swc-project/swc - CodSpeed

swc

Blog Docs Changelog

Performance History

Latest Results

fix(es/parser): Export `TokenFlags` from `unstable` (#12751) **Description:** The public `Tokens` trait uses `TokenFlags` in `update_token_flags` and `token_flags`. `TokenFlags` was private to the crate. Because of this, no crate outside the parser could implement `Tokens`. This PR exports `TokenFlags` from `swc_ecma_parser::unstable`, next to the other token types. It also adds an integration test. The test wraps `Lexer` in a `Tokens` implementation from outside the crate and parses a module with it. Local validation: `cargo test -p swc_ecma_parser` passed. `cargo test -p swc_ecma_parser --features unstable --test unstable_tokens` passed. `cargo clippy -p swc_ecma_parser --all-targets --features unstable -- -D warnings` passed. I did not run the workspace-wide `cargo clippy --all`. CI has not run yet. **BREAKING CHANGE:** None. **Related issue (if exists):** Closes #12747 Co-authored-by: mellyeliu <64865235+mellyeliu@users.noreply.github.com> Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

main

2 hours ago

fix(es/parser): Allow private brand checks in Flow mode (#12752) **Description:** Flow mode rejected every `#name` inside an expression. This also rejected the valid private brand check `#x in o`, which failed with `Expected an identifier`. Now Flow mode accepts `#name` only as the direct left operand of an `in` that binds tighter than the enclosing operator. This is the rule Babel uses. `#x;`, `(#x) in o`, `-#x in o` and `1 + #x in o` still error, so the Hermes behavior from #11699 is kept. Tests: new Flow fixtures cover the valid brand checks (`#x in o`, `o != null && #x in o`, `true == #x in o`) and the four invalid positions. I ran `cargo test -p swc_ecma_parser --all-features` (all passed, including the Hermes parity tests), `cargo fmt --all` and `cargo clippy -p swc_ecma_parser --all-targets --all-features -- -D warnings` (clean) on the final code. I did not run the workspace-wide clippy. **BREAKING CHANGE:** None. **Related issue (if exists):** Closes #12748 --------- Co-authored-by: mellyeliu <64865235+mellyeliu@users.noreply.github.com> Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

main

2 hours ago

fix(es/parser): Export `TokenFlags` from `unstable` The public `Tokens` trait uses `TokenFlags` in `update_token_flags` and `token_flags`, but the type was private. Crates outside the parser could not implement `Tokens`. Export it from `swc_ecma_parser::unstable` next to the other token types. Co-authored-by: mellyeliu <64865235+mellyeliu@users.noreply.github.com> Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

kdy1/fix-issue-12747

3 hours ago

Merge branch 'main' into perf/minifier-pure-traversal

perf/minifier-pure-traversal

3 hours ago

chore: Add changeset Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

kdy1/fix-issue-12748

3 hours ago

fix(es/parser): Allow top-level `for await` in Flow modules The Flow-only `for await` check in `parse_for_stmt` also ran under `parse_module`, so `for await (const x of y) {}` at the top level of a module failed to parse. Top-level await makes this valid in modules, so skip the check when the module context is active. Scripts, regular functions and static blocks still report an error. Fixes #12749 Co-authored-by: mellyeliu <64865235+mellyeliu@users.noreply.github.com> Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

kdy1/fix-issue-12749

3 hours ago

Merge branch 'main' into fix/minifier-import-live-bindings

fix/minifier-import-live-bindings

3 hours ago

docs: add combined native and btrfs benchmark results

jdalton:perf/native-btrfs-codec-fallback

8 hours ago

Latest Branches

0%

fix(es/parser): Export `TokenFlags` from `unstable`#12751

3 hours ago

e432385

kdy1/fix-issue-12747

0%

perf(es/minifier): Avoid repeated simplification of unused values#12736

3 hours ago

18870ae

perf/minifier-pure-traversal

+4%

fix(es/parser): Allow private brand checks in Flow mode#12752

3 hours ago

8d17bf2

kdy1/fix-issue-12748

© 2026 CodSpeed Technology

Home Terms Privacy Docs