feat: match redirects with @netlify/redirect-matcher

[paulo]

Summary

netlify dev matches redirects with netlify-redirector, a 2018 Emscripten build that is no longer maintained. This switches it to @netlify/redirect-matcher, its WebAssembly successor. @netlify/dev already uses that package through @netlify/redirects (netlify/primitives#800), so after this the CLI ships a single matcher.

Changes

• src/utils/rules-proxy.ts: builds the matcher with createMatcher and passes it a plain request object (headers, cookies) instead of getHeader/getCookie callbacks. Reloading rules when _redirects or netlify.toml changes still works. The build is now cached as a promise, so concurrent first requests share one matcher, and a reload during a build can no longer leave the old rules cached (both happened before this change too). A failed build is cleared, so the next request retries it. Parse errors from the matcher are now logged; netlify-redirector never reported them.
• src/utils/proxy.ts: reads the new result shape: type: 'match' | 'forcedNotFound', and signer?.jwtSecret instead of signingSecret. isExternal is now a type guard.
• Dead code removed: the role re-check in serveRedirect that decoded nf_jwt when a match carried exceptions.JWT. netlify-redirector only set that field together with force404, and force404 is handled first with an early return, so the block could never run. I checked this against both packages, using no token, a valid token, the wrong role, an expired token, and a bad signature; both return a forced 404 in every case except the valid token.
• types/netlify-redirector is deleted, since the new package ships its own types.
• Dependencies
  • netlify-redirector removed, @netlify/redirect-matcher@^0.4.2 added.
  • @netlify/dev ^5.1.6, so the tree no longer contains netlify-redirector.
  • @netlify/dev-utils ^6.0.3 and @netlify/blobs ^11.1.3: the versions the new primitives packages pin. Without the dev-utils bump, @netlify/server-dev gets its own copy and FileWatcher from the CLI no longer type-checks against it.
  • dot-prop moves to devDependencies: its only runtime use was the removed role re-check, and integration tests still use it.
  • The lockfile otherwise only moves the other @netlify/* packages to the versions released alongside @netlify/dev@5.1.6.

Behaviour: redirect matching is unchanged, including role, country, language and signed rules. The integration tests below cover each of these.

Testing

• tests/unit/utils/rules-proxy.test.ts: 8 new createRewriter tests against real _redirects files:
  • a redirect rule matches;
  • a role rule forces a 404 without a JWT and with the wrong role, and matches with the right one;
  • a Country condition matches through nf_country, and a Language condition through Accept-Language;
  • a signed rule reports its secret name;
  • rules reload when _redirects changes.
    The first seven fail on main because of the result shape. The reload test passes on both.
• tests/unit/utils/rules-proxy-matcher.test.ts: three new tests, with the matcher package mocked. Concurrent first requests build one matcher; a failed build is retried by the next request; and a reload during the first build leads to a rebuild with the new rules. The first and third fail on main's rules-proxy.ts. The retry test passes there, because main only cached a matcher once it had been built; it guards against the promise caching introduced here.
• tests/integration/rules-proxy.test.ts: updated to assert the new result shape.
• npm run typecheck and npm run build pass, and eslint and oxfmt are clean on the changed files.
• Integration suites: rules-proxy, redirects, dev-forms-and-redirects, dev-miscellaneous, dev.config and dev. 91 pass. The one failure is redirects > fixture: next-app, which fails the same way on main locally, because I hadn't installed that fixture's dependencies (next: command not found).
• Unit suite: everything passes except generate-autocompletion's snapshot. That test fails identically on main locally (Node 25.8, option order).

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• src/utils/rules-proxy.ts
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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Redirect rules now reflect file updates reliably, including changes made while the initial setup is still in progress.
  • Conditional and signed redirects handle visitor roles, country, and language conditions more consistently.
  • External destinations and forced not-found rules are handled consistently for proxied requests, including WebSocket connections.
  • Concurrent requests share redirect-rule setup, and failed setup can be retried on a subsequent request.

Walkthrough

The redirect-rule proxy now uses @netlify/redirect-matcher and its MatchResult shape. Matcher construction is cached as a promise, cleared when redirect rules reload, and covered by tests for concurrent requests and reloads. Proxy handling now recognizes forcedNotFound results and reads signing-secret names from matcher results. The JWT-cookie exception branch and the netlify-redirector declarations were removed.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Suggested reviewers: ndhoule

Merge Risk: ⚪ Minimal · up to 2fd57

No confirmed redirect behavior or availability issue remains from the selected changes. The PR is mergeable after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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 7…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description clearly explains the migration from netlify-redirector to @netlify/redirect-matcher, related implementation changes, tests, and dependency updates.
Title check	✅ Passed	The title clearly and concisely identifies the primary change: matching redirects with @netlify/redirect-matcher.

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• Dependency count: 1,070 ⬇️ 0.19% decrease vs. 91b8aa9
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• Number of ts-expect-error directives: 343 ⬇️ 0.58% decrease vs. 91b8aa9

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Inline comments:
Review comments at @src/utils/rules-proxy.ts:
- Around line 76-91: Update getMatcher so a rejected buildMatcher promise clears
the cached matcher only if matcher still references that same promise. Preserve
promise sharing for concurrent requests and avoid clearing a newer promise
started after a rules reload.

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📒 Files selected for processing (9)

• package.json
• src/utils/proxy.ts
• src/utils/redirects.ts
• src/utils/rules-proxy.ts
• src/utils/types.ts
• tests/integration/rules-proxy.test.ts
• tests/unit/utils/rules-proxy-matcher.test.ts
• tests/unit/utils/rules-proxy.test.ts
• types/netlify-redirector/index.d.ts

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• types/netlify-redirector/index.d.ts

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