You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: entry.rs
    path of file: ./repos/swc/crates/swc_ecma_preset_env/src/corejs2
    
    the code of the file until where you have to start completion: use indexmap::IndexSet;
use preset_env_base::{version::should_enable, Versions};
use swc_atoms::js_word;
use swc_common::{collections::ARandomState, DUMMY_SP};
use swc_ecma_ast::*;
use swc_ecma_visit::{noop_visit_mut_type, VisitMut, VisitMutWith};

use super::builtin::BUILTINS;

#[derive(Debug)]
pub struct Entry {
    is_any_target: bool,
    target: Versions,
    pub imports: IndexSet<&'static str, ARandomState>,
}

impl Entry {
    pub fn new(target: Versions, regenerator: bool) -> Self {
        let is_any_target = target.is_any_target();
        let is_web_target = target.into_iter().any(|(k, v)| {
            if k == "node" {
                return false;
            }

            v.is_some()
        });

        let mut v = Entry {
            is_any_target: target.is_any_target(),
            target,
            imports: Default::default(),
        };
        if is_any_target || is_web_target {
            v.imports.insert("web.timers");
            v.imports.insert("web.immediate");
            v.imports.insert("web.dom.iterable");
        }

        if regenerator {
            v.imports.insert("regenerator-runtime/runtime.js");
        }

        v
    }

   
    
    fn visit_mut_module_items(&mut self, items: &mut Vec<ModuleItem>) {
        items.retain_mut(|item| {
            item.visit_mut_children_with(self);
            if let ModuleItem::Stmt(Stmt::Expr(ExprStmt { expr, .. })) = &item {
                if let Expr::Call(CallExpr {
                    callee: Callee::Expr(callee),
                    ref args,
                    ..
                }) = &**expr
                {
                    if callee.is_ident_ref_to("require")
                        && args.len() == 1
                        && if let ExprOrSpread { spread: None, expr } = &args[0] {
                            if let Expr::Lit(Lit::Str(s)) = &**expr {
                                s.value == *"core-js"
                                    || s.value == *"@swc/polyfill"
                                    || s.value == *"@babel/polyfill"
                            } else {
                                false
                            }
                        } else {
                            false
                        }
                        && self.add_all("@swc/polyfill")
                    {
                        return false;
                    }
                }
            }
            true
        })
    }