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use swc_common::DUMMY_SP;
use swc_ecma_ast::*;
use swc_ecma_transforms_base::helper;
use swc_ecma_utils::ExprFactory;
use swc_ecma_visit::noop_visit_type;
use swc_ecma_visit::{noop_fold_type, Fold, FoldWith, Node, Visit, VisitWith};
pub fn instance_of() -> impl Fold {
InstanceOf
}
struct InstanceOf;
impl Fold for InstanceOf {
noop_fold_type!();
fn fold_expr(&mut self, expr: Expr) -> Expr {
fn should_work(node: &Expr) -> bool {
struct Visitor {
found: bool,
}
impl Visit for Visitor {
noop_visit_type!();
fn visit_bin_expr(&mut self, e: &BinExpr, _: &dyn Node) {
if e.op == op!("instanceof") {
self.found = true
}
}
}
let mut v = Visitor { found: false };
node.visit_with(&Invalid { span: DUMMY_SP } as _, &mut v);
v.found
}
if !should_work(&expr) {
return expr;
}
let expr = expr.fold_children_with(self);
match expr {
Expr::Bin(BinExpr {
span,
left,
op: op!("instanceof"),
right,
}) => Expr::Call(CallExpr {
span,
callee: helper!(span, instanceof, "instanceof"),
args: vec![left.as_arg(), right.as_arg()],
type_args: Default::default(),
}),
_ => expr,
}
}
}