Expo - generate iOS buildNumber and Android versionCode from SemVer

versionForAppConfig.js

// version.json:
//
// {
//   "version": "3.0.23"
// }


let VERSION_JSON = `${PROJECT_CONFIG_DIR}/version.json`;
versionString = getVersionString(VERSION_JSON);

let {buildNumber, versionCode} = parseVersionString(versionString);

let appConfigJson = {
  .......
  version: buildNumber,
  .......
  ios: {
    buildNumber: buildNumber,
    ......
  },
  android: {
    versionCode: versionCode,
    ......
  },
  ......
 };


/**
 */
const getVersionString = (versionFilePath) => {
  try {
    if (!fs.existsSync(versionFilePath)) {
      die(`Cannot find version file: (${versionFilePath}) pwd(${__dirname})`);
    } else {
      let data = fs.readFileSync(versionFilePath, 'utf8');
      data = JSON.parse(data);
      let retVal = data?.version;
      if (retVal?.length < MIN_LENGTH_VERSION_STRING) {
        die(
          `Version string not valid: (${retVal}), ` +
            `data (${JSON.stringify(data)})`
        );
      }
      return retVal;
    }
  } catch (ex) {
    console.error(ex.message);
    throw ex;
  }
};


/**
 */
const parseVersionString = (versionString) => {
  let buildNum = versionString;
  let buildNumParts = buildNum.split('.');
  let versionCode =
    Number(buildNumParts[0] * 1000000) +
    Number(buildNumParts[1] * 1000) +
    Number(buildNumParts[2]);
  return {
    buildNumber: buildNum,
    versionCode: versionCode,
  };
};