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# Releases
## enhanced-resolve@5.21.1

### Patch Changes

- Allocation-free reductions on hot-path code: hoist `/#/g`, `/\$/g` and
`/\\/g` to module-level constants and gate the corresponding `.replace`
calls behind `includes(…)` so paths/queries/requests without the match
char skip the regex state machine entirely (the common case); share a
single `EMPTY_NO_MATCH` tuple instead of allocating `[[], null]` per "no
match" / "no condition matched" return; switch `directMapping`'s
`for...of` over `mappingTarget` and inner results to indexed loops to
avoid iterator-object allocation per call; inline `isConditionalMapping`
at its two hot-path call sites and merge the duplicate `default` /
`conditionNames.has(condition)` branches in `computeConditionalMapping`;
replace `invalidSegmentRegEx.exec(…) !== null` with `.test(…)` (no
match-array allocation); drop the dead
`deprecatedInvalidSegmentRegEx.test(…) !== null` clause in
`ImportsFieldPlugin` (`.test` returns boolean; `true !== null` and
`false !== null` are both true, so it was `&& true`); drop the redundant
`relativePath.length === 0` guard before `!startsWith("./")` in
`ExportsFieldPlugin` (the empty-string case is already covered). (by
[@alexander-akait](https://github.com/alexander-akait) in
[#558](#558))

- restore plugin compatibility for `[...resolveContext.stack]` iteration
(by [@alexander-akait](https://github.com/alexander-akait) in
[#569](#569))

- fix `TsconfigPathsPlugin` to support `resolveSync` with
`useSyncFileSystemCalls` (by
[@alexander-akait](https://github.com/alexander-akait) in
[#572](#572))

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