fix(devtools-vite): inject data-tsd-source before other plugins transform by AlemTuzlak · Pull Request #548 · TanStack/devtools

AlemTuzlak · 2026-10-02T14:03:19Z

In SSR apps such as TanStack Start, data-tsd-source can differ between the server and the client by a fixed number of lines, so React reports a hydration mismatch. This PR runs source injection before the transforms of other plugins, so both environments read the same original lines.

🎯 Changes

inject-source used enforce: 'pre' only. A pre plugin listed before devtools() transformed the code first.
When that plugin changes the code of one environment only (a server-function compiler, for example), the lines shift in that environment. The injected location then differs: editor.tsx:632:5 on the server and editor.tsx:636:5 on the client.
The transform hook now has order: 'pre'. Vite runs order: 'pre' hooks before all other transform hooks, whatever the position of the plugin in the array.
Between two order: 'pre' hooks, Vite keeps the array order. So a plugin before devtools() that also uses order: 'pre' still runs first.
The docs already say to put devtools() first. With this change, a different position no longer breaks hydration.

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with pnpm test:pr, or these tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Testing

Commands run

vitest run in packages/devtools-vite: 22 tests pass.
The new test starts a real Vite 8 dev server in middleware mode. A pre plugin before devtools() adds 3 lines to the SSR code only. Before the fix: client App.tsx:2:10, SSR App.tsx:5:10. After the fix: both App.tsx:2:10.
eslint, tsc, and prettier --check in packages/devtools-vite: pass.
I did not run the full pnpm test:pr.

Manual test

In a TanStack Start app, put devtools() after tanstackStart() in vite.config.ts.
Before this fix: the browser console shows a hydration warning with two different data-tsd-source values.
After this fix: there is no data-tsd-source hydration warning, and click-to-source opens the right line.

How this PR makes testing easy

packages/devtools-vite/tests/inject-source-order.test.ts reproduces the line shift with a real Vite server and compares the client and SSR output.

Linked issues

Fixes #405
Fixes #189

Risk / rollback

Low. Source injection now sees the original file in more setups. A plugin that turns another format into JSX (for example MDX) and runs before devtools() no longer gets its JSX output annotated. This is the same result as when devtools() is first, which the docs already require. To undo, revert this PR.

🤖 Generated with Claude Code

Summary by CodeRabbit

Bug Fixes
- Source locations now remain consistent between server-rendered and client code when the devtools plugin runs after other transforms, helping prevent hydration warnings.

…form inject-source uses `enforce: 'pre'`, so a `pre` plugin listed before devtools() transformed the code first. When that plugin changes the code of one environment only (a server-function compiler, for example), the lines shift, and data-tsd-source differs between the SSR and client output. React then reports a hydration mismatch, for example `editor.tsx:632:5` on the server and `editor.tsx:636:5` on the client. The transform hook now has `order: 'pre'`, so it runs before the other plugins' transform hooks, whatever their position in the array. Fixes #405 Fixes #189

coderabbitai · 2026-10-02T14:03:33Z

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📒 Files selected for processing (2)

.changeset/inject-source-order-pre.md
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packages/devtools-vite/src/plugin.ts

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📝 Walkthrough

Walkthrough

The source-injection transform now runs before transforms without order: 'pre'. An integration test checks that client and SSR output use the same source location. A patch changeset records the update.

Changes

Source-injection ordering

Layer / File(s)	Summary
Set and verify source-injection order `packages/devtools-vite/src/plugin.ts`, `packages/devtools-vite/tests/inject-source-order.test.ts`, `.changeset/inject-source-order-pre.md`	The transform declares `order: 'pre'`; another `pre` transform may still run first. An integration test checks that client and SSR output both contain `App.tsx:2:10`. The changeset records the patch.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 39d33

The change is ready to merge after normal checks; the supplied evidence identifies no actionable risk.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 4f638

The change runs source annotation earlier while preserving its development-mode gate, configuration controls, and file exclusions. No new security exposure was identified in the reviewed flow. Compatibility with arbitrary third-party transform plugins remains unverified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The changed processing scope is source code handled by the enabled injection plugin in development mode, including client and SSR transforms. Earlier execution changes what neighboring plugins receive, but the reviewed diff does not broaden the application gate or add network, credential, or persistent-storage authority.

Trust Boundaries and Controls

observed — Before and after the change, source injection requires development mode and injectSource.enabled. The hook retains exclusions for node_modules, raw requests, dist, and build paths, and forwards the existing ignore configuration to the same annotation helper. Scheduling changes; these controls do not.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The change addresses the coding requirements in [`#405`] and [`#189`]. `@tanstack/devtools:inject-source` now uses `transform.order: 'pre'`, in addition to `enforce: 'pre'`, so it runs before transforms w…
Out of Scope Changes check	✅ Passed	The changes stay within the linked issue scope. They update source-injection ordering, add a focused hydration regression test, and add a package changeset. The test fixture reproduces the environment…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Title check	✅ Passed	The title clearly and concisely describes the main change: source injection now runs before other plugins' transforms.
Description check	✅ Passed	The description is complete and directly explains the motivation, implementation, testing, release impact, linked issues, and risk. It clearly states that the full pnpm test:pr command was not run, wh…

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nx-cloud · 2026-10-02T14:04:02Z

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pkg-pr-new · 2026-10-02T14:04:37Z

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commit: 39d3355

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Inline comments:
Review comments at @packages/devtools-vite/src/plugin.ts:
- Line 67: Update the comment accompanying the transform hook’s order setting to
clarify that it runs before normal and post hooks but does not take precedence
over an earlier order: 'pre' transform; keep the change scoped to accurately
describing this ordering behavior.

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fix(devtools-vite): inject data-tsd-source before other plugins transform - #548

fix(devtools-vite): inject data-tsd-source before other plugins transform#548
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