Fix trailing slash

[jp-knj]

Changes

• Fix Astro.url.pathname returns trailing slash on index page when base is set and trailingSlash is 'never' #13736: when base: '/base' is used with trailingSlash: 'never', the root page now returns /base (no trailing slash) instead of /base/.

• Path helpers updated

  • astro/src/core/runtime/utils/path.ts
  • internal-helpers/src/path.ts
    Both helper functions now:
  • keep / untouched
  • remove exactly one trailing slash from any other path

• Unit-test enhanced

  • packages/astro/test/units/routing/trailing-slash.test.js

    • adds an echo handler for /
    • new assertion confirms the pathname is /base

• No behaviour change for trailingSlash: 'always' or non-root routes.

Changeset generated: pnpm exec changeset (patch release)

---

Testing

• Rebuilt helpers & core:
  pnpm --filter internal-helpers build && pnpm --filter astro build
• Ran updated suite:
  node --test packages/astro/test/units/routing-trailing-slash.test.js → all 9 tests pass (1 failed before).
• Full repo: pnpm test → green.

No additional e2e required; unit test covers the regression.

---

Docs

No doc updates required—behaviour now matches existing documentation.

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