swc_constify 0.36.0

AST Transforms for swc constify plugin
Documentation 
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use rustc_hash::FxHashSet;
use swc_ecma_ast::{
    BlockStmtOrExpr, Constructor, Function, GetterProp, Id, Ident, MemberProp, PropName, SetterProp,
};
use swc_ecma_visit::{noop_visit_type, visit_obj_and_computed, Visit, VisitWith};

pub(crate) fn ids_used_by<N>(n: &N) -> FxHashSet<Id>
where
    N: VisitWith<IdentUsageCollector>,
{
    let mut v = IdentUsageCollector {
        ignore_nested: false,
        ..Default::default()
    };
    n.visit_with(&mut v);
    v.ids
}

pub(crate) fn ids_used_by_ignoring_nested<N>(n: &N) -> FxHashSet<Id>
where
    N: VisitWith<IdentUsageCollector>,
{
    let mut v = IdentUsageCollector {
        ignore_nested: true,
        ..Default::default()
    };
    n.visit_with(&mut v);
    v.ids
}

#[derive(Default)]
pub(crate) struct IdentUsageCollector {
    ids: FxHashSet<Id>,
    ignore_nested: bool,
}

impl Visit for IdentUsageCollector {
    noop_visit_type!();

    visit_obj_and_computed!();

    fn visit_block_stmt_or_expr(&mut self, n: &BlockStmtOrExpr) {
        if self.ignore_nested {
            return;
        }

        n.visit_children_with(self);
    }

    fn visit_constructor(&mut self, n: &Constructor) {
        if self.ignore_nested {
            return;
        }

        n.visit_children_with(self);
    }

    fn visit_function(&mut self, n: &Function) {
        if self.ignore_nested {
            return;
        }

        n.visit_children_with(self);
    }

    fn visit_getter_prop(&mut self, n: &GetterProp) {
        if self.ignore_nested {
            return;
        }

        n.visit_children_with(self);
    }

    fn visit_setter_prop(&mut self, n: &SetterProp) {
        if self.ignore_nested {
            return;
        }

        n.visit_children_with(self);
    }

    fn visit_ident(&mut self, n: &Ident) {
        self.ids.insert(n.to_id());
    }

    fn visit_member_prop(&mut self, n: &MemberProp) {
        if let MemberProp::Computed(..) = n {
            n.visit_children_with(self);
        }
    }

    fn visit_prop_name(&mut self, n: &PropName) {
        if let PropName::Computed(..) = n {
            n.visit_children_with(self);
        }
    }
}