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Performance History

Latest Results

perf(formatter_core): cache queue cursor and top call-stack frame in printer hot loops

perf/formatter-printer-hot-loops

1 minute ago

feat(minifier): drop dead trailing arguments to functions that ignore them At a call site of an identifier that resolves to a known function literal, drop trailing arguments the callee can never read — those bound to unused parameters and those passed beyond the declared parameter list — stopping at the first side-effectful argument. This matches Rollup/Terser and shrinks real bundles (e.g. `await foo({ bar: 'baz' })` -> `await foo()`). The recorder now stores a `FunctionSummary` with an independent `dead_arg_prefix` fact (async/generator/effectful bodies allowed) alongside the existing purity fact, gated on no rest param, no direct eval, non-script-root binding, and — for non-arrows — a strict scope with no `arguments` reflection. closes #23866

minifier-drop-dead-call-args

1 hour ago

test(minifier): update minsize snapshot after rebase onto main

property-mangling

1 hour ago

docs(minify): correct property mangling name-order and errors docs The README claimed mangled names are ordered by per-program frequency, but assign() sorts candidates alphabetically and never counts occurrences — the gzip-friendly part is only the frequency-tuned base54 alphabet. Also document that MinifyResult.errors now carries Warning-severity advisories (the whole-file property-mangle bail), so callers should check severity instead of treating any entry as fatal.

property-mangling

1 hour ago

fix(minifier): remove stale pure_functions entries for redeclared symbols Redeclarations of a symbol (e.g. a conditionally-redeclared `var`, or duplicate `function` declarations in a sloppy script) are span-only in oxc_semantic and create no references, so the read-only-refs check in try_save_pure_function can't see them. If an earlier declaration is pure but a later, runtime-winning redeclaration is not, the stale entry survived and caused call sites to be folded away, silently dropping the impure declaration's side effects.

minifier-pure-functions-redecl-staleness

2 hours ago

feat(minifier): drop dead trailing arguments to functions that ignore them At a call site of an identifier that resolves to a known function literal, drop trailing arguments the callee can never read — those bound to unused parameters and those passed beyond the declared parameter list — stopping at the first side-effectful argument. This matches Rollup/Terser and shrinks real bundles (e.g. `await foo({ bar: 'baz' })` -> `await foo()`). The recorder now stores a `FunctionSummary` with an independent `dead_arg_prefix` fact (async/generator/effectful bodies allowed) alongside the existing purity fact, gated on no rest param, no direct eval, non-script-root binding, and — for non-arrows — a strict scope with no `arguments` reflection. closes #23866

minifier-drop-dead-call-args

2 hours ago

feat(minifier): drop dead trailing arguments to functions that ignore them At a call site of an identifier that resolves to a known function literal, drop trailing arguments the callee can never read — those bound to unused parameters and those passed beyond the declared parameter list — stopping at the first side-effectful argument. This matches Rollup/Terser and shrinks real bundles (e.g. `await foo({ bar: 'baz' })` -> `await foo()`). The recorder now stores a `FunctionSummary` with an independent `dead_arg_prefix` fact (async/generator/effectful bodies allowed) alongside the existing purity fact, gated on no rest param, no direct eval, non-script-root binding, and — for non-arrows — a strict scope with no `arguments` reflection. closes #23866

minifier-drop-dead-call-args

2 hours ago

perf(parser): use `ReplaceWith` instead of `TakeIn`

om/07-01-perf_parser_use_replacewith_instead_of_takein_

4 hours ago

Latest Branches

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feat(minifier): drop dead trailing arguments to functions that ignore them#24060

20 hours ago

baa8186

minifier-drop-dead-call-args

0%

feat(minifier): support property name mangling (mangleProps)#23772

1 hour ago

8aa5cc4

property-mangling

0%

fix(minifier): remove stale pure_functions entries for redeclared symbols#24059

21 hours ago

55dd4f8

minifier-pure-functions-redecl-staleness

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