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fix(router)!: resolve . / .. segments in patterns like URLPattern - #246
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📝 WalkthroughWalkthroughRoute patterns now resolve literal ChangesPattern resolution
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to An invalid removal pattern can remove a working route. Validate the input before normalization prior to merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Canonicalization changes which routes patterns identify. A malformed removal pattern can now resolve to—and delete—a valid route that the original pattern could not register. The impact is bounded to callers with route-removal access; no new request-only bypass was established. Retained concerns
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Review comments at @src/operations/remove.ts:
- Line 32: Update removeRoute to validate the absolute input with
checkConstraints before passing it to dotSegments, and return without removing a
route if validation fails. Preserve existing handling of reserved modifiers and
dot segments adjacent to dynamic syntax.
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.agents/regexp.md.agents/syntax.mdAGENTS.mdREADME.mdsrc/_group-delimiters.tssrc/operations/_utils.tssrc/operations/add.tssrc/operations/remove.tssrc/regexp-to-route.tssrc/regexp.tstest/_regexp-cases.tstest/bench/bundle.test.tstest/regexp-to-route.test.tstest/route-node-keys.test.tstest/router.test.tstest/scenarios/encoding.jsontest/wpt.test.ts
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- test/wpt.test.ts
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`/foo/../bar` is `/bar` (`%2e` too, an escaped `\.\.` stays literal); next to a param, catch-all or group they throw. Part of #243.
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Part of #243.
./..segments in a pattern are now resolved likenew URL()resolves a path, as URLPattern does. Before, they were read as literal segments, so WPT's/foo/../bar(which is/barin URLPattern) only matched the raw path/foo/../bar./foo/../baris/bar,/a/./bis/a/b, and/../ais/a(a..at the root stays there)./a/b/..is/a/, which is the same route as/a. Empty segments count as segments:/a//../bis/a/b.%2e,.%2E,%2e%2e), as in URLPattern andnew URL()./\.\./barmatches/../bar,\%2e\%2ekeeps%2e%2e)...x,...and..:xare not dot segments.normalize.Where rou3 throws instead of copying URLPattern
URLPattern canonicalizes each fixed-text part of a pattern on its own, and the
/before a:name/*/(…)belongs to that param. Next to dynamic syntax, its result therefore stops being a path:/:id/../:id/(the..is dropped)/a/../:id//:id/a/./*/a//*/a{/..}?/b/a{/}?/b/a/..{x}?/b/{x}?/bThese now throw
rou3: `.` / `..` segment next to a param, catch-all or group (<pattern>)throughinvalidSyntax(). The rule:..that would remove a segment that isn't plain text;:,*or(;{…}group (checked per expansion inexpandGroupDelimiters).Where the whole-path result is the same as URLPattern's, the pattern is resolved:
/:id/a/../bis/:id/b/a/../b-:idis/b-:id/a/./{b}?is/a/{b}?/a{/b/../c}?is/a{/c}?Implementation
dotSegments()(operations/_utils.ts) is the one rule.addRoute,removeRouteandrouteToRegExpcall it right afterabsolutePattern/checkConstraints. It bails early with oneDOT_SEGMENTtest, and errors quote the pattern as written.routeNodeKeys, overlap and the compiler pick it up through the realaddRoute. Registration identities belong to the resolved pattern, soremoveRoute("/docs/../api")removes/api, and the reverse works too.regExpToRouteescapes a literal dot segment (literalDots), so^\/\.\.\/…round-trips. The/{/(\d+)}?/.fixture is now/{/(\d+)}?/\..URLPattern behaviors not mirrored
/\.\./barto/bartoo. rou3 keeps an escaped dot literal, as Pattern syntax: reject or resolve silent URLPattern divergences #243 asks. That is the only way to match a raw..that the caller didn't normalize, and URLPattern inputs never contain one anyway.{..}without a modifier: URLPattern reads/a/{..}/bas/b. rou3 throws, because a dot segment in a group is reserved.../fooand./fooget a/and resolve to/foo. URLPattern keeps them relative, which was already a listed WPT diff./a/.:xis/a/{:x}there, so it matches/a/foo, and/a/..:xis/{:x}. rou3 still reads.:xas a literal.followed by:x.Tests
router.test.tsgets a new "./..segments in patterns" block. For each resolve case it comparesfindRoute, JIT and AOT with the resolved route over a set of paths. It also checks thatrouteToRegExpgives the same source, thatrouteNodeKeysagrees, thatcompareRoutesreturns"equal", and that removal works by either spelling. A separate test checks the result against the runtime'sURLPatterncanonicalization. It also covers escaped dots staying literal,regExpToRouteround-trips, and 30 rejected patterns, which must throw inaddRoute,routeToRegExp,routeNodeKeysandremoveRoute../..segments in patterns" intest/scenarios/encoding.json, includinginvalidpatterns.KNOWN_DIFFSentry/foo/../bar → /bar, since it now agrees with URLPattern. TherouteNodeKeysencoding sweep skips./.., which have no node of their own.bundle.test.ts.pnpm test(lint, tsc, vitest): 18 files, 3787 passed. The affected suites also pass with--no-js-regexp-duplicate-named-groups(the Node 22 simulation).Docs: README (new "Dot segments" section, invalid patterns, the URLPattern differences and edge cases tables, path normalization, removal, regex notes),
.agents/syntax.md(pipeline, "Dot segments", reserved syntax),.agents/regexp.mdandAGENTS.md.🤖 Generated with AI assistant
Summary by CodeRabbit
.and..segments like URLs, including percent-encoded dot segments. Equivalent patterns work consistently for matching, comparison, and removal.