Fix build failure for dynamic file endpoints with trailingSlash "always" by astrobot-houston · Pull Request #17246 · withastro/astro

astrobot-houston · 2026-06-30T22:06:59Z

Changes

Dynamic file endpoints (e.g. [name].json.ts) no longer get a trailing slash appended during build when trailingSlash: "always" is configured. This was causing TypeError: Missing parameter because the generated path /api/foo.json/ didn't match the route's own regex pattern (which already used 'never' for file endpoints after Fix trailing slash handling for dynamic file endpoints in dev mode #17224).
Fix is in stringifyParams: override trailingSlash to 'never' when the route is an endpoint with a file extension, matching what trailingSlashForPath produces in create-manifest.ts.

Testing

Added 3 test cases to packages/astro/test/units/routing/generator.test.ts:
- Regression case: dynamic file endpoint with trailingSlash: 'always' produces path without trailing slash
- Guard: page routes still receive trailing slashes as expected
- Baseline: endpoints without file extensions are unaffected

Docs

No docs update needed — this restores already-documented behavior for trailingSlash: "always" with file endpoints.

…17241)\n\nOverride trailingSlash to 'never' in stringifyParams for endpoint routes\nwith file extensions, matching the route pattern generated by\ntrailingSlashForPath in create-manifest.ts. This fixes a regression from\n#17224 where dynamic file endpoints (e.g. [name].json.ts) with\ntrailingSlash: 'always' would fail to build with TypeError: Missing\nparameter."

changeset-bot · 2026-06-30T22:07:05Z

🦋 Changeset detected

Latest commit: 4844547

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 395 packages

Name	Type
astro	Patch
@e2e/astro-linked-lib	Patch
@e2e/actions-blog	Patch
@e2e/actions-react-19	Patch
@e2e/astro-component	Patch
@e2e/astro-envs	Patch
@e2e/astro-island-hydration-error	Patch
@test/astro-cloudflare-node-prerender-mdx	Patch
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@test/nested-style-bug-e22e	Patch
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@e2e/server-islands-key	Patch
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@performance/md	Patch
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fake-astro-library	Patch
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custom-fetch-error-pages	Patch
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codspeed-hq · 2026-06-30T22:13:38Z

Merging this PR will not alter performance

✅ 18 untouched benchmarks

_{Comparing triagebot/fix-17241 (4844547) with main (ed92e31)¹}

No successful run was found on main (6a99600) during the generation of this report, so ed92e31 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

ematipico · 2026-07-01T05:47:22Z

+	// File endpoints (e.g. [name].json.ts) should never have a trailing slash,
+	// even when trailingSlash is set to 'always'. This matches the route pattern
+	// generated by trailingSlashForPath in create-manifest.ts.
+	const effectiveTrailingSlash =
+		route.type === 'endpoint' && hasFileExtension(route.route) ? 'never' : trailingSlash;


I don't like that we recompute this information. Since it's already computed, maybe we should pass it to downstream functions instead

The bot doesn't read these, so if you want to change it you can just push to the PR.

Yeah but what you think? Does it make sense? Is it possible? Asking for feedback

Where else is it computed?

yanthomasdev · 2026-07-07T18:46:07Z

This issue has been blocking me to migrate to Astro v7, I went with passing trailingSlash through RouteData, feel free to revert if you'd rather go with another approach 🙌

astrobot-houston added the fix verified Reporter confirmed the triage bot fix works label Jun 30, 2026

astrobot-houston mentioned this pull request Jun 30, 2026

Build Failure for Dynamic File Endpoints in projects with Trailing Slash "always" #17241

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github-actions Bot added the pkg: astro Related to the core `astro` package (scope) label Jun 30, 2026

ematipico reviewed Jul 1, 2026

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Legend-Master mentioned this pull request Jul 5, 2026

Update astro & starlight packages tauri-apps/tauri-docs#3949

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yanthomasdev added 2 commits July 7, 2026 14:03

Merge branch 'main' into triagebot/fix-17241

9995e95

Use route-specific trailingSlash in RouteData

4844547

github-actions Bot added the docs pr label Jul 7, 2026

winterqt mentioned this pull request Jul 7, 2026

Fix static build crash for file-extension endpoint routes with trailingSlash: "always" #17320

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Fix build failure for dynamic file endpoints with trailingSlash "always"#17246

Fix build failure for dynamic file endpoints with trailingSlash "always"#17246
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