text: import cp from 'child_process';
  
  const waitForProcess = async (process) => {
    return new Promise((resolve) => {
      let output = '';
      process.stdout.on('data', (chunk) => {
        output += chunk.toString();
      });
      process.on('close', () => {
        resolve(output);
      });
    });
  };
  
  it('Ensures that package do not include core-js dependency after build', async () => {
    // eslint-disable-next-line import/no-extraneous-dependencies
    const packageJSON = require('@linaria/babel/package.json');
    const buildScript = packageJSON.scripts['build:lib'];
  
    const proc = cp.exec(buildScript, {
      stdio: 'ignore',
      env: {
        ...process.env,
        DEBUG_CORE_JS: 'true',
      },
    });
    const result = await waitForProcess(proc);
    // run `DEBUG_CORE_JS=true yarn build:lib` to debug issues with introduced core-js dependency
    expect(result).not.toContain('Added following core-js polyfill');
    expect(result).toContain(
      'Based on your code and targets, core-js polyfills were not added'
    );
  }, 15000);
  