perf(minifier): use Vec::with_capacity for inline template expressions

Boshen · claude · Boshen · commit 6b4377d399df · 2026-03-14T23:56:01.000+08:00
Pre-allocate the Vec based on the number of expressions to avoid
incremental reallocations.

Co-Authored-By: Claude Opus 4.6 (1M context) &lt;noreply@anthropic.com&gt;
diff --git a/crates/oxc_minifier/src/peephole/fold_constants.rs b/crates/oxc_minifier/src/peephole/fold_constants.rs
@@ -724,7 +724,7 @@ impl<'a> PeepholeOptimizations {
             return;
         }
 
-        let mut inline_exprs = Vec::new();
+        let mut inline_exprs = Vec::with_capacity(t.expressions.len());
         let new_exprs =
             ctx.ast.vec_from_iter(t.expressions.drain(..).enumerate().filter_map(|(idx, expr)| {
                 if expr.may_have_side_effects(ctx) {

Original file line number	Diff line number	Diff line change
`@@ -724,7 +724,7 @@ impl<'a> PeepholeOptimizations {`
`724`	`724`	`return;`
`725`	`725`	`}`
`726`	`726`
`727`		`- let mut inline_exprs = Vec::new();`
	`727`	`+ let mut inline_exprs = Vec::with_capacity(t.expressions.len());`
`728`	`728`	`let new_exprs =`
`729`	`729`	`ctx.ast.vec_from_iter(t.expressions.drain(..).enumerate().filter_map(\|(idx, expr)\| {`
`730`	`730`	`if expr.may_have_side_effects(ctx) {`