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If your run script spawns multiple processes, make sure they’re in the same process group so they can be properly cleaned up by using concurrently or a similar tool: 
npm install --save-dev concurrently

{
    "scripts": {
        "run": "concurrently \"npm run server\" \"npm run worker\""
    }
}

​
Avoid & for backgrounding

If you use & to background a process, it will run in a separate process group. This can lead to “port already in use” and similar errors. For example: 
{
    "scripts": {
        "run": "npm run server & npm run worker"
    }
}
When Conductor stops the run script, only the worker will be terminated. The server will continue to run, holding ports, memory, and other resources.