": "4.62.4",
        "@rollup/rollup-linux-x64-musl": "4.62.4",
        "@rollup/rollup-openbsd-x64": "4.62.4",
        "@rollup/rollup-openharmony-arm64": "4.62.4",
        "@rollup/rollup-win32-arm64-msvc": "4.62.4",
        "@rollup/rollup-win32-ia32-msvc": "4.62.4",
        "@rollup/rollup-win32-x64-gnu": "4.62.4",
        "@rollup/rollup-win32-x64-msvc": "4.62.4",
        "fsevents": "~2.3.2"
      }
    },
    "node_modules/source-map-js": {
      "version": "1.2.1",
      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
      "license": "BSD-3-Clause",
      "engines": {
        "node": ">=0.10.0"
      }
    },
    "node_modules/vite": {
      "version": "6.2.0",
      "resolved": "https://registry.npmjs.org/vite/-/vite-6.2.0.tgz",
      "integrity": "sha512-7dPxoo+WsT/64rDcwoOjk76XHj+TqNTIvHKcuMQ1k4/SeHDaQt5GFAeLYzrimZrMpn/O6DtdI03WUjdxuPM0oQ==",
      "license": "MIT",
      "dependencies": {
        "esbuild": "^0.25.0",
        "postcss": "^8.5.3",
        "rollup": "^4.30.1"
      },
      "bin": {
        "vite": "bin/vite.js"
      },
      "engines": {
        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
      },
      "funding": {
        "url": "https://github.com/vitejs/vite?sponsor=1"
      },
      "optionalDependencies": {
        "fsevents": "~2.3.3"
      },
      "peerDependencies": {
        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
        "jiti": ">=1.21.0",
        "less": "*",
        "lightningcss": "^1.21.0",
        "sass": "*",
        "sass-embedded": "*",
        "stylus": "*",
        "sugarss": "*",
        "terser": "^5.16.0",
        "tsx": "^4.8.1",
        "yaml": "^2.4.2"
      },
      "peerDependenciesMeta": {
        "@types/node": {
          "optional": true
        },
        "jiti": {
          "optional": true
        },
        "less": {
          "optional": true
        },
        "lightningcss": {
          "optional": true
        },
        "sass": {
          "optional": true
        },
        "sass-embedded": {
          "optional": true
        },
        "stylus": {
          "optional": true
        },
        "sugarss": {
          "optional": true
        },
        "terser": {
          "optional": true
        },
        "tsx": {
          "optional": true
        },
        "yaml": {
          "optional": true
        }
      }
    }
  }
}
package.json
{
  "name": "cand-vite-ssr-noexternal",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "lodash": "4.17.21",
    "vite": "6.2.0"
  },
  "license": "MIT-0"
}
test/contract.mjs
import assert from 'node:assert/strict';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { createServer } from 'vite';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const root = path.resolve(__dirname, '..');
const namedEntry = '/fixtures/named-import.js';
const defaultEntry = '/fixtures/default-import.js';

// 1. Default Vite SSR externalizes CommonJS dependencies, failing named ESM imports with SyntaxError
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
  });

  let error = null;
  try {
    await server.ssrLoadModule(namedEntry);
  } catch (err) {
    error = err;
  } finally {
    await server.close();
  }

  assert.ok(error, 'Default SSR must reject named imports from externalized CommonJS dependencies');
  assert.equal(error.name, 'SyntaxError');
  assert.match(
    error.message,
    /Named export 'debounce' not found.*CommonJS module/s,
    'Vite SSR error must specifically state that the CommonJS module lacks static named exports'
  );
}

// 2. Client-side optimizeDeps does NOT affect SSR externalization (still throws SyntaxError)
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
    optimizeDeps: {
      include: ['lodash'],
    },
  });

  let error = null;
  try {
    await server.ssrLoadModule(namedEntry);
  } catch (err) {
    error = err;
  } finally {
    await server.close();
  }

  assert.ok(error, 'Client optimizeDeps alone must not resolve SSR externalization');
  assert.equal(error.name, 'SyntaxError');
  assert.match(error.message, /Named export 'debounce' not found/s);
}

// 3. ssr.optimizeDeps without ssr.noExternal still externalizes the package in Node SSR
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
    ssr: {
      optimizeDeps: {
        include: ['lodash'],
      },
    },
  });

  let error = null;
  try {
    await server.ssrLoadModule(namedEntry);
  } catch (err) {
    error = err;
  } finally {
    await server.close();
  }

  assert.ok(error, 'ssr.optimizeDeps without ssr.noExternal still fails for external CJS package');
  assert.equal(error.name, 'SyntaxError');
  assert.match(error.message, /Named export 'debounce' not found/s);
}

// 4. ssr.noExternal alone prevents SyntaxError but leaves named imports undefined without ssr.optimizeDeps
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
    ssr: {
      noExternal: ['lodash'],
    },
  });

  let mod = null;
  try {
    mod = await server.ssrLoadModule(namedEntry);
  } finally {
    await server.close();
  }

  assert.ok(mod, 'Module loads without SyntaxError when ssr.noExternal is set');
  assert.equal(mod.isDebounceFunction, false, 'Without ssr.optimizeDeps, named export is undefined');
  assert.equal(typeof mod.debounce, 'undefined', 'Named export debounce evaluates to undefined');
}

// 5. ssr.noExternal + ssr.optimizeDeps enables full CJS-to-ESM transformation with callable named exports
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
    ssr: {
      noExternal: ['lodash'],
      optimizeDeps: {
        include: ['lodash'],
      },
    },
  });

  let namedMod = null;
  let defaultMod = null;
  try {
    namedMod = await server.ssrLoadModule(namedEntry);
    defaultMod = await server.ssrLoadModule(defaultEntry);
  } finally {
    await server.close();
  }

  assert.equal(namedMod.isDebounceFunction, true, 'Named import must be resolved as a function');
  assert.equal(typeof namedMod.debounce, 'function', 'Named export debounce must be callable');
  assert.equal(defaultMod.isLodashAvailable, true, 'Default import must also be available');
}

// 6. RegExp pattern in ssr.noExternal with ssr.optimizeDeps also resolves named exports
{
  const server = await createServer({
    root,
    server: { middlewareMode: true },
    appType: 'custom',
    configFile: false,
    logLevel: 'silent',
    ssr: {
      noExternal: [/^lodash/],
      optimizeDeps: {
        include: ['lodash'],
      },
    },
  });

  let mod = null;
  try {
    mod = await server.ssrLoadModule(namedEntry);
  } finally {
    await server.close();
  }

  assert.equal(mod.isDebounceFunction, true);
  assert.equal(typeof mod.debounce, 'function');
}

console.log('Contract tests passed successfully.');

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