Function findTsVersion

scripts/find-ts-version.js:20–33

(filename)

 * @returns {string | undefined}
 */
const findTsVersion = (filename) => {
  try {
    const data = fs.readFileSync(filename, "utf8");
    const lines = data.split("\n").map((line) => line.trim());
    const typescriptLineIndex = lines.findIndex((line) => FIRST_TYPESCRIPT_LINE.test(line));
    const matched = lines[typescriptLineIndex + 1].match(TYPESCRIPT_VERSION_LINE);
    if (matched !== null) {
      return matched[1];
    }
    return undefined;
  } catch {
    return undefined;
  }
};

module.exports = { findTsVersion };