feat(minifier): collapse var into for loop initializer

`var a = 0; for(;a<0;a++) {}` => `for(var a = 0;a<0;a++) {}`
oxc-project · Dec 26, 2024 · 6055075 · 6055075
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commit 6055075
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diff --git a/crates/oxc_ast/src/ast_impl/js.rs b/crates/oxc_ast/src/ast_impl/js.rs
@@ -886,6 +886,11 @@ impl fmt::Display for VariableDeclarationKind {
 }
 
 impl ForStatementInit<'_> {
+    /// Is `var` declaration
+    pub fn is_var_declaration(&self) -> bool {
+        matches!(self, Self::VariableDeclaration(decl) if decl.kind.is_var())
+    }
+
     /// LexicalDeclaration[In, Yield, Await] :
     ///   LetOrConst BindingList[?In, ?Yield, ?Await] ;
     pub fn is_lexical_declaration(&self) -> bool {