getLanguage.ts

const MAP_LANGUAGE = {
  yml: "yaml",
  Dockerfile: "docker",
  eslintrc: "json",
  js: "javascript",
  ts: "typescript",
  stylelintrc: "json",
  prettierrc: "json",
};

function getLanguage(inputLanguage: string | undefined) {
  if (inputLanguage === undefined) return "text";

  if (inputLanguage in MAP_LANGUAGE) {
    return MAP_LANGUAGE[inputLanguage as keyof typeof MAP_LANGUAGE];
  }

  return inputLanguage;
}