v1.1.4 generates code with syntax error

[satazor]

v1.1.4 generates code with syntax error. The follow code is injected in the built files:

function (filepath, extMapping) {
  if (!filepath.startsWith('./') && !filepath.startsWith('../')) {
    // Package import
    return filepath;
  }
  const idx = filepath.lastIndexOf('.');
  if (idx === -1 || filepath.includes('/', idx)) {
    // No extension
    const newExt = extMapping[''];
    if (newExt) {
      return filepath + newExt;
    }
    return filepath;
  }
  for (let [origExt, newExt] of Object.entries(extMapping).sort((a, b) => b[0].length - a[0].length)) {
    if (filepath.endsWith(origExt)) {
      return filepath.slice(0, -origExt.length) + newExt;
    }
  }
  return filepath;
}

Which is invalid JS, since the function has no name. v1.1.3 works great.