Get variable name by call stack in NODE.JS (unsafe code)

getName.ts

import fs from "fs";
import { resolve } from "path";

function getVarName(variable: any): string {
  const stack2: string = new Error().stack.split(/at/g)[2].trim();

  const splitted = stack2.substr(20, stack2.length - 21).split(/:/);

  const lineAndPosition = splitted.slice(2).map(item => parseInt(item));

  const fileData = fs.readFileSync(
    resolve(splitted.slice(0, 2).join(":")),
    "utf8"
  );

  const line = fileData.split("\n")[lineAndPosition[0] - 1];

  let state: 0 | 1 = 0;
  let name: string = "";

  for (let i = lineAndPosition[1] - 1; i < line.length; i++) {
    if (line[i] === "(") {
      state = 1;
      continue;
    }
    if (line[i] === ")") {
      state = 0;
      continue;
    }

    if (state === 1) name += line[i];
  }

  if (!/^[A-Za-z0-9$]+$/i.test(name)) return;

  return name;
}