react/scripts/release/publish-commands/check-build-status.js

#!/usr/bin/env node

'use strict';

const chalk = require('chalk');
const {existsSync} = require('fs');
const {readJson} = require('fs-extra');
const {join} = require('path');

module.exports = async ({cwd, version}) => {
  const packagePath = join(cwd, 'build', 'packages', 'react', 'package.json');

  if (!existsSync(packagePath)) {
    throw Error('No build found');
  }

  const packageJson = await readJson(packagePath);

  if (packageJson.version !== version) {
    throw Error(
      chalk`Expected version {bold.white ${version}} but found {bold.white ${packageJson.version}}`
    );
  }
};