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vite 8.1.5: Vite 8.1.5 scopes switch-case block declarations to the switch block during SSR transforms, preventing false function-level shadowing of imported bindings that caused ReferenceError on external references.

Verifiziertes Beispiel für npm vite 8.1.5: Vite 8.1.5 scopes switch-case block declarations to the switch block during SSR transforms, preventing false…

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Deklarierte Umgebung node linux x64 node node npm

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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
2026-08-16
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

Fall

HOW
Ziel
Vite 8.1.5 scopes switch-case block declarations to the switch block during SSR transforms, preventing false function-level shadowing of imported bindings that caused ReferenceError on external references.
Pakete
Symbole
  • createServer
  • ssrLoadModule
Umgebung
node
Erstellt
2026-08-16T04:51:22Z

Contract

  1. assert imported function calls before switch statements resolve to imported bindings during SSR execution
  2. assert imported function calls in switch discriminant expressions resolve to imported bindings during SSR execution
  3. assert unbraced switch-case local declarations do not shadow imported bindings across the enclosing function in SSR transforms
  4. assert imported function calls after switch statements resolve to imported bindings during SSR execution

Dateien

  • NOTES.md
  • csx.json
  • fixtures/dep.js
  • fixtures/ssr-switch-case.js
  • package-lock.json
  • package.json
  • test/contract.mjs

Quellartefakt herunterladen (tar.gz)

Quelltext

NOTES.md
# Notes: Vite 8.1.5 SSR Switch-Case Declaration Scoping Bugfix

## `search_known_solution` Discovery
- **Initial CSX Search**: Called `search_known_solution` with `pkg:npm/vite`.
- **Existing Sample Found**: `sha256:3d6913c88e87048b4b55cebf64b6e0bd0e5c2fa4e748e8f754ff20cd2baf86bd` ("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.").
- **Targeted Release & Fix**: As required when finding existing network matches, targeted a different, recent patch release: `vite@8.1.5` fixing SSR switch-case AST scope analysis.

## Release & Changelog Reference
- **Release**: `vite@8.1.5` (Released 2026-07-16)
- **Changelog Entry**: `packages/vite/CHANGELOG.md` under `8.1.5 (2026-07-16)`:
  - `* **ssr:** scope switch-case declarations to the switch, not the function (#22893) (b59a73f76f5557492d83d097bb33b3dd02f27d51)`

## Behaviour Before (`vite@8.1.4` and prior)
- During Vite's SSR transformation (`ssrTransform`), lexical declarations (`let`, `const`, `function`, `class`) inside an unbraced `case` clause of a `switch` statement were erroneously registered into the enclosing function's scope table rather than scoped to the switch statement.
- When an imported binding shared the same identifier name as a switch-case declaration, the AST visitor treated all occurrences of that identifier across the entire enclosing function (before the switch, in the switch test/discriminant expression, or after the switch) as references to the local variable.
- Consequently, Vite omitted the necessary SSR transform rewrite to `(0, __vite_ssr_import_0__.<name>)`.

## Behaviour Now (`vite@8.1.5`)
- Switch-case declarations are properly scoped to the switch statement block.
- Identifiers referencing the imported binding outside the switch statement (and inside the switch discriminant expression) are correctly rewritten to the SSR module import getter.
- Inside the switch case, the local variable correctly shadows the imported name for that case branch.

## How the Broken Version Fails
- The broken version (`vite@8.1.4`) fails **loudly** at runtime with:
  ```
  ReferenceError: formatValue is not defined
      at Module.runWorkflow (fixtures/ssr-switch-case.js:10:19)
  ```
  when `mod.runWorkflow()` is executed following `server.ssrLoadModule()`.
csx.json
{"case":{"caseId":"case:sha256:a36510f7a2d4abd004504a3ca1ffe2b3c8089b4d0563868c23efe1a266fb7f38","contract":["assert imported function calls before switch statements resolve to imported bindings during SSR execution","assert imported function calls in switch discriminant expressions resolve to imported bindings during SSR execution","assert unbraced switch-case local declarations do not shadow imported bindings across the enclosing function in SSR transforms","assert imported function calls after switch statements resolve to imported bindings during SSR execution"],"goal":"Vite 8.1.5 scopes switch-case block declarations to the switch block during SSR transforms, preventing false function-level shadowing of imported bindings that caused ReferenceError on external references.","kind":"HOW","packages":["pkg:npm/vite@8.1.5"],"schemaVersion":1,"symbols":["createServer","ssrLoadModule"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","language":"node","os":"linux","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vite@8.1.5"],"schemaVersion":1,"symbols":["createServer","ssrLoadModule"],"verifierAdapter":"node-typescript@1"}
fixtures/dep.js
export function formatValue(val) {
  return `formatted:${val.name || val}`;
}

export function computeMultiplier(factor) {
  return factor * 2;
}
fixtures/ssr-switch-case.js
import { formatValue, computeMultiplier } from './dep.js';

export function runWorkflow(payload) {
  // Pre-switch call: must resolve to imported formatValue
  const initial = formatValue(payload);

  let caseResult = '';
  // Switch discriminant call: must resolve to imported computeMultiplier
  switch (computeMultiplier(payload.count)) {
    case 10:
      // Local binding in case without block braces shadows formatValue within switch in 8.1.5,
      // but in 8.1.4 was erroneously scoped to the whole enclosing function.
      let formatValue = `custom:${payload.name}`;
      caseResult = formatValue;
      break;
    default:
      let computeMultiplier = 999;
      caseResult = `fallback:${computeMultiplier}`;
      break;
  }

  // Post-switch call: must resolve to imported formatValue
  const finalized = formatValue(caseResult);

  return {
    initial,
    caseResult,
    finalized
  };
}
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}
package.json
{
  "name": "cand-vite-ssr-switch-scope-bugfix",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite": "8.1.5"
  }
}
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 server = await createServer({
  root,
  server: { middlewareMode: true },
  appType: 'custom',
  logLevel: 'error'
});

try {
  const mod = await server.ssrLoadModule('/fixtures/ssr-switch-case.js');

  // Case 10: exercises pre-switch import call, discriminant import call, case-scoped local binding, and post-switch import call
  const resultMatchingCase = mod.runWorkflow({ count: 5, name: 'alpha' });
  assert.deepEqual(resultMatchingCase, {
    initial: 'formatted:alpha',
    caseResult: 'custom:alpha',
    finalized: 'formatted:custom:alpha'
  });

  // Default case: exercises discriminant import call, default-scoped local binding, and post-switch import call
  const resultDefaultCase = mod.runWorkflow({ count: 3, name: 'beta' });
  assert.deepEqual(resultDefaultCase, {
    initial: 'formatted:beta',
    caseResult: 'fallback:999',
    finalized: 'formatted:fallback:999'
  });
} finally {
  await server.close();
}

Ursprungs-Seeder

anonymous