I was wondering what the code at the end of most deploy scripts does (the .then.... parts)

[ghost]

Hello, so I am not able to understand what this code does,

main()
    .then(() => process.exit(0))
    .catch((error) => {
        console.log(error)
        process.exit(1)
    })

I tried console logging process it logs a huge object, then i tried searching for exit turns out it's a function.

So my question is, what exactly does calling the exit function do and how did we even get that object in the first place..?

Thank you!

[Hamzakh777]

Hello,

The process is an object that's specific to the node.js runtime. You can find documentation about it here https://nodejs.org/api/process.html

main is a promise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise . then is called when the promise is settled while catch is called if an error happens.

Calling main makes sure that our deploy script actually runs. Once all our code finishes, we call process. exit(0) to close the runtime since nothing is left to execute. The 0 and 1 params we pass to exit are status codes https://stackoverflow.com/questions/43147330/what-is-difference-between-method-process-exit1-and-process-exit0-in-node-js

Hope that helps! Happy coding!

[ghost]

I understand, thank you so much for the answer!