Runs react-native run-ios to the current open simulator

run-current-sim.js

const child_process = require('child_process');

const runOnCurrentSim = () => {
  try {
    const simulators = JSON.parse(
      child_process.execFileSync(
        'xcrun',
        ['simctl', 'list', '--json', 'devices'],
        {encoding: 'utf8'},
      ),
    );

    const device = Object.keys(simulators.devices).reduce((obj, item) => {
      const deviceArr = simulators.devices[item].find(device => device.state === 'Booted' && device.availability === '(available)');
      if (deviceArr && deviceArr.length === 0 || typeof deviceArr === 'undefined') return obj;
      obj = deviceArr;
      return obj
    }, {});

    child_process.execSync(
      `react-native run-ios --simulator="${device.name || 'iPhone 6'}"`,
      { stdio: [0, 1, 2] }
    );
  } catch (e) {
    throw new Error(e);
  }
}

runOnCurrentSim();