swc-project/swc - CodSpeed

swc

Blog Docs Changelog

Performance History

Latest Results

fix(es/minifier): Measure nested Math calls in the fold size guard Arguments coerced by cast_to_number, such as the string in Math.sqrt("2"), previously bypassed the size guard and were folded even when the literal was longer than the call. Measure string, boolean, null and unary arguments, and recurse into nested Math calls so Math.ceil(Math.sqrt(2)) still folds; decline the fold when the length cannot be determined.

YosefBlandin:feat/minifier-math-constant-folding

14 hours ago

docs(es/minifier): Document the unshadowed Math assumption Adds an exec test covering negative folded results in member-object position, which the fixer already parenthesizes.

YosefBlandin:feat/minifier-math-constant-folding

1 day ago

feat(es/minifier): Evaluate Math.floor, Math.ceil, Math.round and Math.sqrt Extends eval_as_number with four more Math methods, guarded so a call is only replaced when the resulting literal is strictly shorter than the call itself. Math.round is implemented against the ECMA-262 rule (ties round towards +Infinity) rather than f64::round, which rounds ties away from zero and disagrees on every negative half.

YosefBlandin:feat/minifier-math-constant-folding

1 day ago

feat(es/minifier): Evaluate Math.floor, Math.ceil, Math.round and Math.sqrt Extends eval_as_number with four more Math methods, guarded so a call is only replaced when the resulting literal is strictly shorter than the call itself. Math.round is implemented against the ECMA-262 rule (ties round towards +Infinity) rather than f64::round, which rounds ties away from zero and disagrees on every negative half.

YosefBlandin:feat/minifier-math-constant-folding

1 day ago

fix(react-compiler): preserve TypeScript function overload signatures (#12115) **Description:** Preserve whether a function originally had an implementation body when converting through the React Compiler AST. React Compiler's `FunctionDeclaration` representation always contains a block body. The SWC converter therefore synthesized an empty block for TypeScript overload signatures, but the reverse conversion did not restore the original missing body. The TypeScript transform then treated every overload signature as a concrete runtime function, producing duplicate default exports. This change records the original body presence in `PreservedAst` and restores `None` for overload signatures. The integration test forces React Compiler output with `compilationMode: "all"` and verifies that the overloads remain bodyless while the implementation retains its body. Validation: - `cargo fmt --all` - `cargo test -p swc_ecma_react_compiler` - `cargo clippy --all --all-targets -- -D warnings` **BREAKING CHANGE:** None. **Related issue (if exists):** https://github.com/web-infra-dev/rspack/issues/15158

main

2 days ago

chore: Add changeset

CPunisher:codex/fix-cargo-deny-lru-advisory

2 days ago

chore: Add changeset

codex/fix-react-compiler-default-overload

2 days ago

chore: Update star history chart URL The current star history chart is broken due to GitHub stargazer API restrictions. Update the chart to use a working alternative.

PingouinFerreux:fix/star-history-chart

2 days ago

Latest Branches

0%

feat(es/minifier): Evaluate Math.floor, Math.ceil, Math.round and Mat…#12117

14 hours ago

0b9ce5d

YosefBlandin:feat/minifier-math-constant-folding

0%

chore(deps): Update lru to 0.18.2 to fix cargo deny#12116

2 days ago

dbc4a4e

CPunisher:codex/fix-cargo-deny-lru-advisory

0%

fix(react-compiler): preserve TypeScript function overload signatures#12115

2 days ago

15d0b4f

codex/fix-react-compiler-default-overload

© 2026 CodSpeed Technology

Home Terms Privacy Docs