Callstack for javascript

callstack.ts

import { sep } from 'path';

function splitPath(filename, level: number) {
  const paths = filename.split(sep);
  return paths.splice(paths.length - level).join(sep);
}

export function caller(level: number) {
  const oldStackTrace = Error.prepareStackTrace;
  try {
    // eslint-disable-next-line handle-callback-err
    Error.prepareStackTrace = (err, structuredStackTrace) =>
      structuredStackTrace;
    Error.captureStackTrace(this);
    const callSite = this.stack[level];
    return (
      splitPath(callSite.getFileName(), 2) + ':' + callSite.getLineNumber()
    );
  } finally {
    Error.prepareStackTrace = oldStackTrace;
  }
}