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.

# 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()`.

{"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"}

export function formatValue(val) {
  return `formatted:${val.name || val}`;
}

export function computeMultiplier(factor) {
  return factor * 2;
}

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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{
  "name": "cand-vite-ssr-switch-scope-bugfix",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "vite": "8.1.5"
  }
}

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();
}