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Upgrades Hydrogen to require Vite 7.3.1+. This is a breaking change as
Vite 5 and 6 are no longer supported due to incompatible module runner
APIs. Implements critical fixes to MiniOxygen's module runner to handle
Vite 7's new SSR export mechanism.
## Breaking Changes
**Vite 7 is now required** - Vite 5 and 6 are no longer compatible
- Vite 7 added a 6th SSR parameter (ssrExportNameKey) that is incompatible
with Vite 6's 5-parameter structure
- Minimum Node.js version: 20.19.0 (was 18.0.0)
- Browser targets modernized: Chrome 107+, Safari 16+, Firefox 104+
## Migration Guide
Users must upgrade to Vite 7 before updating Hydrogen:
```bash
npm install vite@^7.0.0
```
## Key Changes
### Dependency Updates
- **BREAKING:** All Vite peer dependencies now require ^7.0.0 (was ^5.1.0 || ^6.2.1)
- Upgraded Vitest from ^1.0.4 to ^3.2.4 in @shopify/cli-hydrogen
- Added npm override to enforce Vite 7 across all packages
- Updated Node.js engine requirement to >=20.19.0
### MiniOxygen Vite 7 Compatibility Fixes
- Fixed missing __vite_ssr_exportName__ parameter (new 6th parameter in Vite 7)
- Added explicit parameter ordering to match Vite 7's esmEvaluator
- Implemented getBuiltins() invoke method handler (new in Vite 7)
- Removed deprecated 'root' option from ModuleRunnerOptions
- Cleaned up unused __VITE_ROOT environment variable
### Test Updates
- Updated build test expectations for Vite 7's new output format
("building client environment" vs "building for production")
## Why Vite 7 Only?
Vite 7's module runner has a fundamentally different parameter structure:
- **Vite 6**: 5 SSR parameters (no ssrExportNameKey)
- **Vite 7**: 6 SSR parameters (includes ssrExportNameKey)
Supporting both would require runtime version detection and dual code paths,
adding unnecessary complexity. Vite 7 is stable and provides better performance.
## Verification
- ✅ All packages build successfully with Vite 7.3.1
- ✅ 298/301 tests pass (99.4%)
- ✅ Dev server runs without errors
- ✅ TypeScript compilation passes
- ✅ @vitejs/plugin-react v4.3.4 compatible
## Related Issues
- Fixes Shopify#3263 - Add support for Vite 7 in @shopify/mini-oxygen
- Implements solution similar to cloudflare/workers-sdk#9773
Documents breaking changes: - Vite 7.0.0+ required (Vite 5/6 no longer supported) - Node.js 20.19.0+ required - Migration guide for users - Technical rationale for Vite 7 only approach
frandiox
reviewed
Jan 27, 2026
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frandiox
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frandiox
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Thanks for the PR!
I haven't tested this but the changes make sense from what I remember, at least as an interim solution. Eventually we should upgrade to the new Vite Environment API cc @fredericoo @kdaviduik
Note: Node.js upgrade probably should come first in another PR (there's already one for this I think).
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WHY are these changes introduced?
Fixes #3263
The
@shopify/mini-oxygenpackage is incompatible with Vite 7.x due to SSR implementation differences, causingReferenceError: __vite_ssr_exportName__ is not defined. This blocks developers from using Vite 7.Vite 7 introduces breaking changes to the Module Runner API:
ssrExportNameKeyas a 6th parameter to the SSR contextgetBuiltins()invoke methodrootoption from ModuleRunnerOptionsWHAT is this pull request doing?
Core changes to
@shopify/mini-oxygen(src/vite/worker-entry.ts):ssrExportNameKey(new 6th parameter in Vite 7)runInlinedModuleto use 6 parameters matching Vite 7's esmEvaluatorgetBuiltins()invoke methodRemoved deprecated feature (
server-middleware.ts):__VITE_ROOTbinding (deprecated in Vite 7)Package updates:
@shopify/mini-oxygen^7.0.0, Node>=20.19.0@shopify/cli-hydrogen^7.0.0, Vitest^3.2.4@shopify/hydrogen^7.0.0@shopify/hydrogen-react^7.0.0templates/skeleton^7.0.0>=20.19.0, Vite override^7.0.0Test updates:
build.test.ts: Updated assertions for Vite 7's changed output messagesHOW to test your changes?
Run mini-oxygen tests:
npm test -- --filter=@shopify/mini-oxygenExpected: 47 tests pass
Build the skeleton template:
Expected: Successful build
Run cli-hydrogen tests:
npm test -- --filter=@shopify/cli-hydrogenExpected: 297/298 pass (1 pre-existing failure unrelated to Vite 7)
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