deobf javascript auto rename variable from require import method

deobf.js

var esprima = require("meriyah");
var estraverse = require("estraverse");
var escodegen = require("escodegen");
var fs = require("node:fs");


function basename(path) {
  return path.split("/").reverse()[0].split(":").reverse()[0].replace("-", "_");
}

let scope = 0;
let renamingObj = {};
function parse(ast) {
  estraverse.traverse(ast, {
    enter: function (node) {
      if (node.type === "BlockStatement" || node.type === "Program") {
        scope++;
      }
      if (node.type === "VariableDeclaration") {
        node.declarations.forEach((value) => {
          if (value.init) {
            if (
              value.init.type == "CallExpression" &&
              value.init.callee.name == "require"
            ) {
              if (value.id.type === "ObjectPattern") {
                return // don't parse
              }
              if (value.id.name === undefined) {
                console.log("bad_key", escodegen.generate(node));
              } else {
                renamingObj[value.id.name] = {
                  scope: scope,
                  name: basename(value.init.arguments[0].value),
                };
                value.id.name = basename(value.init.arguments[0].value);
              }
            }
          }
        });
      }
      if (node.type === "Identifier") {
        if (renamingObj[node.name] !== undefined) {
          node.name = renamingObj[node.name].name;
        }
      }
    },
    leave: function (node) {
      if (node.type == "Program" || node.type == "BlockStatement") {
        scope--;
        var nameList = [];
        var keys = Object.keys(renamingObj);
        keys.forEach((k) => {
          if (renamingObj[k].scope > scope) {
            nameList.push(k);
          }
        });
        nameList.forEach((k) => {
          delete renamingObj[k];
        });
      }
    },
  });
  return ast;
}

function main() {
  if (process.argv.length <= 2) {
    // node ./this.js target.js
    // generate target.ast target.deobf.js
    console.log(`Usage: node ${process.argv[1]} target.js`);
    return
  }
  let file = process.argv[2]
  let code = fs.readFileSync(file, "utf8");
  let ast = esprima.parse(code);
  ast = parse(ast);
  console.log("write to ast file");
  fs.writeFileSync(`${file}.ast`, JSON.stringify(ast));
  // console.log(escodegen.generate(ast));
  console.log("generate code ....")
  fs.writeFileSync(`${file}.deobf.js`, escodegen.generate(ast, {}));
  // console.log(renamingObj);
}

main();