Function updateTsConfig

scripts/update-test-tsconfig.js:37–45

(tsVersion, filename)

 * @param {string} filename
 */
const updateTsConfig = async (tsVersion, filename) => {
  const buffer = await fs.readFile(filename);
  const jsonString = buffer.toString("utf8");
  const json = JSON.parse(jsonString);

  applyRules(json, tsVersion);

  await fs.writeFile(filename, JSON.stringify(json, null, "  "));
};

const tsVersion = findTsVersion("yarn.lock");
if (tsVersion === undefined) {