run_server.js

run_server.js

// Largely borrowed from https://github.com/kriasoft/react-starter-kit/blob/master/tools/runServer.js

import { spawn } from 'child_process';
import path from 'path';

class Server {
  constructor(script, options = { logger: console }) {
    this.script = script;
    this.logger = options.logger;
  }

  restart() {
    if (this.node) {
      this.logger.info(`${path.relative(process.cwd(), this.script)} restarting...`);
      this.node.kill();
    } else {
      this.logger.info(`${path.relative(process.cwd(), this.script)} starting...`);
    }

    this.node = spawn('node', [this.script], { stdio: 'inherit' });
    this.node.on('close', code => {
      if (code === 8) {
        this.logger.info('Error detected, waiting for changes...');
      }
    });

    process.on('exit', () => {
      if (this.node) {
        this.node.kill();
      }

      process.exit();
    });
  }
}

export default Server;