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perf(parser): make pushing tokens faster #19960

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Merged
graphite-app merged 1 commit into from
Mar 3, 2026
Merged

perf(parser): make pushing tokens faster #19960

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6 changes: 5 additions & 1 deletion crates/oxc_parser/src/lexer/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -302,7 +302,11 @@ impl<'a, C: Config> Lexer<'a, C> {
let token = self.token;
if self.config.tokens() {
match mode {
FinishTokenMode::Push => self.tokens.push(token),
FinishTokenMode::Push => {
// We allocated sufficient capacity in the `Vec` for all tokens at the start.
// `push_fast` is optimized for the "doesn't need to grow" case.
self.tokens.push_fast(token);
}
FinishTokenMode::Replace => {
debug_assert!(
self.tokens.last().is_some_and(|last| last.start() == token.start())
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